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Multimedia ICs
Audio / video switch for CANAL - Plus decoder
BH7634AS
The BH7634AS is one-chip IC that contains audio and video switches that support 21-pin SECAM and PAL connectors. The I2C BUS for switch control simplifies applications, while the two expansion ports allow up to two external inputs.
*Applications VCRs *Features control. 1) I C BUS
2
2) Video input is sync tip clamped, and includes a small-capacity (0.022F) input capacitor. 3) Three FSCOUT values.
4) Two expansion ports. 5) Audio mute function. 6) 75 driver output (pins 20 and 23) requires no attached capacitor.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 13.5 1200 - 25 ~ + 60 - 55 ~ + 125 Unit V mW C C
Reduce by 12mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Operating power supply voltage Symbol VCC Min. 8.5 Typ. 12 Max. 13 Unit V
1
Multimedia ICs
BH7634AS
*Block diagram
VEDC IN 1 CLAMP CLAMP 24 VVTRIN
A DRVGND 2 B VSW1 6dB 23 VEXTOUT
DRIVER
VTUNIN
3
CLAMP
A B C VSW2
BUFFER
22
VVTROUT
DRVVCC
4
BUFFER
21
VVPSOUT
A VEXTIN 5 CLAMP B C VSW3 6dB 20 VDECOUT
DRIVER
GND
6
19
VCC
ADECIN
7 VCC 6.0V REG A ASW1 VCC B A BUFFER
18
AVTRIN
FSCOUT
8
17
AEXTOUT
AEXTIN
B 9 C A
ASW2
BUFFER
16
AVTROUT
AUXCTL1
10
CURRENT LIMITER
B C
ASW3
BUFFER
15
ADECOUT
AUXCTL1 ATUNIN 11 AUXCTL1 14
2
SCL
FOR SW AUXCTRL2 12 AUXCTL2 AUXCTL2
I C BUS CONTROL
MUTE 13 SDA
2
Multimedia ICs
BH7634AS
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin name VDECIN DRVGND VTUNIN DRVVCC VEXTIN GND ADECIN FSCOUT AEXTIN AUXCTL1 ATUNIN AUXCTL2 SDA SCL ADECOUT AVTROUT AEXTOUT AVTRIN VCC VDECOUT VVPSOUT VVTROUT VEXTOUT VVTRIN Function Composite video signal input (sink chip clamp). The driver ground. Not internally connected to the ground (pin 6). Composite video signal input (sink chip clamp). The driver power supply. Not internally connected to VCC (pin 19). Composite video signal input (sink chip clamp). Ground Audio signal input. Outputs one of three values (11.8V, 5.9V or 0.2V) as controlled by the I2C BUS. Audio signal input. Open collector. Normally pulled up to roughly 10k. Audio signal output. Open collector. Normally pulled up to roughly 10k. I2C BUS Serial Data input. I2C BUS Serial Clock input. Audio output. Audio output. Audio output. Audio input. Power supply. Composite video signal output. Composite video signal output. Composite video signal output. Composite video signal output. Composite video signal input (sink chip clamp).
3
Multimedia ICs
BH7634AS
*Pin descriptions and input output equivalent circuits
Pin No. Pin name IN 1 3 5 24 VDECIN VTUNIN VEXTIN
50A 1k
Typ. OUT voltage
I / O equivalent circuits
Pin description Video signal input For composite video signal input (sink chip clamp input).
TM
--
1.6V
VVTRIN Ground
2
DRVGND -- -- 0V
DRVGND GND
6
GND
DRVGND is the driver ground. GND is the ground for the circuit itself. GND and DRVGND are not connected internally.
Power supply 4 DRVVCC -- 19 VCC -- 12V
DRVVCC VCC
DRVVCC is the driver power supply. VCC is the power supply for the circuit itself. VCC and DRVVCC are not connected internally.
7 9 11 18
ADECIN
50A
Audio signal input For audio signal input. Input impedance is 50k.
AEXTIN ATUNIN
TM
--
5.3V
1k
50k
AVTRIN
12V 6V
FS control Three voltages are output via I2C BUS control: 11.8V, 5.9V, 0.2V.
8
FSCOUT
--
TM
--
50k
4
Multimedia ICs
BH7634AS
Pin No. Pin name
IN
Typ. OUT voltage
I / O equivalent circuits
Pin description External control
10
AUXCTL1 --
TM
--
An open collector. Normally pulled up with a (roughly) 10k resistor.
12
AUXCTL2
I2C BUS data input
50A
13
SDA
TM
--
--
100
For serial data input compliant with the I2C BUS.
I2C BUS clock input
50A
14
SCL
TM
--
--
1k
For clock input compliant with the I2C BUS.
Audio signal output 15 ADECOUT -- 17 AEXTOUT Outputs the audio signal. ADECOUT and AEXTOUT are respectively for decoder output and external output.
TM
6V
Audio signal output Outputs the audio signal. AVRTOUT outputs to the signal processor.
500A
16
AVTROUT --
TM
5.3V
5
Multimedia ICs
BH7634AS
Pin No. Pin name
IN
Typ. OUT voltage
I / O equivalent circuits
Pin description Video signal output
20
VDECOUT --
TM
1.7V
23
VEXTOUT
Outputs the composite video signal. VDECOUT and VEXTOUT are respectively for decoder output and external output.
Video signal output 21 VVPSOUT -- 22 VVTROUT Outputs the composite video signal. VVPSOUT is output for VPS, VVTSOUT outputs to the signal processor.
TM
1.0V
1mA
6
Multimedia ICs
BH7634AS
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 12V)
Parameter
Device
Symbol
Min.
Typ.
Max.
Unit
Conditions
Supply current FSCOUT voltage, H FSCOUT voltage, M FSCOUT voltage, L FSCOUT restriction current External controller sink current External controller voltage, L
Video switches
ICC VFSCH VFSCM VFSCL IFSC ISYN VAUXL
30 11.0 5.2 0 -- 1.0 0
46 11.8 5.9 0.2 -- -- 0.2
62 12.0 6.8 1.0 20 -- 1.0
mA V V V mA mA V
No signal RL = 10k RL = 10k RL = 10k VFSCO = 0V RL = 10k RL = 10k
Voltage gain Frequency characteristics
Audio switches
GVV VF
-1 -3
0 0
1 1
dB dB
VIN = 1VP-P, f = 4.43MHz VIN = 1VP-P, f = 100k / 7MHz
Voltage gain Maximum output level Total harmonic distortion Input conversion noise voltage Input impedance Offset voltage
Control
GVA VOMA THD VMin. ZIN VOF
-1 3.0 -- -- 40 --
0 3.6 0.005 20 50 --
1 -- 0.1 100 60 20
dB Vrms % Vrms k mV
VIN = 1Vrms, f = 1kHz f = 1kHz, THD = 0.5% VIN = 1Vrms, f = 1kHz DIN AUDIO Rg = 600
"H" level voltage "L" level voltage
Note: Supports I2C BUS input.
VH VL
3.0 0
-- --
-- 1.5
V V
*Guaranteed design parameters (unless otherwise noted, Ta = 25C, VCC = 12V)
Parameter
Video switches
Symbol
Min.
Typ.
Max.
Unit
Conditions
Interchannel crosstalk Secondary harmonics Tertiary harmonics
Audio switches
CTV HD2 HD3
-- -- --
- 70 - 45 - 50
- 50 - 40 - 45
dB dB dB
VIN = 1VP-P, f = 4.43MHz VIN = 1VP-P, f = 4.43MHz VIN = 1VP-P, f = 4.43MHz
Interchannel crosstalk Mute attenuation
CTA VMTA
-- --
- 90 - 90
- 70 - 70
dB dB
VIN = 1Vrms, f = 1kHz VIN = 1Vrms, f = 1kHz
7
Multimedia ICs
BH7634AS
*Recommended I C BUS operating conditions
2
Parameter SCL clock frequency Data transfer waiting time Start holding time SCL"L", holding time SCL"H", holding time Start setup time Data setup time Signal rise time Signal fall time Stop setup time
Symbol fSCL tBUF tHD: STA tLOW tHIGH tSU: STA tSU: DAT tR tF tSU: STO
Min. 0 4.7 4.0 4.7 4.0 4.7 250 -- -- 4.0
Max. 100 -- -- -- -- -- -- 1000 300 --
Unit kHz s s s s s ns ns ns s
Conditions
I2C BUS control signal
SDA
t BUF tR tF
SCL P S t HD: STA t LOW t HIGH t SU: DAT t SU: STA Sr t SU: STO P
8
Multimedia ICs
BH7634AS
*I C BUS control input
2
I C BUS format S SLAVE ADDRESS A S SLAVE ADDRESS : : DATA1 A DATA2 A P
2
Start condition Slave address MSB 1 0 0 0 0 0 1
LSB 0
A DATA1 , 2
: :
Confirmation response clock pulse Data byte MSB LSB 1st byte D9 D8 D7 D6 D5 D4 D3 D2
MSB D1 D0 0
2nd byte 0 0 0 0
LSB 0
*Switch input and mode selection
SW1
D9 H L SELECT A B
SW2
D8 H H L L D7 H L H L SELECT A A B C
SW3
D6 H H L L D5 H L H L SELECT A A B C
FSCOUT control
D4 H H L L D3 H L H L FSC OUT LOW MIDDLE HIGH HIGH
External control 1
D1 H L AUX CTL1 OUT HIGH LOW
External control 2
D0 H L AUX CTL2 OUT HIGH LOW
MUTE control
D2 H L MUTE MUTE NORMAL
Note: When D2 is HIGH, only the audio switches are muted.
9
Multimedia ICs
BH7634AS
*Measurement circuit
47
1 2 SW18
47
5V
75
75
10k
1k
10k
1k
1k
VCC
1
75
75
2 SW24
A
1k
SG4
10k
I C BUS SG
2
0.022
SW19 DRVVCC
470
100
100
470
V
17
24
23
22
21
20
19
18
47
16
47
15
47
14
13
BUFFER
BUFFER
BUFFER
BUFFER
DRIVER
DRIVER
BUFFER
MUTE CLAMP
I C BUS CONTROL 6dB 6dB
2
AUXCTL1 FOR SW AUXCTL2 VSW1 VSW2 VSW3 ASW1 ASW2 ASW3
A
B
A
B
C
A
B
C
A
B
A
B
C
A
B
C
VCC
VCC
6.0V REG CURRENT LIMITER AUXCTL1
CLAMP
CLAMP
CLAMP
AUXCTL2
1
2
3
4
5
6
7
8
9
10
11
12
0.022
0.022
0.022
V
V
SW8 2
V
V
10k
V
1
SW1 2
1
SW3 2
DRVVCC 1
SW5 2 1 SW7 2 3
1
A
1 SW9 2 3 1 SW11 2 3
A
SG1
SG2
SG3
A
47
10k
47
47
47
47
VCC
47
VCC
20
600
600
SG6
20
SG6
SG7
Fig. 1
10
600
20
10k
5V
3
20
SG8
600
V
DECODER IN VTRIN 24
1
CLAMP
CLAMP
, 75 0.022F VSW1 A 0.022F 23 6dB 2 DRIVER 75 B TUNNER IN 22 CLAMP 3 A VSW2 0.022F B BUFFER 100F C 21 4 VCC
EXT OUT
*Application example
Multimedia ICs
0.1F
100F
VTR OUT
VPS OUT BUFFER 100F DECODER OUT 20 6dB DRIVER 75
EXT IN1 VSW3 A
75 B 5 C 0.022F
CLAMP
1F
75 6
1F VCC 19
EXT IN2
Fig. 2
DECODER IN 7 47F TO 21PIN CONNECTOR A VCC 6.0V REG ASW1 VCC 8 10k B ASW2 A B 9 C 47F VCC 10k 10 A ASW3 B C CURRENT LIMITER AUXCTL1 TUNER IN 11 47F AUXCTL1 FOR SWAUXCTL2 AUXCTL2 12
VTR IN 18 47F EXT OUT BUFFER 17 47F VTR OUT BUFFER 16 47F DECODER OUT BUFFER 15
EXT IN1
47F
EXT IN2
47F
47F
14
MICROCONTROLLERS
I C BUS CONTROL
2
MUTE 13
BH7634AS
11
Multimedia ICs
BH7634AS
*Electrical characteristic curves
25 GAIN: g (dB) GAIN: g (dB)
25
25
0
0
GAIN: g (dB) 1M 10M 100M
0
- 25 100k
1M
10M
100M
- 25 100k
- 25 1k
10k
100k
1M
10M
FREQUENCY: f (Hz)
FREQUENCY: f (Hz)
FREQUENCY: f (Hz)
Fig. 3 Video output (pins 20, 23) frequency characteristics
25
Fig. 4 Video output (pins 21, 22) frequency characteristics
Fig. 5 Audio output (pins 15, 17) frequency characteristics
GAIN: g (dB)
0
- 25 1k
10k
100k
1M
10M
FREQUENCY: f (Hz)
Fig. 6 Audio output (pin 16) frequency characteristics
*External dimensions (Units: mm)
22.9 0.3 24 13 6.5 0.3 1 12
0.51Min.
3.4 0.2 3.95 0.3
7.62
0.3 0.1
1.778
0.5 0.1
0 ~ 15
SDIP24
12

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