BA7657S データシートの表示（PDF） - ROHM Semiconductor

部品番号

コンポーネント説明

メーカー

BA7657S

Broadband Triple Circuits Video Signal Switchers

ROHM Semiconductor 

●Description of operations

BA7657S/F

1) Analog SW block

Two channels of RGB signals can be switched.

I/O relations

IN1 can be selected when high-level voltage is applied to

the CTL pin, and IN2 can be selected when low level

Input

Output

voltage is applied.

HD VD Sync on Green HD VD Composite Sync

2) Digital SW block

－－

○

－－

○

This block switches between two channels of HD and VD

○－

○

○－

－

synchronization signals.

－○

○

－○

○

HD and VD synchronization signals are output for IN1 when

○○

○

○○

－

high-level voltage is applied to the CTL pin, and these signals ○ －

－

○－

－

are output for IN2 when a low-level voltage is applied to the

－○

－

－○

－

CTL pin.

○○

－

○○

－

3) Synchronization signal separation block

This block separates composite signals (Sync on Green) and synchronization signals and outputs positive-electrode

composite synchronization signals.

When an HD signal is being input, the synchronization signal detector operates and stops the synchronization signal

separation circuit. A low-level output voltage is used for output.

The time at which the synchronization signal separation circuit will be stopped can be set using external time constants

for the circuit detection pin.

●Application circuit

BA7657S/F

Fig.2

7/16

Share Link: