STV0056 datasheet(14/26 Pages) STMICROELECTRONICS

14 / 26 page

REF 2.4V

VID IN

6.5k

Ω

10k

Ω

µA

GND 0V

0.5pF

Figure 7

DD 9V

Audio

PK OUT R

PK OUT L

Peak Detector

Ω

3.4V

Clamp

Figure 8

FC L

FC R

DD 9V

Ivar

Figure 9

Audio

2.4V Bias

20k

Ω

GND 0V

S2 OUT L

S2 OUT R

S3 OUT L

S3 OUT R

20k

Ω

Figure 11

µA

S2 RTN L

S2 RTN R

S3 RTN L

S3 RTN R

4.8V

25k

Ω

Figure 12

Audio

2.4V Bias

30k

Ω

GND 0V

30k

Ω

VOL OUT R

VOL OUT L

15k

Ω

4.8V

Figure 10

µA

FM IN

2.4V

10k

Ω

µA

10k

Ω

Left Channel

Right Channel

Figure 13

2.4V

REF

Figure 14

PIN INTERNAL CIRCUITRY (continued)

VID IN

PK OUT R, PK OUT L

FC L, FC R

Ivar is controlled by the peak det audio level max.

±15µA (1VPP audio).

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.

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

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

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.

FM IN

The other input for each channel is internally biased

in the same way via 10k

Ω to the 2.4V VREF.

IREF

The optimum value if IREF is 50

µA ±2% so an

external resistor of 47.5k

Ω ±1% is required.

STV0056A

14/26

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