SAA7706H 데이터 시트보기 (PDF) - Philips Electronics

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SAA7706H

Car radio Digital Signal Processor (DSP)

Philips Electronics 

Philips Semiconductors

Car radio Digital Signal Processor (DSP)

Product specification

SAA7706H

8 FUNCTIONAL DESCRIPTION

8.1 Analog front-end

The analog front-end consists of two identical sigma-delta

stereo ADCs (ADC1 and ADC2) with several input control

blocks for handling common mode signals and acting as

input selector. A mono version (ADC3) is added for

handling RDS signals. Also a first-order sigma-delta ADC

for tuner level information is incorporated.

The switches S1 and S2 select (see Fig.3) between the

FM_MPX/FM_RDS and the CD, TAPE, AUX, AM,

PHONE and NAV connection to ADC1 and ADC2. The

inputs CD, TAPE, AUX, AM, PHONE and NAV can be

selected with the audio input controls (AIC1/2). The

ground reference (G0 and G1) can be selected to be able

to handle common mode signals for CD or TAPE. The

ground reference G0 is connected to an external pin

and G1 is internally referenced (see Fig.4).

The PHONE and NAV inputs have their own CMRR input

stage and can be redirected to ADC1/2 via the Audio Input

Control (AIC). For pin compatibility with SAA7704,

SAA7705 and SAA7708 the AM is combined with the NAV

input. It is also possible to directly mix PHONE or NAV

(controlled with MIXC) with the front FSDAC channels

after volume control. The FM inputs (FM_MPX/FM_RDS)

can be selected with external pin SEL_FR. The

FM and RDS input sensitivity can be adjusted with VOLFM

and VOLRDS via I2C-bus.

2001 Mar 05

11

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