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參數(shù)資料
| 型號： | TDA9556 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZIP11 |
| 封裝： | PLASTIC, CLIPWATT-11 |
| 文件頁數(shù)： | 8/22頁 |
| 文件大小： | 315K |
| 代理商： | TDA9556 |
TDA9556
16/22
10.7
AC - Coupling mode
The TDA9556 can be used in AC-Coupling mode in kit with the TDA9207 preamplifier from ST. As for the
DC-coupling mode, the TDA9556 drives perfectly the video signal in PICTURE BOOST conditions.
A typical schematic is given on the Figure 18 below.
Figure 18. Video response optimization for one channel - AC coupling application
The advantage of such an architecture is to use smaller VDD and therefore to have smaller power
consumption. This is due to the fact that the TDA9556 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 15V to VDD - 15V).
C24
4.7
F
C11
4.7
F
R10
L1
R11
CRT
OUT
VCC
VDD
TDA9207
TDA9556
IN
110
110
0.33
H
VREF
GNDP
GNDS
GNDA
C10(*)
100nF
C12(*)
100nF
-
+
DC Restore
circuitry
Cut-off
Vrestore
C1
1
F
OUT
R1
51
C1
1.5nF
Input Network #1
C2
10pF
R19(**)
33-40
(*): To be connected as close as possible to the device
(**): R19 must be mandatorily used
(***): Input Networks #2 and #3 can be used as well
(***)
C
VDD
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