Chapter 4 Specifications; Analog Input - Measurement Computing USB-1208LS User Manual

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

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 current (Note 1)
Input impedance
Number of channels
Input ranges
Throughput
Channel gain queue
Resolution (Note 2)
CAL accuracy
Integral linearity error
Differential linearity error
Repeatability
CAL current
Trigger Source
Input current is a function of applied voltage on the analog input channels. For a given input voltage,
Note 1:
Vin, the input leakage is approximately equal to (8.181* Vin – 12) µA.
The AD7870 converter only returns 11-bits (0 to 2,047 codes) in single-ended mode.
Note 2:
Table 1. Analog input specifications
Conditions
CHx to GND
CHx to GND
CHx to GND
Vin = +10 V
Vin = 0V
Vin = –10 V
Single-ended mode
Differential mode
Software paced
Hardware paced
BURSTIO to 4 K sample
FIFO
Up to 8 elements
Differential
Single ended
CAL = 2.5V
Source
Sink
Software-selectable
18
Chapter 3
Specification
Successive approximation type
±10 V max
–10 V min, +20 V max
±40V max
70 µA typ
–12 µA typ
–94 µA typ
122 kΩ
8 single ended / 4 differential,
software-selectable
±10V, G=2
±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
50 S/s
1.2 kS/s
8 kS/s
Software configurable channel, range, and
gain.
12 bits, no missing codes
11 bits
±0.05% typ, ±0.25% max
±1 LSB typ
±0.5 LSB typ
±1 LSB typ
5 mA max
20 µA min, 200 nA typ
External digital: TRIG_IN