WM8961
Pre-Production
TYPICAL POWER CONSUMPTION
The WM8961 power consumption is dependent on many parameters. Most significantly, it depends on
supply voltages, sample rates, mode of operation, and output loading.
The power consumption on each supply rail varies approximately with the square of the voltage.
Power consumption is greater at fast sample rates than at slower ones. When the digital audio
interface is operating in Master mode, the DVDD current is significantly greater than in Slave mode.
(Note also that power savings can be made by using MCLK as the BCLK source in Slave mode.) The
output load conditions (impedance, capacitance and inductance) can also impact significantly on the
device power consumption.
COMMON TEST CONDITIONS
Unless otherwise stated, the following test conditions apply throughout the following sections:
•
•
•
•
Ambient temperature = +25°C
Audio signal = quiescent (zero amplitude)
Sample rate = 48kHz
MCLK = 12.288MHz
Additional, variant test conditions are quoted within the relevant sections below. Where applicable,
power dissipated in the headphone or line loads is included.
All measurements given in this section are typical and derived from evaluation.
MEASUREMENTS
Stereo line record - LINPUT1 and RINPUT1 pins to ADC output.
Test conditions:
LINVOL = RINVOL = 011111b (0dB)
Variant test conditions
AVDD
DVDD
SPKVDD
MICVDD
TOTAL (see
note 1)
V
mA
7.08
7.08
7.12
6.85
V
mA
V
mA
V
mA
mW
16
48kHz sample rate, quiescent
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
5.0
5.0
5.0
5.0
0.001
0.001
0.001
0.001
2.5
2.5
2.5
2.5
0.001
0.258
0.001
0.001
48kHz sample rate, quiescent, MBSEL=1
48kHz sample rate, -1dBFS Input
16.7
16.1
12.9
1.8
8kHz sample rate (256fS i.e. MCLK =
2.048MHz)
0.30
Note:
1. CPVDD consumed 0.004mA in all cases.
Stereo Playback DAC to Headphones – Low Power Headphone Playback with 16Ω load.
Test conditions
CP_DYN_PWR[1:0] = 0b11 (Dynamic control of charge pump power)
48kHz sample rate
Variant test conditions
AVDD
mA
DVDD
mA
SPKVDD
CPVDD
TOTAL
mW
V
V
V
mA
V
mA
0.54
18.0
59.8
Quiescent
1.8
1.8
1.8
1.79
1.79
1.82
1.8
1.8
1.8
1.55
1.57
1.57
5.0
5.0
5.0
0.002
0.002
0.002
1.8
1.8
1.8
6.99
Po = 2mW/channel
Po = 16mW/channel
38.2
114
PP, August 2009, Rev 3.1
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
