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TEA1096AT Datasheet(PDF) 11 Page - NXP Semiconductors |
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TEA1096AT Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 32 page  November 1994 11 Philips Semiconductors Product Specification Speech and listening-in IC TEA1096; TEA1096A Fig.9 Equivalent AC impedance between LN and VEE. The equivalent impedance connected between LN and VEE is illustrated in Fig.9. Where: • LEQ =REQ × CREG × RSLPE • REQ =40kΩ • ZSET = 1⁄10ZSIMP. Remark: a resistor R (REG-VEE) connected between REG and VEE (to lower the regulated voltage) changes REQ into REQ // R (REG-VEE), whereas a resistor RREG-SLPE connected between REG and SLPE (to increase the regulated voltage) has no effect on REQ. Dynamic limiter of the microphone channel: pin DLS The dynamic limiter in the microphone channel of the TEA1096/TEA1096A prevents clipping of the microphone signal, and limits the transmitted signal on LN to a maximum value of typically 3.65 V (4.4 dBm). Clipping on the microphone channel is prevented by rapidly reducing the gain when the output stage starts to saturate. The time in which the gain reduction is effected (clipping attack time) is approximately a few milliseconds. The microphone channel stays in the reduced gain mode until the peaks of the signal no longer cause saturation. The gain of the microphone channel then returns to its normal value within the clipping release time. Both attack and release time are proportional to the value of the capacitor CDLS. The THD (Total Harmonic Distortion) of the microphone amplifier in the reduced gain mode stays below 2% up to 10 dB of input voltage overdrive [provided that VMICP, VMICM is below 10 mV (RMS)]. The dynamic limiter of the TEA1096/TEA1096A also provides a microphone mute (secret function) when pin DLS is short-circuited to VEE. The microphone gain is then 80 dB lower. The release time after a microphone mute is approximately 10 ms. |
Número de pieza similar - TEA1096AT |
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Descripción similar - TEA1096AT |
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