Specifications; Analog Input - Measurement Computing USB-1408FS User Manual

Specifications

Typical for 25°C unless otherwise specified.
Specifications in italic text are guaranteed by design.

Analog input

Parameter
A/D converter type
Input voltage range for linear operation, single-ended
mode
Input common-mode voltage range for linear operation,
differential mode
Absolute maximum input voltage
Input impedance
Input current (Note 1)
Number of channels
Input ranges, single-ended mode
Input ranges, differential mode
Throughput (Note 2)
Channel gain queue
Resolution (Note 3)
Integral linearity error
Differential linearity error
Absolute accuracy long term drift
(Note 4)
2.5VREF accuracy (pin 16)
2.5VREF output current (pin 16)
Trigger source
Input current is a function of applied voltage on the analog input channels. For a given input
Note 1:
voltage, V
Table 1. Analog input specifications
, the input leakage is approximately equal to (8.181*V
in
Conditions Specification
Successive approximation type
CHx to GND ±10 volts (V) max
–10 V min, +20 V max
CHx to GND
CHx to GND ±28 V max
122K Ohms
Vin = +10 V 70 microamperes (µA) typ
–12 µA typ
Vin = 0 V
Vin = –10 V –94 µA typ
8 single-ended / 4 differential, software
selectable
±10 V,
±20 V,
±10 V,
±5 V,
±4 V,
±2.5 V,
±2.0 V,
±1.25 V, G=16
±1.0 V,
Software selectable
Software paced
250 samples per second (S/s) typ,
PC-dependent
Continuous scan 48 kilosamples per second (kS/s)
Up to 16 Software configurable channel, range,
elements and gain.
Differential 14-bits, no missing codes
Single-ended 13-bits
±2 least significant bit (LSB) typ
±0.5 LSB typ
±20V range ±3LSB typ. (delta t = 1000 hrs)
±4V range ±6LSB typ. (delta t = 1000 hrs)
±1V range ±8LSB typ. (delta t = 1000 hrs)
±36.25 mV max.
Source 5 mA max.
Sink 20 µA min, 100 µA typ
Software External digital: TRIG_IN
selectable
26
Chapter 4
G=2
G=1
G=2
G=4
G=5
G=8
G=10
G=20
-12) µA.
in