WM8351GEB/V Wolfson Microelectronics, WM8351GEB/V Datasheet - Page 175

• Manufacturer Part Number: WM8351GEB/V
• Description: Audio CODECs Audio CODEC plus pwr management
• Manufacturer: Wolfson Microelectronics

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

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