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BA7795 Scheda tecnica(PDF) 7 Page - Rohm |
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BA7795 Scheda tecnica(HTML) 7 Page - Rohm |
7 / 12 page 7 Video ICs BA7795LS / BA7795FS (3) Playback operation The signal applied to PB IN is amplified by playback equalizer amplifier. At this time, the REC HEAD switch is switched on by a control signal to REC / EE, and the potential on one side of the head is fixed at GND . The playback equalizer amplifier gain and equalizer charac- teristics are set externally. The playback level is set by the resistor divider between PB OUT and the playback line input, The signal to the playback line input passes though the input switch, is amplified by 20dB in the line amplifier, and is output to the output buffer (the voltage gain is different to that for the LINE input and TUNER input). It is possible to switch between the input block head equalizer resonance point and playback equalizer char- acteristic using the EQ CTRL control signal. The line output can be stopped by setting muting mode on using the MUTE CTRL signal. The ALC circuit and recording amplifier are stopped in playback mode. Signal flow for playback operation 1 3 5 7 9 11 13 15 17 19 21 23 2 4 6 8 10 12 14 16 18 20 22 24 + + + + + REC + B 22 µ 33 µ 22 µ 10 µ 0.1 µ 47 µ 0.01 µ 39k ALC LINE 3.3 µ 330k 330k 12k 8.2k 4.7k 4.7k 0.1 µ VCC REC – 20dB 2.2M 4.7k 8.2k 15k 1.5k 10 µ + 28dB 0.1 µ REC / EE CTRL EQ CTRL PB / TU / EE CTRL MUTE CTRL BIAS OSC LINE IN TUNER IN LINE OUT BA7795LS C [F] Units: R [ Ω] ∗ The BA7795FS has a different pin layout to the BA7795LS. Fig. 4 Signal flow for playback |
Codice articolo simile - BA7795 |
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Descrizione simile - BA7795 |
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