DESCRIPTION

The WM8945 is a highly integrated low power hi-fi CODEC designed for portable devices such as digital still cameras.

Up to 4 analogue inputs may be connected; a digital microphone interface is also provided. Flexible output mixing options support single-ended and differential configurations, with outputs derived from the digital audio paths or from analogue bypass paths. Mono line output and mono BTL headphone/speaker drive is supported.

FEATURES

Hi-fi audio CODEC

- 94dB SNR during ADC recording (‘A’ weighted)

- 96dB SNR during DAC playback (‘A’ weighted)

4 analogue audio inputs

Integrated bias reference for electret microphones

Digital microphone interface

Powerful digital mixing / DSP functions:

- 5-notch filters

- 5-band equalizer (EQ)

- ReTune? parametric filter

- Dynamic range control and noise gate

- Low-pass/High-pass filters

- Direct Form 1 (DF1) programmable digital filter

Digital beep generator

Mono line output

Mono BTL headphone/speaker output driver

I2S digital audio interface - sample rates 8kHz to 48kHz

Frequency Locked Loop (FLL) frequency conversion / filter

Video buffer function

4-wire Touch Panel interface controller

Auxiliary ADC for DC measurement or battery monitoring

Integrated LDO low-noise voltage regulator

36-ball W-CSP package (2.96 x 3.06 x 0.7mm, 0.5mm pitch)

APPLICATIONS

Digital Still Cameras (DSC)

Multimedia phones