WM8971L Datasheet, PDF(12/56 Page) Wolfson Microelectronics plc – STEREO CODEC FOR PORTABLE AUDIO APPLLICATIONS

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WM8971L Datasheet, PDF (12/56 Pages) Wolfson Microelectronics plc – STEREO CODEC FOR PORTABLE AUDIO APPLLICATIONS

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WM8971L

Advanced Information

POWER CONSUMPTION

The power consumption of the WM8971L depends on the following factors.

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

savings, especially in the digital sections of the WM8971L.

â¢ Operating mode: Significant power savings can be achieved by always disabling parts of the WM8971L that are not

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

Control Register

R25 (19h)

R26 (1Ah)

R24 R23 Other settings

AVDD

DCVDD DBVDD HPVDD Tot. Power

Bit

OFF

00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11

Standby

10 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11

(500 KOhm VMID string)

Playback to Line-out

01 1 0 0 0 0 0 1 1 0 0 1 1 0 0 0 11

Playback to Line-out

01 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 11

(64x oversampling mode)

Playback to 16 Ohm Headphone 01 1 0 0 0 0 0 1 1 1 1 0 0 0 0 0 11

Playback to 8 Ohm BTL Speaker 01 1 0 0 0 0 0 1 1 0 0 1 1 0 0 0 11

Headphone Amp

01 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 11

(line-in to 16 Ohm headphone)

Speaker Amp

01 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 11

(line-in to 8 Ohm speaker)

Phone Call

01 1 0 0 0 0 1 0 0 0 0 1 1 1 0 0 11

(mono line-in to headphone,

mic to MONOOUT)

Record from Line-in

01 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 11

Record from Line-in

01 1 1 1 1 1 0 0 0 0 0 0 0 0 1 0 11

(64x oversampling mode)

Record from mono microphone 01 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 11

Stereo Record & Playback

01 1 1 1 1 1 1 1 1 0 0 1 1 0 0 0 11

Stereo Record & Playback

01 1 1 1 1 1 1 1 1 0 0 1 1 0 1 1 11

(64x oversampling mode)

Clocks stopped

Interface Stopped

R24, ROUT2INV=1

Clocks Stopped

R24, ROUT2INV=1

Clocks Stopped

R23, DATSEL=01

V I (mA) V I (mA) V I (mA) V I (mA)

3.3 0.0016 3.3 0.0190 3.3 0.0080 3.3 0.0002

2.5 0.0008 2.5 0.0170 2.5 0.0050 2.5 0.0000

1.8 0.0005 1.5 0.0120 1.5 0.0029 1.8 0.0000

3.3 0.3900 3.3 0.0390 3.3 0.0080 3.3 0.0000

2.5 0.2880 2.5 0.0170 2.5 0.0050 2.5 0.0000

1.8 0.1970 1.5 0.0120 1.5 0.0030 1.8 0.0000

3.3 3.7310 3.3 5.6600 3.3 0.3000 3.3 0.2370

2.5 2.6940 2.5 3.8600 2.5 0.2200 2.5 0.2100

1.8 1.8820 1.5 2.1400 1.5 0.1240 1.8 0.1500

3.3 3.5170 3.3 4.6470 3.3 0.3000 3.3 0.9500

2.5 2.5760 2.5 3.2030 2.5 0.2200 2.5 0.6480

1.8 1.7760 1.5 1.7590 1.5 0.1240 1.8 0.4130

3.3 3.7260 3.3 5.6700 3.3 0.3000 3.3 0.9530

2.5 2.7530 2.5 3.9250 2.5 0.2200 2.5 0.6570

1.8 1.8900 1.5 2.1410 1.5 0.1240 1.8 0.4150

3.3 3.8820 3.3 5.6470 3.3 0.3000 3.3 0.2830

2.5 2.8780 2.5 3.9390 2.5 0.2200 2.5 0.2100

1.8 1.9800 1.5 2.1630 1.5 0.1240 1.8 0.1510

3.3 1.8400 3.3 0.0200 3.3 0.0080 3.3 0.9540

2.5 1.3300 2.5 0.0190 2.5 0.0050 2.5 0.6400

1.8 0.9300 1.5 0.0130 1.5 0.0030 1.8 0.4100

3.3 1.9780 3.3 0.0200 3.3 0.0080 3.3 0.3310

2.5 1.4300 2.5 0.0190 2.5 0.0050 2.5 0.2430

1.8 0.9860 1.5 0.0130 1.5 0.0030 1.8 0.1760

3.3 2.5230 3.3 0.0370 3.3 0.0080 3.3 0.4420

2.5 1.8520 2.5 0.0190 2.5 0.0050 2.5 0.3200

1.8 1.2900 1.5 0.0130 1.5 0.0030 1.8 0.2240

3.3 8.6600 3.3 6.5700 3.3 0.3330 3.3 0.0000

2.5 7.7100 2.5 4.2800 2.5 0.2320 2.5 0.0000

1.8 6.8000 1.5 2.2100 1.5 0.1350 1.8 0.0000

3.3 5.0720 3.3 5.9100 3.3 0.3390 3.3 0.0000

2.5 4.2550 2.5 3.7500 2.5 0.2320 2.5 0.0000

1.8 3.5900 1.5 1.9100 1.5 0.1350 1.8 0.0000

3.3 4.9330 3.3 6.5400 3.3 0.3390 3.3 0.0000

2.5 4.2970 2.5 4.2500 2.5 0.2400 2.5 0.0000

1.8 3.7210 1.5 2.2200 1.5 0.1370 1.8 0.0000

3.3 11.927 3.3 10.870 3.3 0.3320 3.3 0.2820

2.5 10.112 2.5 7.3600 2.5 0.2340 2.5 0.2060

1.8 7.3910 1.5 4.0610 1.5 0.1320 1.8 0.1480

3.3 8.1090 3.3 9.3300 3.3 0.3330 3.3 0.2820

2.5 6.5500 2.5 6.3020 2.5 0.2340 2.5 0.2070

1.8 4.7000 1.5 3.3800 1.5 0.1320 1.8 0.1490

0.0950

0.0570

0.0233

1.4421

0.7750

0.3771

32.7624

17.4600

7.0536

31.0662

16.6175

6.7647

35.1417

18.8875

7.5465

33.3696

18.1175

7.2663

9.3126

4.9850

2.4360

7.7121

4.2425

2.1156

9.9330

5.4900

2.7492

51.3579

30.5550

15.7575

37.3593

20.5925

9.5295

38.9796

21.9675

10.2333

77.2563

44.7800

19.8597

59.5782

33.2325

13.9962

Table 1 Supply Current Consumption

Notes:

1. All figures are at TA = +25oC, Slave Mode, fs = 48kHz, MCLK = 12.288 MHz (256fs), with zero signal (quiescent)

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

AI Rev 3.0 March 2004

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