WM8234
Product Brief
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD = LDOVDD = DBVDD = 3.3V , AGND = LDOGND = DBGND= 0V, TA = 25C, MCLK= 23.3MHz unless otherwise stated.
PARAMETER
SYMBOL
TEST
MIN
TYP
MAX
UNIT
CONDITIONS
Overall System Specification (including 10-bit ADC, PGA, Offset and CDS functions)
Conversion rate per channel
Full-scale input voltage range
(see Note 1)
5
23.3
MSPS
Vp-p
Vp-p
Vp-p
Vp-p
V
ADCFS=0, Max Gain
ADCFS=0, Min Gain
ADCFS=1, Max Gain
ADCFS=1, Min Gain
SF_INP=0
0.12
2.0
0.18
3.0
Input signal limits (see Note 2)
VIN
CIN
AGND-0.3
AGND
AVDD+0.3
AGND+1.2
SF_INP=1
V
Input capacitance
Inputs to AGND
10
20
pF
Full-scale transition error
Gain = 0dB;
mV
AGAIN[4:0] = 02(hex)
DGAIN[11:0] = 6AB(hex)
Zero-scale transition error
Gain = 0dB;
20
mV
AGAIN[4:0] = 02(hex)
DGAIN[11:0] = 6AB(hex)
Differential non-linearity
DNL
INL
10-bit
10-bit
0.5
1
LSB
LSB
%
Integral non-linearity (pk-pk/2)
Channel to channel gain matching
Min Gain
Max Gain
5
15
0.3
%
Output noise
Unity Gain
(Unused channels grounded)
10-bit
LSB rms
Channel to channel crosstalk
+/-0.5
12
LSB
Programmable Gain Amplifier
Total Resolution (Ga + Gd)
Analogue Gain
GT
Ga
bits
V/V
V/V
V/V
V/V
0.6 + 0.3 * AGAIN[4:0]
Max gain, each channel (Ga)
Min gain, each channel (Ga)
Digital Gain
Ga MAX
Ga MIN
Gd
AGAIN[4:0] = 1F(hex)
AGAIN[4:0] = 0(hex)
9.9
0.6
DGAIN[11:0] / 211
Max gain, each channel (Gd)
Min gain, each channel (Gd)
Max gain, each channel
(Ga + Gd)
Gd MAX
Gd MIN
DGAIN[11:0] = FFF(hex)
DGAIN[11:0] = 400 (hex)
AGAIN[4:0] = 1F(hex)
DGAIN[11:0] = FFF(hex)
AGAIN[4:0] = 0(hex)
2
V/V
V/V
V/V
0.5
19.8
GT
MAX
Min gain, each channel
(Ga + Gd)
GT
0.3
16
V/V
MIN
DGAIN[11:0] = 400 (hex)
Analogue to Digital Converter
Resolution
bits
Speed
70
MSPS
Notes:
1.
Full-scale input voltage denotes the differential input signal amplitude (VIN-VRLC in non-CDS mode, VIN-RESET
level in CDS mode) that can be gained to match the ADC full-scale input range.
Input signal limits are the limits within which each input voltage and VRLC reference must lie.
2.
Product Brief, Rev 3.0, February 2012
8
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
