REV. B

–6–

AD22100

USE WITH A PRECISION REFERENCE AS THE SUPPLY

VOLTAGE

While the ratiometric nature of the AD22100 allows for system

operation without a precision voltage reference, it can still be

used in such systems. Overall system requirements involving

other sensors or signal inputs may dictate the need for a fixed

precision ADC reference. The AD22100 can be converted to

absolute voltage operation by using a precision reference as the

supply voltage. For example, a 5.00 V reference can be used to

power the AD22100 directly. Supply current will typically be

500

µA which is usually within the output capability of the refer-

ence. A large number of AD22100s may require an additional

op amp buffer, as would scaling down a 10.00 V reference that

might be found in “instrumentation” ADCs typically operating

from

±15 V supplies.

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

TO-92

0.205 (5.20)

0.175 (4.96)

0.135

(3.43)

MIN

SEATING PLANE

0.210 (5.33)

0.170 (4.58)

0.050

(1.27)

MAX

0.500

(12.70)

MIN

0.019 (0.482)

0.016 (0.407)

SQUARE

0.055 (1.39)

0.045 (1.15)

0.105 (2.66)

0.095 (2.42)

0.105 (2.66)

0.080 (2.42)

0.105 (2.66)

0.080 (2.42)

0.165 (4.19)

0.125 (3.94)

SO-8 (SOIC)

4

5

8

1

0.2440 (6.20)

0.2284 (5.80)

0.1574 (4.00)

0.1497 (3.80)

0.1968 (5.00)

0.1890 (4.80)

0.0500 (1.27)

0.0160 (0.41)

0

°-8°

× 45°

0.0196 (0.50)

0.0099 (0.25)

0.0098 (0.25)

0.0075 (0.19)

SEATING

PLANE

0.0500

(1.27)

BSC

0.0688 (1.75)

0.0532 (1.35)

0.0192 (0.49)

0.0138 (0.35)

0.0098 (0.25)

0.0040 (0.10)