WM8904ECSSLASHR datasheet(52/188 Pages) WOLFSON

Teilenummer	WM8904ECS/R

Bauteilbeschribung	Ultra Low Power CODEC for Portable Audio Applications

PDF	188 Pages

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Hersteller	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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WM8904

Pre-Production

PP, Rev 3.3, September 2012

ADC OVERSAMPLING RATIO (OSR)

The ADC oversampling rate is programmable to allow power consumption versus audio performance

trade-offs. The default oversampling rate is high for best performance; using the lower OSR setting

reduces ADC power consumption.

To ensure specified ADC performance, the ADC Bias Control bits in register R198 must be set

correctly, depending on the ADC_OSR128 value, as described in Table 14.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R10 (0Ah)

Analogue

ADC 0

ADC_OSR128

ADC Oversampling Ratio

0 = Low Power (64 x fs)

1 = High Performance (128 x fs)

R198 (C6h)

ADC Test 0

ADC_128_OSR

_TST_MODE

ADC Bias Control (1)

Set this bit to 1 in ADC 64fs mode

(ADC_OSR128 = 0).

Set this bit to 0 in ADC 128fs mode

(ADC_OSR128 = 1).

ADC_BIASX1P

ADC Bias Control (2)

Set this bit to 1 in ADC 64fs mode

(ADC_OSR128 = 0).

Set this bit to 0 in ADC 128fs mode

(ADC_OSR128 = 1).

Table 14 ADC Oversampling Ratio

WM8904ECS/R Datenblatt(PDF) 52 Page - Wolfson Microelectronics plc