WM8976 Wolfson Microelectronics Ltd., WM8976 Datasheet - Page 12

• Manufacturer Part Number: WM8976
• Description: The WM8976 is a low power, high quality stereo codec designed for portable applications such as Digital still camera or Digital Camcorde
• Manufacturer: Wolfson Microelectronics Ltd.

WM8976
POWER CONSUMPTION
Table 1 Power Consumption
w
Off
Sleep (VREF maintained, no clocks)
MIC Record (8kHz)
Stereo 16Ω HP Playback (48kHz, quiescent)
Stereo 16Ω HP Playback (48kHz, white noise)
Stereo 16Ω HP Playback (48kHz, sine wave)
Notes:
1.
2.
3.
DBVDD Current will increase with greater loading on digital I/O pins.
5 Band EQ is enabled.
AVDD standby current will fall to nearer 15uA when thermal shutdown sensor is disabled.
2
Typical current consumption for various scenarios is shown below.
ESTIMATING SUPPLY CURRENT
When either the DAC or ADC is enabled approximately 7mA will be drawn from DCVDD when
DCVDD=1.8V and fs=48kHz. When the PLL is enabled approximately 1.5mA additional current will
be drawn from DCVDD.
As a general rule, digital supply currents will scale in proportion to sample rates. Supply current for
analogue and digital blocks will also be lower at lower supply voltages.
Power consumed by the output drivers will depend greatly on the signal characteristics. A quiet
signal, or a signal with long periods of silence will consume less power than a signal which is
continuously loud.
Estimated supply current for the analogue blocks is shown in Table 2. Note that power dissipated in
the load is not shown.
MODE
2
2
2
0.04
0.04
4.1
3.3
5.4
18
AVDD
(3.0V)
(mA)
3
0.0008
1.0
0.0008
6.2
7.3
6.7
DCVDD
(1.8V)
(mA)
<0.0001
<0.0001
0.001
0.004
0.004
0.004
DBVDD
PP Rev 3.0 April 2006
(3.0V)
(mA)
1
Pre-Production
0.12
0.12
14.1
21.1
29.4
66.1
POWER
TOTAL
(mW)
12