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Chapter 4

Specifications

All specifications are subject to change without notice.

Typical for 25°C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Analog input specifications

Parameter

Condition

Specification

A/D converter type

Successive approximation type

Input voltage range for linear operation

CHx to GND

Single-ended mode: ±10 V max

Differential mode: –10 V min, +20 V max

Absolute maximum input voltage

CHx to GND

±28 V max

Input impedance

122 kΩ

Input current (Note 1)

= +10 V

70 µA typ

= 0 V

–12 µA typ

= –10 V

–94 µA typ

Number of channels

8 single-ended or 4 differential; software-selectable

Input ranges

Single-ended

±10 V, G=2

Differential

±20 V, G=1

±10 V, G=2

±5 V, G=4

±4 V, G=5

±2.5 V, G=8

±2.0 V, G=10

±1.25 V, G=16

±1.0 V, G=20

Software-selectable

Throughput (Note 2)

Software paced

250 S/s typ, PC-dependent

Hardware paced

0.014 S/s to 50 kS/s

Channel gain queue

Software selectable. 8 elements in SE mode,

4 elements in DIFF mode.

One gain element per channel. Elements must be

unique and listed in ascending order.

Resolution (Note 3)

Differential

12 bits, no missing codes

Single-ended

11 bits

Integral linearity error

±1 LSB typ

Differential linearity error

±0.5 LSB typ

Repeatability

±1 LSB typ

Trigger source

Software-selectable

External digital: TRIG_IN

Software-selectable

Pacer source

Software-selectable

 Internal

 External (SYNC), rising edge triggered

Software-selectable

Note 1: Input current is a function of applied voltage on the analog input channels. For a given input

voltage, V

, the input leakage is approximately equal to (8.181 * V

– 12) µA.

Note 2: Maximum throughput when scanning is machine dependent.

Note 3: The AD7870 converter only returns 11 bits (0 to 2,047 codes) in single-ended mode.

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