INT7 - PCI Board of A/D Integration Converters

INT7 is an internal 24-bit A/D converter board that measures the voltages of chromatographic and electrochemical detectors. It contains up to 4 data-acquisition channels on one board (one and two channel versions are also available). The channels are completely independent, sigma delta integrating A/D converters, used for processing positive and negative voltages. The board includes four digital inputs and eight digital outputs. The first four digital outputs are also equipped also with relay contacts. The board is manufactured using the SMT montage and provides excellent reliability and temperature stability.

Full size PCI 2.0, 32 bit PCI slot is required. Low profile or PCI Express slots cannot be used.

INT7 is the direct successor of our classic INT5 ISA card. The two share an identical analog channel design and thus, identical basic electric parameters.

Advantages of the INT7 A/D converter:

No loss of input signal during integration. There are no time delays during which the converter fails to integrate the input signal.
There is no continuous servicing of the input analog switches, which would otherwise cause errors (offset, noise, etc.).
The amount of data entering the computer is substantially smaller, since individual data items already represent partial integrals.

Next steps

Technical data:

	INT7
Converter type	24 bit integrating, delta-sigma integration

Analog inputs	differential

Number of channels	1, 2 or 4 fully independent, mutually isolated

Input range	unipolar and bipolar, each channel independentely: 156, 1250 or 12560 mV

Input impedance	> 10 MOhm

Sample rate	10, 25, 50, 100 Hz

Non-linearity	< 0.0015 %

Temperature dependence	< 10 ppm/°C

Digital inputs	4 TTL (5 V), the first two can be controlled using the built-in opto-couplers

Digital outputs	8 TTL (5V), maximum current load 20 mA), the first four control relays
	INT7

Effective resolution for various acquisition speeds and input ranges:

	10 V	1 250 mV	156 mV
10 Hz	20 bit	19 bit	16 bit

50 Hz	18 bit	17 bit	15 bit

100 Hz	17 bit	15 bit	14 bit
	10 V	1 250 mV	156 mV

Possible combinations:

	WIN XP	WIN 2000	WIN NT	Win 98, Me
INT7	Clarity Clarity Lite CSW32	Clarity Clarity Lite CSW32	Clarity CSW32	Clarity (until 2.4.1) CSW32
	WIN XP	WIN 2000	WIN NT	Win 95, 98, Me

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