The INA116 is a complete monolithic FET-input instru-
mentation amplifier with extremely low input bias
current.
Difet
廬
inputs and special guarding techniques
yield input bias currents of 3fA at 25擄C, and only 25fA
at 85擄C. Its 3-op amp topology allows gains to be set
from 1 to 1000 by connecting a single external resistor.
Guard pins adjacent to both input connections can be
used to drive circuit board and input cable guards to
maintain extremely low input bias current.
The INA116 is available in 16-pin plastic DIP and SOL-16
surface-mount packages, specified for the 鈥?0擄C to +85擄C
temperature range.
APPLICATIONS
q
LABORATORY INSTRUMENTATION
q
pH MEASUREMENT
q
ION鈥揝PECIFIC PROBES
q
LEAKAGE CURRENT MEASUREMENT
V+
2
3
4
1
25k鈩?/div>
R
G
16
Guard
+
V
IN
Guard
5
6
7
8
Over-Voltage
Protection
A
2
+1
60k鈩?/div>
60k鈩?/div>
9
Ref
25k鈩?/div>
A
3
V
O
Over-Voltage
Protection
+1
A
1
60k鈩?/div>
60k鈩?/div>
G=1+
50k鈩?/div>
R
G
13
INA116
Guard
鈥?/div>
V
IN
Guard
11
Difet
廬
; Burr-Brown Corporation
V鈥?/div>
International Airport Industrial Park 鈥?Mailing Address: PO Box 11400, Tucson, AZ 85734 鈥?Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 鈥?Tel: (520) 746-1111 鈥?Twx: 910-952-1111
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