Preliminary Technical Data

WM8737L

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AI Rev 3.0 May 2004

9

POWER CONSUMPTION

The power consumption of the WM8737L depends on the following factors.

•

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

savings (at the cost of reduced maximum SNR and THD performance).

•

Operating mode: Power consumption is lower when microphone pre-amps are not used. It can be also reduced in mono

or analogue mix-to-mono modes by switching off unused PGAs and ADCs via the power management register.

TYP. SUPPLY CURRENTS

(MILLIAMPS)

TOTAL

POWER

(mW)

MODE DESCRIPTION

POWER MANAGEMENT REGISTER

SETTING

MVDD = 1.8V, AVDD = 1.8V, DBVDD = 1.8V, DCVD = 1.5V, Low Power Mode, no MICBIAS or mic preamps

OFF

000000000

0.000

(<0.01)

0.000

(<0.01)

0.007

(<0.01)

0.011

(<0.02)

Standby

110000000

0.692

(0.55)

0.004

(<0.01)

0.009

(<0.01)

1.356

Mono (L/R)

111101000 / 111010100

1.978

(2.5)

0.011

1.633

6.029

Stereo / Digital Mono Mix

111111100

3.205

(4.2)

0.018

1.666

8.299

Analogue mono mix

(without dc monitoring via

Right ADC)

111111000

2.543

(3.3)

0.017

1.640

6.537

Analogue mono mix

(with continuous dc

monitoring via Right ADC)

111111100

3.205

(4.2)

0.018

1.670

8.306

Using MICBIAS in 0.9 X

AVDD mode in addition to

any of the above

Set appropriate MICBIAS[1:0] bits in

power management register

+0.255

(+0.45)

-

-

+0.459

Using microphone boost

preamplifiers in addition to

any of the above

Set appropriate MBCTRL[1:0] bits in

register 09h and set LMBE and/or RMBE

bits in registers 02h and 03h

+0.692

(+0.7)

-

-

+1.688

MVDD = 3.3V, AVDD = 3.3V, DBVDD = 3.3V, DCVDD = 1.5V, Low Power Mode, no MICBIAS or mic preamps

OFF

000000000

0.000

(<0.01)

0.000

(<0.01)

0.007

(<0.01)

0.011

(<0.02)

Standby

110000000

1.288

(1.1)

0.007

(<0.01)

0.064

(<0.01)

0.117

Mono (L/R)

111101000 / 111010100

2.993

(3.5)

0.018

1.624

12.173

Stereo / Digital Mono Mix

111111100

4.453

(5.6)

0.031

1.650

17.273

Analogue mono mix

(without dc monitoring via

Right ADC)

111111000

3.684

(4.5)

0.018

1.620

14.648

Analogue mono mix

(with continuous dc

monitoring via Right ADC)

111111100

4.453

(5.6)

0.031

1.660

17.288

Using MICBIAS in 0.9 X

AVDD mode in addition to

any of the above

Set appropriate MICBIAS[1:0] bits in

power management register

+0.47

(+0.85)

-

-

+1.551

Using microphone boost

preamplifiers in addition to

any of the above

Set appropriate MBCTRL[1:0] bits in

register 09h and set LMBE and/or RMBE

bits in registers 02h and 03h

+1.413

(+1.3)

-

-

+4.663