參數(shù)資料
型號(hào)： U4460BG
英文描述： Video IF Amplifier with FPLL Demodulation
中文描述： 中頻放大器視頻與FPLL解調(diào)
文件頁(yè)數(shù)： 2/9頁(yè)
文件大小： 162K
代理商： U4460BG
Preliminary Information
Rev. A1: 15.08.1995
2 (9)
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Figure 2. Pin configuration
Circuit description
Vision IF amplifier
The video IF signal (VIF) is fed through a SAW filter to
the VIF input (Pin 5–6). The VIF amplifier consists of
three AC–coupled amplifier stages. Each differential
amplifier is gain controlled by the automatic gain control
(VIF–AGC). Output signal of the VIF amplifier is applied
to the FPLL carrier generation and the video
demodulator.
VIF–AGC and adjustable tuner AGC
At Pin 7 the VIF–AGC charges/discharges the AGC
capacitor to generate a control voltage for setting gain of
VIF amplifier and tuner in order to keep the video output
signal at a constant level. Therefore the sync level of the
demodulated video signal is the criterion for a fast charge/
discharge of the AGC capacitor.
The control voltage (AGC voltage at Pin 7) is transferred
to an internal control signal and fed to the tuner AGC to
generate the tuner AGC current at Pin 12 (open collector
output). Take over point of the tuner AGC can be adjusted
at Pin 11 by a potentiometer or an external DC voltage
(from interface circuit or microprocessor).
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