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參數(shù)資料
| 型號： | U4935B-ADP |
| 英文描述： | MOSFET, N, TO-3PML; Transistor type:MOSFET; Current, Id cont:2A; Resistance, Rds on:10R; Case style:TO-3PML; Current, Idm pulse:4A; Power, Pd:50W; Transistor polarity:N; Voltage, Vds max:1500V RoHS Compliant: Yes |
| 中文描述： | SECAM制式解碼器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 183K |
| 代理商： | U4935B-ADP |
U4935B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 28-Jan-97
9 (16)
Demodulator
The bell filter delivers the C signal via a limiter amplifier
to the demodulator. The demodulator is of a phase-locked
loop (PLL) type VCO and a phase-emitter coupled
multivibrator with the limiter output and is fed back to the
VCO. The free-running frequency is adjusted by charging
or discharging the capacitor at Pin 8 during the vertical
blanking and is held during scanning.
Therefore, the IC needs no adjustment to enable constant
operation
The low-frequency de-emphasis is matched to the PLL
and is controlled by the tuning voltage of the PLL.
The capacitor, C8, should be connected as close as
possible to the ground pin of the package. If this is not
ensured, a black-level error for both channels may result.
De–
emphasis
Limiter
Tuning
LPF
VCO
PLL
VBLK pulse
Bell-filter
output
C
8
PLL
ref
8
to H,
V blanking
9611721
Figure 18. Block diagram of the demodulator
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