STV9556 STMicroelectronics, STV9556 Datasheet - Page 16

• 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

STV9556
10.8 AC - Coupling mode
The STV9556 can be used in AC-Coupling mode in kit with the TDA9207/9212 preamplifier from ST. As
for the DC-coupling mode, the STV9556 drives perfectly the video signal in PICTURE BOOST conditions.
A typical schematic is given on the
Figure 18. Video response optimization for one channel - AC coupling application
The advantage of such an architecture is to use smaller V
consumption. This is due to the fact that the STV9556 provides only the video signal and not the cut-off
adjustment. The disadvantage is to have an application with more components (DC restore circuitry).
Note that it is mandatory to keep the output video signal (point C) inside the linear area of the amplifier
(from 17V to V
16/24
Caution: For Application with Tr/Tf>5.5ns, the PreAmplifier bandwidth register (BW, Register 13)
must be set to minimum value (0 dec)
(
(
(***): R19 must be mandatorily used
(****): Input Networks #2 and #3 can be used as well
*
**
): To be connected as close as possible to the device
): R1 must be not be higher than 100
OUT
Cut-off
Input Network #1 (****)
DD
- 15V).
R1(**)
Reference
DC Restore
1.5nF
51
C1
circuitry
V
restore
4.7 F
C11
10pF
C2
Figure 18
IN
V
GNDA
REF
V
C10(*)
100nF
STV9556
CC
below.
+
-
GNDS
C12(*)
100nF
V
DD
GNDP
OUT
33-40
R19(***)
DD
110
R10
and therefore to have smaller power
C
0.33 H
L1
4.7 F
C24
1 F
C1
V
DD
110
R11
CRT