STV0056AF 查看數據表（PDF） - STMicroelectronics

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STV0056AF

SATELLITE SOUND AND VIDEO PROCESSOR

STMicroelectronics 

STV0056AF

PIN INTERNAL CIRCUITRY (continued)

PK OUT R, PK OUT L

Figure 8

VDD 9V 3.4V

Clamp

Audio

1

Peak Detector

1

5kΩ

Pins 51 - 52

PK OUT R

PK OUT L

FC L, FC R

Ivar is controlled by the peak det audio level max.

±15µA (1VPP audio).

Figure 9

Pin 55 - 57

FC L - FC R

VDD 9V

1

1

Ivar

VOL OUT R, VOL OUT L

Audio output with volume and scart driver with

+12dB of gain for up to 2VRMS. The opamp has a

push-pull output stage.

Figure 10

Audio

2.4V Bias

30kΩ

30kΩ

15kΩ

Pins 62 - 3

VOL OUT R

VOL OUT L

4.8V

GND 0V

S2 OUT L, S2 OUT R, S3 OUT L, S3 OUT R

Same as above but with gain fixed at +6dB.

Figure 11

Audio

2.4V Bias

20kΩ

Pins 5 - 7 - 23 - 24

S2 OUT L

S2 OUT R

S3 OUT L

S3 OUT R

GND 0V

S2 RTN L, S2 RTN R, S3 RTN L, S3 RTN R

4.8V bias voltage is the same as the bias level on

the audio outputs.

Figure 12

Pins 17 - 18 - 20 - 21

S2 RTN L - S2 RTN R

S3 RTN L - S3 RTN R

4.8V

25kΩ

50µA

FM IN

The otherinput for each channelis internallybiased

in the same way via 10kΩ to the 2.4V VREF.

Figure 13

2.4V

FM IN 19

10kΩ

Left Channel

50µA

10kΩ

Right Channel

50µA

IREF

The optimum value if IREF is 50µA ±2% so an

external resistor of 47.5kΩ ±1% is required.

Figure 14

2.4V

1

50 IREF

I/O / 22kHz

The input is TTL compatible.

The output is tri-stateable.

Figure 15

MUX

22kHz

180µ/2µ

100µ/2µ

I/O/22kHz

25

205Ω

ESD

10µ/2µ

IIC Reg

91µ/2µ

SCL

This is the input to a Schmitt input buffer made with

a CMOS amplifier.

Figure 16

SCL 26

205Ω

ESD

24µ/4µ

15/27

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