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ICs for VCR
AN3275SB
CM detection IC for VCRs in the North American market
s 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.
Unit: mm
15.20.3 36 19
0.2-0.05
+0.10
8.40.3 11.930.3
s 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 ADVANCE and CA-LITE
1
18
1.300.25
1.300.25
0.30.11
0.8 Seating plane
SSOP036-P-0450A
s Applications
* Stand-alone VCR
s Block Diagram
CA/MA SEL ENVH DET 17 20 ENV ADJ. ENVL DET 18 19 MA V LEV CA V LEV SYNC FIL MA V FIL CA V FIL VS OUT
CL CAP
C TRAP
V DET
VMW
0.10.1
36
35
33
32
31
30
29
28
27
26
25
24
23
22
34
MA CA
Clamp LPF Clamp
BP
Counter Video 1 Latch 2 MM1 V-DL MM2 V-WID
V mask ENV mask
Amp. Sync. sepa.
Black video detect V-sync. sepa.
E/V mask
H mask
MM3 H-DL MM4 H-WD
LPF3
E/V mask
V mask H mask
Amp. 2
Non-audio detect
MA
Audio 1 Latch 2
CA MA
Counter
E/V mask
Mix.
13 14 15
ENV detector
16
CA
10
11
HMW
RA IN
PA IN
MA V LEV
MA A FIL
CA A FIL
CA A LEV
A DET
CLR IN
12
1
2
3
4
5
6
7
8
9
CLR OUT
ENV DET
PB FM IN
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.
HSW IN
VCC
21
VMD
GND
V IN
N.C.
2.850.2
0.5
1
AN3275SB
s Pin Descriptions
Pin No. 1 2 3 4 5 6 Symbol VCC HMW RA IN PA IN A FIL MA A LEV Description Supply voltage (5 V typ.) H-mask width period adjustment Audio recording input Audio playback input Audio filter MOVIE ADVANCE audio detection level adjustment 7 MA A FIL MOVIE ADVANCE audio filter 8 CA A FIL COMMERCIAL ADVANCE audio filter 9 CA A LEV COMMERCIAL ADVANCE audio detection level adjustment 10 11 A DC A DET Audio DC Audio detection latch output to a microcomputer 12 13 14 15 16 CLR IN CLR OUT ENV DET PB FM IN HEAD AMP SW 17 18 ENV ADJ. V DET OUT ENV mask level adjustment Video detection delay adjustment 36 GND E/V mask pulse input E/V mask pulse output PB FM envelope detection filter PB FM envelope input Head amp. switch pulse input 30 31 32 33 34 35 CA V FIL CL CAP C TRAP VIN A REF CA/MA SEL 28 29 MA V FIL CA V LEV 26 27 N.C MA V LEV 25 V DET 21 22 23 24 VMD VMW VS OUT SYNC FIL 20 ENV H DET Pin No. 19 Symbol ENV L DET
ICs for VCR
Description PB FM envelope peak detection (below) PB FM envelope peak detection (upper) V-mask time delay adjustment V-mask width period adjustment Vertical sync. signal output Vertical sync. signal separation filter Black picture detection output to a microcomputer No connection MA video detection level adjustment MA video filter control CA video detection level adjustment CA video filter control Capacitor for clamping Chroma trap filter Video input Audio reference Selection of CA, MA (CA-LITE) Signal processing circuit GND
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation
*2 *1
Symbol VCC ICC PD Topr Tstg
Rating 5.5 35 450 -20 to +70 -55 to +125
Unit V mA mW C C
Operating ambient temperature Storage temperature
*1
Note) *1: Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25C. *2: The power dissipation shown is for the IC package at Ta = 70C.
2
ICs for VCR
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 4.75 to 5.25
AN3275SB
Unit V
s Electrical Characteristics at VCC = 5.0 V, Ta = 25C
Parameter Supply current CA mode hold voltage CL SLP mode hold voltage CL SP,MA mode hold voltage Pin 32 output impedance Pin 5 output impedance VSS pulse high level VSS pulse low level CLR pulse high level CLR pulse low level Video det. output high level Video det. output low level Audio det. output high level Audio det. output low level Black det. level 1 (CA mode) *1 Black det. level 2 (CA mode) *1 Non-audio detection level 1 (CA mode) Non-audio detection level 2 (MA mode) Black detection adjustment range 1 *1 Black detection adjustment range 2 *1 Non-audio detection adjustment range 1 Non-audio detection adjustment range 2 V-mask delay V-mask width Symbol ICC V35H V35M V35L R32 R5 V23H V23L V13H V13L V25H V25L V11H V11L VDET1 VDET1 ADET1 ADET2 VAD1 VAD2 AAD1 AAD2 tVD tVW MA mode Outoput 23, with 10 k to GND Outoput 23, with 10 k to VCC Outoput 13, with 10 k to GND Outoput 13, with 10 k to VCC Outoput 25, with 10 k to GND Outoput 25, with 10 k to VCC Outoput 11, with 10 k to GND Outoput 11, with 10 k to VCC Input 33, output 25 Video signal: 140IRE = 2.1 V[p-p] Input 33, output 25 Video signal: 140IRE = 2.1 V[p-p] Input 3, output 11 Pin 7: 47 k to GND, fIN = 1.0 kHz Input 4, output 11 Pin 7: 47 k to GND, fIN = 5 kHz Input 33, output 25, pin 29 = DC, sweep: 140 IRE = 2.1V[p-p] Input 33, output 25, pin 27 = DC, sweep: 140 IRE = 2.1V[p-p] Input 3, output 11 Pin 9 = DC, sweep, fIN = 1.0 kHz Input 4, output 11 Pin 6 = DC, sweep, fIN = 5 kHz Input 33, output 13 Delay from VSS: 0.1 uF, pin 21: 0.1 F Input 33, output 13, pin 22: 0.22 F Conditions Min 3.5 1.75 0 Typ 21 Max 28 5.0 3.0 1.25 Unit mA V V V V V V V V V V V (IRE) (IRE) mV[p-p] mV[p-p] (IRE) (IRE)
1 830 2 030 2 230 4 505 5 005 5 505 4.0 4.0 4.0 4.0 10.5 8.5 56 1.8 7 7 50 2.4 1.65 11 13 11 76 3.6 1.95 12.5 0.5 0.5 0.5 0.5 15.5 13.5 96 5.4 28 28
100 mV[p-p] 5.2 2.25 14 mV[p-p] ms ms
Note) *1: The unit which stands for the ratio of the video signal amplitude to a total amplitude. 140IRE = 2.1 V[p-p]
3
AN3275SB
s Electrical Characteristics at VCC = 5.0 V, Ta = 25C (continued)
Parameter H-mask delay H-mask width ENV detection level Symbol tHD tHW SE Conditions Input 33, output 30, delay from HSS Input 33, output 30, pin 2: 2 700 pF Input 15, output 13, VIN = 200 mV[p-p] Min 10.5 30 - 5.5 Typ 12.5 34 - 7.5
ICs for VCR
Max 14.5 38 - 9.5
Unit s s dB
* Design reference data
Note) The characteristics below are theoretical values based on the IC design and are not guaranteed.
Parameter Black detection block Pin33 sync. DC level Chroma trap frequency characteristics LPF2 frequency characteristics Pin 30 output dynamic range *1 Pin 30 pedestal DC level Pin 28 output dynamic range *1 Pin 28 pedestal DC level Masking level DC offset Black detection hysteresis HSS,VSS block Sync. separation minimum input sensitivity HSS front edge delay VSS front edge delay VSS pulse width Non-audio detection block LPF3 frequency characteristics Pin 7 output dynamic range
Symbol
Conditions
Min
Typ
Max 0.2
Unit
VSY33 fV2 fV3 V30 VPD30 V28 VPD28 VPD VVCN
Input 33, output 33 Pin 33: 1.0 F, 140IRE = 2.1 V[p-p] Input 33, output 30 Ratio of pin 30 = 500 kHz to 3.58 MHz Input 33, output 30 Ratio of pin 30 = 500 kHz to 1.0 MHz Input 33, output 30 Pin 30: 10 k to GND Input 33, output 30 Pin 30: 10 k to GND Input 33, output 28 Pin 28: 10 k to GND Input 33, output 28 Pin 28: 10 k to GND
1.8 - 35 - 3.0 30 1.6 30 1.6 0.0 130
V dB dB (IRE) V (IRE) V V
Input 33, output 28 - 2.0 Pin 28: 10 k to GND, pin 2 = GND Input 28, output 18 Pin 28 = triangular wave 105
155 mV[p-p]
SHSS tDHSS tDVSS tWVSS fA1 V7
Input 33, output 24 Pin 33: VIN = 2.1 V[p-p], white 100% HSS front edge delay from input 33, output 24, pin 33 Input 33, output 23 Input 33, output 23

40 1.0 25 215 -3 5.0

% s s s
Input 4, output 7 Ratio of pin 7 = 5 kHz to 15 kHz Input 4, output 7
dB mV[p-p]
Note) *1: The unit which stands for the ratio of the video signal amplitude to a total amplitude. 140IRE = 2.1 V[p-p]
4
ICs for VCR
s Electrical Characteristics at VCC = 5.0 V, Ta = 25C (continued)
* Design reference data (continued)
Note) The characteristics below are theoretical values based on the IC design and are not guaranteed.
AN3275SB
Parameter Envelope detection block ENV detection adjustment range ENV detection hysteresis SP ENV pulse front edge delay SP ENV pulse width SP ENV pulse hysteresis
Symbol
Conditions
Min -3
Typ 1.7 0.4 570 80
Max +3
Unit
EAD VENON tDHSW tWSHW VHSON
Input 15, output 13 VIN = pin 15, 200 mV[p-p] Input 15, output 13 VIN = pin 15, 200 mV[p-p] Input 16, output 13 VIN = rectangular wave, 0 V to 5 V 300 Hz Input 16, output 13 VIN = rectangular wave, 0 V to 5 V 300 Hz Input 16, output 13 VIN = triangular wave, 2 V[p-p] 300 Hz
dB dB s s mV[p-p]
s Terminal Equivalent Circuits
Pin No. 1 2 VCC HMW Equivalent circuit Impedance Current output
3.5 V 0V
Signal waveform
DC (V) 5.0
2
200
HSS
HSS on
3
RA IN (CA)
10 k
2.3
10 k
200
Sin wave
3
5
AN3275SB
s Terminal Equivalent Circuits (continued)
Pin No. 4 PA IN (MA, CL) Equivalent circuit Impedance 10 k
ICs for VCR
Signal waveform
DC (V) 2.3
10 k
200
Sin wave
4
5
A FIL
5005
1.5
5 005 200 5 2 k
6
MAALEV
21 k
DC
2.1
70 k 6 200 30 k
7
MAAFIL
Current output
i
200
0V (R GND)
7
6
ICs for VCR
s Terminal Equivalent Circuits (continued)
Pin No. 8 CAAFIL Equivalent circuit Impedance Tr-C
AN3275SB
Signal waveform DC
DC (V) CA 0 V MA open
80 k
8
Low at CA
20 k
9
CAALEV
19 k
DC
2.1
75 k 9 200 25 k
10
A DC
10 k
DC
2.8
10 k 200
10
11
A DET
Tr-C
11
7
AN3275SB
s Terminal Equivalent Circuits (continued)
Pin No. 12 CLR IN Equivalent circuit Impedance Tr-B
ICs for VCR
Signal waveform
DC (V) 0
10 k 200 12
500 30 k
13
CLR OUT
Tr-C
13
14
ENVDET
2.0 k
1.0
2 k 200
14
15
PB FM IN
20 k
2.7
20 k
200
15
8
ICs for VCR
s Terminal Equivalent Circuits (continued)
Pin No. 16 HEAD AMP SW Equivalent circuit Impedance 11 k
AN3275SB
Signal waveform
DC (V) 1.3
3 600
200
8 400 16
17
ENV ADJ.
25 k
DC
2.7
45 k
17 55 k
18
V DET OUT 18 10 k 500 7 pF MA on
Tr-B
0
70 k
19
ENV L DET
200
3.3
200 19
200
9
AN3275SB
s Terminal Equivalent Circuits (continued)
Pin No. 20 ENV H DET Equivalent circuit Impedance 200
ICs for VCR
Signal waveform
DC (V) 1.8
200
200
20
21
VMD
Current output
3.5 V 0V
21 VSS on
200
VSS
22
VMW
Current output
3.5 V 0V
22 MMI on
200
VSS
23
VS OUT
Tr-C
23
10
ICs for VCR
s Terminal Equivalent Circuits (continued)
Pin No. 24 SYNC FIL Equivalent circuit Impedance 2 100
AN3275SB
Signal waveform
DC (V) 1.5
2 100
200
24
25
V DET
Tr-C
25
26 27
N.C. MA V LEV
25 k
DC
2.6
47 k 27 200 53 k
28
MA V FIL
1 000
DC
Pedestal 1.8
1 000
200
28
11
AN3275SB
s Terminal Equivalent Circuits (continued)
Pin No. 29 CA V LEV Equivalent circuit Impedance 25 k
ICs for VCR
Signal waveform DC
DC (V) 2.9
49 k 29 200 51 k
30
CA V FIL
200
DC
Pedestal 1.8
200
200
30
31
CL CAP
Push-pull
DC
3.0
31 i
32
CTRAP
2 030
Sync. 1.8
2 030
200
32
12
ICs for VCR
s Terminal Equivalent Circuits (continued)
Pin No. 33 V IN Equivalent circuit Impedance Tr-E
AN3275SB
Signal waveform
DC (V) Sync. 1.8
200 200 33
34
A REF (AUDIO reference)
25 k
DC
2.9
43 k 200 34
57 k
35
CA/MA SEL 35 200 10 k 50 k 50 k
25 k
DC
2.5
36
GND
13
AN3275SB
s Reference
ICs for VCR
* Description on COMMERCIAL ADVANCE: The COMMERCIAL ADVANCE technology is focused on detecting a black level existing between a program and a CM in the TV broadcasting in the North America and the rental video tapes so as to let a microcomputer recognize a CM part by its algorithm in order to skip the CM automatically. This IC is designed for a black level detection of a video signal and for no-sound detection. There are the following three modes in the CA technology: 1) COMMERCIAL ADVANCE mode Once a program is recorded in this mode, its CM part is automatically identified and is skipped from the next playback. First it identifies the CM in recording the program, then puts a mark on the CM position on the video tape so that the mark can be detected at the playback to erase the sound of the marked part and display a blue color on the TV screen. In the case that the tape not recorded in the commercial advance mode has been played back in this particular mode, the marking will be done and the commercial will be skipped from the next playback. 2) MOVIE ADVANCE mode The mode is used to play back the recorded rental video tape. You can automatically skip the commercials or commercial promotions (preview) placed before a movie start and can move to a movie starting point. In this mode, there are two modes available: one that skips all of a preview commercial and the other that stops skipping just before a preview commercial, so that you can make a choice when you want to watch a preview commercial. 3) CA-LITE mode In any programs recorded by either way, the VCR enters into a FORWARD SEARCH mode if a user presses the Skip button, and when a commercial is skipped, the skipping process stops automatically. Since the end of the commercial group is detected by software just after the last CM has passed, the VCR runs a reverse search for a short time then returns to a normal play mode and starts a program again.
14
ICs for VCR
s Application Circuit Example
* System example
AN3275SB
AN3275SB Video Video black detection
VCR microcontroller To CLT head
CLR pulse
CA processor ROM, RAM A/D
Microcontroller
To survo/timer To front panel
Sound
Low sound detection Serial bus
* IC application circuit example
CA V FIL V IN 2.1 V[p-p] MA V FIL C TRAP ENVH DET
0.1 F 0.1 F
CA/MA SEL
MA V LEV
CA V LEV
SYNC FIL
CL CAP
VS OUT
V DET
47 F 39 pF
0.1 F 0.01 F
0.01 F
0.01 F
1.0 F
0.22 F
N.C.
2.2 F
47 k
47 k
VMD
ENVL DET 18
CA 1 000 pF MA
VMW
GND
36
26
25
24
23
22
21
35
34
33
32
31
30
29
28
27
MA CA
Clamp LPF Clamp
BP
Counter Video 1 Latch 2 MM1 V-DL MM2 V-WID
V mask ENV mask
Amp. Sync. sepa.
Black video detect V-sync. sepa.
E/V mask
H mask
MM3 H-DL MM4 H-WD
LPF3
E/V mask
V mask H mask
Amp. 2
Non-audio detect
MA
Audio 1 Latch 2
CA MA
Counter
E/V mask
Mix. 13 14 15
ENV detector 16 17
CA
10
11
2 700pF
2 200pF
12
1
2
3
4
5
6
7
8
9
MA V LEV
CA A LEV
A DET
0.01 F 39 k
0.1 F
1 000 pF
0.1 F
0.1 F
2.2 F
0.01 F
0.1 F
RA IN 1.0 V[p-p]
PA IN 0.1 V[p-p]
ENV DET
CLR OUT
PB FM IN
MA A FIL
CA A FIL
VCC
HSW IN
ENV ADJ.
47 k
CLR IN
HMW
5 V typ.
20
19
0.1 F
15

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