WM8961GEFLSLASHV datasheet(12/116 Pages) WOLFSON

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WM8961

Pre-Production

PP, August 2009, Rev 3.1

TYPICAL POWER CONSUMPTION

The WM8961 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 DVDD 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

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

power dissipated in the headphone or line loads is included.

All measurements given in this section are typical and derived from evaluation.

MEASUREMENTS

Stereo line record - LINPUT1 and RINPUT1 pins to ADC output.

Test conditions:

LINVOL = RINVOL = 011111b (0dB)

Variant test conditions

AVDD

DVDD

SPKVDD

MICVDD

TOTAL (see

note 1)

48kHz sample rate, quiescent

1.8

7.08

1.8

5.0

0.001

2.5

0.001

48kHz sample rate, quiescent, MBSEL=1

1.8

7.08

1.8

5.0

0.001

2.5

0.258

16.7

48kHz sample rate, -1dBFS Input

1.8

7.12

1.8

5.0

0.001

2.5

0.001

16.1

8kHz sample rate (256fS i.e. MCLK =

2.048MHz)

1.8

6.85

1.8

0.30

5.0

0.001

2.5

0.001

12.9

Note:

CPVDD consumed 0.004mA in all cases.

Stereo Playback DAC to Headphones – Low Power Headphone Playback with 16Ω load.

Test conditions

CP_DYN_PWR[1:0] = 0b11 (Dynamic control of charge pump power)

48kHz sample rate

Variant test conditions

AVDD

DVDD

SPKVDD

CPVDD

TOTAL

Quiescent

1.8

1.79

1.8

1.55

5.0

0.002

1.8

0.54

6.99

Po = 2mW/channel

1.8

1.79

1.8

1.57

5.0

0.002

1.8

18.0

38.2

Po = 16mW/channel

1.8

1.82

1.8

1.57

5.0

0.002

1.8

59.8

114

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