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TEA0679

I2C-bus controlled dual Dolby* B-type noise reduction circuit for playback applications

Philips Electronics 

Philips Semiconductors

I2C-bus controlled dual Dolby* B-type noise

reduction circuit for playback applications

Product specification

TEA0679T

Description of the principle timing diagram for AMS scan mode with initial input signal (see Fig.6)

The AMS scan mode is activated at t0. With an input signal at Vin, the following initial procedure runs until the circuit gets

a steady state status.

Due to the signal at Vin the voltage at the level detector input VI (CONTRA) slides to a value which is defined by a limiter.

This voltage causes the level detector output to charge the second time constant (time detector input Vt) to its maximum

voltage level at t1. The initial procedure is now completed.

The following behaviour does not differ from the description in Section “Description of the principle timing diagram for

AMS scan mode without initial input signal (see Fig.5)”.

handbook, full pagewidth AMS on

Vin

td

tb < tr

tf

tp < tr

t

Vl

level threshold

Vref

Vt

upper threshold

(hysteresis)

time threshold

VAMSEQ

4.5 V

output signal

to microprocessor

t0 t1

t5 t6

t7 t8 t9 t10

t11 t12 t13 t14

t15

tr = rise time; td = delay time; tb = burst time; tp = pause time; tf = fall time.

Fig.6 AMS scan mode with initial input signal.

Vl: voltage at

level detector

input

pin 8 (CONTRA)

t

Vt: voltage at

time detector

input

pin 25 (CONTRB)

t

t

MHB121

1998 Nov 12

13

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