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参数资料
| 型号： | TDA3853T-T |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 接收器 |
| 英文描述： | AM, VIDEO DISCRIMINATOR, PDSO20 |
| 文件页数： | 14/18页 |
| 文件大小： | 152K |
| 代理商： | TDA3853T-T |
January 1992
5
Philips Semiconductors
Preliminary specication
TV IF amplier and demodulator with
TV-identication
TDA3853T
Sync pulse separator
The sync pulse separator separates
the composite sync signal to gate the
AFT. The vertical sync is used for
identification. The input is
band-limited to obtain a higher ident
sensitivity.
Table 1
Switching functions of TDA3853T.
Note
1.
capacitor on pin 7 means tracking active; LOW means tracking inactive
VIDOFF
PIN 5
TRSW
PIN 7
VIDEO
SIGNAL
IDENT
PIN 6
pin
L
L(1)
video OFF
0.5 mA sink
setting
2.2
FL(1)
video ON
H or 0.5 mA sink
Tuner AGC
The tuner AGC output current is fed to
the open-collector output on pin 19.
The take-over point is adjusted
externally at pin 2 to adapt the tuner
and SAW filter to an optimum IF input
level. The IF gain variation over the
full tuner gain range (slip) is
minimized to ensure a constant tuner
output signal.
Identication
An analog integrating network
followed by a window comparator
identifies the video signal by detection
of the duty cycle of the vertical sync
pulses. The pulses charge the
identification capacitor on pin 5.
Tracking generator (AFT)
A limited 90 degree phase-shifted
vision carrier signal is fed to the AFT
quadrature demodulator, internal RC
networks provide active phase
shifting. The linear IF signal is applied
to the other AFT quadrature
demodulator input. The AFT output
signal is applied to a gating stage.
Gating with the composite sync
pulses activates the AFT
demodulator. Therefore the AFT
output is free from video modulation.
The AFT capacitor (pin 7) is charged
by the gated AFT current. The
capacitor voltage is converted to an
DC output current on pin 9
(open-collector sink/source currents).
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