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| U4460BG Datasheet, PDF (2/9 Pages) TEMIC Semiconductors – Video IF Amplifier with FPLL Demodulation | |||
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U4460BG
TELEFUNKEN Semiconductors
Pin description
Pin
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 1
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 2
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 3
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 4
5, 6
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 7
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 8
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 9
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 10
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 11
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 12
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 13
14
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 15
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 16
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 17
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 18
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 19
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 20
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 21, 22
23
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 24
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 25
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 26
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 27
ÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃÃ 28
Symbol
n.c.
n.c.
GND
n.c.
Vi,VIF
CAGC
GND
n.c.
n.c.
Rtop
Itun
Vo,vid
n.c.
n.c.
n.c.
GND
Cref
LF
n.c.
Vvco
VAFC
Vs
n.c.
n.c.
Rcomp
n.c.
Function
not connected
not connected
Ground
not connected
VIF input (symmetrical)
VIFâAGC (time constant)
Ground
not connected
not connected
Take over point, tuner AGC
Tuner AGC output current
Video output
not connected
not connected
not connected
Ground
Internal reference voltage
Loop filter
AFC switch
VCO circuit
AFC output
Supply voltage
not connected
not connected
Offset compensation
not connected
n.c. 1
n.c. 2
28 n.c.
27 Rcomp
GND 3
26 n.c.
n.c. 4
25 n.c.
Vi, VIF 5
Vi, VIF 6
CAGC 7
GND 8
24 VS
23 VAFC
22 VVCO
21 VVCO
n.c. 9
20 n.c.
n.c. 10
19 LF
Rtop 11
18 CRef
Itun 12
17 GND
VO, vid 13
16 n.c.
n.c. 14
15 n.c.
95 10650
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 5â6). The VIF amplifier consists of
three ACâcoupled amplifier stages. Each differential
amplifier is gain controlled by the automatic gain control
(VIFâAGC). Output signal of the VIF amplifier is applied
to the FPLL carrier generation and the video
demodulator.
VIFâAGC and adjustable tuner AGC
At Pin 7 the VIFâAGC 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).
2 (9)
Preliminary Information
Rev. A1: 15.08.1995
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