WM8972L

Preliminary Technical Data

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PTD Rev 2.2 June 2004

8

POWER CONSUMPTION

The power consumption of the WM8972L depends on the following factors.

•

Supply voltages: Reducing the supply voltages also reduces supply currents, and therefore results in significant power

savings, especially in the digital sections of the WM8972L.

•

Operating mode: Significant power savings can be achieved by always disabling parts of the WM8972L that are not

used (e.g. mic pre-amps, unused outputs, DAC, ADC, etc.)

Control Register

R23

Other settings

Tot. Power

Bit

V

I (mA)

V

I (mA)

V

I (mA)

V

I (mA)

mW

OFF

00 00000000000 11

Clocks stopped

3.3 0.0016 3.3 0.0190 3.3 0.0080 3.3 0.0002

0.0950

01

2.5 0.0008 2.5 0.0170 2.5 0.0050 2.5 0.0000

0.0570

00

1.8 0.0005 1.5 0.0120 1.5 0.0029 1.8 0.0000

0.0233

Standby

10 10000000000 11

Interface Stopped

3.3 0.3900 3.3 0.0390 3.3 0.0080 3.3 0.0000

1.4421

(500 KOhm VMID string)

01

2.5 0.2880 2.5 0.0170 2.5 0.0050 2.5 0.0000

0.7750

00

1.8 0.1970 1.5 0.0120 1.5 0.0030 1.8 0.0000

0.3771

Playback to 8 Ohm BTL Speaker 01 10001110000 11

R24, OUTINV=1

3.3

TBD

3.3

TBD

3.3

TBD

3.3

TBD

TBD

01

2.5

TBD

2.5

TBD

2.5

TBD

2.5

TBD

TBD

00

1.8

TBD

1.5

TBD

1.5

TBD

1.8

TBD

TBD

Speaker Amp

01 10000110000 11

Clocks Stopped

3.3 1.9780 3.3 0.0200 3.3 0.0080 3.3 0.3310

7.7121

(line-in to 8 Ohm speaker)

01

R24, OUTINV=1

2.5 1.4300 2.5 0.0190 2.5 0.0050 2.5 0.2430

4.2425

00

1.8 0.9860 1.5 0.0130 1.5 0.0030 1.8 0.1760

2.1156

Phone Call

01 10010111000 11

Clocks Stopped

3.3 2.5230 3.3 0.0370 3.3 0.0080 3.3 0.4420

9.9330

(mono line-in to headphone,

01

2.5 1.8520 2.5 0.0190 2.5 0.0050 2.5 0.3200

5.4900

mic to MONOOUT)

00

1.8 1.2900 1.5 0.0130 1.5 0.0030 1.8 0.2240

2.7492

Record from Line-in

01 11100000000 11

3.3

TBD

3.3

TBD

3.3

TBD

3.3

TBD

TBD

01

2.5

TBD

2.5

TBD

2.5

TBD

2.5

TBD

TBD

00

1.8

TBD

1.5

TBD

1.5

TBD

1.8

TBD

TBD

Record from Line-in

01 11100000010 11

3.3

TBD

3.3

TBD

3.3

TBD

3.3

TBD

TBD

(64x oversampling mode)

01

2.5

TBD

2.5

TBD

2.5

TBD

2.5

TBD

TBD

00

1.8

TBD

1.5

TBD

1.5

TBD

1.8

TBD

TBD

Record from mono microphone

01 11110000000 11 R32, MICBOOST=11; 3.3 4.9330 3.3 6.5400 3.3 0.3390 3.3 0.0000

38.9796

01

R23, DATSEL=01

2.5 4.2970 2.5 4.2500 2.5 0.2400 2.5 0.0000

21.9675

00

1.8 3.7210 1.5 2.2200 1.5 0.1370 1.8 0.0000

10.2333

Record from mono microphone

01 11110000000 11 R32, MICBOOST=11; 3.3 5.2900 3.3 6.5000 3.3 0.3220 3.3 0.0000

39.9696

(differential)

01

R23, DATSEL=01;

2.5 4.5600 2.5 4.2700 2.5 0.2400 2.5 0.0000

22.6750

00

R32, INSEL=11

1.8 3.9000 1.5 2.2200 1.5 0.1380 1.8 0.0000

10.5570

Record & Playback

01 11111110000 11

3.3

TBD

3.3

TBD

3.3

TBD

3.3

TBD

TBD

01

2.5

TBD

2.5

TBD

2.5

TBD

2.5

TBD

TBD

00

1.8

TBD

1.5

TBD

1.5

TBD

1.8

TBD

TBD

Record & Playback

01 11111110011 11

3.3

TBD

3.3

TBD

3.3

TBD

3.3

TBD

TBD

(64x oversampling mode)

01

2.5

TBD

2.5

TBD

2.5

TBD

2.5

TBD

TBD

00

1.8

TBD

1.5

TBD

1.5

TBD

1.8

TBD

TBD

DBVDD

HPVDD

R24

R25 (19h)

R26 (1Ah)

AVDD

DCVDD

Table 1 Supply Current Consumption

Notes:

1.

2.

The power dissipated in the headphone or speaker is not included in the above table.