STV0056 datasheet(13/26 Pages) STMICROELECTRONICS

13 / 26 page

µA

10k

Ω

S1 VID RTN

S2 VID RTN

S3 VID RTN

CLAMP IN

DD 5V

GND 0V

DD 9V

Figure 1

2.3mA

GND 0V

CC 12V

VID MUX

10k

Ω

16.7k

Ω

GND 0V

I Black Level

Ω

S3 VID OUT

REF 2.4V

25k

Ω

Figure 2

2.3mA

GND 0V

CC 12V

VID MUX

10k

Ω

20k

Ω

GND 0V

Ω

S1 VID OUT

S2 VID OUT

REF 2.4V

20k

Ω

Figure 3

2.3mA

GND 0V

CC 12V

10k

Ω

16.7k

Ω

GND 0V

Ω

UNCL DEEM

REF 2.4V

25k

Ω

Figure 4

125

µA

µ/2µ

VIDEEM1

Figure 5

125

µA

µ/2µ

VIDEEM2/22kHz

DD 5V

100

µ/2µ

22kHz

Figure 6

PIN INTERNAL CIRCUITRY

S1 VID RTN, S2 VID RTN, S3 VID RTN,

CLAMP IN

µA source is active only when VIDIN < 2.7V.

S3 VID OUT

I black level is I

2C programmablefrom source 16µA

to sink 33

µA equivalent to an offset voltage of

-150mV to + 300mV.

The 60

Ω collector resistor is for short cct. protec-

tion.

S1 VID OUT, S2 VID OUT

Same as above but with no black level adjustment.

UNCL DEEM

Same as above but with no black level adjustment

and slightly different gain.

VIDEEM1

Ron of the transistor gate is

≈10kΩ.

VIDEEM2 / 22kHz

Ron of the transistor gate is

≈10kΩ.

STV0056A

13/26

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