WM1811A datasheet(38/328 Pages) WOLFSON

38 / 328 page

WM1811A

Production Data

PD, November 2013, Rev 4.1

The WM1811A has highly flexible digital audio interfaces, supporting a number of protocols, including

2S, DSP, MSB-first left/right justified, and can operate in master or slave modes. PCM operation is

supported in the DSP mode. A-law and

-law companding are also supported. Time division

multiplexing (TDM) is available to allow multiple devices to stream data simultaneously on the same

bus, saving space and power.

A powerful digital mixing core allows data from each audio interface channel and from the ADCs and

digital MICs to be mixed and re-routed back to a different audio interface and to the DAC output paths.

The digital mixing core can operate synchronously with either Audio Interface 1 or Audio Interface 2,

with asynchronous stereo full duplex sample rate conversion performed on the other audio interface

as required.

The system clock (SYSCLK) provides clocking for the ADCs, DACs, DSP core, digital audio interface

and other circuits. SYSCLK can be derived directly from one of the MCLK1 or MCLK2 pins or via one

of two integrated FLLs, providing flexibility to support a wide range of clocking schemes, including

self-clocking FLL modes. Typical portable system MCLK frequencies, and sample rates from 8kHz to

96kHz are all supported. A low frequency (eg. 32.768kHz) clock can be used as the input reference to

the FLLs, providing further flexibility. Automatic configuration of the clocking circuits is available,

derived from the sample rate and from the MCLK / SYSCLK ratio.

The WM1811A uses a standard 2-wire control interface, providing full software control of all features,

together with device register readback. It is an ideal partner for a wide range of industry standard

microprocessors, controllers and DSPs. Unused circuitry can be disabled under software control, in

order to save power; low leakage currents enable extended standby/off time in portable battery-

powered applications.

Versatile GPIO functionality is provided, with support for button/accessory detect inputs, or for clock,

system status, or programmable logic level output for control of additional external circuitry. Interrupt

logic, status readback and de-bouncing options are supported within this functionality.

WM1811A Datasheet(PDF) 38 Page - Wolfson Microelectronics plc