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PDF BH7634AS Data sheet ( Hoja de datos )
| Número de pieza | BH7634AS | |
| Descripción | Audio / video switch for CANAL - Plus decoder | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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 connec-
tors.
The I2C BUS for switch control simplifies applications, while the two expansion ports allow up to two external inputs.
•Applications
VCRs
•Features
1) I2C BUS control.
2) Video input is sync tip clamped, and includes a
small-capacity (0.022µF) input capacitor.
3) Three FSCOUT values.
4) Two expansion ports.
5) Audio mute function.
6) 75Ω driver output (pins 20 and 23) requires no
attached capacitor.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
Power dissipation
VCC 13.5
Pd 1200
Operating temperature
Topr
– 25 ~ + 60
Storage temperature
Tstg
– 55 ~ + 125
∗ Reduce by 12mW for each increase in Ta of 1°C over 25°C.
Unit
V
mW
°C
°C
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ. Max.
Operating power supply voltage
VCC
8.5 12
13
Unit
V
1
1 page  
Multimedia ICs
BH7634AS
Pin No. Pin name
IN
OUT
Typ.
voltage
I / O equivalent circuits
10 AUXCTL1
—™
12 AUXCTL2
—
Pin description
External control
An open collector. Normally
pulled up with a (roughly)
10kΩ resistor.
I2C BUS data input
50µA
13 SDA ™ — —
100
For serial data input
compliant with the I2C BUS.
14 SCL ™ — —
I2C BUS clock input
50µA
For clock input compliant
1k with the I2C BUS.
15 ADECOUT
—™
6V
17 AEXTOUT
16 AVTROUT — ™ 5.3V
Audio signal output
Outputs the audio signal.
ADECOUT and AEXTOUT
are respectively for decoder
output and external output.
500µA
Audio signal output
Outputs the audio signal.
AVRTOUT outputs to the
signal processor.
5
5 Page 
Multimedia ICs
•Application example
BH7634AS
VCC
MICROCONTROLLERS
24 23 22 21 20 19 18 17 16 15 14 13
CLAMP
6dB 6dB
VSW1
VSW2
A B A BC
VSW3
ABC
CLAMP
CLAMP
CLAMP
MUTE
I2C BUS
CONTROL
ASW1
ASW2
ASW3
AUXCTL1 FOR SWAUXCTL2
A BABCABC
VCC VCC
6.0V
REG
CURRENT
LIMITER
AUXCTL1
AUXCTL2
1 2 3 4 5 6 7 8 9 10 11 12
VCC
,
VCC
Fig. 2
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet BH7634AS.PDF ] | |
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