WM2148

Production Data

WOLFSON MICROELECTRONICS LTD

PD Rev 1.1 February 2001

6

Digital Outputs

Output LOW level

µA0.4

V

Output HIGH level

µA2.6

V

High Impedance Output Current

±10

µA

TERMINOLOGY

1.

DNL is the variation in the analogue step size associated with one digital output code across the input range,

normalised to full scale.

2.

INL is the maximum deviation of the analogue input voltage associated with a digital code from its ideal value,

normalised to full scale. Using the ‘best fit’ method, ideal values are taken from a straight line fitted to the ADC curve.

The INL figure thus obtained therefore characterises linearity only and is not affected by gain and offset errors.

3.

SNR is the ratio in dB of signal to noise amplitude when a full-scale sine wave is applied to the input.

4.

THD is the ratio in dB of the sum of all harmonics to signal amplitude when a full scale sine wave is applied to the

input.

5.

SFDR is the amplitude ratio the output signal to the largest spur (artifact) produced by the device.

t

d

ANALOGUE

INPUT

CLK

S0

S1

S2

S3

S4

S5

S6

S7

S8

S9

S10

S11

S12

OUTPUT DATA

0

123456789

10

11

12

13

S13

S14

S15

14

15

16

S16

S0

S1

S2

S3

S4

S5

S6

Latency

Figure 1 Latency

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Clock Timing

Clock Frequency

CS = Low

0.1

8

8

MHz

Output Delay Time

CS = Low

25

ns

Latency

CS = Low

9.5

cycles

OEB

CSB

D[0:13]

A[0:1]

DATA

XX

ADDRESS

t

su(OE-ACS)

t

dis

t

h(A)

t

en

t

h(CS)

Figure 2 Read Timing