WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 175
WM8351GEB/V
Manufacturer Part Number
WM8351GEB/V
Description
Audio CODECs Audio CODEC plus pwr management
Manufacturer
Wolfson Microelectronics
Datasheet
1.WM8351GEBV.pdf
(328 pages)
Specifications of WM8351GEB/V
Number Of Adc Inputs
2
Number Of Dac Outputs
2
Conversion Rate
48 KSPS
Interface Type
Serial (2-Wire, 3-Wire, 4-Wire)
Resolution
12 bit
Operating Supply Voltage
3.7 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
BGA
Minimum Operating Temperature
- 25 C
Number Of Channels
2 ADC/2 DAC
Supply Current
260 uA
Thd Plus Noise
- 83 dB
Audio Codec Type
Stereo
No. Of Adcs
2
No. Of Dacs
2
No. Of Input Channels
8
No. Of Output Channels
6
Adc / Dac Resolution
24bit
Adcs / Dacs Signal To Noise Ratio
95dB
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Production Data
19.5 CALIBRATION
w
The on-chip reference VREF provides a highly accurate reference voltage to the AUXADC. For best
measurement accuracy, the WM8351 provides a way to determine the voltage offset of the
AUXADC’s VREF buffer and the gain error introduced by scaling the AUXADC input. Measured data
can then be adjusted accordingly, eliminating these errors.
To determine the buffer’s offset, the AUXADC AUX3 input is disconnected from the AUX3 pin and
connected to the unbuffered VREF voltage. Note that input scaling must be used, (i.e.
AUXADC_SCALE3 = 10 or 11), in order to ensure that the AUXADC input is within the measurable
range. Measuring this voltage using the buffered VREF as the reference (AUXADC_REF3 = 1)
makes it possible to calculate the combined error.
R145 (91h)
Digitizer Control
(2)
Table 117 AUXADC Calibration
ADDRESS
BIT
2
AUXADC_CAL
LABEL
DEFAULT
0
Configure AUX3 input to be the
VREF supply for AUXADC
calibration.
0 = AUX3 input connected to
AUX3 pin
1 = AUX3 input connected to
unbuffered VREF
PD, March 2010, Rev 4.2
DESCRIPTION
WM8351
175
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