WM1811A Datasheet, PDF (1/328 Pages) Wolfson Microelectronics plc – Multi-Channel Audio Hub CODEC for Smartphones

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WM1811A
Multi-Channel Audio Hub CODEC for Smartphones
DESCRIPTION
FEATURES
The WM1811A^[1] is a highly integrated ultra-low power hi-fi
CODEC designed for smartphones and other portable devices
rich in multimedia features.
An integrated stereo Class D speaker driver and Class W
headphone driver minimize power consumption during audio
playback.
The device requires only two voltage supplies, with all other
internal supply rails generated from integrated LDOs.
Stereo full duplex asynchronous sample rate conversion and
multi-channel digital mixing combined with powerful analogue
mixing allow the device to support a huge range of different
architectures and use cases.
A programmable parametric EQ provides speaker compensation
in the digital playback paths. The dynamic range controller can
be used in record or playback 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 two digital
microphones. Microphone activity detection with interrupt is
available.Low power jack detection is supported via a dedicated
input pin. Impedance sensing and measurement is provided for
external accessory / push-button detection.
Fully differential internal architecture and on-chip RF noise filters
ensure a very high degree of noise immunity. Active ground loop
noise rejection and DC offset correction help prevent pop noise
and suppress ground noise on the headphone outputs.
 24-bit 2-channel hi-fi DAC and 2-channel hi-fi ADC
 100dB SNR during DAC playback (‘A’ weighted)
 Smart MIC interface
- Power, clocking and data input for up to two digital MICs
- High performance analogue MIC interface
- MIC activity detect & interrupt allows processor to sleep
- Low power jack detection support
- Impedance sensing for accessory / push-button detection
 2W stereo (2 x 2W) Class D speaker driver
 Capless Class W headphone drivers
- Integrated charge pump
- 5.3mW 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^TM Mobile 5-band, 4-channel parametric EQ
 Dynamic range controller
 Dual FLL provides all necessary clocks
- Self-clocking modes allow processor to sleep
- All standard sample rates from 8kHz to 96kHz
 Active noise reduction circuits
- DC offset correction removes pops and clicks
- Ground loop noise cancellation
 Integrated LDO regulators
 80-ball W-CSP package (4.158 x 3.876 x 0.607mm)
APPLICATIONS
 Smartphones and music phones
 Portable navigation
 Tablets, eBooks
 Portable Media Players
WOLFSON MICROELECTRONICS plc
[1] This product is protected by Patents US 7,622,984, US 7,626,445, and GB 2,469,345
Production Data, November 2013, Rev 4.1
Copyright 2013 Wolfson Microelectronics plc