STV0056 datasheet(14/27 Pages) STMICROELECTRONICS

14 / 27 page

µA

10k

Ω

Pins 60 - 4

61 - 6

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

Pins 64 - 2

S1 VID OUT

S2 VID OUT

REF 2.4V

20k

Ω

Figure 3

125

µA

µ/2µ

VIDEEM1 12

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 programmablefromsource16µA

to sink 33

µA equivalent to an offset voltage of

-150mV to + 300mV. The 60

Ω collector resistor is

for short cct. protection.

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.

2.3mA

GND 0V

CC 12V

16.7k

Ω

GND 0V

Ω

UNCL DEEM

REF 2.4V

25k

Ω

Figure 4

REF 2.4V

B-BAND

6.5k

Ω

µA

GND 0V

0.5pF

Figure 7

VID IN

STV0056AF

14/27

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