WM8510GEDSSLASHRV datasheet(57/81 Pages) WOLFSON

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Pre-Production

WM8510

PD Rev 4.1 December 2006

POWER SUPPLIES

The WM8510 can use up to four separate power supplies:

AVDD and AGND: Analogue supply, powers all analogue functions except the speaker output and

mono output drivers. AVDD can range from 2.5V to 3.6V and has the most significant impact on

overall power consumption (except for power consumed in the headphone). A large AVDD slightly

improves audio quality.

SPKVDD and SPKGND: Headphone and Speaker supplies, power the speaker and mono output

drivers. SPKVDD can range from 2.5V to 5.5V. SPKVDD can be tied to AVDD, but it requires

separate layout and decoupling capacitors to curb harmonic distortion. With a larger SPKVDD, louder

headphone and speaker outputs can be achieved with lower distortion. If SPKVDD is lower than

AVDD (or 1.5 x AVDD for BOOST mode), the output signal may be clipped.

DCVDD: Digital core supply, powers all digital functions except the audio and control interfaces.

DCVDD can range from 1.71V to 3.6V, and has no effect on audio quality. The return path for

DCVDD is DGND, which is shared with DBVDD.

DCVDD should be greater than or equal to 1.9V when using the PLL.

DBVDD can range from 1.71V to 3.6V. DBVDD return path is through DGND.

It is possible to use the same supply voltage for all four supplies. However, digital and analogue

supplies should be routed and decoupled separately on the PCB to keep digital switching noise out of

the analogue signal paths.

Note:

DCVDD should be greater than or equal to 1.9V when using the PLL.

RECOMMENDED POWER UP/DOWN SEQUENCE

In order to minimise output pop and click noise, it is recommended that the WM8510 device is

powered up and down using one of the following sequences:

Power Up When NOT Using the Output 1.5x Boost Stage:

Turn on external power supplies. Wait for supply voltage to settle.

Set BIASEN = 1, BUFIOEN = 1 and also the VMIDSEL[1:0] bits in the Power Management

1 register. * Notes 1 and 2.

Wait for the VMID supply to settle. * Note 2.

Enable DAC by setting DACEN = 1.

Enable mixers as required.

Enable output stages as required.

Unmute DAC by setting DACMU = 0.

Power Up When Using the Output 1.5x Boost Stage:

Turn on external power supplies. Wait for supply voltage to settle.

Enable 1.5x output boost. Set MONOBOOST = 1 and SPKBOOST = 1 as required.

Set BIASEN = 1, BUFIOEN = 1, BUFDCOPEN = 1 and also the VMIDSEL[1:0] bits in the

Power Management 1 register. * Notes 1 and 2.

Wait for the VMID supply to settle. * Note 2.

Enable DAC by setting DACEN = 1.

Enable mixers as required.

Enable output stages as required.

Unmute DAC by setting DACMU = 0.

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