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參數資料
| 型號： | TDA9533 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PZFM15 |
| 封裝： | PLASTIC, MULTIWATT-15 |
| 文件頁數： | 15/16頁 |
| 文件大小： | 248K |
| 代理商： | TDA9533 |
TDA9533
8/16
6.3 - Amplifier gain and cut-off adjustment
A very simplified schematic of each TDA9533
channel is shown in Figure 3.
The feedback net of each channel is integrated
with a built-in voltage gain of 19.3 (40k/2k).
The cut-off level of each channel is controlled by
the cut-off input. Vref is adjustable from 1 to 6V ac-
cording to the formula:
The total gain of the amplifier related to VCut-off is
14. Consequently we have:
VOUT = 140 - (14 x VCut-off) - (19.3 x VIN)
Caution: If not used, the cut-off inputs have to be
set to DC voltage. The value of this DC voltage is
chosen to reach the optimum value of cut-off out-
put (see Figure 7).
Figure 3. Simplified Schematic of one channell
Vr ef
10
VCut off
–
1.5
-------------------------------------
=
Vref
2k
40k
GND
VDD
OUT
Cut-off
IN
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| TDA955X | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:TV signal processor-Teletext decoder with embedded m-Controller |
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