Measurement-computing miniLAB-1008 Bedienungsanleitung PDF herunterladen (Seite 27)

Chapter 4

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog Input

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 voltage range for linear operation,

differential mode

CHx to GND -10 V min, +20V max

Absolute maximum input voltage CHx to GND ±40 V max

Vin = +10 V 70 µA typ

Vin = 0 V -12 µA typ

Input current (Note 1)

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

Software paced 50 S/s

Continuous scan 1.2 kS/s

Throughput

Burst scan to 4K sample

FIFO

8 kS/s

Channel gain queue Up to 8 elements

Software configurable channel, range,

and gain.

Differential 12 bits, no missing codes Resolution (Note 2)

Single-ended 11 bits

CAL accuracy CAL = 2.5 V ±0.05% typ, ±0.25% max

Integral linearity error ±1 LSB typ

Differential linearity error ±0.5 LSB typ

Repeatability ±1 LSB typ

Source 5 mA max CAL current

Sink 20 µA min, 200 nA typ

Trigger source Software selectable External digital: DIO0-DIO3

Note 1:

Note 2:

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.

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

4-1

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