WM2637
Production Data
Test Conditions:
RL = 10kW, CL = 100pF. VDD = 5V ± 10%, VREF = 2.048V and VDD = 3V ± 10%, VREF = 1.024V over recommended operating free-air
temperature range (unless noted otherwise)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
See Note 12
Total harmonic distortion
THD
fs = 400ksps, fOUT = 1kHz,
BW = 20kHz
-61
62
-50
dB
dB
See Note 12
Spurious free dynamic range
SPFDR
fs = 400ksps, fOUT = 1kHz,
BW = 20kHz
51
See Note 12
Reference Configured As Input
Reference input resistance
Reference input capacitance
Reference feedthrough
RREFIN
CREFIN
10
55
MW
pF
VREF = 1VPP at 1kHz
-60
dB
+ 1.024V dc, DAC code 0
Reference input bandwidth
VREF = 0.2VPP + 1.024V dc
DAC code 1024
Slow
1.0
1.0
MHz
MHz
Fast
Reference Configured As Output
Low reference voltage
High reference voltage
Output source current
Output sink current
Load Capacitance
VREFOUTL
VREFOUTH
IREFSRC
1.003 1.024
2.027 2.048
1.045
2.069
1
V
VDD > 4.75V
V
mA
mA
pF
dB
IREFSNK
-1
100
PSRR
-48
Digital Inputs
High level input current
Low level input current
Input capacitance
IIH
IIL
CI
Input voltage = VDD
Input voltage = 0V
1
mA
mA
pF
-1
8
Notes:
1.
Integral non-linearity (INL) is the maximum deviation of the output from the line between zero and full scale (excluding the
effects of zero code and full scale errors).
2.
Differential non-linearity (DNL) is the difference between the measured and ideal 1LSB amplitude change of any adjacent two
codes. A guarantee of monotonicity means the output voltage changes in the same direction (or remains constant) as a change
in digital input code.
3.
4.
5.
Zero code error is the voltage output when the DAC input code is zero.
Gain error is the deviation from the ideal full scale output excluding the effects of zero code error.
Power supply rejection ratio is measured by varying VDD from 4.5V to 5.5V and measuring the proportion of this signal
imposed on the zero code error and the gain error.
6.
7.
Zero code error and Gain error temperature coefficients are normalised to full scale voltage.
Output load regulation is the difference between the output voltage at full scale with a 10kW load and 2kW load. It is
expressed as a percentage of the full scale output voltage with a 10kW load.
8.
9.
IDD is measured while continuously writing code 1512 to the DAC. For VIH < VDD - 0.7V and VIL > 0.7V supply current will
increase.
Typical supply current in power down mode is 10nA. Production test limits are wider for speed of test.
10. Slew rate results are for the lower value of the rising and falling edge slew rates
11. Settling time is the time taken for the signal to settle to within 0.5LSB of the final measured value for both rising and falling
edges. Limits are ensured by design and characterisation, but are not production tested.
12. SNR, SNRD, THD and SPFDR are measured on a synthesised sinewave at frequency fOUT generated with a sampling
frequency fs.
WOLFSON MICROELECTRONICS LTD
PD Rev 1.0 July 99
4
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
