TEA1096 查看數據表（PDF） - Philips Electronics

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TEA1096

Speech and listening-in IC

Philips Electronics 

Philips Semiconductors

Speech and listening-in IC

Product Specification

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 = 40 kΩ

• 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.

November 1994

11

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