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BA7795FS Fiches technique(PDF) 6 Page - Rohm |
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BA7795FS Fiches technique(HTML) 6 Page - Rohm |
6 / 12 page 6 Video ICs BA7795LS / BA7795FS •Circuit operation (1) EE oparation The input switch is used to select the audio signal input source (LINE or TUER). This signal is amplified by the line amplifier (voltage gain: 20dB at 1kHz). The ALC circuit controls the line amplifier output level. The ALC level is set externally. If mute mode is set in this state, the switch that con- nects the output buffer will go off, but the ALC loop will not be cut. (2) Recoeding In recording mode, the recording amplifier directly con- nected to the line amplifier operates. The PB HEAD switch in the playback equalizer amplifi- er block switches on, and the signal is not input to the playback equalizer amplifier. The line amplifier output is attenuated by 20dB before it is input to the recording amplifier, so if the feedback components are chosen to given a gain of 20dB, the same REC OUT output level as the line amplifier can be obtained. It is also possible to switch the REC equalizer charac- teristic to suit the tape speed by switchig the control signal to EQ CTRL. The recording amplifier gain and equalizer characteristics are set externally. Signal flow for EE and recording operation C [F] Units: R [ Ω ] 1 3 5 7 9 11 13 15 17 19 21 23 24 22 20 18 16 14 12 10 8 6 4 2 – 20dB REC LINE + 28dB EP 22 µ 33 µ VCC EQ CTRL PB / TU / EE CTRL 39k 8.2k MUTE CTRL 1.5k 15k BIAS OSC REC + B 3.3 µ 330 22 µ 0.01 µ 330k 12k 8.2k 4.7k 4.7k 0.1 µ 47 µ 2.2M LINE IN TUNER IN RL LINE OUT 10 µ REC / EE CTRL BA7795LS ALC ∗ The BA7795FS has a different pin layout to the BA7795LS. Fig. 3 Signal flow for EE / recording |
Numéro de pièce similaire - BA7795FS |
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Description similaire - BA7795FS |
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