Audio ICs
Pre / power amplifier and motor governor for 3V headphone stereos
BA3528AFP / BA3529AFP
The BA3528AFP and AB3...
Audio ICs
Pre / power amplifier and motor governor for 3V headphone stereos
BA3528AFP / BA3529AFP
The BA3528AFP and AB3529AFP have been developed for headphone stereos. They run off a 3V power supply, and include dual pre- and power
amplifiers, and a motor governor. The pre
amplifiers are direct-coupled, and the power
amplifiers use a fixed-gain NF circuit. An on-chip VREF amplifier makes output coupling
capacitors unnecessary, and the motor governor uses a bridge ratio system to minimize the external parts count and make reliable and compact designs possible. FApplications 3V portable stereo equipment FFeatures 1) All the functions required for headphone stereo units on a single chip. 2) Preamplifier includes a mute amplifier. 3) Direct-coupled preamplifier.
4) No output coupling
capacitors required for the power
amplifiers. 5) Power
amplifiers do not require oscillation prevention measures. 6) Power amplifier gain allows use of noise reduction (BA3529AFP).
FAbsolute maximum ratings (Ta = 25_C)
FRecommended operating conditions (Ta = 25_C)
385
Audio ICs
FBlock diagram
BA3528AFP / BA3529AFP
386
Audio ICs
BA3528AFP / BA3529AFP
FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 3V, and f = 1kHz) BA3528AFP
387
Audio ICs
BA3529AFP
BA3528AFP / BA3529AFP
388
Audio ICs
FMeasurement circuit
BA3528AFP / BA3529AFP
389
Audio ICs
FCircuit operation (1) Preamplifier In the preamplifier input stage the pin 22 bias is the input and the negative feedback ...