DAC08CS datasheet(15/20 Pages) AD

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DAC08

Rev. C | Page 15 of 20

RC damping of the output is difficult to prevent while main-

taining adequate sensitivity. However, the major carry from

01111111 to 10000000 provides an accurate indicator of settling

time. This code change does not require the normal 6.2 time

constants to settle to within ±0.2% of the final value, and thus

settling time is observed at lower values of IREF.

DAC08 switching transients or “glitches” are very low and can

be further reduced by small capacitive loads at the output at a

minor sacrifice in settling time. Fastest operation can be

obtained by using short leads, minimizing output capacitance

and load resistor values, and by adequate bypassing at the

supply, reference, and VLC terminals. Supplies do not require

large electrolytic bypass capacitors because the supply current

drain is independent of input logic states; 0.1 µF capacitors at

the supply pins provide full transient protection.

RREF

+15V

IOUT

VIN

R15

+VREF

0.01

µF

–15V

Ω

µF

MINIMUM

CAPACITANCE

+5V

0.1

µF

FOR TURN-ON, VL =2.7V

FOR TURN-OFF, VL =0.7V

Ω

µF

Ω

100k

Ω

µF

VOUT 1×

PROBE

15k

Ω

–15V

0.1

µF

8 9 10 11 12

316

0.1

µF

0.1

µF

DAC08

+0.4V

–0.4V

VCL

0.7V

Figure 33. Settling Time Measurement

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