WM8750BL datasheet(8/59 Pages) WOLFSON

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WM8750BL

Pre-Production

Pre-Production Rev 3.3 January 2007

TYPICAL PERFORMANCE

POWER CONSUMPTION

The power consumption of the WM8750BL 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 WM8750BL.

•

Oversampling rate: Significant power savings can be achieved by running the DAC and ADC at the lower over-sampling

rate of 64 (this is achieved by setting ADCOSR and DACOSR to ‘1’ in R24). Note all figures quoted here assume

ADCOSR=DACOSR=1.

•

Operating mode: Disabling parts of the WM8750BL that are not currently in use (e.g. mic pre-amps, unused outputs,

DAC, ADC, etc.) also saves power.

Control Register

R23Other settings

Tot. Power

Bit

I (mA)

OFF

00 00000 00000000011 11

Clocks stopped

.30.000

.30.010

.30.000

0.03

2.5

0.000

2.5

0.008

2.5

0.000

2.5

0.000

0.0200

1.8

0.000

1.5

0.007

1.8

0.000

1.8

0.000

0.0105

Standby

10 10000 00000000011 11

Interface Stopped

3.30.360

3.30.011

3.30.000

1.2243

(500 KOhm VMID string)

2.5

0.268

2.5

0.009

2.5

0.000

2.5

0.000

0.6925

1.8

0.1831.5

0.007

1.8

0.000

1.8

0.000

0.3

Playback to Line-out

01 10000 01111000011 11

3.32.457

3.34.687

3.30.250

3.30.683

26.6541

2.5

1.814

2.5

2.779

2.5

0.178

2.5

0.670

13.6025

1.8

1.606

1.5

1.4831.8

0.122

1.8

0.406

6.0657

Playback to 32 Ohm Headphone

01 10000 01111000011 11

3.32.456

3.34.649

3.30.250

3.30.709

26.6112

2.5

1.814

2.5

2.758

2.5

0.178

2.5

0.682

13.5800

1.8

1.606

1.5

1.4831.8

0.122

1.8

0.410

6.0729

Playback to 32 Ohm Headphone

01 10000 01111000011 11

3.32.456

3.35.454

3.30.250

3.31.929

33.2937

0.1mW / channel into load

2.5

1.814

2.5

3.354

2.5

0.178

2.5

1.927

18.1825

(JEITA CP-2905B)

1.8

1.607

1.5

1.831

1.8

0.122

1.8

1.793

9.0861

Playback to 32 Ohm Headphone

01 10000 01111000011 11

3.3

2.470

3.3

5.469

3.3

0.250

3 .3

11.248

64.1421

5mW / channel into load

2.5

1.833

2.5

3.408

2.5

0.178

2.5 11.283

41.7550

1.8

1.635

1.5

1.862

1.8

0.122

1.8 10.974

25.7088

Playback to 32 Ohm Headphone

01 10000 01111000111 11

R24, OUT3SW=00

3.32.426

3.33.969

3.30.251

3.31.010

25.2648

(capless mode using OUT3)

2.5

1.788

2.5

2.705

2.5

0.179

2.5

0.980

14.1300

1.8

1.244

1.5

1.481

1.8

0.122

1.8

0.670

5.8863

Playback to 8 Ohm BTL Speaker

01 10000 01100110011 11

R24, ROUT2INV=1

3.32.652

3.34.655

3.30.250

3.31.256

29.0829

2.5

1.950

2.5

2.761

2.5

0.178

2.5

1.095

14.9600

1.8

1.694

1.5

1.482

1.8

0.122

1.8

0.7736.883

Headphone Amp

01 10000 00011000011 11

Clocks Stopped

.31.107

.30.624

.30.000

.30.685

7.9728

(line-in to 32 Ohm headphone)

2.5

0.812

2.5

0.090

2.5

0.000

2.5

0.672

3.9350

1.8

0.559

1.5

0.007

1.8

0.000

1.8

0.407

1.7493

Speaker Amp

01 10000 00000110011 11

Clocks Stopped

.31.3

.30.565

.30.000

.30.691

8.4513

(line-in to 8 Ohm speaker)

R24, ROUT2INV=1

2.5

0.948

2.5

0.092

2.5

0.000

2.5

0.679

4.2975

1.8

0.649

1.5

0.007

1.8

0.000

1.8

0.455

1.9977

Record from Line-in

01 11111 00000000011 11

3.34.631

3.35.010

3.30.2733.30.000

32.7162

2.5

3.892

2.5

3.237

2.5

0.196

2.5

0.000

18.3125

1.8

3.239

1.5

1.649

1.8

0.135

1.8

0.000

8.5467

Record from mono microphone

01 11010 10000000011 11 R32, LMICBOOST=11; 3.32.829

3.34.996

3.30.2733.30.000

26.7234

R23, DATSEL=01

2.5

2.330

2.5

3.208

2.5

0.194

2.5

0.000

14.3300

1.8

1.892

1.5

1.632

1.8

0.134

1.8

0.000

6.0948

Record from mono microphone

01 11010 10000000011 11 R32, LMICBOOST=11; 3.33.197

3.34.993 3.30.2733.30.000

27.9279

(differential)

R23, DATSEL=01;

2.5

2.593

2.5

3.208

2.5

0.194

2.5

0.000

14.9875

R32, LINSEL=11

1.8

2.067

1.5

1.636

1.8

0.134

1.8

0.000

6.4158

Stereo Record & Playback

01 11111 11100110011 11

3.36.670

3.38.014

3.30.272

3.30.805

52.0113

2.5

5.389

2.5

5.326

2.5

0.196

2.5

0.613

28.8100

1.8

4.281

1.5

2.851

1.8

0.135

1.8

0.329

12.8175

DBVDD

HPVDD

R24

R25 (19h)

R26 (1Ah)

AVDD

DCVDD

Table 1 Supply Current Consumption

Notes:

All figures are at TA = +25

oC, Slave Mode, fs = 48kHz, MCLK = 12.288 MHz (256fs), ADCOSR=DACOSR=1.

Unless otherwise noted, these measurements are quiescent (i.e. signal amplitude is zero).

WM8750BL Datasheet(PDF) 8 Page - Wolfson Microelectronics plc

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