CyberResearch UMDAS 0802DA - Manual (Page 28)

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
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
Vin = +10 V 70 microamperes (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 250 samples per second (S/s) typ,
PC-dependent Throughput (Note 2)
Continuous scan 48 kilosamples per second (kS/s)
Channel gain queue Up to 16
elements Software configurable channel, range,
and gain.
Differential 14-bits, no missing codes Resolution (Note 3)
Single-ended 13-bits
Integral linearity error ±2 least significant bit (LSB) typ
Differential linearity error ±0.5 LSB typ
±20V range ±3LSB typ. (delta t = 1000 hrs)
±4V range ±6LSB typ. (delta t = 1000 hrs)
Absolute Accuracy Long Term Drift
(Note 4)
±1V range ±8LSB typ. (delta t = 1000 hrs)
2.5VREF accuracy (pin 16) ±36.25 mV max.
Source 5 mA max. 2.5VREF output current (pin 16)
Sink 20 µA min, 100 µA 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, V
in
, the input leakage is approximately equal to (8.181*V
in
-12) µA.
4-1