ROHM BA7657S, BA7657F Datasheet

1

Multimedia ICs

Input selector switch for high
definition displays

BA7657F / BA7657S

The BA7657F and BA7657S are for high definition displays, and have internal switches for switching between broad­band RGB signals and HD / VD signals, as well as an internal synchronization separator. These ICs simplify the de­signing of input units for deluxe displays.

•

Applications

CRT display, HDTV, video board for personal computer, etc.

•

Features

1) Operates on a single 5V power supply.

2) Internal broadband RGB switch (frequency charac­teristics: 230MHz, – 3dB).

3) Internal HD / VD switch.

4) Internal synchronization separator for synchronizing
signals superimposed onto G signals.

•

Absolute maximum ratings (Ta = 25°C)

•

Recommended operating conditions (Ta = 25°C)

Parameter Symbol Limits Unit

Power supply voltage V

CC 8.0 V

Power
dissipation

BA7657F 550

∗

mW

BA7657S 1200

∗

Operating temperature Topr °C
Storage temperature Tstg °C

Pd

– 25 ~ + 75
– 55 ~ + 125

∗

Reduced by 5.5mW (BA7657F) or 12mW (BA7657S) for each increase in Ta of 1°C over 25°C.

Parameter Symbol Min. Typ. Max. Unit

Power supply voltage V

VCC 4.5 5.0 5.5

2

Multimedia ICs BA7657F / BA7657S

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Block diagram

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

1

2

1

2

1

2

1

2

1

2

DET

Logic

Syncsepa

Ground

Ground

Ground

Ground

V

CC

CTL (H: IN1, L: IN2)

Red 1 input

Green 1 input

Blue 1 input

Red 2 input

Green 2 input

Blue 2 input

VD 1 input VD 2 input

VD output

Blue output

Composite sync output

Composite video input (Sync on Green)

Green output

Red output

HD output

HD 2 input

HD 1 input

HD Sync signal detector

3

Multimedia ICs BA7657F / BA7657S

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Pin descriptions

Pin name

1 Red 1 input Color signal R1 input
2

detector

HD Sync signal Detecting phase of the synchronization

signal detector circuit
3 Green 1 input Color signal G1 input
4 Ground Ground
5 Blue 1 input Color signal B1 input
6 Ground Ground
7 Red 2 input Color signal R2 input
8 Ground Ground
9 Green 2 input Color signal G2 input

10 Ground Ground
11 Blue 2 input Color signal B2 input

VD 1 input Vertical synchronization signal VD1 input

14 VD output Vertical synchronization signal VD output
15 Blue output Color signal B output
16 Control Control (high = IN1, low = IN2)

17

output

Composite sync

Synchronization signal output

18

input

Composite video

Composite signal input

(Sync on Green)
19 Green output Color signal G output
20 V

CC

Power supply
21 Red output Color signal R output
22 HD output Horizontal synch. signal HD output
23 HD 2 input Horizontal synch. signal HD2 input
24 HD 1 input Horizontal synch. signal HD1 input

Pin name

13 VD 2 input Vertical synchronization signal VD2 input

Function Pin No. FunctionPin No.

12

•

Output selection setting table

CTL R G B HD VD

H IN1 IN1 IN1 IN1 IN1
L IN2 IN2 IN2 IN2 IN2

•

Input / output circuits

1, 3, 5
7, 9, 11pin

6.8k

21k

1k

100

VCC

R. G. B input

15, 19, 21pin

400

50

5mA

VCC

R. G. B output

12, 13

23, 24pin

15k

35k

1k

50k

V

CC

HD. VD input

4

Multimedia ICs BA7657F / BA7657S

14, 22pin

100

1.2k

2.0k

V

CC

15k

660

HD. VD output

16pin

1k

50k

35k

15k

VCC

Control

2pin

25k

25k

V

CC

from HD out to sync sepa

HD sync signal detector

18pin

25k

25k 50µA

VCC

100

from DET out

Composite Video input

17pin

VCC

Composite Sync output

5

Multimedia ICs BA7657F / BA7657S

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Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V)

Parameter Symbol Min. Typ. Max.

Unit

Conditions Measurement circuit

Maximum output level V

om

——V

P-P

f = 1kHz Fig.1

Voltage gain G

V

–

1.0

–

0.5 0 dB f = 1MHz, VIN = 1V

P-P

Fig.1

Input pin voltage gain deviation

∆G

VI

–

0.2 0 0.2 dB f = 1MHz, VIN = 1V

P-P

Fig.1

Block voltage gain deviation

∆G

VB

–

0.2 0 0.2 dB f = 1MHz, VIN = 1V

P-P

Fig.1

Input pin crosstalk 1 CTI1 —

–

50

–

40 dB f = 10MHz, VIN = 1V

P-P

Fig.2

Block crosstalk 1 CTB1 —

–

50

–

40 dB f = 10MHz, VIN = 1V

P-P

Fig.2

〈

Digital switch unit

〉

Input high level voltage

〈

Analog switch unit

〉

1.8 — — V Fig.1
Input low level voltage — — 1.2 V Fig.1
Input high level current 80 100 130 µAV

IN

= 5.0V Fig.1

Input low level current — µAV

IN

= 0V Fig.1

Rise time T

R

— 30 50 ns Fig.1
Fall time — 30 50 ns Fig.1
Rise delay time — 50 80 ns Fig.1
Fall delay time — 30 50 ns Fig.1
Output high level voltage 3.0 3.7 — V Fig.1
Output low level voltage — 0.2 0.4 V Fig.1
Output high level current

–

3

–

1

–

400

——µA Fig.1

Output low level current 5 — — mA Fig.1

〈

SYNC separation unit

〉

Minimum SYNC
separation level

V

SMin.

—mV

P-P

Fig.1

Output high level voltage 4.5 5.0 — V Fig.1
Output low level voltage — 0.2 0.5 V Fig.1
Output low level current 2 — — mA Fig.1
Rise time T

R

— 80 130 ns Fig.1
Fall time T

F

— 30 80 ns Fig.1
Rising delay time T

RD

— 100 150 ns Fig.1
Fall delay time T

FD

— 100 150 ns Fig.1

〈

Control unit〉
Output high level voltage 1.8 — — V Fig.1
Output low level voltage — — 1.2 V Fig.1
Output high level current 80 100 130 µAV

IN

= 5.0V Fig.1

Output low level current — µAV

IN

= 0V Fig.1

V

IH

V

IL

I

IH

I

IL

T

F

T

RD

T

FD

V

OH

V

OL

I

OH

I

OL

V

OH

V

OL

I

OL

V

IH

V

IL

I

IH

I

IL

Quiescent current I

CC

20 35 50 mA Fig.1

2.8

50

–

3

–

1

–

50

6

Multimedia ICs BA7657F / BA7657S

•

Guaranteed design parameters (unless otherwise noted, Ta = 25°C, VCC = 5.0V)

Parameter

Symbol

Min. Typ. Max.

Unit

Conditions Measurement circuit

Input pin crosstalk 2

〈

Analog switch unit

〉

CTI2 — dB Fig.2
Block crosstalk 2 CTB2 — dB Fig.2
Frequency characteristic deviation

Gf dB Fig.2

Input pin frequency characteristic deviation

∆GfI 0 dB Fig.2

Block frequency characteristic deviation

∆GfB 0

–

30– 15

–

30– 15

–

6

–

3

–

1

–

1

+

1

–

1

+

1

dB Fig.2

f = 230MHz, V

IN

= 1V

P-P

f = 230MHz, VIN = 1V

P-P

f = 1MHz / 230MHz, VIN = 1V

P-P

f = 1MHz / 100MHz, VIN = 1V

P-P

f = 1MHz / 100MHz, VIN = 1V

P-P

SYNC separation frequency

fH-R 200 — — kHz input waveform

∗

1

Fig.3

SYNC separation pulse width 1

pwH1 3.0 — — µs input waveform

∗

2

fH = 20kHz Fig.3

SYNC separation pulse width 2

pwH2 0.5 — — µs input waveform

∗

2

fH = 100kHz Fig.3

SYNC separation pulse width 3

pwH3 0.3 — — µs input waveform

∗

2

fH = 200kHz Fig.3

SYNC separation level 1

〈

SYNC separation unit

〉

VS1 300 — — µs input waveform

∗

3

fH = 20kHz Fig.3

SYNC separation level 2

VS2 100 — — µs input waveform

∗

3

fH = 100kHz Fig.3

SYNC separation level 3

VS3 60 — — µs input waveform

∗

3

fH = 200kHz Fig.3

Input waveform (input to pin 3 or 9 [see illustration to right], Ro = 240Ω)

∗

1 Vs and pwH = variable. Vs and pwH are interrelated. Refer to characteristics graph.

∗

2 Vs = 130mV, pwH = variable

∗

3 pwH = 1µs, Vs = variable

Duration of horizontal synchronization signal

Duty 25%

Vr = 0.7V

Vs = 130mV

pwH = 1µs

(1H)

7

Multimedia ICs BA7657F / BA7657S

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Measurement circuit

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

C1

C2

C1
C2

1

2

SW2

C1

C1

C1

C1

C2

C2

C2

C2

C1

C1

C1

C1

C2

C2

C2

C2

1

1

1

1

2

2

2

2

1

2

3

4
5

SW9SW8

1

2

A

75Ω

OSC2

1.2V

1.8V

5V

C1

C2

C1
C2

1

2

SW1

470pF

SW3

SW4

SW5

SW6

75Ω

1

2

3
4
5

OSC1

SW7

47µF

0.01µF

1

23

SW14

Oscilloscope
Network
Analyzer

1
2

1

2

3

Oscilloscope

1

3

4

5

2

75Ω

1.2V

1.8V

5V

SW17

SW16

2

75Ω

OSC3

1µF
1µF

1

3

20µA

3

Oscilloscope

2kΩ

V

CC = 5V

4

2kΩVCC = 5V

2

1

1.2V

1

2

3

1.8V

SW12

SW11

1

2

3

Oscilloscope

SW10

SW15

470kΩ

6

C1: 0.01µF
C2: 47µF

OSC5

A

VCC = 5V

V V

V V

VV

A

A A

Fig. 1

+ + + + + + + + + + + +

+

8

Multimedia ICs BA7657F / BA7657S

•

Electrical characteristic measurement conditions (1 / 2)

Parameter

Switch condition

11 Other

Supply current 3 1

〈〈Analog switch unit〉〉 (listings for color signal R switches only)

Parameter

Switch condition

12345671114 Other
Maximum output level R1 211111111 1
Maximum output level R2 121111121 1
Voltage gain R1 211111111 1
Voltage gain R2 121111121 1

〈〈Digital switch unit〉〉 (listings for synchronization signal VD switches only)

Parameter

Switch condition

8 9 10 11 15 16 17 Other

Input voltage VD1, "H" level 1411111 1
Input voltage VD2, "H" level 2412111 1
Input voltage VD1, "L" level 1511111 1
Input voltage VD2, "L" level 2512111 1
Input current VD1, "H" level 1211111 1
Input current VD2, "H" level 2212111 1
Input current VD1, "L" level 1111111 1
Input current VD2, "L" level 2112111 1

Rise time 1331111 1
Fall time 1331111 1
Rise delay time 1331111 1

Fall delay time 1331111 1
Output voltage, "H" level 1211111 1
Output voltage, "L" level 1111111 1
Output current, "H" level 1221111 1
Output current, "L" level 1121111 1

9

Multimedia ICs BA7657F / BA7657S

〈〈SYNC separation unit〉〉

Parameter

Switch condition

12 13 Other

Minimum SYNC
separation level

42 1

Output voltage, "H" level 2 3 1

Output voltage, "L" level 2 1 11
Output current, "L" level 3 1 11
Rise time 4 2 1
Fall time 4 2 1
Rise delay time 4 2 1
Fall delay time 4 2 1

10

Multimedia ICs BA7657F / BA7657S

•

Measurement circuit for frequency characteristics and crosstalk characteristics

1

C2

C1

2

C2

C2

C2

C2

C2

C1

C1

C1

C1

C1

3

4

5

6

7

8

9

10

11

0.01µF

47µF

21

20

240Ω

240Ω

Network
Analyzer

Network
Analyzer

19

240Ω

Network
Analyzer

15

SW

2

1

1.8V

1.2V

C1: 0.01µF
C2: 47µF

16

50Ω

50Ω

50Ω

50Ω

50Ω

50Ω

V

CC = 5V

Fig. 2

+ +

+

+

+ + +

11

Multimedia ICs BA7657F / BA7657S

•

Procedure for measurement of frequency characteristics and crosstalk characteristics

•

Circuit operation

Relationship between inputs and outputs

(1) Frequency characteristics
Use an oscillator to input a sine wave (V

IN = 1.0VP-P, f =

1MHz / 230MHz) to the color signal pins.
To select R1, G1 and B1: Set the switch to 1.
To select R2, G2 and B2: Set the switch to 2.

Gf1 = Gv (f = 1MHz) – Gv (230MHz) [dB]
(2) Frequency characteristic deviation
Use an oscillator to input a sine wave (V

IN = 1.0VP-P, f =

1MHz / 100MHz) to the color signal pins.
To select R1, G1 and B1: Set the switch to 1.
To select R2, G2 and B2: Set the switch to 2.

Gf1 = Gv (f = 1MHz) – Gv (100MHz) [dB]

∆Gfl = Gf (IN1) – Gf (IN2) [dB]

∆GfB = Gf (R1) – Gf (G1), Gf (G1) – Gf (B1),

Gf (B1) – Gf (R1) [dB]
(3) Input pin crosstalk (1)
Use an oscillator to input a sine wave (V

IN = 1.0VP-P, f =

10MHz) to IN1.
Use a capacitor to connect IN2 to GND. Set the switch
to 2, then select output IN2 and measure.

CTI1 = 20log (V

OUT / VIN) [dB]

(4) Input pin crosstalk 2
Use an oscillator to input a sine wave (V

IN = 1.0VP-P, f =

230MHz) to IN1.
Connect IN2 to the ground through a capacitor.
Set the switch to 2, input to IN2, then measure.

CTI2 = 20log (V

OUT / VIN) [dB]

(5) Block crosstalk 1
Use an oscillator to input a sine wave (V

IN = 1.0VP-P, f =

10MHz) to G1 and B1.
Connect R1 to the ground through a capacitor.
Set the switch to 1 and measure the R output.

CTB1R = 20log (V

OUTR / VING1) [dB]

Similarly,

CTB1G = 20log (V

OUTG / VINB1) [dB]

CTB1B = 20log (V

OUTB / VINR1) [dB]

(6) Block crosstalk 2
Use an oscillator to input a sine wave (V

IN = 1.0VP-P, f =

230MHz) to G1 and B1.
Connect R1 to the ground through a capacitor.
Set the switch to 1 and measure the R output.

CTB2R = 20log (V

OUTR / VING1) [dB]

Similarly,

CTB2G = 20log (V

OUTG / VINB1) [dB]

CTB2B = 20log (V

OUTB / VINR1) [dB]

(1) Analog switches
Used for switching between the two sets of RGB color
signals. Connect the high voltage to CTL to select IN1,
or the low voltage to select IN2.
(2) Digital switches
Used for switching between the two sets of HD / VD
synchronization signals. Connect the high voltage to
CTL to select the HD / VD synchronization signal for
IN1, or the low voltage to select the HD / VD synchro­nization signal for IN2.
(3) Synchronization separator
Used to output the synchronization signal after separat­ing it from the composite signal (Sync on Green).
When the HD signal is input it activates the synchro­nization signal detector, stopping the synchronization
separator. The length of time that the synchronization
separator remains stopped is set according to the con­stant attached to the detector wave pin of the synchro­nization detector.

Output

HD VD Sync on Green HD VD Composite Sync

——

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——

䊊

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—

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——

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—

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䊊䊊 䊊 䊊䊊

—

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——

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——

—

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—

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—

Input

12

Multimedia ICs BA7657F / BA7657S

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Application example

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

1

2

1

2

1

2

1

2

12

DET

Logic

Syncsepa

R

G

B

H

V

R

G

B

H

V

IN1

IN2

Ro

Ro

Composite Sync OUT

CTL

IN1: H
IN2: L

Ro

Blue OUT

VCC5V

Green OUT

Red OUT

HD OUT

VD OUT

0.01µ

75

470p

75

470K

75

75

75

75

0.01µ

68k

2k

47µ / 6.3V

1µ

0.01µ

47µ / 6.3V

47µ / 6.3V

47µ / 6.3V

47µ / 6.3V

47µ / 6.3V

47µ / 6.3V

0.01µ

0.01µ

0.01µ

0.01µ

V

CC5V

V

CC5V

Fig. 3

++++++

+

13

Multimedia ICs BA7657F / BA7657S

•

External dimensions (Units: mm)

SOP24 SDIP24

0.15

0.11

1.8 ± 0.1

5.4 ± 0.2

7.8 ± 0.3

0.4 ± 0.1

15.0 ± 0.2

0.3Min.

0.15 ± 0.1

24

1

13

12

1.27

0.51Min.

6.5 ± 0.3

0.3 ± 0.1

7.62

3.4 ± 0.2

22.9 ± 0.3

0.5 ± 0.11.778

13

12

24

1

3.95 ± 0.3

0° ~ 15°

BA7657F BA7657S

Resistors attached to analog switch outputs
Because analog switch frequency characteristics de­pend on output load capacity, set external resistance

(Ro) so that the frequency characteristics remain flat. A
too-large resistance will suppress the characteristic
peak.

•

Operation notes

•

Electrical characteristic curves

1M 10M 100M 300M

0

2

4

FREQUENCY: f (Hz)

– 2
– 4
– 6

– 8
– 10
– 12
– 14

VOLTAGE GAIN: GV (dB)

Fig. 4 Frequency characteristics

〈sink level Vs〉

280mV

50mV
Duty25%

10.0

9.0

8.0

7.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0
20 40 60 80 100 120 140 160 180 200

FREQUENCY: fH (kHz)

130mV

PULSE WIDTH: pwH (µs)

Fig. 6 Minimum SYNC

separation characteristics

1M

10M 100M 300M

10

0

CROSSTALK: CT (dB)

FREQUENCY: f (Hz)

– 10
– 20
– 30
– 40
– 50
– 60
– 70
– 80

– 90

Fig. 5 Interchannel crosstalk characteristics