Chapter 4

Specifications

Typical for 25°C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 4-1. Analog input specifications

Parameter

Conditions

Specification

 

 

 

A/D converter type

 

Successive approximation type

Input voltage range for linear operation, single-ended

CHx to GND

±10 volts (V) max

mode

 

 

 

Input common-mode voltage range for linear

CHx to GND

–10 V min, +20 V max

operation, differential mode

 

 

 

Absolute maximum input voltage

CHx to GND

±28 V max

 

Input current (Note 1)

Vin = +10 V

70 microamperes (µA) typ

 

Vin = 0 V

–12 µA typ

 

Vin = –10 V

–94 µA typ

Number of channels

 

8 single-ended / 4 differential,

 

 

software selectable

Input ranges, single-ended mode

 

±10 V,

G=2

Input ranges, differential mode

 

±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 samples per second (S/s) typ,

 

 

PC-dependent

 

Continuous scan

48 kilosamples per second (kS/s)

Channel gain queue

Up to 16

Software configurable channel, range,

 

elements

and gain.

 

Resolution (Note 3)

Differential

14-bits, no missing codes

 

Single-ended

13-bits

 

Integral linearity error

 

±2 least significant bit (LSB) typ

Differential linearity error

 

±0.5 LSB typ

Absolute Accuracy Long Term Drift

±20V range

±3LSB typ. (delta t = 1000 hrs)

(Note 4)

±4V range

±6LSB typ. (delta t = 1000 hrs)

 

±1V range

±8LSB typ. (delta t = 1000 hrs)

2.5VREF accuracy (pin 16)

 

±36.25 mV max.

2.5VREF output current (pin 16)

Source

5 mA max.

 

Sink

20 µA min, 100 µA typ

Trigger source

Software

External digital: TRIG_IN

 

selectable

 

 

Note 1: Input current is a function of applied voltage on the analog input channels. For a given input voltage, Vin, the input leakage is approximately equal to (8.181*Vin-12) µA.

4-1