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TEA1094 数据表(PDF) 7 Page - NXP Semiconductors |
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TEA1094 数据表(HTML) 7 Page - NXP Semiconductors |
7 / 28 page 1996 Jul 15 7 Philips Semiconductors Product specification Hands free IC TEA1094; TEA1094A Fig.4 Hands-free telephone set principles. handbook, full pagewidth MGE438 DUPLEX CONTROL HYBRID telephone line sidetone acoustic coupling TEA106x TEA1094 TEA1094A Supply: pins VBB, GND and PD The TEA1094 and TEA1094A must be supplied with an external stabilized voltage source between pins VBB and GND. In the idle mode, without any signal, the internal supply current is 3.1 mA at VBB =5V. To reduce the current consumption during pulse dialling or register recall (flash), the TEA1094A is provided with a power-down (PD) input. When the voltage on PD is HIGH the current consumption from VBB is 180 µA. Microphone channel: pins MIC, GAT, MOUT, MICGND and MUTET (see Fig.5) The TEA1094 and TEA1094A have an asymmetrical microphone input MIC with an input resistance of 20 k Ω. The gain of the input stage varies according to the mode of the TEA1094 and TEA1094A. 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 MOUT is 20 µA (RMS). In the transmit mode, the overall gain of the microphone amplifier (from pins MIC to MOUT) can be adjusted from 0 dB up to 31 dB to suit specific application requirements. The gain is proportional to the value of RGAT and equals 15.5 dB with RGAT = 30.1 kΩ. A capacitor must be connected in parallel with RGAT to ensure stability of the microphone amplifier. Together with RGAT, it also provides a first-order low-pass filter. By applying a HIGH level on pin MUTET, the microphone amplifier is muted and the TEA1094 and TEA1094A are automatically forced into the receive mode. |
类似零件编号 - TEA1094 |
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类似说明 - TEA1094 |
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