STV0042A datasheet(13/24 Pages) STMICROELECTRONICS

13 / 24 page

PIN INTERNAL CIRCUITRY (continued)

FC L, FC R

Ivar is controlled by the peak det audio level max.

±15µA (1VPP audio).

FC L

FC R

DD 9V

Ivar

Figure 9

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.

Audio

2.4V Bias

30k

Ω

GND 0V

30k

Ω

VOL OUT R

VOL OUT L

15k

Ω

4.8V

Figure 10

S2 OUT L, S2 OUT R

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

Audio

2.4V Bias

20k

Ω

GND 0V

S2 OUT L

S2 OUT R

20k

Ω

Figure 11

2.4V

REF

Figure 14

S2 RTN L, S2 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 internallybiased

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.

µA

S2 RTN L

S2 RTN R

4.8V

25k

Ω

Figure 12

µA

FM IN

2.4V

10k

Ω

10k

Ω

Left Channel

Right Channel

µA

Figure 13

SCL

This is the input to a Schmitt input buffer made with

a CMOS amplifier.

SDA

µ/4µ

205

Ω

ESD

600

µ/2µ

GND 0V

Figure 16

SDA

Input same as above. Output pull down only : relies

on external resistor for pull-up.

SCL

µ/4µ

205

Ω

ESD

Figure 15

U75 L

U75 R

Figure 17

U75 L, U75 R

I1 - I2 = 2 x audio / 18k

Ω.eg 1VPP audio : ±55µA.

The are internal switches to match the audio level

of the different standards.

STV0042A

13/24

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