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®
Model No. CI-7599
750 Interface (USB)
11
Appendix A: Specifications
USB 750 Interface
Description
Power:
12 VDC to 20 VDC at 2 A, 2.1 mm jack
Computer Connection:
Universal Serial Bus (USB), 12 Mbps maximum
data transfer rate
Digital Channels:
• 4 input/output channels
• TTL compatible input/output levels with 8 mA
maximum drive current
• Maximum input logic transition time: 500 ns
• Electrostatic Discharge (ESD) protected inputs,
assuming the human body model standard, Mil-
Std-3015.7
• Digital input: Edge sensitive and sampled at 10
KHz (100
µ
s), (1
µ
S resolution for the Motion
Sensor)
Analog Channels:
• 3 identical channels with differential inputs and 1
M ohm impedance
• +/- 10 V maximum usable input voltage range (+/-
12 V absolute maximum input voltage range)
• ESD-protected input similar to that of the digital
channels
• 3 voltage gain settings on each analog channel
(1,10, and 100)
• Small signal bandwidth up to the ADC: 1 MHz for
a gain of 1, 800 KHz for a gain of 10, and 120 KHz
for a gain of 100; input amplifier slew rate: 1.2 V/
µ
s (The actual bandwidth is determined by the
sampling rate of the ADC).
Analog-to Digital Conversion:
• 5 input sources for the 12-bit ADC: channels A-C,
signal generator analog output voltage and current
• Voltage resolution at the ADC input: 4.88 mV
(0.488 mV at a gain of 10; 0.049 mV at a gain of
100)
• Current measurement resolution: 244
µA
, where
each volt measured represents 50 mA
• Offset voltage accuracy < +/- 3 mV (For measuring
full-scale voltages (or 1 V with a gain of 10, etc.),
the total error will be less than +/- 15 mV,
accounting for the gain error in the input amplifier.
• Sample rate range: once every 3600 seconds -
250 KHz (The conversion time between
consecutive channels in a burst is 2.9
µ
s)
• 8x oversampling for improved accuracy for sample
rates <100 Hz.