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Chapter 4

Specifications

Typical for 25°C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter

Specification

A/D converter type

AD574

Resolution

12 bits

Number of channels

Input type

Current input

Input ranges

4 to 20 mA, 2 to 10 mA, 1 to 5 mA and 0.5 to 2.5 mA, software selectable

Polarity

Unipolar/Bipolar, software selectable

A/D pacing

Software polled

Data transfer

Software polled

A/D conversion time

25 µs

Throughput

20 kS/s, PC dependent

Accuracy

±0.01% of reading ±1 LSB

Differential Linearity error

±1 LSB

Integral Linearity error

±0.5 LSB

No missing codes guaranteed

12 bits

Gain drift (A/D specs)

±25 ppm/°C

Zero drift (A/D specs)

±10 µV/°C

Common mode range

±10 V

CMRR

72 dB

Input leakage current (@ 25 C)

100 nA

Input impedance

100 Ohms

Absolute maximum input voltage

±35 V

Noise distribution (Rate = 1-10 kHz, Average % +/- 2 bins, Average % +/- 1 bin, Average # bins)

4 to 20 mA

100% / 100% / 3 bins

2 to 10 mA

100% / 98.8% / 4 bins

1 to 5 mA

100% / 96.8% / 4 bins

0.5 to 2.5 mA

100% / 98.2% / 5 bins

Power consumption

Table 2. Power consumption specifications

+5 V

620 mA typical, 800 mA max

Environmental

Table 3. Environmental specifications

Operating temperature range

0 to 50 °C

Storage temperature range

-20 to 70 °C

Humidity

0 to 90% non-condensing

1 2 ... 10 11 12 13 14 15 16 17

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