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BA7746 Datasheet(PDF) 3 Page - Rohm |
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BA7746 Datasheet(HTML) 3 Page - Rohm |
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3 / 12 page  3 Video ICs BA7746S / BA7746FS •Pin descriptions 1 2 REC: 0.9V PB: 0V 3— 4— 5 REC: 3.6V PB: 1.9V 6 REC: 2.0V PB: 2.0V VCC — (RL: 1.8k Ω) Pin No. Circuit diagram Pin name, function and remarks Voltage 〈VCC REC + B〉 • Power supply for REC + B. • Connect to VCC (pin 7). 〈REC TC〉 • REC + B time constant. • Use to adjust the REC + B rise time using the C value. The value of the built-in resistor is 20k Ω. • The effect of current spikes when recording is started is reduced 〈HSWP IN〉 • Pulse input for head switching. • ch1: H, ch2: L 〈EP / SP CTRL〉 • EP / SP mode control. • In EP mode, the playback amplifier gain is set to + 5dB (Typ.). • EP: H, SP: L • Do not leave open circuit 〈PRE OUT〉 • Playback amplifier output. • Open emitter output. • When there is a chance of oscillation due to capacitive load, reduce the output current, or connect a resistor in series (approx. 390 Ω). • Avoid capacitive coupling with the playback input 〈VCA CTRL (PRE MUTE)〉 • VCA control. • When the terminal is open (a C is required), the playback amplifier gain is set to the Typ. value. • The PRE MUTE function is made possible by connection of a mute H signal to this through a diode 20k REC 24k EP SP 40k MUTE H 580 30k 20k |
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