WM8987L
TYPICAL PERFORMANCE
POWER CONSUMPTION
Pre-Production
The power consumption of the WM8987L 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 WM8987L.
•
Operating mode: Significant power savings can be achieved by always disabling parts of the WM8987L that are not
used (e.g. mic pre-amps, unused outputs, DAC, ADC, etc.)
Control Register
Code
POF-01
POF-02
POF-03
PST-01
PST-02
PST-03
PPB-01
PPB-02
PPB-03
PPS-01
PPS-02
PPS-03
PPC-01
PPC-02
PPC-03
PRD-01
PRD-02
PRD-03
PRS-01
PRS-02
PRS-03
PRL-01
PRL-02
PRL-03
PDL-01
PDL-02
PDL-03
Bit
OFF
VMIDSEL
R25 (19h)
R26 (1Ah)
R24 (18h) R23
VSEL
Other settings
AVDD
DCVDD
DBVDD
HPVDD
Tot. Power
VREF
AINL
AINR
ADCL
ADCR
MICB
DIGENB
DACL
DACR
ROUT1
LOUT2
ROUT2
MONO
OUT3
OUT3SW
ROUT2INV
ADCOSR
DACOSR
Standby
(500 KOhm VMID string)
BTL Headset Stereo Playback
0.1mW/channel into 32 Ohm load
Single-ended Headset Stereo Playback
0.1mW/channel into 32 Ohm load
Single-ended Headset Stereo Playback
(capless mode using OUT3)
0.1mW/channel into 32 Ohm load
Differential mono mic record
(LINPUT1-RINPUT1)
Single-ended mono mic record
(from LINPUT1)
Single-ended stereo line record
(from L/RINPUT1)
Simultaneous record and playback
(stereo, line-in / line-out)
00 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 11
01
00
10 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 11
01
00
01 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 11
01
00
01 1 0 0 0 0 0 0 1 1 0 1 1 0 0 0 0 1 1 11
01
00
01 1 0 0 0 0 0 0 1 1 0 1 1 0 1 0 0 1 1 11
01
00
01 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 1 11
01
00
01 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 1 11
01
00
01 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 1 1 11
01
00
01 1 1 1 1 1 0 0 1 1 0 1 1 0 0 0 0 1 1 11
01
00
Clocks stopped
Interface Stopped
LINSEL=11
LMICBOOST=10
DATSEL=01
LMICBOOST=10
DATSEL=01
V
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
I (mA)
0.000
0.000
0.000
0.482
0.310
0.184
2.573
2.052
1.297
2.232
1.778
1.126
2.229
1.776
1.126
3.551
3.077
2.388
3.196
2.799
2.221
4.532
4.037
3.313
6.295
5.454
4.212
V
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
3.3
2.0
1.5
I (mA)
0.010
0.007
0.007
0.011
0.008
0.007
4.601
2.371
1.750
4.662
2.411
1.758
4.662
2.408
1.757
4.883
2.255
1.584
4.888
2.270
1.588
4.917
2.281
1.605
7.836
3.837
2.760
V
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
3.3
2.5
1.8
I (mA)
0.000
0.000
0.000
0.000
0.000
0.000
0.248
0.175
0.119
0.248
0.175
0.119
0.248
0.175
0.119
0.298
0.213
0.148
0.295
0.212
0.146
0.287
0.206
0.142
0.286
0.206
0.142
V
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
3.3
2.7
1.8
I (mA)
0.000
0.000
0.000
0.000
0.000
0.000
4.291
4.314
3.879
2.005
2.021
1.856
4.007
4.007
3.674
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.000
0.679
0.711
0.364
mW
0.033
0.014
0.011
1.627
0.853
0.342
38.653
22.368
12.156
30.185
15.517
8.219
36.782
20.868
11.490
28.816
13.350
6.941
27.651
12.627
6.643
32.129
15.977
8.627
49.817
24.835
12.632
Table 1 Typical Supply Current Consumption
Notes:
1.
2.
All figures are at T
A
= +25
o
C, Slave Mode, fs = 48kHz, MCLK = 12.288 MHz (256fs), with zero signal (quiescent)
The power dissipated in the headphone or speaker is not included in the above table.
w
PP Rev 3.0 January 2007
8
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
