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TEA7088A bảng dữ liệu(PDF) 2 Page - STMicroelectronics |
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TEA7088A bảng dữ liệu(HTML) 2 Page - STMicroelectronics |
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2 / 17 page  PIN DESCRIPTION Name Pin N ° Description SOFT 1 Transmit Softclipping Time Constant RECIN 2 Receiving Input SN 3 Sidetone Network Input AGC 4 Line Current Regulation Stop Value MIC1 5 Microphone Input MIC2 6 Microphone Input GTR 7 Transmit Gain Adjustment VCC 8 Transmit and Receive Part Power Supply GND 9 Ground IVLS 10 Line Current Source Power Supply VS 11 Voltage Stabilizer VL 12 Positive Line VMC 13 Unregulated Microcontroller Power Supply GREC 14 Receive Gain Adjustment EAR- 15 Negative Earphone Output EAR+ 16 Positive Earphone Output BUZ 17 Ringer Buzzer Output VRING 18 Ring Power Supply RES 19 Reset PON 20 Power On RI 21 Ring Indicator OSC 22 Oscillator Input MSK 23 Mask, Ring Melody Input DATA 24 Data Input DCL 25 Data Clock Input VRMC 26 Microcontroller Stabilized Power Supply VREF 27 Reference Voltage (VCC/2) DTMF 28 DTMF Filter SPEECH The speech network includes : - a low noise transmit channel suitable for any kind of microphone transducer. Softclipping on trans- mit 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 removed by hardware (maxi- mum 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. RINGER Up to 8 different tones can be generated by the TEA7088A ringer. The digital volume control of the ringer can be performed through a specific com- mand (4 steps). A ring indication signal is provided to the microcontroller by the TEA7088A.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 TEA7088A.The power supply is specifically designed to copewitha longflash or a long groundkey duration. The TEA7088A 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 TEA7088A. The microcontroller drives the TEA7088A through a 2 wires serial interface. TEA7088A 2/17 |
Số phần tương tự - TEA7088A |
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Mô tả tương tự - TEA7088A |
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