WM8976CGEFLSLASHV datasheet(11/114 Pages) WOLFSON

11 / 114 page

Production Data

WM8976

PD, Rev 4.5, November 2011

POWER CONSUMPTION

Typical current consumption for various scenarios is shown below.

MODE

AVDD

(3.0V)

(mA)

DCVDD

(1.8V)

(mA)

DBVDD

(3.0V)

(mA)

TOTAL

POWER

(mW)

Off

0.04

0.0008

<0.0001

0.12

Sleep (VREF maintained, no clocks)

0.04

0.0008

<0.0001

0.12

MIC Record (8kHz)

4.1

1.0

0.001

14.1

Stereo 16Ω HP Playback (48kHz, quiescent)

3.3

6.2

0.004

21.1

Stereo 16Ω HP Playback (48kHz, white noise)

5.4

7.3

0.004

29.4

Stereo 16Ω HP Playback (48kHz, sine wave)

6.7

0.004

66.1

Notes:

DBVDD Current will increase with greater loading on digital I/O pins.

5 Band EQ is enabled.

AVDD standby current will fall to nearer 15uA when thermal shutdown sensor is disabled.

Table 1 Power Consumption

ESTIMATING SUPPLY CURRENT

When either the DAC or ADC is enabled approximately 7mA will be drawn from DCVDD when

DCVDD=1.8V and fs=48kHz. When the PLL is enabled approximately 1.5mA additional current will

be drawn from DCVDD.

As a general rule, digital supply currents will scale in proportion to sample rates. Supply current for

analogue and digital blocks will also be lower at lower supply voltages.

Power consumed by the output drivers will depend greatly on the signal characteristics. A quiet

signal, or a signal with long periods of silence will consume less power than a signal which is

continuously loud.

Estimated supply current for the analogue blocks is shown in Table 2. Note that power dissipated in

the load is not shown.

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