WM8945: Mono CODEC with video buffer and touchpanel controller
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.
Flexible digital mixing and powerful DSP functions are available. Programmable filters and other processes may be applied to the ADC and DAC signal paths simultaneously. The DSP functions include 5 notch filters, 5-band EQ, dynamic range control and the Wolfson ReTune™ feature.
The ReTune™ feature is a sophisticated digital filter that can compensate for imperfect characteristics of the housing, loudspeaker or microphone components in an application. The ReTune™ algorithm can provide acoustic equalisation and selective phase (delay) control of specific frequency bands.
The WM8945 is controlled via a I2C or SPI interface. Additional functions include 4-wire Touch Panel controller, Auxiliary ADC, Digital beep generator, Video buffer, programmable GPIO functions, Frequency Locked Loop (FLL) for flexible clocking support and integrated LDO for low noise supply regulation.
The WM8945 is supplied in 36-ball W-CSP package, ideal for portable systems.
- Hi-fi audio CODEC
- 94dB SNR during ADC recording (‘A’ weighted)
- 98dB 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)
Ordering & Samples
- DRC Operation in Wolfson Audio CODECs, Rev 1.0
- Implementing ReTune™ with Wolfson Audio CODECs, Rev 1.1
- I2S USB Audio Streaming, Rev 1.0
- Decoupling and Layout Methodology for Wolfson DACs, ADCs and CODECs, Rev 1.1