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WM8750L

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc

WM8750L Datasheet PDF : 56 Pages

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WM8750L

POWER CONSUMPTION

The power consumption of the WM8750L 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 WM8750L.

• Operating mode: Significant power savings can be achieved by always disabling parts of the WM8750L 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

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

OFF

00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11 Clocks stopped 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

Standby

10 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11 Interface Stopped 3.3 0.3900 3.3 0.0390 3.3 0.0080 3.3 0.0000

(500 KOhm VMID string)

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

Playback to Line-out

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

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

Playback to Line-out

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

3.3 3.5170 3.3 4.6470 3.3 0.3000 3.3 0.9500

(64x oversampling mode)

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

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

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

Playback to 16 Ohm Headphone 01 1 0 0 0 0 0 1 1 1 1 0 0 0 1 0 0 11 R24, OUT3SW=00 3.3 3.7060 3.3 5.6400 3.3 0.3000 3.3 1.4040

(capless mode using OUT3)

2.5 2.7130 2.5 3.9000 2.5 0.2200 2.5 0.9600

1.8 1.8870 1.5 2.1410 1.5 0.1240 1.8 0.6140

Playback to 8 Ohm BTL Speaker 01 1 0 0 0 0 0 1 1 0 0 1 1 0 0 0 0 11 R24, ROUT2INV=1 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

Headphone Amp

01 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 11 Clocks Stopped 3.3 1.8400 3.3 0.0200 3.3 0.0080 3.3 0.9540

(line-in to 16 Ohm headphone)

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

Speaker Amp

01 1 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 11 Clocks Stopped 3.3 1.9780 3.3 0.0200 3.3 0.0080 3.3 0.3310

(line-in to 8 Ohm speaker)

01 R24, ROUT2INV=1 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

Phone Call

01 1 0 0 0 0 1 0 0 0 0 1 1 1 0 0 0 11 Clocks Stopped 3.3 2.5230 3.3 0.0370 3.3 0.0080 3.3 0.4420

(mono line-in to headphone,

2.5 1.8520 2.5 0.0190 2.5 0.0050 2.5 0.3200

mic to MONOOUT)

1.8 1.2900 1.5 0.0130 1.5 0.0030 1.8 0.2240

Record from Line-in

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

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

Record from Line-in

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

3.3 5.0720 3.3 5.9100 3.3 0.3390 3.3 0.0000

(64x oversampling mode)

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

Record from mono microphone 01 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 11 R32, LMICBOOST=11; 3.3 4.9330 3.3 6.5400 3.3 0.3390 3.3 0.0000

01 R23, DATSEL=01 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

Record from mono microphone 01 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 11 R32, LMICBOOST=11; 3.3 5.2900 3.3 6.5000 3.3 0.3220 3.3 0.0000

(differential)

01 R23, DATSEL=01; 2.5 4.5600 2.5 4.2700 2.5 0.2400 2.5 0.0000

00 R32, LINSEL=11 1.8 3.9000 1.5 2.2200 1.5 0.1380 1.8 0.0000

Stereo Record & Playback

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

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

Stereo Record & Playback

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

3.3 8.1090 3.3 9.3300 3.3 0.3330 3.3 0.2820

(64x oversampling mode)

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

36.4650

19.4825

7.8993

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

39.9696

22.6750

10.5570

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.

PP Rev 1.77 May 2003

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