Ultra Low Power Codec for Portable Audio Applications
The WM8904 is a high performance, ultra low power stereo codec featuring stereo ground-referenced headphone amplifiers that incorporate a dual-mode charge pump architecture to optimize efficiency and power consumption during playback. The ground-referenced headphone and line outputs eliminate AC coupling capacitors, and both outputs include common mode feedback paths to reject ground noise. Control sequences for audio path setup can be pre-loaded and executed by an integrated control write sequencer to reduce software driver development and minimize pops and clicks. The analog input stage can be configured for single ended, or differential inputs. Up to three stereo microphone or line inputs may be connected. The input impedance is constant with PGA gain setting. A stereo digital microphone interface is provided, with a choice of two inputs. A dynamic range controller provides compression and level control to support a wide range of portable recording applications. Anti-clip and quick release features offer excellent performance in the presence of loud impulsive noises. ReTune™ Mobile 5-band parametric equalizer with fully programmable coefficients is integrated for optimization of speaker characteristics. Programmable dynamic range control is also available for maximizing loudness, protecting speakers from clipping and preventing premature shutdown due to battery droop.
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Technologies
Features
- 3.0 mW quiescent power consumption for DAC to headphone playback
- 2.4 mW quiescent power consumption for analog bypass playback
- DAC SNR 96 dB typical, THD -86 dB typical
- ADC SNR 91 dB typical, THD -80 dB typical
- Control write sequencer for pop minimized start-up and shutdown
- Single register write for default start-up sequence
- Integrated FLL provides all necessary clocks
- Self-clocking modes allow processor to sleep
- All standard sample rates from 8 kHz to 96 kHz
- Stereo digital microphone input
- 3 single ended inputs per stereo channel
- 1 fully differential mic / line input per stereo channel
- Digital Dynamic range controller (compressor / limiter)
- Digital sidetone mixing
- Ground-referenced headphone driver
- Ground-referenced line outputs
- 32-pin QFN package (4x4mm, 0.4mm pitch)
- 36-ball WLCSP package (2.6 x 2.5mm, 6 x 6 ball grid, 0.4mm pitch)
Parametric Specifications
| DACs | 2 |
| ADCs | 2 |
| DAC THD+N (dB) | -86 |
| ADC THD+N (dB) | -80 |
| Sample Rate (kHz) | 8-96 |
| Analog Power Supply (V) | 1.71-2 |
| Power Consumption (mW) | 7.81-8.81 |
| Package | 32 QFN; 36 WLCSP |
