wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 10

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

WM9081
TYPICAL POWER CONSUMPTION
COMMON TEST CONDITIONS
POWER CONSUMPTION MEASUREMENTS
Off and Standby modes
Test conditions:
•
•
Variant test conditions
Off (default settings)
Off (default settings),
DACDAT, MCLK, BCLK and LRCLK applied
Off (lowest power settings)
DAC to Speaker Playback - DAC input to SPKOUTP/SPKOUTN pins with 4.1Ω + 22μH load.
Test conditions:
•
•
Variant test conditions
DAC to Class D Speaker Playback no signal
DAC to Class D Speaker Playback 0.5W
DAC to Class D Speaker Playback 1.0W
DAC to Class D Speaker Playback 2.0W
w
No clocks applied unless stated
No signal applied unless stated
Slave mode, MCLK = 12.288MHz, LRCLK = 48kHz
Input signal: 0dBFS 1kHz sine wave
The WM9081 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 DBVDD current is significantly greater than 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 speaker or line loads is included.
•
•
•
•
•
•
Ambient temperature = +25°C
Audio signal = quiescent (zero amplitude)
Sample rate = 48kHz
MCLK = 12.288MHz
Audio interface mode = slave
Control mode: software
3.3
3.3
3.3
3.3
3.3
3.3
3.3
V
V
AVDD
AVDD
0.05
0.05
0.01
mA
mA
2.7
2.8
2.8
2.8
1.8
1.8
1.8
1.8
1.8
1.8
1.8
V
V
DCVDD
DCVDD
0.01
0.01
0.00
mA
mA
1.3
1.4
1.4
1.4
1.8
1.8
1.8
1.8
1.8
1.8
1.8
V
V
DBVDD
DBVDD
0.01
0.01
0.00
mA
mA
0.0
0.0
0.0
0.0
5.0
5.0
5.0
5.0
5.0
5.0
5.0
V
V
SPKVDD
SPKVDD
PP, Rev 3.0, April 2009
120.0
225.0
435.0
0.00
0.00
0.00
mA
mA
2.7
Pre-Production
TOTAL
TOTAL
1136.7
2186.7
611.7
0.18
0.18
0.03
24.9
mW
mW
10