DESCRIPTION

The WM8974 is a low power, high quality mono codec designed for portable applications such as Digital Still Camera or Digital Voice Recorder. The device integrates support for a differential or single ended mic, and includes drivers for speakers or headphone, and

mono line output. External component requirements are reduced as no separate microphone or headphone amplifiers are required.

FEATURES

• Mono Codec:

• Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz

• DAC SNR 98dB, THD -84dB (‘A’-weighted @ 8 – 48ks/s)

• ADC SNR 90dB, THD -80dB (‘A’-weighted @ 8 – 48ks/s)

• On-chip Headphone/Speaker Driver with ‘cap-less’ connect

- 40mW output power into 16Ω / 3.3V SPKRVDD

- BTL speaker drive 0.9W into 8Ω / 5V SPKRVDD

• Additional MONO Line output

• Multiple analog or ‘Aux’ inputs, plus analog bypass path

• Mic Preamps:

• Differential or single end Microphone Interface

- Programmable preamp gain

- Psuedo differential inputs with common mode rejection

- Programmable ALC / Noise Gate in ADC path

• Low-noise bias supplied for electret microphones



OTHER FEATURES

• 5 band EQ (record or playback path)

• Digital Playback Limiter

• Programmable ADC High Pass Filter (wind noise reduction)

• Programmable ADC Notch Filter

• On-chip PLL

• Low power, low voltage

- 2.5V to 3.6V (digital core: 1.62V to 3.6V)

- power consumption <10mA all-on 48ks/s mode

• 4x4x0.9mm 24 pin QFN package



APPLICATIONS

• Digital Still Camera Audio Codec

• General Purpose low power audio CODEC