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BH7273KV
Datasheet (ROHM)
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Datasheet BH7273KV Datasheet (ROHM)

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Page 1
1
Video ICs
Equalizer and ATF circuit IC for Digital VCRs
BH7273KV
The BH7273KV is an equalizer and ATF circuit IC developed for use with digital video cassettes (DVC). By using this IC, it is simple to design the filter for the equalizer required for DVD sets. In addition, the ATF circuit detects the pilot signals and generates error signals.
Applications
Equalizers and ATFs for digital VCRs
Features
1) Enables the configuring of all pass filters, 1 + D cir­cuits, and transversal filters (TVF).
2) Built-in VCA, amplifier, buffer, and mixer amplifier.
3) Detects the ATF pilot signal and generates an ATF error signal.
4) Built-in 1.5MHz LPF, VCA, 465kHz BPF, 697.5kHz BPF, 25dB amplifier, peak detector, and subtractor.
5) Intermediate frequencies are variable by controlling the voltages for the 465kHz BPF and 697.5kHz BPF.
Absolute maximum ratings (Ta = 25°C)
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits Unit Applied voltage Power dissipation Operating temperature Storage temperature
V
CC
Pd Topr Tstg
7.0
∗
1000
– 20 ~ + 65
– 55 ~ + 125
V
mW
°C °C
∗
When mounted on a 70mm × 70mm × 1.6mm glass epoxy board.
∗
Reduced by 10.0mW for each increase in Ta of 1°C over 25°C.
Parameter
Symbol Min. Typ. Max. Unit Conditions
Power supply voltage V
CC 5V 4.6 4.9 5.2 V 2, 15, 21, 33, 44, 48, 60pin
䊊Not designed for radiation resistance.
Page 2
2
Video ICs BH7273KV
Block diagram
47 46 45 44 43 42 41 40 39 38 37 36 35 34 3348
60
61
62
63
64
59
58
57
56
55
54
53
52
51
50
49
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
141312 16151110987654321
DET
DET
AMP
VCA
AMP
AMP
25dB
14 / 24dB
47k 47k
SUBTRACT
697.5kHz BPF
465.0kHz BPF
1.5MHz LPF
CTRL
VCA
AMP
AMP
BF BF
Mix
BH7273KV
Vcc 4.9V
GND
F2 DET OUT
F1 DET OUT
Vcc 4.9V
SUBSTRACT OUT
OFFSET BIAS OUT
OFFSET BIAS
N.C.
GND
MIX + OUT
MIX – OUT
MIX IN2
MIX IN1
GND
Vcc 4.9V
N.C.
F1 AMP OUT
F2 AMP OUT
F2 AMP IN
F1 AMP IN
F1 BPF OUT
F2 BPF OUT
F2 adj
F1 adj
GCA OUT
GND
Vcc 4.9V
GAIN adj
GAIN SW
ATF IN
GND
N.C.
N.C.
N.C.
N.C.
BF OUT2
BF OUT1
BF IN
GND
TVF2AMP OUT
TVF2AMP – IN
TVF2AMP + IN
Vcc 4.9V
GND
TVF1AMP OUT
TVF1AMP – IN
TVF1AMP + IN
SLEEP CTRL
Vcc 4.9V
BIAS FILTER
BF2 IN
BF2 OUT
APF1AMP + IN
APF1AMP – IN
APF1AMP OUT
DRIVER IN
DRIVER OUT
GND
TVF1VCA + IN
TVF1CTRL
TVF1VCA OUT
Vcc 4.9V
GND
Vcc-GND pin table
Pin No. Pin name Function
2
11
V
CC 4.9V
GND
All pass filter for pins 3 to 10 Same as above
15 16
VCC 4.9V
GND
12-14pin VCA, 17-19pin AMP Same as above
33 34
VCC 4.9V
GND
35-38pin MIX AMP 35-38pin MIX AMP
44 39
VCC 4.9V
GND
Detector, subtractor circuit Same as above
48 47
VCC 4.9V
GND
BPF, 25dBAMP Same as above
60 59
VCC 4.9V
GND
LPF, GCA Same as above
64 GND
N.C. (Connected to GND to lower impedance)
21 20 25
V
CC 4.9V
GND GND
22-24pin AMP, 26-28pin BUFF 22-24pin AMP 26-28pin BUFF
∗
Make sure that Vcc and GND do not sway.
∗
Separate the equalizer and ATF grounds.
∗
Since the gain of the ATF circuit is high, make sure that there is no return from the output to input.
Page 3
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Video ICs BH7273KV
Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 4.9V, f = 4.0MHz)
Parameter
Symbol
Min. Typ. Max.
Unit Conditions
Voltage gain
Frequency characteristics
〈VCA〉
〈TVF AMP〉
Voltage gain
Voltage gain
Frequency characteristics
G
VA
∆G
VA
– 3.0
– 3.0
± 0.0
± 0.0
+ 3.0 dB
dB
Input at pin 4 = 300mV
P-P
Measure output at pin 10 f = 8.0 / 1.0MHz, V
IN
= 300mV
P-P
Output level difference for pin 10
G
VV1
G
VV2
∆G
VV
– 1.0
—
– 3.0
– 28.0
—
—
dB
dB
dB
Input at pin 12 = 150mV
P-P
, pin 13 = 3.0V
Measure output at pin 14 Input at pin 12 = 150mV
P-P
, pin 13 = 0.25V
Measure output at pin 14 f = 8.0 / 1.0MHz, V
IN
= 150mV
P-P
Output level difference for pin 14; pin 13 = 3.0V
Voltage gain
Frequency characteristics
G
VT
∆G
VT
– 3.0 ± 0.0
9.9
—
dB
dB
Input at pins 17, 18, 22, and 23 = 150mV
P-P
Measure output at pins 19 and 24 f = 8.0 / 1.0MHz, V
IN
= 150mV
P-P
Output level difference for pins 19 and 24
〈BUFF AMP〉 Voltage gain
Frequency characteristics
G
VB
∆G
VB
– 4.2
– 3.0
– 1.2
± 0.0
—
—
dB
dB
Input at pin 26 = 300mV
P-P
Measure output at pins 27 and 28 f = 8.0 / 1.0MHz, V
IN
= 300mV
P-P
Output level difference for pins 27 and 28
Quiescent current Quiescent current [Equalizer block] 〈All pass filter〉
Iq
Iq
(S)
— —
63 16
100
30
mAmANo signal
No signal, sleep mode
—
– 12.0
〈MIX AMP〉 Voltage gain
Frequency characteristics [ATF block] VCA voltage gain 1
VCA voltage gain 2
465.0kHz BPF voltage gain
697.5kHz BPF voltage gain
G
VM
∆G
VM
5.0 8.0
0.0
11.0
—
dB
dB
ATF OUT output level 1 V
ATF1
1.30 1.50 1.70 V
Input at pins 35 and 36 = 150mV
P-P
Measure output at pins 37 and 38 f = 8.0 / 1.0MHz, V
IN
= 150mV
P-P
Output level difference for pins 37 and 38
G
VF1
G
VF2
G
VB1
G
VB2
11
21
44
44
14
24
48
48
17
27
52
52
dB
dB
dB
dB
ATF OUT output level 2
ATF OUT output level 3
V
ATF2
V
ATF3
1.50
0.60
1.80
0.90
2.10
1.20
V
V
Input at pin 63 = 2.0mV
P-P
, pin 62 = low
Measure output at pin 58, f = 697.5kHz Input at pin 63 = 2.0mV
P-P
, pin 62 = high
Measure output at pin 58, f = 697.5kHz Input at pin 63 = 0.3mV
P-P
, pin 62 = high
Measure output at pin 50, f = 465.0kHz Input at pin 63 = 0.3mV
P-P
, pin 62 = high
Measure output at pin 51, f = 697.5kHz
50pin = 100mV
P-P
51pin = 300mV
P-P
, 41pin = 1.5V
50pin = 500mV
P-P
51pin = 100mV
P-P
, 41pin = 1.5V
No signal
[Logic block] SLEEP hold voltage SLEEP hold voltage VCA gain switch low VCA gain switch high
V
TH1H
V
TH1L
V
TH62L
V
TH62H
2.0
0.0
0.0
2.0
— — — —
4.9
1.0
1.0
4.9
V V V V
Pin 1 voltage for SLEEP mode Pin 1 voltage for SLEEP mode Pin 62 voltage for ATF VCA gain to be low Pin 62 voltage for ATF VCA gain to be high
– 3.0
± 0.0
2.0
3.9 6.9
Page 4
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Video ICs BH7273KV
Measurement circuit
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60
61
62
63
64
59
58
57
56
55
54
53
52
51
50
49
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
141312 16151110987654321
DET
DET
AMP
VCA
AMP
AMP
25dB
14 / 24dB
47k 47k
SUBTRACT
697.5kHz BPF
465.0kHz BPF
1.5MHz LPF
CTRL
VCA
AMP
AMP
BF BF
MIX
BH7273KV
Fig. 1
Vcc 4.9V
ATF OUT
Offset BIAS
MIX OUT
MIX OUT
MIX IN
MIX IN
465.0kHz BPF OUT
697.5kHz BPF OUT
BUFF OUT
BUFF OUT
BUFF IN
TVF AMP OUT
TVF AMP IN
TVF AMP IN
TVF AMP IN
TVF AMP IN
TVF AMP OUT
Vcc 4.9V Vcc 4.9V
Vcc 4.9V
1000p
∗
2.2k
0.1µ
0.1µ
0.1µ
0.1µ
f2 adj
f1 adj
ATF VCA OUT
0.1µ
0.1µ 0.1µ
1000p
∗
0.1µ
300
300
600
600
0.1µ
0.1µ
0.1µ
0.1µ
0.1µ
0.1µ
0.1µ
0.1µ
0.1µ
0.1µ0.1µ
600
470
1k47p
300
33p
0.1µ
Vcc 4.9V
Vcc 4.9V
Vcc 4.9V
Gain adj
Gain SW
ATF IN
SLEEP
VCA OUTAPF OUT VCA INAPF IN
Page 5
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Video ICs BH7273KV
Input / output circuits
Pin No. Pin name Internal circuitPin voltage Function
1 SLEEP CTRL
Sleep control
0.0
3
BIAS FILTER
Filter for BF amplifier bias of pins 4 and 5
2.2
8
APF1 AMP OUT
APF amplifier output
15k
35k
15k
100k
VCC 5V —
— —
—
— —
—2
V
CC for all pass filter of pins 3 to10
22k
21k
20k
3
4 5
BF2 IN
BF2 OUT
Buffer amplifier input Buffer amplifier output
3.0
2.2
6 7
APF1 AMP + IN APF1 AMP – IN
APF amplifier positive input APF amplifier negative input
9
10
DRIVER IN
DRIVER OUT
Driver input Driver output
5k
150
4
5
9
10
6 7
8
1
Page 6
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Video ICs BH7273KV
Pin No. Pin name Internal circuitPin voltage Function
12
TVF1 VCA + IN
TVF1 VCA positive input
2.2
13 TVF1 CTRL
TVF1 VCA gain control
0.0
14
TVF1 VCA OUT
TVF1 VCA positive output
15 V
CC 5V
V
CC for VCA of pins 12 to 14 and for
amplifier of pins 17 to 19
1.7
12
1k
5k
15k
5k
5k
13
17
400
5k
18
5k
400 400
14
16 GND
GND for VCA of pins 12 to 14 and for amplifier of pins 17 to 19
11 GND — —
——
——
GND for all pass filter of pins 3 to 10
17 18
TVF1 AMP + IN TVF1 AMP – IN
TVF1 amplifier positive input TVF1 amplifier negative input
2.2
2.2
Page 7
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Video ICs BH7273KV
Pin No. Pin name Internal circuitPin voltage Function
20 GND ——
——
——
GND for amplifier of pins 22 to 24
24
TVF2 AMP OUT
TVF2 amplifier output
2.7
26 27 28
BF IN BF OUT1 BF OUT2
BF input BF output 1 BF output 2
2.1
1.3
1.3
22
400
5k
5k
23
5k
24
27 28
25 GND
GND for BF of pins 26 to 28
21 V
CC 5V
V
CC for amplifier of pins 22 to 24 and
for BF of pins 26 to 28
22 23
TVF2 AMP + IN TVF2 AMP – IN
TVF2 amplifier positive input TVF2 amplifier negative input
2.2
2.2
26
19
TVF1 AMP OUT
TVF1 amplifier output
2.7
19
Page 8
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Video ICs BH7273KV
Pin No. Pin name Internal circuitPin voltage Function
V
CC 5V33
V
CC for VCA of pins 30 to 32 and MIX
amplifier of pins 35 to 38
GND34
GND for MIX amplifier of pins 35 to 38
——
——
—
35 36
MIX IN1 MIX IN2
MIX amplifier input 1 MIX amplifier input 2
2.2
2.2
5k
35
5k
36
———
29 30 31 32
N.C.
GND39
GND for detector, subtractor, and reverse polarity circuits
N.C.40
—
—
—— —
37 38
MIX – OUT MIX + OUT
MIX amplifier output 1 MIX amplifier output 2
3.2
3.2
37 38
Page 9
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Video ICs BH7273KV
Pin No. Pin name Internal circuitPin voltage Function
42
OFFSET BIAS
OUT
Bias output
1k
1k
44 VCC 5V —
—
—
V
CC for detector, subtractor, and
reverse polarity circuits
2.5
42
43
SUBTRACT
OUT
ATF output
43
15k
47k
47 GND — —
——
GND for BPF and 25dB amplifier
48 V
CC 5V
V
CC for BPF and 25dB amplifier
— —
46
15k
47k
45
45 46
F1DET OUT F2DET OUT
F1 detector F2 detector
OFFSET BIAS
41
Bias adjustment
1.5
15k
35k 14k
4k
41
Page 10
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Video ICs BH7273KV
Pin No. Pin name Internal circuitPin voltage Function
54 55
F1BPF OUT F2BPF OUT
F1 BPF output F2 BPF output
2.5
2.5
54 55
50 51
F1AMP – OUT F2AMP – OUT
F1 amplifier output F2 amplifier output
2.1
2.1
50 51
52
200
5k
53
200
5k
52 53
F2AMP IN F1AMP IN
F2 amplifier input F1 amplifier input
2.3
2.3
58
56 F2 ADJ
F2 adjustment
1.5
57 F1 ADJ
F1 adjustment
1.5
58 GCA OUT
VCA output
1.8
35k
70k
30k
56
35k
70k
30k
57
—— —
49 N.C.
Page 11
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Video ICs BH7273KV
Pin No. Pin name Internal circuitPin voltage Function
62 GAIN SW
VCA gain switching
0.0
62
15k
35k
15k
100k
VCC 5V — —60
V
CC for LPF and VCA
GAIN ADJ61
VCA gain adjustment
1.5
35k
70k
30k
1k 1k
61
63 LPF IN
LPF input
3.8
5k
63
N.C. — —64
N.C. pin Connect to ground to lower impedance
——
GND59
GND for LPF and VCA
Page 12
12
Video ICs BH7273KV
Application example
47 46 45 44 43 42 41 40 39 38 37 36 35 34 3348
60
61
62
63
64
59
58
57
56
55
54
53
52
51
50
49
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
141312 16151110987654321
DET
DET
AMP
VCA
AMP
AMP
25dB
14 / 24dB
47k 47k
SUBTRACT
697.5kHz BPF
465.0kHz BPF
1.5MHz LPF
CTRL
VCA
AMP
AMP
BF BF
MIX
BH7273KV
Vcc 4.9V
ATF OUT
Offset BIAS
EQ + OUT
EQ – OUT
Vcc 4.9V
1000p
∗
2.2k
0.1µ
0.1µ
0.1µ
0.1µ
f2 adj
f1 adj
0.1µ
0.1µ 0.1µ
1000p
∗
0.1µ
0.1µ 0.1µ
0.1µ
300
300
470
1k47p
300
33p
0.1µ
Vcc 4.9V
Vcc 4.9V
Vcc 4.9V
Vcc 4.9V
Gain adj
Gain SW
ATF IN
SLEEP
EQ IN
Vcc 4.9V
150
180
150
150
Delay Line
Delay Line
0.1µ
0.1µ
0.1µ
300 300
0.1µ
0.1µ
0.1µ
0.1µ
Delay Line
Fig. 2
Page 13
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Video ICs BH7273KV
VQFP64
48 33
32
17
16
1
49
64
10.0 ± 0.2
12.0 ± 0.3
10.0 ± 0.2
12.0 ± 0.3
0.2 ± 0.1
0.1
0.5
0.125 ± 0.1
0.5
0.10
1.4 ± 0.1
External dimensions (Units: mm)
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