Описание
The WM8962B is a low power, high performance stereo CODEC designed for portable digital audio applications. An integrated charge pump provides a ground referenced output which removes the need for DC-blocking capacitors on the headphone outputs, and uses the Wolfson ‘Class-W’ amplifier techniques – incorporating an innovative dual-mode charge pump architecture – to optimise efficiency and power consumption during playback. A DC Servo is used to reduce DC ground offsets. This improves power consumption and minimises pops and clicks. Stereo class D speaker drivers provide 2W per channel into 4W BTL loads, with a 5V supply. Low leakage, excellent PSRR and pop/click suppression mechanisms also allow direct battery connection to the speaker supply. Flexible speaker boost settings allow speaker output power to be maximised while minimising other analogue supply currents. Control sequences for audio path setup can be pre-loaded and executed by an integrated sequencer to reduce software driver development and eliminate pops and clicks via Wolfson’s SilentSwitch technology. Flexible input configuration: four stereo inputs or eight mono inputs on Left or Right ADC, with a complete analogue (four single-ended stereo inputs) and digital microphone interface. External component requirements are drastically reduced as no separate microphone, speaker or headphone amplifiers are required. Advanced on-chip digital signal processing performs automatic level control for the microphone or line input. Stereo 24-bit sigma-delta ADCs and DACs are used with low power over-sampling digital interpolation and decimation filters and a flexible digital audio interface.
- DAC SNR 98dB (‘A’ weighted), THD -84dB at 48kHz, 1.8V
- ADC SNR 94dB (‘A’ weighted), THD -85dB at 48kHz, 1.8V
- Stereo Class D Speaker Driver
- 2W per channel into 4? BTL speakers
- 2W mono (for improved THD)
- Flexible internal switching clock
- Wolfson ‘Class-W’ ultra-low power headphone driver
- Up to 31mW per channel output power at 1% THD+N into 16? at 1.8V
- Ground Referenced
- Low offset (+/
- 1.2mV)
- Pop and click suppression
- Control sequencer for pop-minimised power-up/down
- Single register write for default start-up sequence
- Microphone Interface
- Single ended four stereo analogue input
- Integrated low noise MICBIAS
- Digital microphone interface
- Programmable ALC / Limiter and Noise Gate
- Programmable Audio Enhancement DSP with Presets
- Virtual Surround Sound
- HD Bass
- ReTuneTM
- Fixed Audio Processing DSP
- 3D stereo widening
- 5-band Parametric EQ
- Dynamic range controller
- Beep generator
- Two integrated PLLs enable clocking of full audio system
- Low Power Consumption
- 7.7mW headphone playback
- 8.3mW analogue record mode
- Low Supply Voltages
- Analogue 1.7V to 2.0V (Speaker supply up to 5.5V)
- Charge pump 1.7V to 2.0V
- MIC bias amp supply 1.7V to 3.6V
- Digital 1.62V to 2.0V
- 2-wire I2C and 3
- or 4-wire SPI serial control interface
- Standard sample rates from 8kHz to 96kHz
- W-CSP, 3.6×3.9mm 49-pin
