19
V
M
E
bus
In
te
rfac
e
1
Fi
gur
e 1
-1
VM
IV
M
E
-3
1
26A
Hi
gh
Res
o
lu
tion,
I
s
ol
at
ed
Anal
og-
to
--
Di
gi
ta
l Con
v
e
rt
e
r Boar
d
’s Bl
oc
k D
ia
g
ra
m
AUTO-
ZERO
SWITCH
X1
X1
IN_HIGH
REF
CONTROL
IN_LO
RTD 1
RTD 2
RETURN DATA
ISOLATED
GROUND
ISOLATED
GROUND
+5 V REGULATOR
-5 V REGULATOR
DC
VMEbus
INTERFACE
RAM
ERASABLE
PROGRAMMABLE
LOGIC
DSP
E
2
PROM
DSP
BOOT
EPROM
BARRIER
4
+2.5 V
REFERENCE
ADC
ONE OF 16 INDIVIDUAL CHANNELS SHOWN
P1/P2
P3/P4
CH_HIGH
CH_LO
CH_RTD 1
CH_RTD 2
CH_AGND
+5 V
CH_GUARD
ISOLATION
X1
/
DC
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