U4090B-PFNG3Y

U4090B-P ATMEL | Alldatasheet

Document overview

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Technical content

Features

• DC Characteristic Adjustable  Transmit and Receive Gain Adjustable  Symmetrical Input of Microphone Amplifier  Anti-clipping in Transmit Direction  Automatic Line-loss Compensation  Symmetrical Output of Earpiece Amplifier  Built-in Ear Protection  DTMF and MUTE Input  Adjustable Sidetone Suppression Independent of Sending and Receiving Amplification  Speech Circuit with Two Sidetone Networks  Built-in Line Detection Circuit  Integrated Amplifier for Loud-hearing Operation  Anti-clipping for Loudspeaker Amplifier  Improved Acoustical Feedback Suppression  Power Down  Voice Switch  Tone Ringer Interface with DC/DC Converter  Zero Crossing Detection  Common Speaker for Loud-hearing and Tone Ringer  Supply Voltages for all Functional Blocks of a Subscriber Set  Integrated Transistor for Short-circuiting the Line Voltage  Answering Machine Interface  Operation Possible from 10 mA Line Currents  Filters against EMI on Critical I/O

Applications

 Feature Phone  Answering Machine  Fax Machine  Speaker Phone Benefits  Savings of One Piezoelectric Transducer  Complete System Integration of Analog Signal Processing on One Chip  Very Few External Components  Fewer Components for EMI Protection Monolithic Integrated Feature Phone Circuit EMI Improved U4090B-P Rev. 4741C–CORD–11/05

4741C–CORD–11/05 U4090B-P 1. Description The microcontroller-controlled telephone circuit U4090B-P is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with DC/DC converter, sidetone equivalent and ear protection rectifiers. The cir- cuit is line powered and contains all components necessary for amplification of signals and adaptation to the line. An integrated voice switch with loudspeaker amplifier allows loud-hearing or hands-free opera- tion. With an anti-feedback function, acoustical feedback during loud-hearing can be reduced significantly. The generated supply voltage is suitable for a wide range of peripheral circuits. Figure 1-1. Block Diagram MC with EEPROM/ DTMF Audio amplifier Speech circuit Voice switch Tone ringer Loudhearing and Tone ringing

4741C–CORD–11/05 U4090B-P Figure 1-2. Detailed Block Diagram GT MICO TXIN STO VL IMPSEL AGA IND SENSE GND PD LIDET RFDO THA RECINSTISSTILRACGRRECO2 RECO1MUTRMUTXGSA MIC1 MIC2 DTMF TTXA INLDR TLDR ATAFS SAO TSACL SAI MIC TX ACL Acoustical feedback suppression control Transmit mute control SACL Mute receive control Impedance control Power supply Current supply ISupplyLine detect AGA control Receive attenuation VMP ST BAL TXA INLDT TLDT 900Ω 2 6 11103 14 13 38 3736 3242 394140 43 DTMF RA1 RA2 SA SAI 600Ω VB VMP VMPS VM IREF VRING COSC SWOUT IL QS VL

4741C–CORD–11/05 U4090B-P 2. Pin Configuration Figure 2-1. Pinning SSO44 TXIN RECIN TTXA RECO1 RAC STIL STIS RECO2 MUTR STO IREF AGA TLDR TLDT INLDR INLDT ATAFS MUTX SAI GSA DTMF MICO MIC2 MIC1 PD IND GND SENSE SAO SWOUT COSC VRING THA RFDO LIDET IMPSEL TSACL U4090B-P GT VL VB VMPS GR VM VMP

4741C–CORD–11/05 U4090B-P Table 2-1. Pin Description Pin Symbol Function 1G T A resistor from this pin to GND sets the amplification of the microphone and DTMF signals, the input amplifier can be muted by applying VMP to GT

2 DTMF Input for DTMF signals, also used for the answering machine and hands-free input

3 MICO Output of microphone preamplifier

4 MIC2 Non-inverting input of microphone amplifier

5 MIC1 Inverting input of microphone amplifier

6P D Active high input for reducing the current consumption of the circuit, simultaneously V L is shorted by an internal switch 7I N D The internal equivalent inductance of the circuit is proportional to the value of the capacitor at this pin, a resistor connected to ground may be used to reduce the DC line voltage

8 VL Line voltage

9 GND Reference point for DC- and AC-output signals

10 SENSE

A small resistor (fixed) connected from this pin to V L sets the slope of the DC characteristic and also effects the line-length equalization characteristics and the line current at which the loudspeaker amplifier is switched on

11 VB Unregulated supply voltage for peripheral circuits (voice switch), limited to typically 7V

12 SAO Output of loudspeaker amplifier

13 VMPS Unregulated supply voltage for micorcontroller, limited to 6.3V 14 VMP Regulated supply voltage of 3.3V for peripheral circuits (especially microprocessors), minimum output current: 2 mA (ringing) 4 mA (speech mode)

15 SWOUT Output for driving external switching transistor

16 COSC 40-kHz oscillator for ringing power converter

17 VRING Input for ringing signal protected by internal Zener diode

18 THA Threshold adjustment for ringing frequency detector

19 RFDO Output of ringing frequency detector

20 LIDET Line detect; output is low when the line current is more than 15 mA

21 IMPSEL

Control input for selection of line impedance 1. 600Ω 2. 900Ω 3. Mute of second transmit stage (TXA); also used for indication of external supply (answering machine); last chosen impedance is stored

22 TSACL Time constant of anti-clipping of speaker amplifier

23 GSA Current input for setting the gain of the speaker amplifier, adjustment characteristic is logarithmical, or RGSA > 2 MΩ, the speaker amplifier is switched off

24 SA I Speaker amplifier input (for loudspeaker, tone ringer and hands-free use)

25 MUTX

Three-state input of transmit mute: 1. Speech condition; inputs MIC1/MIC2 active 2. DTMF condition; input DTMF active. A part of the input signal is passed to the receiving amplifier as a confidence signal during dialing 3. Input DTMF used for answering machine and hands-free use; receive branch not affected 26 ATAFS Attenuation of acoustical feedback suppression, maximum attenuation of AFS circuit is set by a resistor at this pin, without the resistor, AFS is switched off

27 INLDT Input of transmit level detector

28 INLDR Input of receive level detector

29 TLDT Time constant of transmit level detector

4741C–CORD–11/05 U4090B-P Note: Filters against electromagnetic interference (EMI) are locat ed at following pins: MIC1, MIC2, RECIN, TXIN, STIS, STIL and RAC. 3. DC Line Interface and Su pply-voltage Generation The DC line interface consists of an electron ic inductance and a dual-port output stage which charges the capacitors at VMPS and VB. The value of the equivalent inductance is given by: L = RSENSE × CIND × ((RDC × R30)/(RDC + R30)) In order to improve the supply during worst-case operating conditions, two PNP current sources - IBOPT and IMPSOPT - hand an extra amount of current to the supply voltages when the NPNs in parallel are unable to conduct current. A flowchart for the control of the current sources ( Figure 3-2 ) shows how a priority for supply VMPS is achieved.

30 TLDR Time constant of receive level detector

31 AGA Automatic gain adjustment with line current, a resistor connected from this pin to GND sets the starting point, maximum gain change: 6 dB.

32 IREF Internal reference current generation; RREF = 62 k Ω; IREF = 20 µA

33 STO

Output resistance approximate: 300Ω, Maximum load impedance: 10 kΩ.

34 VM Reference node for microphone-earphone and loudspeaker amplifier, supply for electret microphone

(IM ≤ 700 mA)

35 MUTR

1. Normal operation 2. Mute for ear piece 3. Mute for RECIN signal Condition of earpiece mute is stored

36 RECO2 Inverting output of receiving amplifier

37 STIS Input for sidetone network (short loop) or for answering machine

38 STIL Input for sidetone network (long loop)

39 RAC Input of receiving amplifier for AC coupling in feedback path

40 RECO1 Output of receiving amplifier

41 GR A resistor connected from this pin to GND sets the receiving amplification of the circuit; amplifier RA1 can be muted by applying VMP to GR

42 TTXA Time constant of ant i-clipping in transmit path

43 RECIN Input of receiving path; input impedance is typically 80 k Ω

44 TXIN Input of intermediate transmit stage, input resistance is typically 20 k Ω

Table 2-1. Pin Description (Continued) Pin Symbol Function

4741C–CORD–11/05 U4090B-P Figure 3-3. Supply of Functional Blocks Controlled by Input Voltages VL, VB, VRING and by Logic Inputs PD and IMPSEL The U4090B-P contains two identical series regulators which provide a supply voltage V MP of 3.3V suitable for a microprocessor. In s peech mode, both regulators are active because V MPS and VB are charged simultaneously by the DC-line interface. Output current is 4 mA. The capac- itor at V MPS is used to provide the microcomputer with sufficient power during long-line interruptions. Thus, long flash pulses can be bri dged or an LCD display can be turned on for more than 2 seconds after going on hook. When the system is in ringing mode, VB is charged by the on-chip ringing power converter. In this mode only one regulator is used to supply VMP with a maximum of 2 mA.

3.1 Supply Structure of the Chip

A major benefit of the chip is that it uses a very flexible supply structure which allows simple real- ization of numerous applications such as:  Group listening phone  Hands-free phone  Ringing with the built in speaker amplifier  Answering machine with external supply The special supply topology for the various functional blocks is illustrated in Figure 3-3. Power supply Voltage regulator Voltage regulator RFD TXA TXACL OFFSA COMP AFS IMPED CONTR QS PD LIDETLIDET RFDO ES IMPSEL VBRPC SAI,SA SACL MIC, DTMF AGA, RA1, RA2 TX MUTE MUT REC, STBAL RECATT 6.3V VMP VMPS VLON VL VRING

4741C–CORD–11/05 U4090B-P There are four major supply states: 1. Speech condition: In speech condition the system is supplied by the line current. If the LIDET -block detects a line voltage above the fixed threshold (1.9 V), the internal signal VLON is activated, thus switching off RFD and RPC and switching on all other blocks of the chip. At line voltages below 1.9V, the switches remain in their quiescent state as shown in Figure 3-4 on page 10. OFFSACOMP disables the group listening feature (SAI, SA, SACL, AFS) below line currents of approximately 10 mA. 2. Power down (pulse dialing): When the chip is in power-down mode (PD = high), e.g., during pulse dialing, the internal switch QS shorts the line and all amplifiers are switched off. In this condition, LIDET, voltage regulators and IMPED CONTR are the only active blocks. 3. Ringing: During ringing, the supply for the system is fed into V B via the ringing power converter (RPC). The only functional amplifiers are in the speaker amplifier section (SAI, SA, SACL). 4. External supply: In an answering machine, the chip is powered by an external supply via pin V B. This application allows the possibility to activate all amplifiers (except the transmit line interface TXA). Selecting IMPSEL = high impedance activates all switches at the ES line.

3.2 Acoustic Feedback Suppression

Acoustical feedback from the loudspeaker to t he handset microphone may cause instability in the system. The U4090B-P offers a very effici ent feedback suppression ci rcuit, which uses a modified voice switch topology. Figure 3-4 on page 10 shows the basic system configuration. Two attenuators (TX ATT and RX ATT) reduce the critical loop gain by introducing an externally adjustable amount of loss either in the transmit or in the receive path. The sliding control in block ATT CONTR determines, whether the TX or the RX signal has to be attenuated. The overall loop gain remains constant under all operating conditions. Selection of the active channel is made by co mparison of the logarithmically compressed TX- and RX- envelope curve. The system configuration for group listening, whic h is realized in the U4090B-P, is illustrated in Figure 3-6 on page 11 . TXA and SAI represent the two attenuators, the logarithmic envelope detectors are shown in a simplified way (operational amplifiers with two diodes).

4741C–CORD–11/05 U4090B-P Figure 3-7. Reducing Speaker Amplifier Gain Results in an Equal Reduction of AFS Attenuation Figure 3-8. Line Detection with Two Comparators for Speech Mode and Pulse Dialing

3.3 Line Detection (LIDET)

The line current supervision is active under all operating conditions of the U4090B-P. In speech mode (PD = inactive), the line-current comparator uses the same thresholds as the comparator for switching off the entire speaker amplif ier. The basic behavior is illustrated in Figure 3-9 on page 13. Actual values of ILON/ILOFF vary slightly with the adjustment of the DC characteristics and the selection of the internal line impedance. When Power Down is activated (during pulse dia ling), the entire line current flows through the short-circuiting transistor QS (see Figure 3-3 on page 8). As long as IL is above typically 1.6 mA, output LIDET is low. This comparator does not use hysteresis. ATAFS (dB) 36 dB ATAFSm ATAFSa GSAo GSAa GSA (dB) not usable RATAFS RATAFS IL PD LIDET

4741C–CORD–11/05 U4090B-P Figure 3-9. Line Detection in Speech Mode with Hysteresis

3.4 Ringing Power Converter (RPC)

The RPC transforms the input power at VRING (high voltage/low current) into an equivalent out- put power at V B (low voltage/high current) which is capable of driving the low-ohmic loudspeaker. Input impedance at VRING is fixed at 5 kΩ and the efficiency of the step-down con- verter is approximate 65%. Figure 3-10. Comparator Thresholds Depending on DC Mask and Line Impedance

3.5 Ringing Frequency Detector (RFD)

The U4090B-P offers an output signal for the microcontroller, which is a digital representation of the double ringing frequency. It is generated by a current comparator with hysteresis. The input voltage V RING is transformed into a current via RTHA. The thresholds are 8 µA and 24 µA. RFDO and VRING are in phase. A second comparator with hysteresis is used to enable the output RFDO as long as the supply voltage for the microprocessor VMP is above 2.0V. LIDET ILOFF ILON IL 10 12 14 16 18 VL (V) IL (mA) RDC = 68 kΩ RDC = 130 kΩ RDC = ∞ = ILON = ILOFF = ILON = ILOFF at line impedance = 600Ω at line impedance = 900Ω

4741C–CORD–11/05 U4090B-P 4. Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Parameters Symbol Value Unit Line current I L 140 mA DC line voltage V L 12 V Maximum input current, pin 17 I RING 15 mA Junction temperature T j 125 °C Ambient temperature T amb –25 to +75 °C Storage temperature T stg –55 to +150 °C Total power dissipation, Tamb = 60°C P tot 0.9 W 5. Thermal Resistance Parameters Symbol Value Unit Junction ambient SSO44 R thJA 70 K/W 6. Electrical Characteristics f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF , pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit DC Characteristics DC voltage drop over circuit I L = 2 mA IL = 14 mA IL = 60 mA IL = 100 mA VL 4.6 8.8 2.4 5.0 7.5 9.4 5.4 10.0 V Transmission Amplifier, IL = 14 mA, VMIC = 2 mV, RGT = 27 kΩ, Unless Otherwise Specified Range of transmit gain G T 40 45 50 dB Transmitting amplification RGT = 12 kΩ RGT = 27 kΩ GT 39.8 48 49 41.8 dB Frequency response IL ≥ 14 mA f = 300 to 3400 Hz ∆GT ±0.5 dB Gain change with current Pin 31 open IL = 14 to 100 mA ∆GT ±0.5 dB Gain deviation T amb = –10 to +60° C ∆GT ±0.5 dB CMRR of microphone amplifier CMRR 60 80 dB Input resistance of MIC amplifier RGT = 12 kΩ RGT = 27 kΩ Ri 45 75 110 kΩ Distortion at line IL > 14 mA VL = 700 mVrms dt 2% Maximum output voltage IL > 19 mA, d < 5% VMIC = 25 mV CTXA = 1 µF VLmax 1.8 3 4.2 dBm IMPSEL = open RGT = 12 kΩ VMICOmax –5.2 dBm

4741C–CORD–11/05 U4090B-P Noise at line psophometrically weighted IL > 14 mA GT = 48 dB no –80 –72 dBmp Anti-clipping attack time release time CTXA = 1 µF each 3 dB overdrive 0.5 9 ms Gain at low operating current IL = 10 mA IMP = 1 mA RDC = 68 kΩ VMIC = 1 mV IM = 300 µA GT 40 42.5 dB Distortion at low operating current IL = 10 mA IM = 300 µA IMP = 1 mA RDC = 68 kΩ VMIC = 10 mV dt 5% Line loss compensation IL = 100 mA RAGA = 20 kΩ ∆GTI –6.4 –5.8 –5.2 dB Mute suppression a) MIC muted (microphone preamplifier) b) TXA muted (second stage) IL ≥ 14 mA MUTX = open GTM 60 80 dB IMPSEL = open G TTX 60 dB Receiving Amplifier, IL = 14 mA, RGR = 62 kΩ, Unless Otherwise Specified, VGEN = 300 mV Adjustment range of receiving gain IL ≥ 14 mA, single ended differential MUTR = GND GR +8 dB Receiving amplification RGR = 62 kΩ differential RGR = 22 kΩ differential GR –1.75 –1 7.5 –0.25 dB Amplification of DTMF signal from DTMF IN to RECO 1, 2 IL ≥ 14 mA VMUTX = VMP GRM 71 0 1 3 d B Frequency response IL > 14 mA, f = 300 to 3400 Hz ∆GRF ±0.5 dB Gain change with current I L = 14 to 100 mA ∆GR ±0.5 dB Gain deviation T amb = –10 to +60°C ∆GR ±0.5 dB Ear-protection differential I L ≥ 14 mA, VGEN = 11 Vrms EP 2.2 V rms MUTE suppression a) RECATT b) RA2 c) DTMF operation IL ≥ 14 mA MUTR = open VMUTR = VMP VMUTX = VMP ∆GR 60 dB Output voltage d ≤ 2% differential I L = 14 mA, Zear = 68 nF + 100Ω 0.775 V rms Maximum output current d ≤ 2% Z ear = 100Ω 4 mA (peak) Receiving noise psophometrically weighted Zear = 68 nF + 100Ω IL ≥ 14 mA ni –80 –77 dBmp Output resistance Each output against GND R o 10 Ω Line loss compensation R AGA = 20 kΩ, IL = 100 mA ∆GRI –7.0 –6.0 –5.0 dB 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF , pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit

4741C–CORD–11/05 U4090B-P Gain at low operating current IL = 10 mA IMP = 1 mA IM = 300 µA VGEN = 560 mV RDC = 68 kΩ GR –2 –1 0 dB AC impedance VIMPSEL = GND VIMPSEL = VMP Zimp Zimp 570 840 600 900 640 960 Ω Ω Distortion at low operating current I L = 10 mA IMP = 1 mA VGEN = 560 mV RDC = 68 kΩ dR 5 % Speaker Amplifier Minimum line current for operation No AC signal I Lmin 15 mA Input resistance Pin 24 14 22 k Ω Gain from SAI to SAO VSAI = 3 mV IL = 15 mA RGSA = 560 kΩ RGSA = 20 kΩ GSA 35.5 36.5 37.5 dB Output power Load resistance RL = 50Ω, d < 5% VSAI = 20 mV IL = 15 mA IL = 20 mA PSA PSA mW Output noise (Input SAI open) psophometrically weighted IL > 15 mA n SA 200 µV psoph Gain deviation I L = 15 mA, Tamb = –10 to +60° C ∆GSA ±1 dB Mute suppression IL = 15 mA VL = 0 dBm VSAI = 4 mV Pin 23 open VSAO –60 dBm Gain change with current I L = 15 to 100 mA ∆GSA ±1 dB Resistor for turning off speaker amplifier IL = 15 to 100 mA RG SA 0.8 1.3 2 M Ω Gain change with frequency I L = 15 mA, f = 300 to 3400 Hz ∆GSA ±0.5 dB Attack time of anti-clipping 20 dB over drive tr 5 ms Release time of anti-clipping tf 80 ms DTMF Amplifier Test Conditions: IMP = 2 mA, IM = 0.3 mA, V MUTX = VMP Adjustment range of DTMF gain I L = 15 mA mute active G D 40 50 dB DTMF amplification IL = 15 mA VDTMF = 8 mV Mute active: MUTX = VMP GD 40.7 41.7 42.7 dB Gain deviation I L = 15 mA, Tamb = –10 to +60°C G D ±0.5 dB Input resistance RGT = 27 kΩ RGT = 15 kΩ Ri 180 300 130 kΩ Distortion of DTMF signal IL ≥ 15 mA VL = 0 dBm dD 2% 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF , pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit

4741C–CORD–11/05 U4090B-P Gain deviation with current I L = 15 to 100 mA ∆GD ±0.5 dB AFS Acoustic Feedback Suppression Adjustment range of attenuation I L ≥ 15 mA 0 50 dB Attenuation of transmit gain IL ≥ 15 mA IINLDT = 0 µA RATAFS = 30 kΩ IINLDR = 10 µA ∆GT 45 dB Attenuation of speaker amplifier IL ≥ 15 mA IINLDP = 0 µA RATAFS = 30 kΩ IINLDR = 10 µA ∆GSA 50 dB AFS disable I L ≥ 15 mA V ATAFS 1.5 V Supply Voltages, VMIC = 25 mV, Tamb = –10 to +60°C VMP IL = 14 mA RDC = 68 kΩ IMP = 2 mA VMP 3.1 3.3 3.5 V VMPS IL = 100 mA RDC = infinite IMP = 0 mA VMPS 6.7 V VM IL ≥ 14 mA IM = 700 µA RDC = 130 kΩ VM 1.3 3.3 V VB IB = 20 mA IL = 0 mA VB 77 . 6V Ringing Power Converter, IMP = 1 mA, IM = 0 Maximum output power V RING = 20.6V P SA 20 mW Threshold of ring frequency detector RFDO: low to high VHYST = VRINGON – VRINGOFF VRINGON VHYST 17.5 11.0 V Input impedance V RING = 30V R RING 456 k Ω Input impedance in speech mode f = 300 Hz to 3400 Hz IL > 15 mA VRING = 20V + 1.5Vrms RRINGSP 150 k Ω Logic level of frequency detector VRING = 0V VB = 4V VRING = 25V VRFDO VMP V Ring detector enable V RING = 25V, RFDO high V MPON 1.8 2.0 2.2 V Zener diode voltage I RING = 25 mA V RINGmax 30.8 33.3 V MUTR Input MUTR input current VMUTR = GND IL > 14 mA VMUTR = VMP IMUTE –20 +10 –30 µA MUTR input voltage Mute low; IL > 14 mA V MUTE 0.3 V Mute high; IL > 14 mA V MUTE VMP – 0.3V V 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF , pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit

4741C–CORD–11/05 U4090B-P PD Input PD input current PD active, I L > 14 mA VPD = VMP Ipd 9µ A Input voltage PD = active PD = inactive Vpd Vpd 0.3 V Voltage drop at VL IL = 14 mA, PD = active IL = 100 mA, PD = active VL 1.5 1.9 V Input Characteristics of IMPSEL Input current IL ≥ 14 mA VIMPSEL = VMP VIMPSEL = GND IIMPSEL IIMPSEL –18 µA µA Input voltage Input high V IMPSEL VMP – 0.3V V Input low V IMPSEL 0.3 V MUTX Input Input current VMUTX = VMP VMUTX = GND IMUTX IMUTX –20 –30 µA µA Input voltage Input high V MUTX VMP – 0.3V V Input low V MUTX 0.3 V Line Detection Line current for LIDET active PD = inactive ILON 12.6 mA Line current for LIDET inactive PD = inactive ILOFF 11.0 mA Current threshold during power down V B = 5V, PD = active ILONPD 0.8 1.6 2.4 mA 6. Electrical Characteristics (Continued) f = 1 kHz, 0 dBm = 775 mVrms, IM = 0.3 mA, IMP = 2 mA, RDC = 130 kΩ, Tamb = 25°C, RGSA = 560 kΩ, Zear = 68 nF + 100Ω, ZM = 68 nF , pin 31 open, VIMPSEL = GND, VMUTX = GND, VMUTR = GND, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit

4741C–CORD–11/05 U4090B-P 7. U4090B-P Control Table 7-1. Selection of TX Mute and Line Impedance Logic Level IMPSEL MODE Line impedance = 600Ω TXA = on ES = off Speech 0 to Z Line impedance = 600Ω TXA = off ES = on Transmit-mute 1 to Z Line impedance = 900Ω TXA = off ES = on Transmit-mute Line impedance = 900Ω TXA = on ES = off Speech Table 7-2. Selection of Earpiece Mute and Answering Machine Mode Logic Level MUTR MODE RA2 = on RECATT = on STIS + STIL = on Speech 0 to Z RA2 = on RECATT = off STIS = on, STIL = off For answering machine 1 to Z RA2 = off RECATT = off STIS = on, STIL = off AGA off for STIS For answering machine RA2 = off RECATT = on STIS + STIL = on Speech + earpeace mute Table 7-3. Selection of Transmit Mute Logic Level MUTX MODE MIC 1/2 transmit enabled receive enable AFS = on AGA = on TXACL = on Speech Z DTMF transmit enabled receive enable AFS = on AGA = on TXACL = on For answering machine DTMF transmit enabled DTMF to receive enable AFS = off AGA = off TXACL = off DTMF dialling

4741C–CORD–11/05 U4090B-P Figure 8-8. Basic Test Circuit U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 open Mico open open VMP 220 nF 150 nF VL VMP 47 nF 47 nF IM 3.3 nF 3.3 nF 2 MΩ RGR RGT 68 nF RDC 600Ω 4.7 nF IL BC556 2.2 mH SD103A DC VRING 68 nF 1 µF 10 µF RGSA VM Reference figure for not connected pins S1 = closed: speech mode S2 = closed: ringer mode ZEAR 10 µF 62 kΩ 100 µF VMP VM 3 kΩ 10 µF1 µF 1 kΩ 10 µF 22 µF 10Ω 47 µF 1000 µF 50Ω 220 µF 47 µF IDC IMP 680 kΩ VMVM 3 kΩ 36 kΩ 36 kΩ

4741C–CORD–11/05 U4090B-P Figure 8-9. Test Circuit for DC Characteristics and Line Detection U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Mico IM V 220 nF 150 nF RGR 100 µF RAGA 30 kΩ DC RGT 68 nF RDC 4.7 nF VB b a open 1000 µF 1 mFV RGSA Line detection: S1a VB (external supply): S1b Open pins should be connected as shown in Figure 8-14 ZEAR VLIDET 62 kΩ 10 µF VM VL 1 µF VMIC VMP 10 µF IL VL IB 220 µF 47 µF IMP

4741C–CORD–11/05 U4090B-P Figure 8-10. Test Circuit for Transmission Amplifier Input resistance: Ri = 50 k VL (S2 = closed) VL (S2 = open) - 1 Transmitting amplification GT = 20 × log VL Vmic Line loss compensation: ∆GTI = GT (at IL = 100 mA) - GT (at IL = 14 mA), S3 = closed Gain change with current: ∆GTI = GT (at IL = 100 mA) - GT (at IL = 14 mA) Common mode rejection ratio: CMRR = 20 log VCM VL + GT with S1b, S2 = closed, S3 = open Mute suppression: GTM = 20 × log VL (at MUTX = low) VL (at MUTX = open) GTTX = 20 × log VL (at IMPSEL = low) VL (at IMPSEL = open) Open pins should be connected as shown in Figure 8-14 U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Mico VL V 220 nF 150 nF RGR 10 µF 62 kΩ RAGA RGT 68 nF RDC IL 220 µF 1 µF open open VMP 4.7 nF 22 µF AC b a b a open 1 µF ZEAR RDC VL, dt, n o Vmic VCM VVMICO max VMP VM 1 µF IM 100 µF 25 kΩ 25 kΩ 600 22 µF 10Ω 1000 µF 47 µF IMP VMP

4741C–CORD–11/05 U4090B-P Figure 8-11. Test Circuit for Receiving Amplifier U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Mico V 220 nF 150 nF RGR 100 µF 62 k RAGA RGT 68 nF RDC 1 µF open open 220 nF V 4.7 nF V MP open ab AC Line loss compensation: ∆GRI = GR (at IL = 100 mA) - GR (at IL = 14 mA), S3 = closed Receiving noise: S1a Receive amplification: GR = 20 × log ( VZEAR/VLR) dB (S1 = b, S2 open) DTMF-control signal: GRM = 20 × log (VZEAR/VDTMF) dB (S1 =a, S2 = closed) AC-impedance: (VLR/(VGEN - VLR)) × ZL Mute suppression: a) RECATT: ∆GR = 20 × log (VLR/VZEAR) dB +GR, MUTR = open b) RA2: ∆GR = 20 × log (VLR/VZEAR) dB + GR, MUTR = VMP c) DT MF operation: ∆GR = 20 × log VLR/VZEAR) dB + GR, MUTX = VMP Open pins should be connected as shown in Figure 8-14 ZEAR VZEAR, dr V MP IM V MP V M 10 µF 1 µF V L V M 1 kΩ V DTMF 10 µF 600Ω 22 µF V GEN IL 220 µF 1000 µF V LR 47 µF I MP

4741C–CORD–11/05 U4090B-P Figure 8-12. Test Circuit for Speaker Amplifier U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Mico V MIC V 220 nF 150 nF RGR 10 µF RGSA 30 kΩ RGT 68 nF RDC 4.7 nF off S4VATAFS kΩ 220 nF V V 10 µFZEAR V SAI VSAO, S4 = closed VZIN, S4 = open nSA Input impedance: (VZIN/(VSAO - VZIN)) × RIN Gain from SAI to SAO: 20 × log (VSAO/VSAI) dB Output power: PSA = VSAO RSAO Attenuation of transmit gain: S1 = closed Open pins should be connected as shown in Figure 8-14 V IINLDTIINLDR 10 µF 62 kΩ V M 1 µF 1 µF V LIDET IMP 47 µF1000 µF 47 µF 220 µF 22 µF 50Ω 600Ω 10Ω IL 10 µF V L

4741C–CORD–11/05 U4090B-P Figure 8-13. Test Circuit for DTMF Amplifier U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Mico V L IM V 220 nF 150 nF RGR 100 µF 62 kΩ RGT 68 nF V M RDC IL 1 µF V MP 220 nF V 4.7 nF open AC ZEAR DTMF-amplifier: 20log (VL/VDTMF) dB Input resistance: (VL50K/(VL - VL50k)) × 50 kΩ Open pins should be connected as shown in Figure 8-14 VL: S3 = closed VL 50 kΩ: S3 = open dD 10 µF V M 1 µF V GEN3 50 kΩ 1 kΩ V DTMF 10 µF 10Ω 220 µF 1000 µF 47 µF IMP

4741C–CORD–11/05 U4090B-P Figure 8-14. Test Circuit for Ringing Power Converter 4) Input impedance in speech mode (IL > 15 mA): 1) Max. output power: 3) Input impedance: 2) Threshold of ringing frequency detector: detecting VRFDO, when driving VRING from 2V to 22V (VRINGON) and back again (VRINGOFF) (S2 = closed) 5) Ring detector enable: detecting VRFDO, when driving VMP from 0.7V to 3.3V (VMPON) and back again (VMPOFF) (S5, S3 = closed) Open pins should be connected as shown in Figure 8-14 U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 VSAI 100 µF 62 kΩ RGSA 68 nF RDC 4.7 nF 10Ω BC556 2.2 mH SD103A 68 nF 1 µF 680 kΩ V SAO 100 nF

1.8 Vpp

V V 1.5V 20V ramp 20.6V DC DC DC S1 S2 S3 S4 IRING V RFDO IRING V RING VRING 47 µF 47 µF 1000 µF 50Ω IMP VMP 220 µF IL 10 µF closed)4S( RSAO VsaoPSA closed)3S( IRING VRINGRRING == )closed1S( Iring VringRRINGSP ==

4741C–CORD–11/05 U4090B-P Figure 8-15. Test Circuit for Input Characteristics of I/O Ports U4090B-P 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 RGSA RGR RGT 68 nF RDC 4.7 nF 10Ω 1 µF V MP V LV 62 kΩZEAR Open pins should be connected as shown in Figure 8-14 open IMUTX VMP IIMPSEL IMP 47 µF 1000 µF 220 µF10 µF IL Ipd VMP Vpd 10 µF VM IMUTR VMP 100 µF IM

4741C–CORD–11/05 U4090B-P Figure 8-16. Application Circuit for Loud-hearing to ST 1 3 44 33 21 31 7 108 11 14 13 12V to µC 32 R5 L 1 Micro- phone DTMF Generator RECO MICO 23 25 35 36 40 41 39 38 37 ST STN 2 (Option) Micro controller U4090B-P Tip Ring hook switch Earpeace Loud- speaker C 9Q 9 R 7 VM C 7 C5C4 R4R3 C2C1R 1 M R 28 R 27 R 20 R 19 C 21 C 22 C 20 C 19 C 18 C 17 R 31 C16 C15 C14R17 R16 VM R15 R14 R13 R12 R 11 V M V M C 12 C 13 C 11 R 9 R 10 R 8 C 10 V L V MP

4741C–CORD–11/05 U4090B-P Figure 8-17. Application for Hands-free Operation to ST 1 3 44 33 21 31 7 108 11 14 13 12V to µC C 7 hook switch Micro- phone DTMF RECO LOGTX 23 25 35 36 40 41 39 38 37 STN 2 (Option) VM Microcontroller U4090B-P Tip Ring BC177 ST LOGTX Loud speaker Earpiece HF-Mic R 5 C 9Q 1 V MP R 6 VM C 8 C 6C 5 C 4 R 4 C 3 R 3 C 2 C 1 R 1 V M R 26 C25 R 25 R 24 C24 R 22 R 23 C 23 C 21 R 30 R 29 C 27 C 26 C 18 C 17 R 18 C 16 C 15 C 14 R 17 R 16 R 15 R 14 R 13 R 12 R 11 V M V M C 12 C 13 C 11 R 10 R 9 R 8 C 10 V L V B R21

4741C–CORD–11/05 U4090B-P Table 8-1. Typical Values of External Components (Figure 8-16 on page 31 and Figure 8-17 on page 32) Name Value Name Value Name Value Name Value C1 100 nF C 16 47 µF R 3 > 68 kΩ R18 30 kΩ C2 4.7 nF C 17 10 µF R 4 10 kΩ R19 6.8 kΩ C3 10 µF C 18 10 µF R 5 1.5 kΩ R20 6.8 kΩ C4 220 µF C 19 68 nF R 6 62 kΩ R21 15 kΩ C5 47 µF C 20 68 nF R 7 680 kΩ R22 330 kΩ C6 470 µF C 21 1 µF R 8 22 kΩ R23 220 kΩ C7 820 nF C 22 100 nF R 9 330 kΩ R24 68 kΩ C8 100 µF C 23 6.8 nF R 10 3 kΩ R25 2 kΩ C9 100 nF C 24 10 nF R 11 62 kΩ R26 3.3 kΩ C10 150 nF C 25 100 nF R 12 30 kΩ R27 18 kΩ C11 86 nF C 26 470 nF R 13 62 kΩ R28 2 kΩ C12 33 nF C 27 33 nF R 14 120 kΩ R29 1 kΩ C13 10 µF L 1 2.2 mH R 15 47 kΩ R30 12 kΩ C14 100 nF R 1 27 kΩ R16 1 kΩ R31 56 kΩ C15 1 µF R 2 20 kΩ R17 1.2 kΩ

4741C–CORD–11/05 U4090B-P 10. Package Information 9. Ordering Information Extended Type Number Package Remarks U4090B-PFNY SSO44 Pb-free U4090B-PFNG3Y SSO44 Taped and reeled, Pb-free T4090B-PC Die Chip on foil technical drawings according to DIN specifications Dimensions in mm 0.25 0.10 0.3 0.8 18.05 17.80 16.8 2.35 9.15 8.65 7.50 7.30 10.50 10.20 0.25 44 23 1 22

Printed on recycled paper. 4741C–CORD–11/05 © Atmel Corporation 2005 . All rights reserved. Atmel ®, logo and combinations thereof, Everywhere Y ou Are ® and others, are registered trade- marks or trademarks of Atmel Corporation or its subsidiari es. Other terms and product names may be trademarks of others. Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL ’S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL ’S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTOR Y WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICU LAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR I NCIDEN- TAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF AT MEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the ri ght to make changes to specifications and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained her ein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel’s products are not int ended, authorized, or warranted for use as components in applications intended to support or sustain life. Atmel Corporation Atmel Operations

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