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DNA-AI-218

DNA-AI-218
8-Channel, 24-bit, fully isolated A/D board
 
The DNA-AI-218 is 8-channel fully isolated, simultaneously sampling A/D board compatible with Cube and RACKtangle® chassis respectively. The DNA/DNR versions are electronically identical. The DNA-AI-218 and DNR-AI-218 feature 24-bit resolution, and 7 software selectable input ranges. Each channel also includes and isolated logic-level DIO bit.

An A/D per channel configuration allows channels to be sampled simultaneously at rates up to 120 kS/s each (480 kS/s max aggregate entire board). The A/D per channel configuration virtually eliminates input cross talk and channel settling time issues even when connected to high impedance signal sources.

Each channel is electrically isolated from all other channels as well as from the Cube or RACKtangle chassis. In addition to the isolation, each input is overvoltage protected up to ±40 V (power on or off). The inputs go into a high impedance mode when power is removed making the AI-218 ideal for use in redundant measurement/control applications.

All connections to the DNx-AI-218 are through a female DB37 connector. OEMs will find it easy to find mating connectors for custom cables, while end-users may take advantage of DNA-STP-37 screw terminal panel via the DNA-CBL-37 or DNA-CBL-37S series cables.

Software included with the DNx-AI-218 provides a comprehensive yet easy to use API that supports all popular Windows programming languages as well as supporting programmers using Linux and most real-time operating systems including QNX, RTX, RT Linux, VXworks and more. Finally, the UEIDAQ Framework supplies complete support for those creating applications in data acquisition software packages such as LabVIEW, MATLAB/Simulink, DASYLab or any application which supports ActiveX or OPC servers.
 
Characteristics:
  • For use in “CUBE” chassis
  • 8 differential analog input channels
  • 350 Vrms isolation (channel to channel and channel to chassis)
  • Simultaneous sampling (one A/D converter per channel)
  • Built-in anti-aliasing filters (@ 48% of sample rate)
  • 120 kHz per channel sample rate (480 kHz board max)
  • 24-bit resolution
  • Gains - 1, 2, 4, 8, 16, 32 and 64
 
Technical Specifications
Parameter
Number of channels: 8 fully differential
ADC resolution 24 bits / SAR. (AD7766)
Sampling rate 120 kS/s per channel (max);
480 kS/s max aggregate for entire board
Input bias current < 2 nA typical
Input offset <4 µV; G=1, <2µV; G=2, <1 µV; G>2 (@ 25°C) 
(-40°C to +85°C spec is 2.5 times 25°C offset)
Input INL error < 0.00004 % (40 ppm) max
Input impedance 100 MΩ (min)
Input range ±10 Volt (gain = 1)
Input resolution 1.19 µV (gain = 1), 18.6 nV (gain = 64)
Gains 1, 2, 4, 8, 16, 32, 64
Common mode rejection 110 dB typical
Chan to Chan crosstalk < 1 µVrms
Open input detection current 100 µA
Isolation 350 Vrms (channel to channel and channel 
to chassis)
Digital I/O bits 8 (one per isolated A/D channel)
Digital I/O logic levels Input: 5/3.3 V levels, Output: 3.3 V levels
Overvoltage protection -40V to +40V (power on or off)
Power off leakage current < 10 µA (-40V to + 40V)
Power consumption 4.5 W max
Operating temp. (tested) -40°C to +85°C
Operating humidity 95%, non-condencing
Vibration IEC 60068-2-6 5 g, 10-500 Hz, sinusoidal
IEC 60068-2-64 5 g (rms), 10-500Hz, broadband random
Shock IEC 60068-2-27 50 g, 3 ms half sine, 18 shocks @ 6 orientations
30 g, 11 ms half sine, 18 shocks @ 6 orientations
MTBF 500,000 hours