Measurement Computing USB-1208HS-4AO - Manual (Page 16)

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. Analog input specifications
Parameter Condition Specification
A/D converter Analog Devices AD7329
13-bit successive approximation type
Input ranges Software-selectable
per channel  Differential: ±20 V, ±10 V, ±5 V (The voltage level on
each individual AIN input is limited to ±14 V.)
 SE: ±10 V, ±5 V, ±2.5 V, 0 V to 10 V
Number of channels 4 differential, 8 single-ended
Software-selectable
Input configuration Multiplexed
Channel gain queue 8 unique consecutive elements Software-selectable range for each channel
Absolute maximum input
voltage CHx IN to GND ±25 V max (power on)
±12 V max (power off)
Input impedance 35
MΩ min
Input bandwidth (–3 dB) All input ranges 2 MHz typ
Input leakage current ±250 nA typ
Input capacitance 32 pf typ
Offset error drift 5 ppm/°C typ
Gain error drift 25 ppm/°C typ
Maximum working voltage
(signal + common mode) ±20 V ±14 V
±10 V ±11 V
±5 V ±5.5 V
Sample rate 1 S/s to 1 MS/s, software programmable
Sample clock source Internal A/D clock or AICKI
Burst mode Software-selectable, burst rate = 1µs
Throughput Software paced 33 S/s to 4000 S/s typ, system dependent
Scan to PC memory 1 MS/s max
Resolution 13 bits
A/D no missing codes
(uncalibrated) Differential mode 13 bits
Single-ended mode 12 bits
CMRR 60hz 74 dB typ
Crosstalk SE mode, all ranges, 250 kHz
input signal –62 dB typ
Differential mode, all ranges,
250 kHz input signal –78 dB typ