ICs for VCR
1
AN3275SB
CM detection IC for VCRs in the North American market
n Overview
The AN3275SB is an IC which detects both a low
luminance of video signal and a low sound amplitude
based on that is ADLE Inc.'s
patent of the CM detection technology. Using this IC and
a free memory area in a microcomputer, you can easily
carry out a CM detection for VCRs used in the North
America.
n Features
• Video black detection
• Low sound detection
• Generation of various masking pulses
(Detecting H-mask, V-mask and envelope)
• Generation of the pulse (CLR pulse) for an event latch
• Usable for COMMERCIAL ADVANCE, MOVIE AD-
VANCE and CA-LITE
n Applications
• Stand-alone VCR
n Block Diagram
Note) is a trademark registered by SRT, Inc., invented by Jerry Iggulden who closed a licensing contract under
the cooperation of Arthur D. Little Enterprises, Inc.
SSOP036-P-0450A
Unit: mm
8.4±0.3
0.5
0.1±0.1
11.93±0.3
2.85±0.2
15.2±0.3
36 19
118
0.3±0.11 0.8
1.30±0.25 1.30±0.25
Seating plane
0.2
+0.10
–0.05
GND
36
CA/MA SEL
35 34
V IN
33
C TRAP
32
CL CAP
31
CA
V FIL
30
CA
V LEV
29
MA
V FIL
28
MA
V LEV
27
N.C.
26
V DET
25
SYNC FIL
24
VS OUT
23
VMW
22
VMD
21
ENVH DET
20
ENVL DET
V
CC
HMW
RA IN
P
A
IN
MA
V LEV
MA
A FIL
CA
A FIL
CA
A LEV A DET
CLR IN
CLR OUT ENV DET PB FM IN
HSW IN
ENV ADJ.
19
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Clamp
Clamp
MM3
H-DL
MM4
H-WD
LPF
Amp. 2
Sync.
sepa.
Amp.
Black video
detect
V-sync.
sepa.
Non-audio
detect
Audio 1
Latch 2
Video 1
Latch 2
Counter
Counter
ENV detectorMix.
MM1
V-DL
MM2
V-WID
BP
H mask
LPF3
V mask
H mask
V mask
ENV mask
MA
MA
CA
CA
E/V mask
E/V mask
E/V mask
MA
CA