PIN ASSIGNM ENTS
DIGITAL PIN FUNCTIONS
PIN
FUNCTION
HS 9403-16
FUNCTION
HS 9403-8
LOGIC
FUNCTION
PIN NO STATE DESCRIPTION
NO.
M UX ENABLE
5
7
“ 0”
“ 1”
Disables internal M UX
Enables internal M UX
1
2
3
4
5
6
7
8
CH3 IN
CH2 IN
CH1 IN
CH0 IN
M UX ENABLE
R DELAY
EOC
CH3(+)IN
CH2(+)IN
CH1(+)IN
CHO(+)IN
EOC
“ 0”
Signal acquisition cycle in
progress
A/D conversion in progress
“ 1”
“ 0” to“ 1” Conversion complete
“ 1” to“ 0” Initiates acquisition and
conversion of analog signal
Output of M UX address
register. Straight binary
coding
STROBE
8
STROBE
A8
M UX ADDRESS
OUT
9-12
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
A4
A2
M UX ADDRESS OUT
M UX ADDRESS
IN
13-16
19
Selects M UX for random
address mode. Straight
binary coding
Random address mode
initiated on falling edge of
STROBE
Sequential address mode
Forces M UX address to
CH0 on next falling edge
of STROBE regardless of
LOAD and M UX address
inputs
Enables three-state outputs
bits 9-12
Disables three-state out
puts bits 9-12
Enables three-state outputs
bits 5-8
Disables three-state out
puts bits 5-8
A1
RA8
RA4
RA2
RA1
M UX ADDRESS IN
LOAD
“ 0”
“ 1”
“ 0”
DIGITAL GROUND
+5V
LOAD ENABLE
CLEAR ENABLE
ENABLE (BITS 9-12)
BIT12 OUT(LSB)
BIT 11 OUT
BIT 10 OUT
BIT 9 OUT
ENABLE (BITS 5.8)
BIT 8 OUT
BIT 7 OUT
BIT 6 OUT
BIT 5 OUT
ENABLE (BITS 1-4)
BIT 4 OUT
BIT 3 OUT
BIT 2 OUT
BIT 1 OUT (M SB)
GAIN ADJ
OFFSET ADJ
BIPOLAR INPUT
SAM PLE/HOLD OUT
+ 10V REFERENCE OUT
ANALOG SIGNAL GROUND
ANALOG POW ER GROUND
+15V
CLEAR
20
ENABLE
(BITS 9-12)
21
26
31
“ 0”
“ 1”
“ 0”
“ 1”
“ 0”
“ 1”
ENABLE
(BITS 5-8)
ENABLE
(BITS 1-4)
Enables three-state outputs
outputs bits 1-4
Disables three-state out
puts bits 1-4
ANALOG PIN FUNCTIONS
FUNCTION
PIN NO. DESCRIPTION
R DELAY
6
Connect external resistor to
lengthen S/H acquisition time
when instrumentation AM P is
set for high gain (for normal
operation, R DELAY tied to
+5V).
External gain adjust (optional)
External offset adjust(optional)
For unipolar operation (0 to
+ 10V). connect to pin 39 (S/H
OUT). For Bipolar operation
GAIN ADJUST
OFFSET ADJUST
BIPOLAR INPUT
36
37
38
–15V
EXTERNAL HOLD CAP HIGH
EXTERNAL HOLD CAP LOW
R GAIN LOW
R GAIN HIGH
INSTRU. AM P (+) INPUT
INSTRU. AM P (–) INPUT
CH151N
CH14 IN
CH13IN
CH121N
CH11IN
CH10IN
CH9 IN
CH8 IN
CH7 IN
CH6 IN
CH5 IN
CH4 IN
(
10V). connect to pin 40
(+10V REF OUT)
Sample-Hold output
S/H OUTPUT
39
40
45.46
+10VREFOUT
EXTERNAL HOLD
CAPACITOR
Buffered + 10V reference output
Add external polypropylene,
polystyrene or teflon hold
capacitor to improve S/H droop
rate (optional)
Optional gain selection point.
R = 20k/(G-1). Leave open for G=1
Use when adding additional
external multiplexers for
expanded single-ended or
differential operation (see
Applications Information).
Connect pin 50 to analog
common for HS 9403-16
CH7(-)IN
CH6(-)IN
CH5(-)IN
CH4(-)IN
CH3(-)IN
CH2(-)IN
CH1(-)IN
CHO(-)IN
CH7(+)lN
CH6(+)IN
CH5(+)IN
CH4(+)IN
RGAIN
47.48
INSTRUM ENTATION 49.50
AM P INPUTS
SPECTRUM [ SPECTRUM MICROWAVE, INC. ]
