AD2S90

REV. D

–3–

AD2S90

Parameter

Min

Max

Units

Test Conditions/Notes

200

ns

DIR to CLKOUT Positive Edge

250

400

ns

CLKOUT Pulsewidth

250

ns

CLKOUT Negative Edge to A, B and NM Transition

Parameter

AD2S90

Units

Test Conditions/Notes

150

ns max

CS to DATA Enable

1

600

ns min

CS to 1st SCLK Negative Edge

250

ns min

SCLK Low Pulse

250

ns min

SCLK High Pulse

100

ns max

SCLK Negative Edge to DATA Valid

600

ns min

CS High Pulsewidth

150

ns max

CS High to DATA High Z (Bus Relinquish)

NOTE

otherwise noted)

LSB

MSB

t*

CSB

SCLK

DATA

Figure 1. Serial Interface

NOTES

°C only to ensure conformance to data sheet limits. Logic output timing tests carried out using

10 pF, 100 k

Ω load.

A

B

90

180

NM

NUMBER OF DEGREES REFERS TO WIDTH RELATIVE TO "A" CYCLE

360

Figure 2. Incremental Encoder

CLKOUT

A, B, NM

DIR

COUNTER IS CLOCKED

ON THIS EDGE

Figure 3. DIR/CLKOUT/A, B and NM Timing