U3761MB-T ATMEL | Alldatasheet
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Technical content
Features
Adjustable DC Characteristic Symmetrical Input of Microphone Amplifier Receiving Amplifier for Dynamic or Piezo-electric Earpieces Automatic Line-loss Compensation Dialer DTMF/Pulse Switchable Pulse Dialing 66/33 or 60/40 or DTMF Dialing Selectable by Pin Selectable Flashing Duration by Key Pad Pause Function Optical Indication of Temporary DTMF Mode Keytone for Pulse Dialing Last Number Redial up to 32 Digits Three by 17 Digits Direct (One-touch) Memory Ten by 17 Digits Indirect (Two-touch) Memory Notice Function up to 32 Digits Standard Low-cost Crystal 3.58 MHz or Ceramic Resonator Handset Mute (Privacy) with Optical Indication Additional Toggle Flipflop Internal Loop Interrupt Detection Tone Ringer 2-tone Ringer Adjustable Volume RC Oscillator Adjustable Threshold Benefits Low Number of External Components High Quality through One IC Solution Electrostatic sensitive device. Observe precautions for handling.
Description
Atmel’s low-voltage telephone circuit U3761MB-T performs all the speech and line interface functions required in an electronic telephone set, a tone ringer, a pulse and DTMF dialing with redial, notice function, and 13 memories. Operation below 15 mA is possible with reduced performance. Universal Telephone IC - All Functions Integrated U3761MB-T
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Figure 1. Block Diagram
4.7 VVI
Figure 2. Pinning SSO44
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4744A–CORD–09/03 Pin Description Pin Symbol Function Configuration 1C 1 Keyboard input 2C 2 3C 3 4C 4
5 Earth Earth key (604 ms high pulse, 1 s pause)
Input with 200 k/g87 pull-down resistor HFI triggers HFO with each LOW/HIGH edge
7 HFO Output will be toggled by each LOW/HIGH edge at HFI
PD = Protection Device VDD EARTH PD HFI VDD VDD PD 200K HFO VDD PD
4744A–CORD–09/03 XT XT A built-in inverter provides oscillation with an inexpensive 3.579545-MHz crystal or ceramic resonator
10 MFO
Specified (Hz) Actual (Hz) Error (%) R1 697 699 +0.28 R2 770 766 -0.52 R3 852 848 -0.47 R4 941 940 -0.10 C1 1209 1216 +0.57 C2 1336 1332 -0.30 C3 1477 1472 -0.34
11 MFIND
During the temporary DTMF mode the output switches to low Reset by on hook condition Maximum voltage at MFIND = 5.5 V
12 GND Ground
Inverting input of microphone amplifier Non-inverting input of microphone amplifier Pin Description Pin Symbol Function Configuration XT VDD VDD VDD VDD XT PD PD MFO VDD VDD PD VDD MFIND PD MFIND MIC2 VI VI MIC1 PD PD 1 V 1 V 50K 50K
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15 MICO Transmit pre-amp output which is normally capacitively
16 VL Positive supply voltage input to the device. The current through this pin is modulated by the transmit signal.
17 RDC
An external resistor (1 W) is required from this pin to GND to control the DC input impedance of the circuit. It has a nominal value of 39 /g87 for low-voltage operation. Values up to 100 /g87 may be used to increase the available transmit output voltage swing at the expense of low-voltage operation. 18 TIN Input to the line output driver amplifier. T ransmit AGC applied to this stage. 19 V I This internal voltage bias line must be connected to VL via an external resistor which dominates the AC input impedance of the circuit and should be 680 /g87 for an 600-/g87 input impedance or 1.2 k/g87 for a 900-/g87 input impedance. Pin Description Pin Symbol Function Configuration VI 1 V MICO PD 16K VL RDC PD PD 16 V RDC AGC VL PD PD 1 V TIN PD 5.6K 16 V VI PD 16 V
4744A–CORD–09/03
20 MUTE
Forcing MUTE to GND mutes the microphone and decreases the earpiece signal by typically 29 dB; no pull up circuit allowed
21 PRIND
Open collector with minimum 1 mA drive current to GND when PRIVACY = active 22 RECIN Receive amplifier input. The receiving amplification is regulated by an AGC. RECO2 RECO1 Output of the receive amplifier. Dynamic transducers with a minimum impedance of 100 /g87 can be directly driven by these outputs.
25 CLIM
Time constant of anticlipping in transmit path. CLIM /g179 2.2 µF CLIM = GND: anticlipping inactive 26 ST The output of the sidetone cancellation signal, which requires a balanced impedance of 8 to 10 times the subscriber’s line impedance to be connected to pin VL. Pin Description Pin Symbol Function Configuration VBG MUTE PD MUTE 6.7 V 30K PRIND VL PD 6.7V RECIN 60K RECO1 RECO2 1 V VL PD 60K 6.7 V VL CLIM IDC PD 6 V ST PD 16 V
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27 THA Ringer threshold adjustment
28 AGC
The range of transmit and receive gain variations between short and long loops may be adjusted by connecting a resistor RAGC from this pin to (GND). This pin can be left open to set AGC out of action.
29 VRIAC Ringing supply
30 VRING DC supply voltage for the tone ringer is limited to 30 V with
integrated Z-diode.
31 RCK RC clock oscillator for ringer
Pin Symbol Function Configuration THA VRIAC 1 V PD 6 V 6 V 12K 20K 140K RDC AGC VL PD PD VRIAC PD 50 V 70K 10K OUT VRING PD PD 30 V 50 V 200 6.5K 3.4 V 0.8 V RCK PD 6 V 6 V
4744A–CORD–09/03
32 OUT Buzzer output
33 VDD Supply output for dialer part
34 Test Test input with 6.25 k /g87 pull-up resistor
35 NC Not connected
36 HKS
HKS = 0: On-hook state. Chip in sleep mode, no operation (external pull-down resistor recommended) HKS = 1: Off-hook state. Chip enable for normal operation I HKS /g163 0.5 mA 37 KT Keytone output signal which is sent out in pulse dialing mode with a keytone frequency of 582 Hz. KT sink/drive current is about 100 µA at V DD = 2.5 V Pin Description Pin Symbol Function Configuration OUT VRING PD PD 30 V 50 V 200 6.5K VL VDD PD 6 V 6 V VDD VDD VDD TEST PD 6.25 k HKS VDD PD KT VDD VDD PD
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38 MODE
Pulling MODE pin to: C3: tone mode with 87 ms burst time and 140 ms pause C4: tone mode with 87 ms DTMF burst and 87 ms pause R1: pulse mode with 20 pps, Make/Break = 40/60 R2: pulse mode with 20 pps, Make/Break = 33/66 R3: pulse mode with 10 pps, Make/Break = 40/60 R4: pulse mode with 10 pps, Make/Break = 33/66 C1: pulse mode with 10 pps, Make/Break = 33/66 and temp. DTMF with 87 ms DTMF burst, 140 ms pause MODE pin pulled to R4: with temporary DTMF , 87 ms DTMF burst and 87 ms pause 39 DP Pulse dialing output. Flash key will cause DP to be active in either DTMF mode or pulse mode. In on-hook state is DP = VDD
40 Mask
Short mute during pulse dialing, active high During MASK an internal NPN transistor shortens VL against VI. 41 R1 Keyboard input 42 R2 43 R3 44 R4 Pin Description Pin Symbol Function Configuration VDD VDD MODE PD DP VDD PD MASK VDD PD VDD VDD VDD VDD R2-R4 PD PD
4744A–CORD–09/03 S: Store function key A: Indirect repertory dialing function key (LN 0 to 9) R/P: Redial and pause function key N: Notice function */T: * function; pulse-to-tone function M1 to M3: One-touch memory F1, F2, F3: Flash keys Normal Dialing OFF HOOK , D1 D2 , ..., Dn 2. Dialing length is unlimited, but redial is inhibited if length oversteps 32 digits. 3. If redialing length oversteps 32 digits, the redialing function will be inhibited. Redialing OFF HOOK , D1 , D2 , ..., Dn BUSY, Come ON HOOK ,OFF HOOK , R/P The R/P key can execute the redial function only as the first key-in after off-hook; otherwise, it executes the pause function (3.6 s). Keys stored in redial memory: 0 to 9, #, R/P, A, M1, M2, M3, N, * (only tone mode) Characters F1, F2, F3, Earth, (* in pulse mode) can only be stored in Mn, Ln and N memory. Characters F1, F2, F3, Earth, (* in pulse mode) will not be dialled out from redial memory; dialling out was stopped, when recognizing one of the above characters. Example: OFF/ HOOK, D1, D2, F1, D4, D5, S, S, M1 a) ON/OFF-HOOK, R/P only D1, D2 will be dialed out, then dialing out stops b) ON/OFF-HOOK, M1 D1, D2, F1, D4, D5 will be dialed out Content of redial memory can be copied to Mn, Ln, N; but copying memory Mn, Ln, N to itself or to another memory (except redial memory) will erase the destinated memory. Keyboard Operation C1 C2 C3 C4 1 2 3 S M1 R1 4 5 6 M2 R2 7 8 9 A M3 R3 */T 0 # R/P N R4 /g94 ← F1 F2 F3 E /g94
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4744A–CORD–09/03 Example: OFF/ HOOK, D1, D2, ... Dn a) ON/OFF-HOOK, R/P, N. D1, ... Dn copied to N b) ON/OFF-HOOK, R/P, S, S, Mn (or Ln) D1, ... Dn copied to Mn (or Ln) but OFF/ HOOK, M1 content of M1 will be dialed out a) ON/OFF-HOOK, R/P, S, S, M2 not possible, M2 will be erased b) ON/OFF-HOOK, M1, S, S, M2 not possible, M2 will be erased Number Store OFF HOOK , D1 , D2 , ..., Dn , S , S , Mn (or Ln) 1. D1, D2, ..., Dn will be stored in memory location only (not in redial memory) and dialed out. OFF HOOK S , D1 , D2 , ..., Dn , S , Mn (or Ln) 3. R/P and */T keys can be stored as a digit in memory, also F1, F2, F3, Earth. In store mode, R/P is the pause function key; */T is the pulse-to-tone function key. 4. The store mode is released after the store function is executed or when the state of the hook switch is changed. 5. Number store can be linked without going ON/OFF-Hook Example: Repertory Dialing 1. OFF HOOK , Mn 2. OFF HOOK , A , Ln Notice (N) OFF HOOK D1 , D2 , ..., Dn , N 1. If the dialing of D1 to Dn is finished, pressing the N key will cause D1 to Dn to be copied to the N memory. 2. Pressing key N again, after D1, D2, ... Dn was copied to N, N will be dialed out again OFF HOOK , N 3. D1 to Dn will be dialed out after the N key is pressed. 4. Notice function is valid as first key only. Cascaded Dialing 1. Normal dialing + Repertory dialing + Normal dialing 2. Repertory dialing + Normal dialing + Normal dialing 3. Redialing + Normal dialing + Repertory dialing 4. Redialing is valid as first key-in only.
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Figure 5. Pulse Mode Auto Dialing, t > tOHD Figure 6. DTMF Mode Normal Dialing
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Figure 9. Pause Function
- If the mode switch is set to pulse mode, then the output signal will be:
- If the mode switch is set to tone mode, then the output signal will be:
- The dialer remains in tone mode when the digits have been dialed out and can
be reset to pulse mode by going on-hook only.
- ON/OFF-HOOK, R/P D1, D2, Dn dialed out, then further dialing out stops and
remains in pulse mode, when dialling from redial memory.
- If characters are stored in Mn, Ln or N, dialing out will be the same in pulse mode
2 R/P 3
Figure 10. Pulse-to-tone Operation
- The dialer will execute a flash break and the entire flash pause time will elapse
before the next digits are dialed out.
- The flash key can be stored as a digit in the memory. Only one flash, however,
will be released to the users.
- The system will return to the initial state after the flash pause time has elapsed.
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Figure 11. Flash Operation Figure 12. Symbolic Timing Diagram: Earth Function
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4744A–CORD–09/03 Note: ESD withstand voltage 1 kV according to ESD standard S5.1 (HBM) 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 IL 140 mA DC line voltage VL 14 V DC voltage at pins 1 to 11 and 33 to 44 VDC 5.5 V Junction temperature Tj 125 /g176C Ambient temperature Tamb -25 to +75 /g176C Storage temperature Tstg -55 to +150 /g176C Total power dissipation, Tamb = 60/g176C, SSO44 Ptot 0.9 W Junction ambient, SSO44 RthJA 70 K/W Electrical Characteristics: Speech Circuit Reference point pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39 /g87/1 W, Tamb = 25°C, unless otherwise specified, refer to "Basic Test Circuit". CLIM = GND Parameters Test Conditions Symbol Min. Typ. Max. Unit Line voltage IL = 8 mA IL = 20 mA IL = 73 mA IL = 100 mA VL 3.6 5.9 6.9 1.4 3.85 6.55 4.1 7.2 8.2 V V V V Transmit and Sidetone Input resistance R i Ri 45 80 120 k /g87 Gain I L = 20 mA, S5 = open G s 46.8 47.8 48.8 dB Gain change with current I L = 20 to 60 mA, RAGC = infinite /g68GS -0.5 0.5 dB Gain deviation T amb = -10 to +60/g176C, IL = 20 mA /g68GS -0.5 0.5 dB Line-loss compensation R AGC = 12 k/g87, IL = 73 mA /g68Gs -7 -6 -4.8 dB Distortion at line VL = 0.775 Vrms IL = 20 mA, S5 = open d t 2% Maximum output voltage at line d /g163 5% IL = 20 mA, Vmic = 10 mV , CLIM = 2.2 µF , S1 = open VLmax 1.2 dBm Attack time transmit anticlipping CLIM = 2.2 µF t att 3.5 ms Noise at line weighted psophometrically IL > 20 mA, GS = 48 dB n o -72 dBmp Sidetone reduction I L /g179 20 mA G ST A 10 15 20 dB DTMF Amplifier Volume range d < 5% Single tone, I L /g179 20 mA V L 1.3 dBm DTMF output level low frequency group IL = 20 mA, S5 = closed Tamb = -5/g176C to +60/g176C VL -7.6 -4.6 dBm Pre-emphasis between high- and low-level frequency group PPRE = PHLG - PLLG, S5 = closed, Tamb = -5/g176C to +60/g176C PPRE 1.9 2.5 3.1 dB Total harmonic distortion relative to sum level of low and high frequency group signal IL /g179 20 mA, measured at pin MFO THD -33 -25 dBr
4744A–CORD–09/03 Receiving Amplifier Gain I L /g179 20 mA G R 35 d B Gain change with current IL = 20 to 60 mA RAGC = infinite /g68GR -0.5 0.5 dB Gain deviation Tamb = -10 to +60/g176C IL = 20 mA /g68GR -0.3 0.7 dB Line-loss compensation I L = 73 mA DG R -7 -6 -4.7 dB Receiving noise at earphone weighted psophometrially IL = 73 mA n i -77.5 -71 dBm Gain change when muted I L /g179 20 mA G RM 24 29 34 dB Output voltage push-pull IL /g179 20 mA, Zear = 68 nF , 100/g87 in series, d /g163 2% VRECO 0.8 0.9 V rms Ear protection differential IL = 40 mA, Vgen = 4 Vrms, Zear = 68 nF + 100 /g87 Vear 1.3 1.6 2.5 V rms Supply Voltage (For Internal Use Only) Output voltage Note: Output must be limited externally to 5.5 V maximum IL /g179 20 mA dialing mode V DD 2.0 6.3 V Available current for peripherals I L /g179 20 mA dialing mode I DD 150 µA Transmit Maximum output voltage swing at line I L = 20 mA, VMIC =5 0m Vrms VLm a x 3.4 4 Vpp Mute suppression transmit with privacy function IL = 20 mA G SPRIV 60 dB Electrical Characteristics: Speech Circuit (Continued) Reference point pin GND, f = 1000 Hz, 0 dBm = 775 mVrms, RDC = 39 /g87/1 W, Tamb = 25°C, unless otherwise specified, refer to "Basic Test Circuit". CLIM = GND Parameters Test Conditions Symbol Min. Typ. Max. Unit DC Characteristics Dialer VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameters Test Conditions Symbol Min. Typ. Max. Unit Memory retention current HKS = 0, V DD = 1.0 V I MR 0.1 µA Data retention voltage 0.5 V DTMF distortion R L = 5 k/g87 d- 3 0 - 2 3 d B DP output sink current V PO = 0.5 V I PL 0.5 mA Keyboard input drive current V I = 0 V I KD 20 µA Keyboard input sink current V I = 2.7 V I KS 500 µA Key on resistance R KON 5k /g87 Key off resistance R KOFF 100 k /g87 Mask sink/drive current I M H/L 0.5 mA Earth sink/drive current I e H/L 0.5 mA
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4744A–CORD–09/03 Isolation resistance XT/XT Riso 4.7 M /g87 Maximum voltage at HKS 5.5 V Maximum input current at HKS 0.5 mA DC Characteristics Dialer (Continued) VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameters Test Conditions Symbol Min. Typ. Max. Unit AC Characteristics Dialer VDD = 2.7 V, fOSC = 3.58 MHz, all outputs unloaded, S9 closed; HKS = 1 Parameters Test Conditions Symbol Min. Typ. Max. Unit Keypad active in debounce mode t KID 15 20 25 ms Key release debounce t KRD 15 20 25 ms Pre-digit pause MODE pin = R3 (10 pps) MODE pin = C1, C4 (10 pps) tPDP tPDP 33.3 33.5 ms ms MODE pin = R1 (20 pps) MODE pin = R2 tPDP tPDP 16.65 ms ms Inter-digit pause (auto dialing) 10 pps, tIP = tIDP + tPDP 20 pps tIP tIP 810 836 512 860 ms ms Make/break ratio MODE pin = R1 (20 pps), R3 10 pps) MODE pin = C1, R4 (10 pps) R2 (20 pps) M/B 40.8:60.2 35.6:64.4 40:60 33:67 39.2:60.8 31.2:68.8 DTMF output duration Auto dialing, MODE = C4 MODE = C3 tTD 90 ms Inter-tone pause Auto dialing, MODE = C4 MODE = C3 tITP 135 140 147 ms Flash break time C 1 connected to GND C2 connected to GND C3 connected to GND tFB 245 590 250 604 101 255 610 ms ms ms Rise time of leading edge at HKS 20 to 70% of VDD t rHKS 10 ms Flash pause time F1, F2, F3 t FP 0 . 911 . 1s Pause time tP 3.5 3.6 3.7 s On-hook debounce time t ohd 145 165 185 ms Earth time C 4 connected to GND t et 604 ms Earth pause time t pt 0 . 911 . 1s Break duration MODE pin = R3 MODE pin = C1, R4 tB 57.6 66.7 62.4 ms ms MODE pin = R1 (20 pps) MODE pin = R2 tB 33.35 ms ms Make duration MODE pin = R3 MODE pin = C1, R4 tM 33.3 ms ms MODE pin = R1 (20 pps) MODE pin = R2 tM 20 16.65 ms ms Break + make duration MODE pin = C1, R3, R4 tP 95 100 105 ms MODE pin = R1, R2 (20 pps) tP 50 ms
Figure 16. Turn-off Delay Time Note The oscillator frequency is defined by R and C at pin RCK.
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Figure 17. Basic Test Circuit
4744A–CORD–09/03 Equations for Electrical Characteristic Parameters of the Speech Circuit The equations refer to the basic test circuit. If not otherwise specified, the switches in the basic test circuit are inactive. Transmit Gain VMIC = 3 mV/1 kHz, S5 = open Line-loss Compensation Transmit /g68GS = GS (at IL = 73 mA) - GS (at IL = 20 mA) TX-mode: VMIC = 3 mV/1 kHz, S5 = open Line-loss Compensation Receive /g68GR = GR (at IL = 73 mA) - GR (at IL = 20 mA) RX-mode: Vgen = 300 mV/1 kHz, S7b Receiving Gain RX-mode: Vgen = 300 mV/1 kHz, S7b Sidetone Reduction (in TX-mode) + GR TX-mode: VMIC = 3 mV/1 kHz, S5 = open Input Impedance of Microphone Amplifier TX-mode: VMIC = 3 mV/1 kHz, S5 = open Gain Change when Muted (Mute = inactive) - (Mute = active) Vgen = 100 mV/1 kHz, S5 = open, S8 = open Total Harmonic Distortion (THD) n1, ... nn = harmonics of high and low frequency group GS 20 log VL VMIC /g230/g246/g180= GR 20 log VRECO VL /g230/g246/g180= GSTA 20 log VL VRECO /g230/g246/g180= Ri 50 k VL(S6 = closed) VL(S6 = open) /g230/g246 GRM 20 log VRECO VL /g230/g246/g180= 20 log VRECO VL /g230/g246/g180 THD 20 log n1 ULG 2 n1 UHG 2 n2 ULG 2 n2 UHG 2 ...nn ULG 2 nn UHG ULG
2 UHG
/g232 /g248 /g231 /g247 /g231 /g247 /g230 /g246 /g180=
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Package Information
Ordering Information
Extended Type Number Package Remarks U3761MB-TFN SSO44 Tube U3761MB-TFNG3 SSO44 Taped and reeled 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
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