SAA7326 datasheet(16/68 Pages) PHILIPS

Part #	SAA7326

Description	Digital servo processor and Compact Disc decoder with integrated DAC CD10

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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16 / 68 page

1999 Jun 17

16

Philips Semiconductors

Product speciﬁcation

Digital servo processor and Compact Disc

decoder with integrated DAC (CD10)

SAA7326

7.7.4

MUTE, FULL-SCALE, ATTENUATION AND FADE

A digital level controller is present on the SAA7326 which

performs the functions of soft mute, full-scale, attenuation

and fade; these are selected via decoder register 0:

• Mute: signal reduced to 0 in a maximum of 128 steps;

(3/n) ms

• Attenuate: signal scaled by −12 dB

• Full-scale: ramp signal back to 0 dB level. From mute

takes (3/n) ms

• Fade: activates a 128 stage counter which allows the

signal to be scaled up/down by 0.07 dB steps

– 128 = full-scale

– 120 =

−0.5 dB (i.e. full-scale if oversampling filter

used)

–32 =

−12 dB

– 0 = mute.

7.7.5

PEAK DETECTOR

The peak detector measures the highest audio level

(absolute value) on positive peaks for left and right

channels. The 8 most significant bits are output in the

Q-channel data in place of the CRC bits. Bits 81 to 88

contain the left peak value (bit 88 = MSB) and

bits 89 to 96 contain the right peak value (bit 96 = MSB).

The values are reset after reading Q-channel data via

SDA.

Fig.11 Concealment mechanism.

Interpolation

Hold

Interpolation

MGA372

OK

Error

OK

Error

OK

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SAA7326 Datasheet(PDF) 16 Page - NXP Semiconductors

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