Production Data
WM8737L
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.
MODE DESCRIPTION
POWER MANAGEMENT REGISTER
SETTING
TYP. SUPPLY CURRENTS
TOTAL
POWER
(MILLIAMPS)
(mW)
IAVDD
IDBVDD
IDCVDD
MVDD = 1.8V, AVDD = 1.8V, DBVDD = 1.8V, DCVD = 1.5V, Low Power Mode, no MICBIAS or mic preamps
0.000
0.692
1.978
3.205
2.543
0.000
0.004
0.011
0.018
0.017
0.007
0.009
1.633
1.666
1.640
0.011
1.356
6.029
8.299
6.537
OFF
000000000
Standby
110000000
Mono (L/R)
111101000 / 111010100
111111100
Stereo / Digital Mono Mix
Analogue mono mix
111111000
111111100
(without dc monitoring via
Right ADC)
3.205
0.018
1.670
8.306
Analogue mono mix
(with continuous dc
monitoring via Right ADC)
+0.255
+0.692
-
-
-
-
+0.459
+1.688
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
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
MVDD = 3.3V, AVDD = 3.3V, DBVDD = 3.3V, DCVDD = 1.5V, Low Power Mode, no MICBIAS or mic preamps
0.000
1.288
2.993
4.453
3.684
0.000
0.007
0.018
0.031
0.018
0.007
0.064
1.624
1.650
1.620
0.011
0.117
OFF
000000000
Standby
110000000
12.173
17.273
14.648
Mono (L/R)
111101000 / 111010100
111111100
Stereo / Digital Mono Mix
Analogue mono mix
111111000
111111100
(without dc monitoring via
Right ADC)
4.453
0.031
1.660
17.288
Analogue mono mix
(with continuous dc
monitoring via Right ADC)
+0.47
-
-
-
-
+1.551
+4.663
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
+1.413
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
PD, Rev 4.4, January 2012
9
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
