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CHAPTER 1
INTRODUCTION
1.1
FUNCTIONAL OVERVIEW
General
The A X - 1 6 is a low-cost, high-resolution (16 bit), analog input board for ISA and EISA bus
computers (IBM PC/XT/AT or compatible). An integrating A/D converter performs up to 16
conversions/sec while ensuring repeatability in noisy environments. Eight differential input channels
offer 16-bit resolution (15 bit
+
sign). Figure 1-1 is a block diagram of the ADC-16.
1 m A
SOURCE O -
-
-
Vref
r,
( + 5
V )
MUX
CHO HI
CHO
LO
C H I HI
CH1
LO
C H 2 HI
C H 2
LO
C H 3 HI
C H 3 LO
C H 4
HI
C H 4
LO
C H 5 HI
C H 5
LO
C H 6 HI
C H 6
LO
C H 7 HI
C H 7
LO
L.L. GND
L.L. GND
L.L.
GND
GAINS
1,
1 0 . 100
I
SCALING
fi
-
i 3 . 2 7 6 7
I
. ,
1
7
0
CONTROL/SiATUS
MUX & GAIN
& INTERRUPT
SELECT REGISTER
CONTROL REGISTER
I
I
INTERNAL DATA
aus
COMMON
N.3.
N.C.
COMMOlv
N.O.
N.C
OPD
C=:
E X 1
E X 2
EX4
IPO
IP
1
+ 5
V
OUT
POWER COU
POWER COM
I
U
I
IBM
PC
BUS
Figure
1-1.
Block diagram
of
the ADC-16.
Gains of 1,10, and
100
are software-programmable.
A
single gain adjustment sets the full scale of
every range.
No
additional adjustments are required since the zero of every range is automatically
corrected.
Additional features include two TTL compatible, general-purpose digital outputs and two general-
purpose TTL/CMOScompatible digital inputs. The digital outputs also drive two internal Form C
relays on the ADC-16. These relays
are
available for switching and expansion applications.
1 - 1
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