U4080B

U4080B TEMIC | Alldatasheet

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Technical content

Features

/C0068Operates on telephone lines, integrated reference voltage regulation /C0068Output power: 100 mW at a 25-Ω load with peak limitation /C0068Chip select pin for active/standby operation /C0068Linear volume control /C0068Monitoring system for background sound level /C0068Wide operating dynamic range through signal compression Block Diagram / Application Circuit Figure 1. Block diagram and application circuit

Rev. A1, 20-May-96 Preliminary Information 2 (15) Pin Description Pin Symbol Function 1 R1 Load resistance. Provides reference current for the transmit and receive attenuators.

2 RTG Transmit attenuator nominal gain

resistor. Transmit channel gain is inversely proportional to the resistance RTG connected to Pin 2. 3 TI Transmit attenuator input. Input resistance is 5 kΩ 4 TO Transmit attenuator output. Drives the input of the transmit level detector and the external circuit which drives the telephone line. 5 TLI Transmit level detector input. Sets the detector level. Sensitivity to transmit channel signals increases when the value of the resistor decreases. 6 TLO Transmit level detector output. The external RC-element sets the time the comparator will hold the system in the transmit mode after speech ceases. 7 RLI Receive level detector input. An external resistance connected to the pin sets the detection level. Sensitivity to receive channel signals increases when the resistor decreases. 8 RLO Receive level detector output. RC-element connected at the pin sets the time the comparator will hold the system in the receive mode after the receive signal expires. 9 MIC Microphone amplifier input. Input impedance is 10 kΩ and the bias voltage is approximately equal to V 10 MICO Microphone amplifier output. Gain is set internally at 34 dB (50 V/V).

11 CP1 RC circuit for holding background

noise level. The transmit detector compares the CP1 voltage with the speech signal from CP2.

12 CP2 Capacitor for detecting the speech

signal for comparison with the background noise held at Pin 11 (CP1). 13 TDI Transmit detector input. The microphone amplifier output is coupled to the TDI pin through an external resistor. Pin Symbol Function

14 GND1 High current ground pin for the speaker

amplifier output stage. GND1 voltage should be within 10 mV of the ground voltage of Pin 22. 15 SAO Speaker amplifier output. It will source and sink up to 100 mA when ac coupled to the speaker. Gain is set internally at 34 dB (50 V/V). 16 V+ DC supply.

17 AGC A capacitor from this pin to VB

stabilizes the speaker amplifier gain control loop, and additionally controls the attack and decay time of this circuit. The gain control loop limits the speaker amp input to prevent clipping at SAO. The internal resistance at the AGC pin is nominally 110 kΩ . 18 CS Digital chip select input. Logic O: VCC regulator is enabled when /C0120 0.7 V; Logic 1: Standby mode drawing 0.5 mA when /C0121 1.6 V 19 SAI Speaker amplifier input. Input impedance is ca. 20 kΩ . 20 VCC Regulated output voltage (5.4 V). It powers all circuits except the speaker amplifier output. This voltage can be used for an external circuit i.e., a microprocessor where a filter capacitor is required. 21 V B Output voltage. V B is approximately VCC/2 and serves as an analog ground to the speaker- phone system.

22 GND2 Integrated circuit ground

(except for the speaker amplifier). 23 TDO Transmit detector output. An external RC circuit holds the system in the transmit mode during pauses between words or phrases. 24 VCI V olume control input. A variable resistor connected to this pin provides receive mode volume control. 25 ACF Attenuator control filter. A connected capacitor reduces noise transients as the attenuator control switches levels of attenuation.

Rev. A1, 20-May-96 3 (15) Pin Symbol Function 26 RECO Receive output attenuator. This pin is normally ac coupled to the input of the speaker amplifier (Pin 19 – SAI) 27 RECI Receive input attenuator. Input resistance is nominally 5 kΩ .

28 RG Resistor connected from Pin 28 to

ground determines the nominal gain of the receive attenuator. The receive channel gain is directly proportional to the RG resistance. Absolute Maximum Ratings Reference point Pin 22, Tamb = 25°C, unless otherwise specified Parameters Symbol Value Unit Supply voltage Pin 16 V+ 14 V Digital chip select input voltage Pin 18 V 18 14 V Speaker amplifier ground voltage Pin 14 V 14 3 V V olume control input voltage Pin 24 V 24 V CC °C Storage temperature range Tstg –40 to +125 °C Junction temperature Tj 125 °C Ambient temperature range Tamb –20 to +60 Power dissipation Tamb = 60°C Ptot 1.3 W Thermal Resistance Parameters Symbol Value Unit Junction ambient R thJA 50 K/W

Rev. A1, 20-May-96 Preliminary Information 4 (15)

Electrical Characteristics

V 16 = +7.5 V , V18 = 0.7 V , figure 1, Tamb = 25°C, unless other specified Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit Supply voltages Supply current V 16 = 11 V , V18 = 0.7 V V 16 = 11 V , V18 = 1.6 V Pin 16 Pin 16 9.0 800 mA Regulated output voltage Pin 20 V CC 4.9 5.4 5.9 V Line regulation (deviation)

6.5 V /C0120 V

I /C0120 11 V /C0068V CC 65 150 mV Output resistance ICC = 3 mA R O 6.0 20 Ω Dropout voltage V 16 = 5 V V CCSat 80 300 mV Output voltage Pin 21 V B 2.5 2.9 3.3 V Output resistance I B = 1.7 mA Pin 21 R O 250 Ω Attenuators Receive attenuator gain f = 1 kHz, R mode’ V24 = VB V 27 = 250 mVrms Pin 26, 27G R 2.0 6.0 10 dB Gain range R to T modes /C0068G R 40 44 48 dB Idle mode, V27 = 250 Vrms G RI –20 –16 –12 dB RECO voltage (R mode) V RECO 1.8 2.3 3.2 V Delta RECO voltage /C0068V RECO 100 mV RECO sink current (R mode) IRECOL 75 /C0109A RECO source current (R mode) IRECOH 1.0 3.0 mA RECI input resistance R RECI 3.5 5.0 8.0 kΩ V olume control range (R attenuator gain, R mode) 0.6 VB /C0120 V24 /C0120 VB V CR 24.5 22.5 32.5 dB Transmit attenuator gain Pins 3 and 4 f = 1 kHz, Tmode’ V 3 = 250 mVrms G T 4.0 6.0 8.0 dB Gain range T to R mode /C0068G T 40 44 48 dB Idle mode, V3 = 250 mVrms G TI –16.5 –13 –8.5 dB TO voltage (T mode) V TO 1.8 2.3 3.2 V Delta TO voltage switch from T to R mode /C0068V TO 100 mV TO sink current, T mode ITOL 75 /C0109A TO source current, T mode ITOH 1.0 3.0 mA TI input resistance RTI 3.5 5.0 8.0 kΩ

Rev. A1, 20-May-96 5 (15) UnitMax.Typ.Min.SymbolTest Conditions / PinsParameters Speaker amplifier Pins 15 and 19 Gain, V19 = 20 mVrms G SA 33 34 35 dB Input impedance R I 15 22 37 kΩ Output voltage (Pin 19 = cap coupled to GND) V O 2.4 3.0 3.6 V High output voltage V 19 = 0.1 V , V 15 = –100 mA V OH 5.5 V Low output voltage V 19 = –0.1 V , V 15 = +100 mA V OL 600 mA Log amplifiers Receive level detector leakage current V 8 = VB + 1.0 V Pin 8 ILR 2.0 /C0109A Transmit level detector leakage current V 6 = VB + 1.0 V Pin 6 ILT 2.0 /C0109A Transmit-Receive switching threshold V 8/V6 at 20 µA to switch Pins 5 and 7 T-R comparator Pin 25ITH 0.8 1.2 Transmit detector Pin 23 DC voltage: Idle mode T mode V 23 V 23 4.0 V Distortion Pins 15 and 27 R mode: RECI to SAO V 27 = 10 mVrms’, f = 1 kHz d 1.5 % T mode: MIC to TO V 9 = 5 mVrms’ f = 1 kHz d 2.0 %

for stability reasons. It must be located adjacent to the IC.

6.5 V , the configuration of figure 14 may be used so as to

signal is sent to the speaker the curves of figure 13 apply. Figure 14. Regulated power supply (see section on chip select), the VB voltage will go to 0 V .

Rev. A1, 20-May-96 Preliminary Information 12 (15) Switching time The switching times of the speakerphone circuit depend not only on the various external components, but also on the operating condition of the circuit at the same time a change is to take effect. For example, the switching time from idle to transmit is generally quicker than the switching time from receive to transmit (or transmit to receive). The components which most significantly affect the timing between the transmit and receive modes are those at Pin 5 (transmit turn-on), Pin 6 (transmit turn-off), Pin 7 (receive turn-on), and Pin 8 (receive turn-off). These four timing functions are not independent, but interact since the T-R comparator operates on a relative T-R com- parison, rather than on absolute values. The components at Pins 11, 12, 13 and 23 affect the timing from the trans- mit to the idle mode. Timing from the idle mode to transmit mode is relatively quick (due to the quick charging of the various capacitors), and is not greatly affected by the component values. Pins 5–8 do not affect the idle-to-transmit timing since the T-R comparator must already be in the transmit mode for this to occur. Additionally, the following should be noted: 1. The RC circuits at Pins 5 and 7 have dual function in that they affect the sensitivity of the respective log amplifiers or in other words, how loud the speech must be in order to gain control of the speakerphone circuit. 2. The RC circuit at Pin 13 also has a dual function in that it determines the sensitivity of the transmit detec- tor circuit. 3. The volume control affects the switching speed and the relative response to transmit signals in the follow- ing manner: When the circuit is in the receive mode, reducing the volume control setting increases the signal at TO, and consequently the signal to the TLI pin. Therefore, a given signal at TI will switch the circuit into the trans- mit mode quicker at low volume settings.

Rev. A1, 20-May-96 13 (15) Application

Rev. A1, 20-May-96 Preliminary Information 14 (15) Dimensions in mm Package: DIP 28

Rev. A1, 20-May-96 15 (15) Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423