STV0056A 查看數據表（PDF） - STMicroelectronics

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STV0056A

SATELLITE SOUND AND VIDEO PROCESSOR

STMicroelectronics 

STV0056A

AUDIO SWITCHING

AUDIO

K1a

K5b

K6c

DEEMPHASIS

+ ANRS

AUDIO PLL

K5c

K6a

DEC RTN

K1b

K5a

AUX IN

K1c

K6b

VOL OUT AUX OUT DEC OUT

FM DEMODULATION BLOCK DIAGRAM

K4 : a → ANRS input non-scrambled audio

b → ANRS input descrambled audio

K2

K3

a

a No ANRS, No De-emphasis

b1

a No ANRS, 50µs

b2

a No ANRS, 75µs

c

a No ANRS, J17

a

b ANRS, No De-emphasis

b1

b ANRS, 50µs

b2

b ANRS, 75µs

c

b ANRS, J17

FM IN

AGC

AGC R

AMPLK R

SW1

Phase

Detect

LEVEL

DETECTOR 1 Bias

LEVEL

DETECTOR 2

Amp. Detect

VREF

Reg8 b4

WATCHDOG

AGC

AGC L

AMPLK L

SW3

Phase

Detect

LEVEL

DETECTOR 1 Bias

LEVEL

DETECTOR 2

Amp. Detect

VREF

Reg8 b0

STV0042/STV0056A

WATCHDOG

FM dev.

Select.

VREF

DET R

AUDIO R

CPUMP R

90

VCO

0

SYNTHESIZER

AUDIO L

SW2

SW4

DET L

FM dev.

Select.

VREF

90

VCO

0

CPUMP L

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