TDA4443 Datasheet, PDF (6/7 Pages) STMicroelectronics – MULTISTANDARD VIDEO IF AMPLIFIER

TDA4443
DEFINITION OF MODE SWITCHING
Status
A
B
C
Pin 2
Not connected
12V
HIgh Impedance
12V
Low Impedance
Pin 4
No External Voltage
No External Voltage
No External Voltage
D No specifications ≥ 7.5V
The gating pulse at Pin 7 is internally switched off.
Function
Standard B/G mode, gated charge and discharge.
Standard B/G, ungated, charging up to sync. level, discharging
dependant from average signal (peri operation).
At standard L ungated, charging up to peak white level,
discharge dependant from average signal level, inverted polarity
of the video output.
In VTR reading mode the IF amplifier is blocked, turned gain
controlled down : the video output signal is fixed at constant ultra
white level for standard B/G mode.
STATUS OF MODE SWITCHING, REFERRING TO CONTROL VOLTAGE PIN 2
Control Voltage
Pin 2
1.2 to 2.5V*
3.0 to 5.0V
> 6.5V
0.0 to 0.8V
Connections of
Pin 2
Open
High Impedance
Low Impedance
Ground
Status
Function
A Standard B/G gated sync. operation
B Standard B/G, no sync., operation
C Standard L
D Standard L
* Voltage measured on Pin 2.
STATUS D A B
C
V2
0.8 2.5
5.0 6.5
1.2 3.0
I2 (nA)
3
+12V
I2
TDA4443
V2
2
1
0
V2 (V)
0
4
8
12
6/7