wm8961 Wolfson Microelectronics plc, wm8961 Datasheet - Page 12

• Manufacturer Part Number: wm8961
• Description: Ultra-low Power Stereo Codec With 1w Stereo Class D Speaker Drivers And Ground Referenced Headphone Drivers
• Manufacturer: Wolfson Microelectronics plc

1.
TYPICAL POWER CONSUMPTION
COMMON TEST CONDITIONS
MEASUREMENTS
Note:
w
WM8961
Stereo line record - LINPUT1 and RINPUT1 pins to ADC output.
Test conditions:
LINVOL = RINVOL = 011111b (0dB)
Variant test conditions
48kHz sample rate, quiescent
48kHz sample rate, quiescent, MBSEL=1
48kHz sample rate, -1dBFS Input
8kHz sample rate (256fS i.e. MCLK =
2.048MHz)
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
Quiescent
P
P
o
o
= 2mW/channel
= 16mW/channel
CPVDD consumed 0.004mA in all cases.
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.
Unless otherwise stated, the following test conditions apply throughout the following sections:
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.
•
•
•
•
Ambient temperature = +25°C
Audio signal = quiescent (zero amplitude)
Sample rate = 48kHz
MCLK = 12.288MHz
1.8
1.8
1.8
1.8
1.8
1.8
1.8
V
V
AVDD
AVDD
7.08
7.08
7.12
6.85
1.79
1.79
1.82
mA
mA
1.8
1.8
1.8
1.8
1.8
1.8
1.8
V
V
DVDD
DVDD
0.30
1.55
1.57
1.57
mA
mA
1.8
1.8
1.8
5.0
5.0
5.0
5.0
5.0
5.0
5.0
V
V
SPKVDD
SPKVDD
0.001
0.001
0.001
0.001
0.002
0.002
0.002
mA
mA
2.5
2.5
2.5
2.5
1.8
1.8
1.8
V
V
PP, August 2009, Rev 3.1
MICVDD
CPVDD
0.001
0.258
0.001
0.001
0.54
18.0
59.8
mA
mA
Pre-Production
TOTAL (see
TOTAL
note 1)
6.99
38.2
mW
114
16.7
16.1
12.9
mW
16
12