WM8973LGEFL/V Wolfson Microelectronics, WM8973LGEFL/V Datasheet - Page 46

• Manufacturer Part Number: WM8973LGEFL/V
• Description: Audio CODECs Stereo Codec with H/P Spkr
• Manufacturer: Wolfson Microelectronics

Specifications of WM8973LGEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8973L
w
SAVING POWER BY REDUCING OVERSAMPLING RATE
The default mode of operation of the ADC and DAC digital filters is in 128x oversampling mode.
Under the control of ADCOSR and DACOSR the oversampling rate may be halved. This will result in
a slight decrease in noise performance but will also reduce the power consumption of the device.
Table 43 ADC and DAC Oversampling Rate Selection
SAVING POWER AT LOW SUPPLY VOLTAGES
The analogue supplies to the WM8973L can run from 1.8V to 3.6V. By default, all analogue circuitry
on the device is optimized to run at 3.3V. This set-up is also good for all other supply voltages down
to 1.8V. However, at lower voltages, it is possible to save power by reducing the internal bias
currents used in the analogue circuitry. This is controlled as shown below.
R24 (18h)
Additional Control
(2)
R23 (17h)
Additional
Control(1)
REGISTER
ADDRESS
REGISTER
ADDRESS
7:6
BIT
1
0
VSEL
[1:0]
LABEL
BIT
ADCOSR
DACOSR
11
DEFAULT
LABEL
0
0
Analogue Bias optimization
00: Lowest bias current, optimized for AVDD=1.8V
01: Low bias current, optimized for AVDD=2.5V
1X: Default bias current, optimized for AVDD=3.3V
DEFAULT
DESCRIPTION
ADC oversample rate select
1 = 64x (lowest power)
0 = 128x (best SNR)
DAC oversample rate select
1 = 64x (lowest power)
0 = 128x (best SNR)
DESCRIPTION
Advanced Information
AI Rev 3.2 July 2004
46