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TEA7089A Dataheets PDF



Part Number TEA7089A
Manufacturers ST Microelectronics
Logo ST Microelectronics
Description LOW-RANGE PHONE DEDICATED CHIP
Datasheet TEA7089A DatasheetTEA7089A Datasheet (PDF)

TEA7089A LOW-RANGE PHONE DEDICATED CHIP . . . . . . . RING - GENERATION OF 8 MELODY TONES (Including the 3 German Melody Tones) - 4 STEPS DIGITAL CONTROL ON THE AMPLIFIER OUTPUT LEVEL SPEECH - TRANSMIT GAINEXTERNALLY ADJUSTABLE - RECEIVINGGAINEXTERNALLYADJUSTABLE - AGCSLOPEEXTERNALLYPROGRAMMABLE - SOFTCLIPPING ON SENDING CHANNEL - RECEIVE AMPLIFIER FOR PIEZO OR ELECTRODYNAMIC TRANSDUCER - +6dB MODE ON RECEIVE CHANNEL - LINE POWER MANAGEMENT DIALING - DTMF GENERATOR - LOW DC MASK DURING MAKE PE.

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TEA7089A LOW-RANGE PHONE DEDICATED CHIP . . . . . . . RING - GENERATION OF 8 MELODY TONES (Including the 3 German Melody Tones) - 4 STEPS DIGITAL CONTROL ON THE AMPLIFIER OUTPUT LEVEL SPEECH - TRANSMIT GAINEXTERNALLY ADJUSTABLE - RECEIVINGGAINEXTERNALLYADJUSTABLE - AGCSLOPEEXTERNALLYPROGRAMMABLE - SOFTCLIPPING ON SENDING CHANNEL - RECEIVE AMPLIFIER FOR PIEZO OR ELECTRODYNAMIC TRANSDUCER - +6dB MODE ON RECEIVE CHANNEL - LINE POWER MANAGEMENT DIALING - DTMF GENERATOR - LOW DC MASK DURING MAKE PERIOD THROUGH MICROCONTROLLER SERIAL BUS INTERFACE MICROCONTROLLER INTERFACE - 1.79MHz CLOCK OR 3.58MHz OSCILLATOR INPUT MICROCONTROLLER POWER SUPPLY MICROCONTROLLER CONTROL INTERFACE INCLUDING SERIAL BUS LINE CURRENT EXTRACTOR FOR SUPPLY OF EXTERNAL PERIPHERALS SO28 (Plastic Package) ORDER CODE : TEA7089AFP PIN CONNECTIONS S OFT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 DTMF RECIN SN AGC MIC1 MIC2 VREF VRMC DCL DATA MSK OSC RI P ON GTR DESCRIPTION The TEA7089A is a Telephone Analog Front End device, TAFE, which integrates the three basic functions of a standard telephone set : - Speech network, - DTMF generator, - Ringer generator on buzzer. A complete telephone set can be designed using TEA7089A associated with a low cost microcontroller. June 1998 VCC GND IVLS VS RES VRING BUZ 7089A-01.EPS VL VMC GREC EAR+ EAR- 1/17 TEA7089A SPEECH The speech network includes : - a low noise transmit channel suitable for any kind of microphone transducer. Softclipping on transmit line signal is provided by the chip. - a low noise receive channel with symmetrical outputs to be compatible with both piezoceramic and electrodynamic earpiece. An additional 6dB gain can be inserted in the receive channel through software control. - a line length gain control (AGC) with starting point of gain regulation fixed at 25mAline current ; slope of gain regulationis externallyadjustablewith one resistor.AGC can be removedby hardware (maximum gain flat) or by software (-2dB flat). The phone impedance and sidetone can be tuned through external networks. DTMF GENERATOR The onboard DTMF generator fullfils the CEPT requirements with an external single pole filter. PIN DESCRIPTION Name SOFT RECIN SN AGC MIC1 MIC2 GTR VCC GND IVLS VS VL V MC GREC EAREAR+ BUZ VRING RES PON RI OSC MSK DATA DCL VRMC VREF DTMF 2/17 Pin N ° 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Description Transmit Softclipping Time Constant Receiving Input Sidetone Network Input Line Current Regulation Stop Value Microphone Input Microphone Input Transmit Gain Adjustment Transmit and Receive Part Power Supply Ground Line Current Source Power Supply Voltage Stabilizer Positive Line Unregulated Microcontroller Power Supply Receive Gain Adjustment Negative Earphone Output Positive Earphone Output Ringer Buzzer Output Ring Power Supply Reset Power On Ring Indicator Oscillator Input Mask, Ring Melody Input Data Input Data Clock Input Microcontroller Stabilized Power Supply Reference Voltage (VCC/2) DTMF Filter RINGER Up to 8 different tones can be generated by the TEA7089Aringer. The digital volume control of the ringer can be performed through a specific command (4 steps). A ring indication signal is provided to the microcontroller by the TEA7089A.If more tones are requested the input RM/MSK allows to inject tones generated by the microcontroller. FURTHER ADVANTAGES The microcontroller power supply is provided by the TEA7089A.The power supply is specifically designed to copewitha longflash or a long groundkey duration. The TEA7089A is able to supply the necessary current to an external speakerphone circuit TEA7540 and loudspea ker amplifier TEA7532 without any additional circuitry. Line current and reset indications are provided to the microcontroller by the TEA7089A. The microcontroller drives the TEA7089A through a 2 wires serial interface. 7089A-01.TBL To Line C8 C30 To µP To Line C1 C12 VL RI 21 12 8 10 2 3 R10 R13 VCC Sidetone R11 R12 VCC IVLS RECIN SN C11 Figure 1 : Block Diagram VS 11 TEA7089A 18 26 17 R40 + R15 C16 C15 VREF VSTAB RING POWER SUPPLY LOGIC POWER SUPPLY BUZZER AMPLIFIER LINE CURRENT POWER SUPPLY 27 VREF C14 R14 VRING VRMC BUZ GREC 14 R17 MUTE AGC MUTE CONTROL SIDETONE & AGC EAR+ 16 Earphone Earphone Amplifier -1 SERIAL REGULATOR EAR- 15 RING GENERATOR 13 VMC C10 C3 KVL R4 SOFT 1 R8 VIN GTR DTMF GENERATOR µP INTERFACE AGC VREF PON & RESET CONTROL OSCILLATOR /2 7 23 MSK 25 DCL 24 DATA MIC1 5 To µP Microphone MIC2 6 4 9 28 20 19 22 C3 AGC DTMF GND PON To µP RES OSC VCC R25 TEA7089A 3/17 7089A-02.EPS TEA7089A ELECTRICAL CHARACTERISTICS The block diagram is given in Figure 1. The values of the different networks used in this datasheet are defined as followed : - The return loss is adjusted by R10 of 600Ω. - The transmit adjust gain network R8 is calculated in order to have a gain of 46dB typical with ILS = 22mA. - The sidetone net.


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