Video ICs
Pin No.
Pin name, function and remarks
Voltage
7
〈VCC〉
VCC
• Power supply for anything other than REC + B.
BA7746S / BA7746FS
Circuit diagram
—
〈REC MUTE CTRL〉
• REC MUTE control.
8
• In REC MUTE mode, the recording amplifier
—
output is stopped.
• REC: L, REC MUTE: H.
• Do not leave open circuit.
〈OVER REC CTRL〉
• OVER REC control.
9
• In OVER REC mode, the recording current is set
—
to + 2dB (Typ.).
• Do not leave open circuit.
30k
MUTE REC
30k
OVER NORMAL
10
〈REC MIX IN〉
• Recording amplifier input.
REC: 2.9V
PB: 2.9V
10k
10k
〈REC NF〉
• Recording amplifier feedback.
11
• Connect the GND of a decoupling capacitor to
main GND (pin 16) to improve common-mode
distortion.
REC: 1.4V
PB: 0.5V
〈REC / PB CTRL〉
• REC / PB control pin.
12
• Use of an RC circuit time constant to slow the rise
of the control signal reduces noise spikes during
—
switching.
• Do not leave open circuit.
4
10.2k
240
1.04k
30k