AIVR3K Datasheet, PDF (9/11 Pages) Aplus Intergrated Circuits – APLUS INTEGRATED CIRCUITS INC

Integrated Circuits Inc. aIVR3K Series
CPU address mode with speaker direct drive (PWM)
C1 must be connected directly on the VDD and VSS pins of the chip
CPU address mode with COUT speaker drive (DAC)
C1 must be connected directly on the VDD and VSS pins of the chip
Rb is base resistor from 120 Ohm to 390 Ohm depends on value of VDD and transistor
gain.
Tr is an NPN transistor with beta larger than 150, e.g. 8050D.
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Mar 27, 2012