Production Data

WM2639

WOLFSON MICROELECTRONICS LTD

Production Data Rev 1.0 July 1999

5

Test Conditions:

Ω, C

temperature range (unless noted otherwise)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Signal to noise ratio

SNR

°C

See Note 12

73

78

dB

Signal to noise and distortion ratio

SNRD

°C

See Note 12

61

67

dB

Total harmonic distortion

THD

°C

See Note 12

-69

-62

dB

Spurious free dynamic range

SPFDR

°C

See Note 12

63

74

dB

Reference configured as input

Reference input resistance

10

M

Ω

Reference input capacitance

55

pF

Reference feedthrough

+ 1.024Vdc, DAC code 0

-60

dB

Reference input bandwidth

DAC code 2048

Slow

Fast

500

900

kHz

kHz

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.

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.

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.