User guide
Analog Input Modules
(T7420A, AF)
PD
-
7023
Mar
-
06
29
Miscellaneous Input Circuit Specifications
Function
Signal
Mode
Value
I leakage
AI1 through AI16
—
50 nanoA (max.)
Rin (re AGND)
AI1 through AI16
—
100 Mohm (min.)
Rin (re AREF2)
AREF1
—
100 Mohm (min.)
Rin (note 1)
AI1 through AI16
SE
100 Mohm (min.)
CMR (note 2)
AI1 through AI16
SE
51 dB min.
CMR (note
3)
AI1
-
AI16
SE
41 dB min.
CMR (note 4)
AI1 through AI16
SE
66 dB min.
NMR (note 5)
AI1 through AI16
SE
(note 5)
Rin (re AGND)
AI1/2
-
AI15/16
DIFF
100 Mohm (min.)
CMR (note 6)
AI1/2
-
AI15/16
DIFF
72 dB min.
CMR (note 7)
AI1/2
-
AI15/16
DIFF
49 dB min.
CMR (note 8)
AI1/2
-
AI15/16
DIFF
81 dB min.
NMR (note 9)
AI1/2
-
AI15/16
DIFF
(note 9)
Notes:
1)
AI1 through AI8 are referenced to AREF1. AI9 through AI16 are
referenced to AREF2.
2)
CMR: DC to 20 kHz, AI1
-
AREF1 through AI8
-
AREF1, AI9
-
AREF2
throug
h AI16
-
AREF2. Referenced to AGND (model T7420A).
3)
CMR: Same as note 2 except model T7420AF.
4)
CMR: 60Hz, AI1
-
AREF1 through AI8
-
AREF1, AI9
-
AREF2 through AI16
-
AREF2. Referenced to AGND.
5)
Normal mode rejection (single ended).
6)
CMR: DC to 20 kHz, Differential signal referenced to AGND.
7)
CMR: Same as note 6 except model T7420AF.
8)
CMR: 50 Hz, Differential signal referenced to AGND.
9)
Normal mode rejection (differential).