DAC0832 datasheet(19/28 Pages) NSC

19 / 28 page

DAC0830 Series Application Hints

(Continued)

2.8 Miscellaneous Application Hints

These converters are CMOS products and reasonable care

should be exercised in handling them to prevent catastrophic

failures due to static discharge.

Conversion accuracy is only as good as the applied refer-

ence voltage so providing a stable source over time and

temperature changes is an important factor to consider.

A “good” ground is most desirable. A single point ground

distribution technique for analog signals and supply returns

keeps other devices in a system from affecting the output of

the DACs.

During power-up supply voltage sequencing, the −15V (or

−12V) supply of the op amp may appear first. This will cause

the output of the op amp to bias near the negative supply

potential. No harm is done to the DAC, however, as the

on-chip 15 k

Ω feedback resistor sufficiently limits the current

flow from I

OUT1 when this lead is internally clamped to one

diode drop below ground.

Careful circuit construction with minimization of lead lengths

around the analog circuitry, is a primary concern. Good high

frequency supply decoupling will aid in preventing inadvert-

ant noise from appearing on the analog output.

Overall noise reduction and reference stability is of particular

concern when using the higher accuracy versions, the

DAC0830 and DAC0831, or their advantages are wasted.

3.0 GENERAL APPLICATION IDEAS

The connections for the control pins of the digital input

registers are purposely omitted. Any of the control formats

discussed in Section 1 of the accompanying text will work

with any of the circuits shown. The method used depends on

the overall system provisions and requirements.

The digital input code is referred to as D and represents the

decimal equivalent value of the 8-bit binary input, for ex-

ample:

Binary Input

Pin 13

Pin 7

Decimal

MSB

LSB

Equivalent

1111

255

0000

128

0100

0000

Gain and Linearity Error

Variation vs. Temperature

00560834

FIGURE 18.

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