San Jose, Calif. - An audio codec chip from Asahi Kasei Microsystems Semiconductor Inc. integrates a 16-bit monaural A/D converter, stereo D/A converter, phase-locked loop, and headphone and speaker amplifiers. The AK4534 targets PDAs and cell phones.
The converters support 16-bit sampling from 8 to 48 kHz to increase memory efficiency. The A/D, automatic-level-control and microphone amps enable recording for voice recognition and audio memos.
For audio playback, a stereo D/A and digital attenuator are used together with the built-in headphone and speaker amps. The headphone amp delivers up to 15 milliwatts of power at 8- to 32-ohm loads; the mono speaker amp delivers up to 150 mW.
The AK4534 has dual mono and stereo analog inputs for mixing external analog signals from cell phone controllers, MP3 decoders and external sources. Designers thus can create a unified audio system for combo systems.
The codec requires a 2.4- to 3.6-volt power supply. Available in a 48-pin LQFP or leadless 52-pin QFN package, it is priced at $8.21 in quantities of 1,000.
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