WM8904CGEFLSLASHV datasheet(21/188 Pages) WOLFSON

21 / 188 page

Pre-Production

WM8904

PP, Rev 3.3, September 2012

POWER CONSUMPTION

The WM8904 power consumption is dependent on many parameters. Most significantly, it depends

on supply voltages, sample rates, mode of operation, and output loading.

The power consumption on each supply rail varies approximately with the square of the voltage.

Power consumption is greater at fast sample rates than at slower ones. When the digital audio

interface is operating in Master mode, the DBVDD current is significantly greater than in Slave mode.

(Note also that power savings can be made by using MCLK as the BCLK source in Slave mode.) The

output load conditions (impedance, capacitance and inductance) can also impact significantly on the

device power consumption.

COMMON TEST CONDITIONS

Unless otherwise stated, the following test conditions apply throughout the following sections:



Ambient temperature = +25°C



Audio signal = quiescent (zero amplitude)



Sample rate = 48kHz



MCLK = 12.288MHz



Audio interface mode = Slave (LRCLK_DIR=0, BCLK_DIR=0)



SYSCLK_SRC = 0 (system clock comes direct from MCLK, not from FLL)

Additional, variant test conditions are quoted within the relevant sections below. Where applicable,

power dissipated in the headphone or line loads is included.

POWER CONSUMPTION MEASUREMENTS

Single-ended Stereo Line Record - IN1L/R, IN2L/R or IN3L/R pins to ADC output.

Test conditions:

L_MODE = R_MODE = 00b (Single ended)

LIN_VOL = RIN_VOL = 00101 = +0.0 dB

ADC_OSR128 = 0 (64*fs), ADC_128_OSR_TST_MODE = 1, ADC_BIASx1P5 = 1

MICBIAS = disabled

Variant test conditions

AVDD

DCVDD

DBVDD

CPVDD

MICVDD

TOTAL

48kHz sample rate

1.80

4.38

1.00

0.80

1.80

0.02

1.80

0.01

1.80

0.01

8.72

8kHz sample rate

1.80

4.25

1.00

0.14

1.80

0.00

1.80

0.01

1.80

0.01

7.81

48kHz -6dBV sine wave

1.80

4.41

1.00

0.80

1.80

0.03

1.80

0.01

1.80

0.01

8.81

Differential Stereo Record from Analogue Microphones - IN1L/R, IN2L/R or IN3L/R pins to ADC out.

Test conditions:

L_MODE = R_MODE = 10b (Differential mic)

LIN_VOL = RIN_VOL = 00111 = +30.0 dB

ADC_OSR128 = 0 (64*fs), ADC_128_OSR_TST_MODE = 1, ADC_BIASx1P5 = 1

MICBIAS_ENA = 1, MICBIAS_SEL = 000, No load connected to MICBIAS

Variant test conditions

AVDD

DCVDD

DBVDD

CPVDD

MICVDD

TOTAL

48kHz sample rate

1.80

4.38

1.00

0.80

1.80

0.02

1.80

0.01

1.80

0.01

8.73

8kHz sample rate

1.80

4.25

1.00

0.14

1.80

0.00

1.80

0.01

1.80

0.01

7.81

48kHz -30dBV sine wave

1.80

4.39

1.00

0.81

1.80

0.03

1.80

0.01

1.80

0.01

8.78

WM8904CGEFL/V 데이터시트(PDF) 21 Page - Wolfson Microelectronics plc

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