VA2D


	Vigilant Technologies, Inc.


VA2D

		16 Channel Analog Input

			Specifications

			Ordering Information

	Description:

Vigilant's ValuePack A2D High Density I/O modules are a low cost approach to add just the right amount of analog input channels to an I/O subsystem built around Vigilant's SlotSaver® multifunction I/O coprocessor boards or any IndustryPack carrier board. The A2D module inputs 16 single-ended analog signals, all in a single wide IndustryPack formfactor. Use of the 16 channel module provides for a maximum of 64 analog input channels on a single SlotSaver® board. The conversion has an accuracy of 12 bits or 0.025% with an accuracy of 3/4 of a bit of resolution.

If gain and offset calibration is needed, two input lines may be jumped to ground and the 5 volt reference. During initialization these may be read and stored on the carrier board for use during run-time when an adjustment can be made in the software driver. This feature is ideal for modules installed on intelligent carrier boards, such as Vigilant's SlotSaver boards, where the I/O coprocessor can apply the gain and offset adjustment prior to delivering the conversion values.

The converter performs a conversion sequence without processor intervention sampling sixteen channels specified in the sequencer. The sequencing of the channel selection is made during initialization when 16 channel numbers are written into RAM storage. Channel numbers are then read from this sequence; for example, if all 16 channels are desired, then sequence RAM is set to channel 1, 2, ... through 16. If only channel one is desired then the RAM is set to 1, 1, 1, ..., 1. Conversion cycles may be set to continuous mode when once started, continues until stopped. The start of a conversion cycle can be externally triggered or host commanded.

Each channel's digital conversion value is placed in a FIFO buffer that can be accessed by the SlotSaver's CPU. Up to 1K samples of data may be buffered. A maskable interrupt mat be sent to the SlotSaver board when the buffer is not empty or half full.

The 50 pin I/O connector includes the sixteen analog input channels each separated by ground pin permitting the use of grounded and shielded cabling for maximum noise protection, a 5 volt reference, and an external trigger signal. The multi-layered circuit board includes two layers dedicated to power planes for maximum noise protection.

The ID Prom on the board can be used to identify which version of the A2D module is installed and the number of channels available.


Specifications

Analog Inputs: 16 single-ended A/D Converter: AD7875 or AD7876 Reference Inputs: Ground and +5V may be tied to two channel and used in software driver as reference. Input Voltage Ranges: -5 to +5V 0 to +10V Resolution: 12 bits Accuracy: +3/4 lsb nonlinearity Dynamic Performance: SNR 70dB, THD -80dB Gain and Offset: Adjusted by ground and voltage reference if used Temperature drift: +60 ppm/°C max. Throughput: 100,000 samples per second ADC Data Format: 16 bits, two's complement, hardware sign extended Programmability: Sequencing: each of 16 channel numbers configured during initialization. Trigger: external or command mode: one time or continuous. Status register: busy, running, once/continuous, FIFO empty, FIFO half full, FIFO full, conversion error Logic Interface: wait states: FIFO read and channel sequence writes = one, all others = zero Interrupts: Interrupt on not-empty or half full, each maskable. Software programmable interrupt vector supporting IP INTACK Dimensions: 1.8 x 3.9 x 0.340 inches Power reqs: 150 ma @ 5V typical 25 ma @ +12V typical 25 ma @ -12V typical Environmental: Operating Temperature: 0 to 70°C Humidity: 5 to 95% noncondensing Storage Temperature: -20 to +85°C


	I/O Connector Pin Assignment:

1:	Gnd
2:	Analog Input Chl 1
3, 4:	Gnd
5:	Analog Input Chl 2
6, 7:	Gnd
8:	Analog Input Chl 3
9, 10:	Gnd
11:	Analog Input Chl 4
12, 13:	Gnd
14:	Analog Input Chl 5
15, 16:	Gnd
17:	Analog Input Chl 6
18, 19:	Gnd
20:	Analog Input Chl 7
21, 22:	Gnd
23:	Analog Input Chl 8
24, 25:	Gnd
26:	Analog Input Chl 9
27, 28:	Gnd
29:	Analog Input Chl 10
30, 31:	Gnd
32:	Analog Input Chl 11
33, 34:	Gnd
35:	Analog Input Chl 12
36, 37:	Gnd
38:	Analog Input Chl 13
39, 40:	Gnd
41:	Analog Input Chl 14
42, 43:	Gnd
44:	Analog Input Chl 15
45, 46:	Gnd
47:	Analog Input Chl 16
48:	Gnd
49:	Vref +5V
50:	External Trigger


	Order Information:

		HD-VA2D-16x - 16 Line Analog Input I/O Module (x takes the values: a = +5V, b: 0 to +10V)


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	Copyright © 1998 Vigilant Technologies, Inc. Last modified: July 08, 1998


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