ROHM BH7273KV Datasheet

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.

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.

3

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

4

Video ICs BH7273KV

•

Measurement circuit

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

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