D/A Converter with Integrated Class AB/D Amplifier
The WM9081 is a mono D/A converter with an integrated Class AB/Class D amplifier that provides high power output at low distortion levels for portable applications. Mobile parametric EQ with fully programmable coefficients is integrated for optimization of speaker characteristics. Programmable dynamic range control is available for maximizing loudness and protecting speakers from clipping and preventing premature shutdown due to battery droop. Digital input enables the power drivers to be located close to the speakers in multi-channel systems eliminating the need for output filter components and reducing PCB track lengths while minimizing emissions. The digital input can also help to minimize crosstalk to the speaker output signal from high gain microphone inputs to enhance stability and reduce the risk of ‘howling’ during speakerphone operation.
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Technology
Features
- Speaker common mode boost maximizes power for SPKVDD/AVDD ratios
- Low power FLL provides all necessary internal clocks at 32 kHz to 27 MHz input frequency
- All common sample rates from 8 to 96 kHz supported
- Standard two-wire, three-wire, four-wire and hardware control modes
- Data formats: LJ, RJ, I²S, DSP, all with TDM support
- Thermal shutdown interrupt
- Extended temp operating range: -40°C to 85°C
Parametric Specifications
| Description | DAC + Class AB/D Speaker Driver |
| Vout(V)-Max | 5.5 |
| Output Power (W) @1% THD+N, into 8 ohm | 1.5 |
| DSP | No |
| Boost | None |
| Channels | Mono |
| Inputs | I²S; TDM; Analog |
| Supply (V) | 2.7-3.6 |
| Idle Power Consumption (mW) | 24.9 |
| Size (mm²) | 16.4 |
| Package | 28 QFN |
| Pitch (mm) | 0.45 |
