43 44
SANYO TV . VCR SANYO TV . VCR
LA75505M3k
Ω
2k
Ω
220k
Ω
300k
Ω
300k
Ω
1
µ
F
0.01
µ
F
39pF39pF
10
µ
H
+
1
µ
F
+
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
DEEMPHA
FM
DET
LIM
AMP
EQ
AMP
BPF
BPF
S
PLL
FIL
CONT
IF
AGC
FM
DET
AFT
AMP
AMP
SW
TRAP LPF VCO
VIDEO
DET APC
DET 1 stSIF
DET
1 st
AMP
VIF
AMP
FLL
AGC
1
µ
F
+
NC
VIDEO OUT
VCO COIL
A
SYSTEM B
SW
4MHz X tal
3k
Ω
10k
Ω
2.2k
Ω
30k
Ω
47k
Ω
47k
Ω
2.2k
Ω
6.8k
Ω
100k
Ω
0.01
µ
F
0.01
µ
F
0.01
µ
F
1
µ
F
1000pF
+
PAL SW
VCC : 39.5MHz
OPEN : 38.9MHz
GND : 38.0MHz
1
µ
F100
µ
F0.022
µ
F
0.01
µ
F
0.1
µ
F
+
+
AUDIO OUT 10K-B
NENE
NE
OPEN : PAL
GND : NT
2SC3134
SAW(P)0.01
µ
F
IF INPUT
SAW(S)
VCC(5V)
VCC(9V)
RF AGC OUT
AFT OUT
FM
DET
LIM
AMP
BPF
BPF
EQ
AMP
S
PLL
FIL
CONT
IF
AGC
FM
DET
AFT
AMP
AMP
SW
TRAP LPF VCO
VIDEO
DET APC
DET 1 stSIF
DET
1 st
AMP
VIF
AMP
FLL
AGC
3k
Ω
2k
Ω
220k
Ω
330k
Ω
1
µ
F
0.01
µ
F
0.01
µ
F
39pF
+
1
µ
F
+1
µ
F
+
VIDEO OUT
CARRIER OUT
VCO COIL 4MHz X tal
IF SW
OPEN : 45.75MHz
GND : 58.75MHz
3k
Ω
7.5k
Ω
30k
Ω
47k
Ω
47k
Ω
0.01
µ
F
0.01
µ
F
0.01
µ
F
1000pF
1
µ
F100
µ
F
0.022
µ
F
0.01
µ
F
0.1
µ
F
+
+
AUDIO OUT
10K-B SAW(P) 0.01
µ
F
IF INPUT
SAW(S)
VCC(5V)
VCC(9V)
RF AGC OUT
IF INPUT
AFT OUT
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Overview
Functions and Features
Overview
Functions and Features
Block Diagram Block Diagram
VIF/SIF Signal-Processing Circuit VIF/SIF Signal-Processing Circuit
The LA75503V is a completely adjustment-free PAL VIF/SIF signal-processing IC for TV sets and VCRs.
It supports IF frequencies of 38, 38.9, and 39.5 MHz. It also provides on-chip audio carrier trap, and audio carrier bandpass filters to
support PAL multisystem audio (M/N, B/G, I, and D/K). A reference frequency of 4 MHz is used for the adjustment-free circuits,
and the VCO, AFT, and audio filters are controlled either by a crystal oscillator circuit or an external clock input.
VIF amplifier
VCO adjustment-free PLL detection circuit
Digital AFT circuit
RF AGC
Buzz canceller
Equalizer amplifier
Audio carrier bandpass filter
Audio carrier trap
PLL FM detector
Reference signal generator
The built-in VCO has been made adjustment free so that VCO coil adjustment
is not required.
The integration on the same chip of the audio bandpass filter and trap make
implementation of end products that support PAL multisystem audio easy
and low cost.
Achieves a significant reduction in the number of required peripheral
components
Obviates the problem of AFT tolerances by adopting a digital AFT system
Package: SSOP30 (275 mil)
The LA75505M is a completely adjustment-free NTSC VIF/SIF signal-processing IC for TV sets and VCRs.
It supports IF frequencies of 45.75 and 58.75 MHz.
It integrates both audio carrier trap and audio carrier bandpass filters on chip and thus is optimal for compact light weight tuners.
A reference frequency of 4 MHz is used for the adjustment-free circuits, and the VCO, AFT, and audio filters are controlled either by
a crystal oscillator circuit or an external clock input.
VIF amplifier
VCO adjustment-free PLL detection circuit
Digital AFT circuit
RF AGC
Buzz canceller
Equalizer amplifier
Audio carrier bandpass filter
Audio carrier trap
PLL FM detector