WM2637

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 1.0 July 99

4

Test Conditions:

Ω, C

temperature range (unless noted otherwise)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

See Note 12

Total harmonic distortion

THD

BW = 20kHz

See Note 12

-61

-50

dB

Spurious free dynamic range

SPFDR

BW = 20kHz

See Note 12

51

62

dB

Reference Configured As Input

Reference input resistance

10

M

Ω

Reference input capacitance

55

pF

Reference feedthrough

+ 1.024V dc, DAC code 0

-60

dB

Reference input bandwidth

DAC code 1024

Slow

Fast

1.0

1.0

MHz

MHz

Reference Configured As Output

Low reference voltage

1.003

1.024

1.045

V

High reference voltage

VDD > 4.75V

2.027

2.048

2.069

V

Output source current

1

mA

Output sink current

-1

mA

Load Capacitance

100

pF

PSRR

-48

dB

Digital Inputs

High level input current

Input voltage = VDD

1

µA

Low level input current

Input voltage = 0V

-1

µA

Input capacitance

8

pF

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.

Zero code error is the voltage output when the DAC input code is zero.

4.

Gain error is the deviation from the ideal full scale output excluding the effects of zero code error.

5.

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.

Zero code error and Gain error temperature coefficients are normalised to full scale voltage.

7.

Output load regulation is the difference between the output voltage at full scale with a 10k

Ω load and 2kΩ load. It is

expressed as a percentage of the full scale output voltage with a 10k

Ω load.

8.

increase.

9.

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.