PANASONIC AN3275SB

ICs for VCR
AN3275SB
CM detection IC for VCRs in the North American market
■ Overview
Unit: mm
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.
+0.10
15.2±0.3
0.2–0.05
19
1
18
0.5
8.4±0.3
11.93±0.3
36
■ Features
1.30±0.25
1.30±0.25
0.3±0.11
0.8
Seating plane
0.1±0.1
2.85±0.2
• 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
SSOP036-P-0450A
■ Applications
• Stand-alone VCR
ENVL DET
19
ENVH DET
20
VMD
21
VMW
22
23
VS OUT
SYNC FIL
24
V DET
25
26
N.C.
MA V LEV
27
28
MA V FIL
CA V LEV
29
CA V FIL
30
CL CAP
31
C TRAP
32
33
34
V IN
CA/MA SEL
35
36
GND
■ Block Diagram
MA
CA
Counter
Clamp
LPF
BP
H mask
Black video
detect
Amp.
Clamp
V-sync.
sepa.
Sync.
sepa.
MM3
H-DL
MM4
H-WD
V mask H mask
LPF3
MM1
V-DL
E/V mask
E/V mask
MM2
V-WID
Audio 1
Latch 2
Non-audio
detect
Amp. 2
Video 1
Latch 2
V mask
CA
ENV mask
MA
Counter
MA
Mix.
ENV detector
CA
Note)
18
17
ENV ADJ.
16
HSW IN
15
PB FM IN
14
ENV DET
13
CLR OUT
12
CLR IN
11
A DET
10
9
CA A LEV
8
CA A FIL
7
MA A FIL
6
MA V LEV
5
4
PA IN
3
RA IN
2
HMW
VCC
1
E/V mask
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.
1
AN3275SB
ICs for VCR
■ Pin Descriptions
Pin No.
Symbol
1
VCC
2
HMW
H-mask width period adjustment
3
RA IN
Audio recording input
4
PA IN
Audio playback input
5
A FIL
Audio filter
21
VMD
V-mask time delay adjustment
6
MA A LEV
V-mask width period adjustment
7
Description
Pin No.
Symbol
19
ENV L DET
Supply voltage (5 V typ.)
MA A FIL
CA A FIL
20
ENV H DET
CA A LEV
10
A DC
MOVIE ADVANCE audio
22
VMW
detection level adjustment
23
VS OUT
MOVIE ADVANCE audio
24
SYNC FIL
11
A DET
Vertical sync. signal output
Vertical sync. signal separation
filter
COMMERCIAL ADVANCE
25
V DET
Black picture detection output
to a microcomputer
COMMERCIAL ADVANCE
26
N.C
audio detection level adjustment
27
MA V LEV
No connection
MA video detection level
adjustment
Audio DC
PB FM envelope peak
detection (upper)
audio filter
9
PB FM envelope peak
detection (below)
filter
8
Description
Audio detection latch output
28
MA V FIL
to a microcomputer
29
CA V LEV
MA video filter control
CA video detection level
adjustment
12
CLR IN
E/V mask pulse input
13
CLR OUT
E/V mask pulse output
30
CA V FIL
CA video filter control
14
ENV DET
PB FM envelope detection filter
31
CL CAP
Capacitor for clamping
15
PB FM IN
PB FM envelope input
32
C TRAP
Chroma trap filter
16
HEAD
Head amp. switch pulse input
33
VIN
34
A REF
35
CA/MA SEL
AMP SW
17
ENV ADJ.
ENV mask level adjustment
18
V DET OUT
Video detection delay
adjustment
Video input
Audio reference
Selection of CA, MA
(CA-LITE)
36
GND
Signal processing circuit GND
■ Absolute Maximum Ratings
Parameter
Supply voltage
Supply current
Power dissipation
*2
Operating ambient temperature
Storage temperature
*1
*1
Symbol
Rating
Unit
VCC
5.5
V
ICC
35
mA
PD
450
mW
Topr
−20 to +70
°C
Tstg
−55 to +125
°C
Note) *1: Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C.
*2: The power dissipation shown is for the IC package at Ta = 70°C.
2
ICs for VCR
AN3275SB
■ Recommended Operating Range
Parameter
Supply voltage
Symbol
Range
Unit
VCC
4.75 to 5.25
V
■ Electrical Characteristics at VCC = 5.0 V, Ta = 25°C
Parameter
Supply current
Symbol
ICC
Conditions
MA mode
Min
Typ
Max
Unit

21
28
mA
CA mode hold voltage
V35H

3.5

5.0
V
CL SLP mode hold voltage
V35M

1.75

3.0
V
CL SP,MA mode hold voltage
V35L

0

1.25
V
Pin 32 output impedance
R32

1 830 2 030 2 230
Ω
Pin 5 output impedance
R5

4 505 5 005 5 505
Ω
VSS pulse high level
V23H
Outoput 23, with 10 kΩ to GND
4.0


V
VSS pulse low level
V23L
Outoput 23, with 10 kΩ to VCC


0.5
V
CLR pulse high level
V13H
Outoput 13, with 10 kΩ to GND
4.0


V
CLR pulse low level
V13L
Outoput 13, with 10 kΩ to VCC


0.5
V
Video det. output high level
V25H
Outoput 25, with 10 kΩ to GND
4.0


V
Video det. output low level
V25L
Outoput 25, with 10 kΩ to VCC


0.5
V
Audio det. output high level
V11H
Outoput 11, with 10 kΩ to GND
4.0


V
Audio det. output low level
V11L
Outoput 11, with 10 kΩ to VCC


0.5
V
Black det. level 1 (CA mode) *1
VDET1
Input 33, output 25
Video signal: 140IRE = 2.1 V[p-p]
10.5
13
15.5
(IRE)
Black det. level 2 (CA mode) *1
VDET1
Input 33, output 25
Video signal: 140IRE = 2.1 V[p-p]
8.5
11
13.5
(IRE)
Non-audio detection level 1
(CA mode)
ADET1
Input 3, output 11
Pin 7: 47 kΩ to GND, fIN = 1.0 kHz
56
76
96
mV[p-p]
Non-audio detection level 2
(MA mode)
ADET2
Input 4, output 11
Pin 7: 47 kΩ to GND, fIN = 5 kHz
1.8
3.6
5.4
mV[p-p]
Black detection adjustment
range 1 *1
VAD1
Input 33, output 25, pin 29 = DC,
sweep: 140 IRE = 2.1V[p-p]
7

28
(IRE)
Black detection adjustment
range 2 *1
VAD2
Input 33, output 25, pin 27 = DC,
sweep: 140 IRE = 2.1V[p-p]
7

28
(IRE)
Non-audio
detection adjustment range 1
AAD1
Input 3, output 11
Pin 9 = DC, sweep, fIN = 1.0 kHz
50

100 mV[p-p]
Non-audio
detection adjustment range 2
AAD2
Input 4, output 11
Pin 6 = DC, sweep, fIN = 5 kHz
2.4

5.2
mV[p-p]
V-mask delay
tVD
Input 33, output 13
Delay from VSS: 0.1 uF, pin 21: 0.1 µF
1.65
1.95
2.25
ms
V-mask width
tVW
Input 33, output 13, pin 22: 0.22 µF
11
12.5
14
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
ICs for VCR
■ Electrical Characteristics at VCC = 5.0 V, Ta = 25°C (continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
H-mask delay
tHD
Input 33, output 30, delay from HSS
10.5
12.5
14.5
µs
H-mask width
tHW
Input 33, output 30, pin 2: 2 700 pF
30
34
38
µs
ENV detection level
SE
Input 15, output 13,
VIN = 200 mV[p-p]
− 5.5
− 7.5
− 9.5
dB
• Design reference data
Note) The characteristics below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
VSY33
Input 33, output 33
Pin 33: 1.0 µF, 140IRE = 2.1 V[p-p]

1.8

V
Chroma trap frequency
characteristics
fV2
Input 33, output 30
Ratio of pin 30 = 500 kHz to 3.58 MHz

− 35

dB
LPF2 frequency characteristics
fV3
Input 33, output 30
Ratio of pin 30 = 500 kHz to 1.0 MHz

− 3.0

dB
Pin 30 output dynamic range *1
V30
Input 33, output 30
Pin 30: 10 kΩ to GND

30

(IRE)
VPD30
Input 33, output 30
Pin 30: 10 kΩ to GND

1.6

V
V28
Input 33, output 28
Pin 28: 10 kΩ to GND

30

(IRE)
Pin 28 pedestal DC level
VPD28
Input 33, output 28
Pin 28: 10 kΩ to GND

1.6

V
Masking level DC offset
∆VPD
Input 33, output 28
− 2.0
Pin 28: 10 kΩ to GND, pin 2 = GND
0.0
0.2
V
Black detection hysteresis
∆VVCN
Input 28, output 18
Pin 28 = triangular wave
105
130
155 mV[p-p]
Black detection block
Pin33 sync. DC level
Pin 30 pedestal DC level
Pin 28 output dynamic range *1
HSS,VSS block
Sync. separation minimum input
sensitivity
SHSS
Input 33, output 24
Pin 33: VIN = 2.1 V[p-p], white 100%

40

%
HSS front edge delay
tDHSS
HSS front edge delay from
input 33, output 24, pin 33

1.0

µs
VSS front edge delay
tDVSS
Input 33, output 23

25

µs
VSS pulse width
tWVSS
Input 33, output 23

215

µs
Non-audio detection block
LPF3 frequency characteristics
fA1
Input 4, output 7
Ratio of pin 7 = 5 kHz to 15 kHz

−3

dB
Pin 7 output dynamic range
∆V7
Input 4, output 7

5.0

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
AN3275SB
■ Electrical Characteristics at VCC = 5.0 V, Ta = 25°C (continued)
• Design reference data (continued)
Note) The characteristics below are theoretical values based on the IC design and are not guaranteed.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Envelope detection block
EAD
Input 15, output 13
VIN = pin 15, 200 mV[p-p]
−3

+3
dB
∆VENON
Input 15, output 13
VIN = pin 15, 200 mV[p-p]

1.7

dB
ENV detection adjustment range
ENV detection hysteresis
SP ENV pulse front edge delay
tDHSW
Input 16, output 13
VIN = rectangular wave, 0 V to 5 V 300 Hz

0.4

µs
SP ENV pulse width
tWSHW
Input 16, output 13
VIN = rectangular wave, 0 V to 5 V 300 Hz

570

µs
∆VHSON
Input 16, output 13
VIN = triangular wave, 2 V[p-p] 300 Hz

80

mV[p-p]
SP ENV pulse hysteresis
■ Terminal Equivalent Circuits
Pin No.
Equivalent circuit
1
VCC
2
HMW
Impedance
Signal waveform
DC (V)


5.0
Current output
3.5 V

0V
2
200 Ω
HSS
HSS on
3
RA IN (CA)
10 kΩ
200 Ω
10 kΩ
2.3
Sin wave
3
5
AN3275SB
ICs for VCR
■ Terminal Equivalent Circuits (continued)
Pin No.
4
Equivalent circuit
PA IN (MA, CL)
Impedance
Signal waveform
10 kΩ
200 Ω
10 kΩ
DC (V)
2.3
Sin wave
4
5
5005 Ω
A FIL
1.5
5 005 Ω
200 Ω
2 kΩ
5
6
MAALEV
21 kΩ
DC
2.1
70 kΩ
6
200 Ω
30 kΩ
7
MAAFIL

Current output
i
200 Ω
0V
7
6
(R GND)
ICs for VCR
AN3275SB
■ Terminal Equivalent Circuits (continued)
Pin No.
8
Equivalent circuit
CAAFIL
80 kΩ
Low at CA
9
Impedance
Signal waveform
DC (V)
Tr-C
DC
CA 0 V
MA open
19 kΩ
DC
2.1
10 kΩ
DC
2.8
8
20 kΩ
CAALEV
75 kΩ
9
200 Ω
25 kΩ
10
A DC
10 kΩ 200 Ω
10
11
A DET
Tr-C

11
7
AN3275SB
ICs for VCR
■ Terminal Equivalent Circuits (continued)
Pin No.
12
Equivalent circuit
CLR IN
Impedance
Signal waveform
DC (V)
Tr-B
0
Tr-C

2.0 kΩ
1.0
20 kΩ
2.7
10 kΩ 200 Ω
12
500 Ω 30 kΩ
13
CLR OUT
13
14
ENVDET
2 kΩ 200 Ω
14
15
PB FM IN
200 Ω
20 kΩ
15
8
ICs for VCR
AN3275SB
■ Terminal Equivalent Circuits (continued)
Pin No.
16
Equivalent circuit
HEAD AMP SW
Impedance
Signal waveform
11 kΩ
3 600 Ω
DC (V)
1.3
200 Ω
8 400 Ω
16
17
ENV ADJ.
25 kΩ
DC
2.7
45 kΩ
17
55 kΩ
18
V DET OUT
Tr-B
0
200 Ω
3.3
18
70 kΩ
500 Ω
10 kΩ
7 pF
MA on
19
ENV L DET
200 Ω
200 Ω
19
9
AN3275SB
ICs for VCR
■ Terminal Equivalent Circuits (continued)
Pin No.
20
Equivalent circuit
ENV H DET
200 Ω
Impedance
Signal waveform
DC (V)
200 Ω
1.8
Current output

200 Ω
20
21
VMD
3.5 V
0V
21
200 Ω
VSS on
VSS
22
VMW

Current output
3.5 V
0V
22
200 Ω
MMI on
VSS
23
VS OUT
Tr-C
23
10

ICs for VCR
AN3275SB
■ Terminal Equivalent Circuits (continued)
Pin No.
24
Equivalent circuit
SYNC FIL
2 100 Ω
Impedance
Signal waveform
DC (V)
2 100 Ω
1.5
Tr-C

200 Ω
24
25
V DET
25
26
N.C.
27
MA V LEV



25 kΩ
DC
2.6
1 000 Ω
DC
Pedestal
1.8
47 kΩ
27
200 Ω
53 kΩ
28
MA V FIL
1 000 Ω
200 Ω
28
11
AN3275SB
ICs for VCR
■ Terminal Equivalent Circuits (continued)
Pin No.
29
Equivalent circuit
CA V LEV
Impedance
Signal waveform
DC (V)
25 kΩ
DC
2.9
200 Ω
DC
Pedestal
1.8
Push-pull
DC
3.0
49 kΩ
29
200 Ω
51 kΩ
30
CA V FIL
200 Ω
200 Ω
30
31
CL CAP
31
i
32
2 030 Ω
CTRAP
2 030 Ω
32
12
200 Ω
Sync.
1.8
ICs for VCR
AN3275SB
■ Terminal Equivalent Circuits (continued)
Pin No.
33
Equivalent circuit
Impedance
V IN
Signal waveform
Tr-E
DC (V)
Sync.
1.8
200 Ω
200 Ω
33
34
A REF (AUDIO reference)
25 kΩ
DC
2.9
25 kΩ
DC
2.5



43 kΩ
200 Ω
57 kΩ
34
35
CA/MA SEL
35
200 Ω
50 kΩ
10 kΩ
50 kΩ
36
GND
13
AN3275SB
ICs for VCR
■ Reference
• 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
AN3275SB
■ Application Circuit Example
• System example
AN3275SB
VCR microcontroller
Video
black detection
Video
To CLT head
CA processor
ROM, RAM
A/D
CLR pulse
Microcontroller
To survo/timer
To front panel
Low sound
detection
Sound
Serial bus
19
0.1 µF
ENVL DET
ENVH DET
20
0.1 µF
0.1 µF
21
22
23
0.22 µF
VMD
VMW
VS OUT
SYNC FIL
24
25
N.C.
26
47 kΩ
27
28
0.01 µF
V DET
MA V LEV
MA V FIL
CA V LEV
47 kΩ
29
0.01 µF
CA V FIL
30
CL CAP
31
32
0.1 µF
0.01 µF
C TRAP
47 µF 39 pF
V IN 2.1 V[p-p]
1.0 µF
33
34
35
36
2.2 µF
CA/MA SEL
GND
• IC application circuit example
MA
CA
Counter
Clamp
BP
H mask
Black video
detect
Amp.
Clamp
LPF
V-sync.
sepa.
Sync.
sepa.
MM3
H-DL
MM4
H-WD
V mask H mask
LPF3
MM1
V-DL
E/V mask
E/V mask
MM2
V-WID
Audio 1
Latch 2
Non-audio
detect
Amp. 2
Video 1
Latch 2
V mask
CA
ENV mask
MA
Counter
MA
Mix.
ENV detector
CA
18
CA 1 000 pF
MA
17
ENV ADJ.
16
HSW IN
0.01 µF 39 kΩ
15
0.1 µF
PB FM IN
14
ENV DET
1 000 pF
13
CLR OUT
12
CLR IN
10
11
A DET
CA A LEV
47 kΩ
CA A FIL
2.2 µF
9
8
0.1 µF
7
0.01 µF
MA A FIL
6
MA V LEV
5
2 200pF
0.1 µF
4
PA IN 0.1 V[p-p]
3
0.1 µF
2
HMW
RA IN 1.0 V[p-p]
VCC
5 V typ.
2 700pF
1
E/V mask
15