WM8983
Product Preview
OUT3 and OUT4 can be configured to provide an additional stereo or mono differential lineout from
the output of the DACs, the mixers or the input microphone boost stages. They can also provide a
midrail reference for pseudo differential inputs to external amplifiers.
AUDIO INTERFACES
The WM8983 has a standard audio interface, to support the transmission of stereo data to and from
the chip. This interface is a 3 wire standard audio interface which supports a number of audio data
formats including:
•
•
I2S
DSP/PCM Mode (a burst mode in which LRC sync plus 2 data packed words are
transmitted)
•
•
MSB-First, left justified
MSB-First, right justified
The interface can operate in master or slave modes.
CONTROL INTERFACES
To allow full software control over all features, the WM8983 offers a choice of 2 or 3 wire control
interface. It is fully compatible and an ideal partner for a wide range of industry standard
microprocessors, controllers and DSPs.
Selection of the mode is via the MODE pin. In 2 wire mode, the address of the device is fixed as
0011010.
CLOCKING SCHEMES
WM8983 offers the normal audio DAC clocking scheme operation, where 256fs MCLK is provided to
the DAC and ADC.
A PLL is included which may be used to generate these clocks in the event that they are not
available from the system controller. This PLL can accept a range of common input clock
frequencies between 8MHz and 50MHz to generate high quality audio clocks. If this PLL is not
required for generation of these clocks, it can be reconfigured to generate alternative clocks which
may then be output on the GPIO pins and used elsewhere in the system.
POWER CONTROL
The design of the WM8983 has given much attention to power consumption without compromising
performance. It operates at very low voltages, includes the ability to power off any unused parts of
the circuitry under software control, and includes standby and power off modes.
AUXILIARY ANALOG INPUT SUPPORT
Additional stereo analog signals might be connected to the Line inputs of WM8983 (e.g. melody chip
or FM radio), and the stereo signal listened to via headphones, or recorded, simultaneously if
required.
PP Rev 1.1 August 2005
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
