STV0056A Datasheet, PDF (13/26 Pages) STMicroelectronics – SATELLITE SOUND AND VIDEO PROCESSORS

STV0056A
PIN INTERNAL CIRCUITRY
S1 VID RTN, S2 VID RTN, S3 VID RTN,
CLAMP IN
50µA source is active only when VIDIN < 2.7V.
Figure 1
50µA
V_DD 9V
S1 VID RTN
S2 VID RTN
S3 VID RTN
CLAMP IN
10kΩ
1µA
1
V_DD 5V
1
GND 0V
S3 VID OUT
I black level is I²C programmable from source 16µA
to sink 33µA equivalent to an offset voltage of
-150mV to + 300mV.
The 60Ω collector resistor is for short cct. protec-
tion.
Figure 2
60Ω
V_CC 12V
VID MUX
4
2.3mA
GND 0V
10kΩ
16.7kΩ
S3 VID OUT
25kΩ
V_REF 2.4V
I Black Level
GND 0V
S1 VID OUT, S2 VID OUT
Same as above but with no black level adjustment.
Figure 3
60Ω
V_CC 12V
VID MUX
4
2.3mA
GND 0V
10kΩ
20kΩ
20kΩ
S1 VID OUT
S2 VID OUT
V_REF 2.4V
GND 0V
UNCL DEEM
Same as above but with no black level adjustment
and slightly different gain.
Figure 4
60Ω
V_CC 12V
4
UNCL DEEM
2.3mA
IN
10kΩ
GND 0V
25kΩ
V_REF 2.4V
16.7kΩ
GND 0V
VIDEEM1
Ron of the transistor gate is ≈10kΩ.
Figure 5
6µ/2µ
10µ/2µ
VIDEEM1
1
125µA
VIDEEM2 / 22kHz
Ron of the transistor gate is ≈10kΩ.
Figure 6
6µ/2µ
10µ/2µ
VIDEEM2/22kHz
1
125µA
V_DD 5V
100µ/2µ
60µ/2µ
22kHz
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