The INA116 is a complete monolithic FET-input instru-
mentation amplifier with extremely low input bias
current.
Difet
®
inputs and special guarding techniques
yield input bias currents of 3fA at 25°C, and only 25fA
at 85°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 –40°C to +85°C
temperature range.
APPLICATIONS
q
LABORATORY INSTRUMENTATION
q
pH MEASUREMENT
q
ION–SPECIFIC PROBES
q
LEAKAGE CURRENT MEASUREMENT
V+
2
3
4
1
25kΩ
R
G
16
Guard
+
V
IN
Guard
5
6
7
8
Over-Voltage
Protection
A
2
+1
60kΩ
60kΩ
9
Ref
25kΩ
A
3
V
O
Over-Voltage
Protection
+1
A
1
60kΩ
60kΩ
G=1+
50kΩ
R
G
13
INA116
Guard
–
V
IN
Guard
11
Difet
®
; Burr-Brown Corporation
V–
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Operating Temperature ................................................. –40°C to +125°C
Storage Temperature ..................................................... –40°C to +125°C
Junction Temperature .................................................................... +150°C
Lead Temperature (soldering, 10s) ............................................... +300°C
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
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