Vif/sif signal-processing circuit, Overview, Functions – Sanyo EP58B User Manual
Page 24
LA75520VA
45
46
SANYO TV . VCR
SANYO TV . VCR
LA75525VA
270k
Ω
150k
Ω
3.3k
Ω
0.01
µ
F
0.033
µ
F
0.47
µ
F
0.01
µ
F
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VIDEO
OUTPUT
SW10
SW11
V3
V2
V1
VIF FREQ
4.43/4MHz
1000P
1000P
AFT OUTPUT
VCC
SW13
SW15
SAWF
(S)
SAWF(P)
RF AGC
OUTPUT
VIF/SIF
INPUT
0.022
µ
F
1
µ
F
1
µ
F
AUDIO
OUTPUT
SOUND CARRIER
OUTPUT
*(Number)for VQFN
AMP
VIF
AMP
SIF
AMP
1 stSIF
AMP
EQ
AMP
FM
DET
AGC
APC
TRAP
INT
VIDEO
DET
SPLI
IF
AGC
RF
AGC
VCO
AFT
AGC
SW
MODE
CTRL
(25)
(24)
(23)
(22)
(21)
(20)
(17)
(16)
(15)
(14)
(13)
(12)
(19,18)
(26)
(27)
(1,2)
(3)
(4)
(5)
(6)
(8)
(9)
(10)
(11)
330P
SYSTEM SW
A
SYSTEM SW
B
V4
V2
V3
V1
DE-
EMP
TRAP
AMP
270k
Ω
1
µ
F
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
330
k
Ω
330
Ω
4.5M
BPF
VIDEO
OUTPUT
560
Ω
SW10
SW11
V4
V3
V2
V1
TV/FM
3.58/4MHz
1000P
AFT OUTPUT
VCC
SW13
SAWF
(S)
SAWF(P)
RF AGC
OUTPUT
VIF/SIF
INPUT
SW15
0.022
µ
F
1
µ
F
0.01
µ
F
AUDIO
OUTPUT
SOUND CARRIER
OUTPUT
*(Number)for VQFN
AMP
LIM
AMP
LIM
AMP
VIF
AMP
1 stSIF
AMP
EQ
AMP
TV
FM
FM
DET
TV
APC
FM
APC
TRAP
INT
INT
EXT
VIDEO
DET
SPLI
IF
AGC
RF
AGC
VCO
AFT
AGC
SW
MODE
CTRL
(25)
(24)
(23)
(22)
(21)
(20)
(27)
(16)
(15)
(14)
(13)
(12)
(19,18)
(26)
(27)
(1,2)
(3)
(4)
(5)
(6)
(8)
(9)
(10)
(11)
15
µ
F
Overview
Overview
Block Diagram
Block Diagram
VIF/SIF Signal-Processing Circuit
VIF/SIF Signal-Processing Circuit
The LA75520VA is a completely adjustment-free PAL VIF/SIF IC for TV sets and VCRs. It supports IF frequencies of 38, 38.9,
and 39.5 MHz. It integrates an automatic adjustment circuit for the VCO, an AFT circuit, and an audio carrier trap circuit on the
same chip and requires the input of either a 4 MHz or 4.43 MHz reference signal.
Automatic adjustment VCO (no external VCO coil is required)
Built-in audio carrier trap supports the B/G, I, D/K, and M/N audio systems
Digital AFT adopted
Package: SSOP24 (275mil)
Automatic adjustment VCO (no external VCO coil is required)
Built-in audio carrier trap; an external circuit may be used if desired
Digital AFT adopted
FM radio receiver function
Package: SSOP24 (225mil)
The LA75525VA is a completely adjustment-free NTSC VIF/SIF IC for TV sets and VCRs. It supports IF frequencies of 45.75 and
58.75 MHz. It integrates an automatic adjustment circuit for the VCO, an AFT circuit, and an audio carrier trap circuit on the same
chip and requires the input of either a 4 MHz or 3.58 MHz reference signal.
Functions
Functions