Multi-channel Codec with Three Digital Audio Interfaces
The WM8994 is a highly integrated, ultra low power hi-fi codec with an integrated stereo Class D and AB speaker driver, and a Class W headphone driver to minimize power consumption during audio playback. The device requires only Vbatt and a 1.8V supply, generating all other internal supply rails from integrated LDOs. Stereo full duplex asynchronous sample rate conversion and multi-channel digital mixing combined with powerful analog mixing to support a wide range of different architectures and use cases. A fully programmable parametric EQ provides speaker compensation and a dynamic range controller can be used in the ADC or DAC paths for maintaining a constant signal level, maximizing loudness and protecting speakers against overloading and clipping. A smart digital microphone interface provides power regulation, a low jitter clock output and decimation filters for up to four digital microphones. A MIC activity detect with interrupt is available. Active ground loop noise rejection and DC offset correction help prevent pop noise and suppress ground noise on the headphone outputs.
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Technology
Features
- Hi-fi 24-bit 4-channel DAC and 2-channel ADC
- 100 dB SNR during DAC playback (‘A’ weighted)
- Smart MIC interface
- Power, clocking and data input for up to four digital MICs
- High performance analog MIC interface
- MIC activity detect & interrupt allows processor to sleep
- 2W stereo (2 x 2W) class D/AB speaker driver
- Capless Class W headphone drivers
- Integrated charge pump
- 5.3 mW total power for DAC playback to headphones
- 4 line outputs (single-ended or differential)
- BTL earpiece driver
- Digital audio interfaces for multi-processor architecture
- Asynchronous stereo duplex sample rate conversion
- Powerful mixing and digital loopback functions
- ReTune™ Mobile 5-band, 6-channel parametric EQ
- Programmable dynamic range controller
- Dual FLL provides all necessary clocks
- Self-clocking modes allow processor to sleep
- All standard sample rates from 8 kHz to 96 kHz
- Active noise reduction circuits
- DC offset correction removes pops and clicks
- Ground loop noise cancellation
- Integrated LDO regulators
- 72-ball W-CSP package (4.511 x 4.023 x 0.7mm)
Parametric Specifications
| DACs | 4 |
| ADCs | 2 |
| DAC Dynamic Range (dB) | 100 |
| ADC Dynamic Range (dB) | 95 |
| DAC THD+N (dB) | -87 |
| ADC THD+N (dB) | -82 |
| Sample Rate (kHz) | 8-96 |
| Analog Power Supply (V) | 1.8-3.3 |
| Digital Power Supply (V) | 1-3.3 |
| Logic Power Supply (V) | |
| Operational Power Consumption (mW) | 1.1-21.1 |
| Package | 72 WLCSP |
