Measurement-computing USB-1208LS User Manual download pdf (Page 19)

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

Conditions

Specification

A/D converter type

Successive approximation type

Input voltage range for linear operation,

single-ended mode

CHx to GND

±10 V max

Input common-mode voltage range for linear

operation, differential mode

CHx to GND

–10 V min, +20 V max

Absolute maximum input voltage

CHx to GND

±40V max

Input current (Note 1)

Vin = +10 V

70µA typ

Vin = 0V

–12µA typ

Vin = –10 V

–94µA typ

Input impedance

122 kΩ

Number of channels

8 single ended / 4 differential, software

selectable

Input ranges

Single-ended mode

±10V, G=2

Differential mode

±20V, G=1

±10V, G=2

±5V, G=4

±4V, G=5

±2.5V, G=8

±2.0V, G=10

±1.25V, G=16

±1.0V, G=20

Software selectable

Throughput

Software paced

50 S/s

Hardware paced

1.2 kS/s

Burst scan to 4 K sample

FIFO

8 kS/s

Channel gain queue

Up to 8 elements

Software configurable channel, range, and

gain.

Resolution (Note 2)

Differential

12 bits, no missing codes

Single ended

11 bits

CAL accuracy

CAL = 2.5V

±0.05% typ, ±0.25% max

Integral linearity error

±1 LSB typ

Differential linearity error

±0.5 LSB typ

Repeatability

±1 LSB typ

CAL current

Source

5 mA max

Sink

20 µA min, 200 nA typ

Trigger Source

Software selectable

External digital: TRIG_IN

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.

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

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Measurement-computing USB-1208LS User Manual Page 19

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