Measurement-computing USB-1208FS Manuel d'utilisateur télécharger pdf (Page 20)

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 volts (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 ±28 V max

Input impedance 122 kΩ

Input current (Note 1) Vin = +10 V 70 µA typ

Vin = 0 V –12 µA typ

Vin = –10 V –94 µA typ

Number of channels Software-selectable 8 single-ended / 4 differential

Input ranges, single-ended mode ±10 V, G=2

Input ranges, differential mode

Software-selectable ±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

Throughput (Note 2) Software paced 250 S/s typ, PC-dependent

Hardware paced 50 kS/s

Channel gain queue Up to 16 elements Software configurable channel, range, and gain.

Resolution (Note 3) Differential 12 bits, no missing codes

Single-ended 11 bits

CAL accuracy CAL = 2.5 V ±36.25 mV 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, 100 µA typ

Trigger source Software-selectable External digital: TRIG_IN

Pacer source Software-selectable  Internal

 External (SYNC), rising edge triggered

 Programmed IO

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 scanning to PC memory is machine dependent.

Note 3: The AD7870 converter only returns 11-bits (0 to 2047 codes) in single-ended mode.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 28 29

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