STV9556 STMicroelectronics, STV9556 Datasheet - Page 7

• Manufacturer Part Number: STV9556
• Manufacturer: STMicroelectronics

Specifications of STV9556

• Single Supply Voltage (typ): Not RequiredV
• Single Supply Voltage (min): Not RequiredV
• Single Supply Voltage (max): Not RequiredV
• Mounting: Through Hole
• Lead Free Status / RoHS Status: Specific Sites Compliant

6
6.1
The STV9556 is a three-channel video amplifier supplied by a low supply voltage: V
high supply voltage: V
The high values of V
coupling mode).
In DC coupling mode, the application schematic is very simple and only a few external components are
needed to drive the cathodes. In particular, there is no need of the DC-restore circuitry which is used in
classical AC coupling applications.
The output voltage range is wide enough
In normal operation, the output video signal must remain inside the linear region whatever the cut-off,
brightness and contrast adjustments are.
Figure 2. Output signal, level adjustments
– Cut-off adjustment (typ. 25V)
– Video contrast (typ. up to 40V),
– Brightness (with the remaining voltage range).
15V
17V
THEORY OF OPERATION
General
V
GND
DD
Blanking pulse
(E) Bottom Non-Linear Region
(A) Top Non-Linear Region
Video Signal
DD
DD
supplying the amplifier output stage allow direct control of the CRT cathodes (DC
(up to 115V).
(Figure
(D) Contrast Adjust. (40V Typ.)
2) to provide simultaneously :
(B) Cut-off Adjust. (25V Typ.)
(C) Brightness Adjust. (10V Typ.)
CC
(typ.12V) and a
STV9556
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