WM8510GEDSSLASHRV datasheet(49/56 Pages) WOLFSON

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WM8510

PP Rev 1.2 December 2004

POWER MANAGEMENT

SAVING POWER BY REDUCING OVERSAMPLING RATE

The default mode of operation of the ADC and DAC digital filters is in 64x oversampling mode. Under

the control of ADCOSR and DACOSR the oversampling rate may be doubled. 64x oversampling

results in a slight decrease in noise performance compared to 128x but lowers the power

consumption of the device.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10

DAC control

DACOSR12

DAC oversample rate select

0 = 64x (lowest power)

1 = 128x (best SNR)

R14

ADC control

ADCOSR12

ADC oversample rate select

0 = 64x (lowest power)

1 = 128x (best SNR)

Table 34 ADC and DAC Oversampling Rate Selection

VMID

The analogue circuitry will not work unless VMID is enabled (VMIDSEL 00). The impedance of the

VMID resistor string, together with the decoupling capacitor on the VMID pin will determine the

startup time of the VMID circuit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management 1

1:0

VMIDSE

Reference string impedance to VMID pin

(detemines startup time):

00=off (open circuit)

01=75kΩ

10=300kΩ

11=2.5kΩ (for fastest startup)

Table 35 VMID Impedance Control

BIASEN

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

management 1

BIASEN

Analogue amplifier bias control

Table 36 BIASEN Control

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