WM8510GEDSSLASHRV datasheet(14/81 Pages) WOLFSON

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WM8510

Production Data

PD Rev 4.1 December 2006

AUDIO INTERFACES

The WM8510 has a standard audio interface, to support the transmission of audio data to and from

the chip. This interface is a 4 wire standard audio interface which supports a number of audio data

formats including I

2S, DSP Mode, MSB-First, left justified and MSB-First, right justified, and can

operate in master or slave modes.

CONTROL INTERFACES

To allow full software control over all its features, the WM8510 offers a choice of 2 or 3 wire MPU

control interface. It is fully compatible and an ideal partner for a wide range of industry standard

microprocessors, controllers and DSPs. The selection between 2-wire mode and 3-wire mode is

determined by the state of the MODE pin. If MODE is high then 3-wire control mode is selected, if

MODE is low then 2-wire control mode is selected.

In 2 wire mode, only slave operation is supported, and the address of the device is fixed as 0011010.

CLOCKING SCHEMES

WM8510 offers the normal audio DAC clocking scheme operation, where 256fs MCLK is provided to

the DAC/ADC.

However, a PLL is also included which may be used to generate the internal master clock frequency

in the event that this is not available from the system controller. This PLL uses an input clock,

typically the 12MHz USB

or ilink clock, 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 CSB/GPIO pin and used elsewhere in the system.

POWER CONTROL

The design of the WM8510 has given much attention to power consumption without compromising

performance. It operates at low supply voltages, and includes the facility to power off any unused

parts of the circuitry under software control, includes standby and power off modes.

INPUT SIGNAL PATH

The WM8510 has 3 flexible analogue inputs for two separate microphone inputs. These inputs can

be used in a variety of ways. The input signal path before the ADC has a flexible PGA block which

then feeds into a gain boost/mixer stage.

MICROPHONE INPUTS

The WM8510 can accommodate a variety of microphone configurations including single ended and

pseudo-differential inputs.

The inputs through the MICN, MICP and optionally MIC2 pins are

amplified through the input PGA as shown in Figure 6.

A pseudo differential input is the preferential configuration where the positive terminal of the input

PGA is

connected to the MICP input pin by setting MICP2INPPGA=1. The microphone ground

should then be connected to MICN (when MICN2INPPGA=1) or optionally to MIC2 (when

MIC2_2INPPGA=1) input pins.

Alternatively a single ended microphone can be connected to the MICN input with MICN2INPPGA set

to 1. The non-inverting terminal of the input PGA should be connected internally to VMID by setting

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