Measurement Computing USB-1608G - Technical Specifications; Analog Input Specifications

16
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. General analog input specifications
Parameter
Condition
Specification
A/D converter type
Successive approximation
ADC resolution
16 bits
Number of channels
8 differential, 16 single-ended
Software-selectable
Input voltage range
±10 V, ±5 V, ±2 V, ±1 V
Software-selectable per channel
Absolute max input voltage
CHx relative to AGND
 ±25 V max (power on)
 ±15 V max (power off)
Input impedance
 1 GΩ (power on)
 820 Ω (power off)
Input bias current
±10 nA
Input bandwidth
All input ranges,
small signal (–3 dB)
750 kHz
Input capacitance
60 pf
Max working voltage (signal
+ common mode)
±10V range
±10.2 V max relative to AGND
±5V range
±10.2 V max relative to AGND
±2V range
±9.5 V max relative to AGND
±1V range
±9.0 V max relative to AGND
Common mode rejection ratio
(f
IN
= 60 Hz, all input
ranges)
86 dB
Crosstalk
Adjacent differential mode
channels, DC to 100 kHz
–75 dB
Input coupling
DC
Sampling rate
0.0149 Hz to 250 kHz; software-selectable
Trigger source
TRIG (see External trigger on page 18)
Sample clock source
Internal A/D clock or external A/D clock (AICKI pin)
Burst mode
4 µs
Software-selectable using the internal A/D clock; always
enabled when using the external clock (AICKI pin).
Throughput
Software paced
33 to 4000 S/s typ, system dependent
Hardware paced
250 kS/s max
Channel gain queue
Up to 16 elements
Software-selectable range for each channel
Warm-up time
15 minutes min