BH3532FS

Audio ICs Audio digital potentiometers BH3532FS The BH3532FS is a digital potentiometer designed for use in audio devices. Its built-in 22kΩ resistance systems can be used to set the data from the microcomputer in 256 steps. FApplications Volume of recording and playing FFeatures 1) Resistance can be set to any of 256 steps using digital codes (serial data). FAbsolute maximum ratings (Ta = 25_C) 2) Two built-in channels (Lch, Rch) 3) SSOP-A20 package FRecommended operating conditions (Ta = 25_C) FBlock diagram 549 Audio ICs FPin descriptions BH3532FS FInput / output circuits 550 Audio ICs FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 3.5V) BH3532FS FMeasurement circuit 551 Audio ICs FCircuit operation The BH3532FS has two 22kΩ variable resistance systems which can be set in 256 steps (86Ω intervals). Resistance can be set in 256 steps using the MSB first 8-bit data. Input data is 17-bit serial data. The first bit is always “L”. The next eight bits set the resistance for wiper 1. The last eight bits set the resistance for wiper 0. BH3532FS Input data is effective when the EN terminal is set to “H”, and is put on hold when the EN terminal is set to “L”. Also, the reading of the data is performed when CLK rises. When input data is effective, the previous output data is output serially to the DOUT terminal. See the figures below for more details. 552 Audio ICs FElectrical characteristic curves BH3532FS FExternal dimensions (Units: mm) 553