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TEA1095T データシート(PDF) 7 Page - NXP Semiconductors |
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TEA1095T データシート(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 1997 Nov 25 7 Philips Semiconductors Product specification Voice switched speakerphone IC TEA1095 Supply: pins VBB, GND and PD The TEA1095 must be supplied with an external stabilized voltage source between pins VBB and GND. In idle mode, without any signal, the internal supply current is 2.7 mA at VBB =5V. To reduce current consumption during pulse dialling or register recall (flash), the TEA1095 is provided with a power-down (PD) input. When the voltage on PD is HIGH, the current consumption from VBB is 140 µA. Transmit channel: pins TXIN, GATX, TXOUT, TXGND and MUTETX The TEA1095 has an asymmetrical transmit input (TXIN) with an input resistance of 20 k Ω. The gain of the input stage varies according to the mode of the TEA1095. In the transmit mode, the gain is at its maximum; in the receive mode, it is at its minimum and in the idle mode, it is halfway between maximum and minimum. Switch-over from one mode to the other is smooth and click-free. The output capability at pin TXOUT is 20 µA (RMS). In the transmit mode, the overall gain of the transmit amplifier (from pin TXIN to TXOUT) can be adjusted from 0 dB to 40 dB to suit application specific requirements. The gain is proportional to the value of RGATX and equals 15.5 dB with RGATX = 30.1 kΩ. A capacitor must be connected in parallel with RGATX to ensure stability of the transmit amplifier. Together with RGATX, it also provides a first-order low-pass filter. By applying a HIGH level on pin MUTETX, the transmit amplifier is muted and the TEA1095 is automatically forced into the receive mode. Fig.4 Transmit channel. handbook, full pagewidth MBG357 V I I V CTXIN VBB RMIC MUTETX TXIN from voice switch to envelope detector TXGND TXOUT GATX to transmission circuit RGATX CGATX to logic |
同様の部品番号 - TEA1095T |
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同様の説明 - TEA1095T |
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