BA7757 Rohm, BA7757 Datasheet
BA7757
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BA7757 Summary of contents
Page 1
... Switchless REC / PB amplifier for standard audio signal processing BA7757BK The BA7757BK contains a playback equalizer amplifier, an REC / PB switch, a line amplifier, an ALC circuit with built-in detector, a recording amplifier, an analog switch for input switching, and a logic control circuit for independent switching of REC / EE EE, line mute and input. ...
Page 2
... LINE REC IN 31 LINE INPUT SW 120k PB BIAS 39.2dB R LINE P BIAS ALC BA7757BK CTRL REC NFB REC CTRL REC 12 REC OUT – 24.4dB CTRL 10 HEAD SW CTRL BF 9 LINE OUT 7 8 ...
Page 3
... R 0.85 1.2 — – 0.5 0 — VSW — 0.002 0.1 SW — 75 — INM 0.85 1.2 — BA7757BK Unit Unit V = 5V, and f = 1kHz) Unit Conditions mA No signal, EE and SP mode mA No signal, EE and EP mode % LINE IN ~ LINE OUT – 25dBV DISTN = 1% rms dBV V = – 15dBV ...
Page 4
... PB BIAS V reg 39.2dB R LINE P BIAS ALC N. ALC OFF FADE OUT / FADE IN CTRL Fig. 1 BA7757BK MIC IN 1k 0.47 220p 4.7 14 2.7k 51k 13 1 REC 12 10k – 24.4dB 10k 7 8 22k 10k MUTE Units ...
Page 5
... ALC N. FADE OUT / FADE IN CTRL Fig. 2 0.15 0.1 0.15 MIC IN AC BIAS OSC 0.47 220p CTRL REC 13 CTRL REC – 24.4dB 11 CTRL 22k 10k MUTE CTRL Units BA7757BK LINE OUT 5 ...