Xycom XVME 590 Manual page 11

XVME-500/590 Manual
February, 1988
1.3.1
Application
As the previous block diagrams show, the analog-to-digital circuitry in the XVME-
500 or XVME-590 consists of the following parts:
VMEbus interface circuitry
Fixed gain amplifier (version 1 only)
Programmable gain amplifier (versions 2 & 3 only)
32-element RAM buffer to hold and separate gain value for up to 32
analog inputs (versions 2 & 3 only)
12-bit
Two eight-channel multiplexers allowing up to 16 SE or 8 DI
signals to be connected to the ADC (expansion kit allows double
signal input); directed by software to select one channel for data
conversion
Resistor programmable gain with addition of a resistor and a
potentiometer
1.3.2
General Operation
As stated before, there are three different versions that the XVME-500 and XVME-
590 are available in and they are:
XVME-500/ 1
XVME-500/2
XVME-590/3
On all versions, the analog input channels can be configured for bipolar or unipolar
operations. The unipolar range is O-10 volts. The bipolar ranges include 25V
Gain capabilities, conversion speeds and throughput frequencies vary with each
version, as displayed in Table 1-l.
Circuitry
resolution analog-to-digital converter with input ranges of
XVME-590/l
XVME-590/2
XVME-590/3
1-5
and