wm8903 Wolfson Microelectronics plc, wm8903 Datasheet - Page 14

• Manufacturer Part Number: wm8903
• Description: Ultra Low Power Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8903
POWER CONSUMPTION
COMMON TEST CONDITIONS
POWER CONSUMPTION MEASUREMENTS
Single-ended stereo line record - IN1L/R, IN2L/R or IN3L/R pins to ADC output.
Test conditions:
L_MODE = R_MODE = 00b (Single ended)
LIN_VOL = RIN_VOL = 00000b (-1.5dB)
ADC_OSR128 = 0
Variant test conditions
44.1kHz sample rate
8kHz sample rate
Differential stereo record from analogue microphones - IN1L/R, IN2L/R or IN3L/R pins to ADC out.
Test conditions:
L_MODE = R_MODE = 10b (Differential mic)
ADC_OSR128 = 0
Variant test conditions
44.1kHz sample rate
8kHz sample rate
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The WM8903 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.
(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.
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Ambient temperature = +25°C
Audio signal = quiescent (zero amplitude)
Sample rate = 44.1kHz
MCLK = 12MHz
Audio interface mode = Master (LRCLK_DIR=1, BCLK_DIR=1)
1.8
1.8
1.8
1.8
V
V
AVDD
AVDD
3.60
3.40
3.60
3.40
mA
mA
1.2
1.2
1.2
1.2
V
V
DCVDD
DCVDD
1.04
0.50
1.00
0.50
mA
mA
1.8
1.8
1.8
1.8
V
V
DBVDD
DBVDD
0.10
0.03
0.10
0.03
mA
mA
PP, Rev 3.1, August 2009
1.8
1.8
1.8
1.8
V
V
CPVDD
CPVDD
0.00
0.00
0.00
0.00
mA
mA
Pre-Production
TOTAL
TOTAL
mW
mW
7.9
6.8
7.9
6.8
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