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BA7746FS Datasheet(PDF) 5 Page - Rohm |
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BA7746FS Datasheet(HTML) 5 Page - Rohm |
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5 / 12 page  5 Video ICs BA7746S / BA7746FS 13 REC: 0V PB: 0V 14 REC: 0.58V PB: 0V 15 REC: 4.1V PB: 0V 16 GND — 17 REC: 0V PB: 0.8V 18 REC: 0V PB: 0.7V Pin No. Pin name, function and remarks Voltage Circuit diagram 〈REC AGC FILTER〉 • REC AGC filter. • The attack characteristics of the recording amplifier can be adjusted using the CR circuit. • Reduce the CR circuit GND-side impedance to improve the common-mode distortion. 〈REC CURRENT SENSE〉 • Terminal for monitoring the recording current. • Open emitter output. • The REC AGC output current can be adjusted with the R value. e.g. 12 Ω...48.2mAP-P, 15Ω...38.6mAP-P 〈REC OUT〉 • Recording amplifier output and head switch. • Open collector output. • The head switch turns on and off in accordance with the REC / PB control signal 〈MAIN GND〉 • Earth for circuits other than the preamplifier. • Reference potential for the IC 〈PRE AC-FB ch1〉 • AC feedback terminal for the playback amplifier (ch1). • The high-frequency characteristics of the playback amplifier can be adjusted with the R value 〈PRE IN ch1〉 • Input terminal for the playback amplifier (ch1). • The low-frequency cutoff characteristics can be adjusted with the value of the input coupling capacitor. • The frequency characteristics can be adjusted so that it is flat with the L value of the rotary transformer, and the external capacitor C (100pF etc.). 2k 2k 14 15 17 18 4k 13k |
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