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TEA1099

Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer

Philips Electronics 

Philips Semiconductors

Speech and handsfree IC with auxiliary

inputs/outputs and analog multiplexer

handbook, full pagewidth

INPUT SIGNAL

4 mV (RMS)

1 mV (RMS)

Product specification

TEA1099H

MBG354

SIGNAL ENVELOPE

A

36 mV

B

A: 85 dB/ms

B: 0.7 dB/ms

A

B

NOISE ENVELOPE

C

B: 0.7 dB/ms

C: 0.07 dB/ms

36 mV

B

C

B

time

Fig.10 Signal and noise envelope waveforms.

Decision logic: pins IDT and SWT

handbook, full pagewidth

3 TENV

2 TNOI

13 mV

ATTENUATOR

7 RENV

5 RNOI

13 mV

Vdt

from logic

from dynamic

limiter

(1) When VDLC < 0.2 V, −10 µA is forced.

DUPLEX CONTROLLER

LOGIC(1)

IDT 25

Vref

RIDT

X X 1 1 −10 µA

X 1 0 X +10 µA

1 X 0 X +10 µA

XX1 0

0

0 00X

0

SWT 24

CSWT

Fig.11 Decision logic.

MGM303

1999 Apr 08

16

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