BA3840KV

Audio ICs Preset graphic equalizer for headphone stereos BA3840KV The BA3840KV is a preset graphic equalizer IC for headphone stereos. It combines two equalizer circuit channels on a single chip, and also includes a dynamic sound leak reduction circuit. FApplications Headphone stereos Portable CD players FFeatures 1) Four sound quality settings are possible by DC control. 2) High-frequency sounds can be cut off based on the volume. FBlock diagram 3) The sound leak reduction circuit can be turned on and off by DC control. 555 Audio ICs FAbsolute maximum ratings (Ta = 25_C) BA3840KV FRecommended operating conditions (Ta = 25_C) FElectrical characteristics(unless otherwise noted, Ta = 25_C, VCC = 2V, f = 1kHz, VIN = 100mVrms, F flat position on, sound leak reduction circuit off) 556 Audio ICs FPin descriptions BA3840KV 557 Audio ICs BA3840KV 558 Audio ICs BA3840KV 559 Audio ICs FMeasurement circuit BA3840KV FCircuit operation (1) Preset graphic equalizer (1) Flat position By pulling up the FLAT pin to VCC, frequency characteristics become flat. (2) Rock position By pulling up the ROCK pin to VCC, low frequencies are boosted by about 7dB. High frequencies are also adjusted to balance the subjectively heard sound. (3) Pop position By pulling up the POPS pin to VCC, mid-range frequencies are boosted by about 6dB and combined with the rock position characteristics. (4) Jazz position By open-circuiting the above three pins, low frequencies are boosted by 14dB. Hig...