®
INA
115
INA115
Precision
INSTRUMENTATION AMPLIFIER
FEATURES
q
LOW OFFSET VOLTAGE: 50µV max
q
LOW DRIFT: 0.25µV/
°
C max
q
LOW INPUT BIAS CURRENT: 2nA max
q
HIGH COMMON-MODE REJECTION:
115dB min
q
INPUT OVER-VOLTAGE PROTECTION:
±
40V
q
WIDE SUPPLY RANGE:
±
2.25 TO
±
18V
q
LOW QUIESCENT CURRENT: 3mA max
q
SOL-16 SURFACE-MOUNT PACKAGE
DESCRIPTION
The INA115 is a low cost, general purpose instrumen-
tation amplifier offering excellent accuracy. Its versa-
tile three-op amp design and small size make it ideal
for a wide range of applications. Similar to the model
INA114, the INA115 provides additional connections
to the input op amps, A
1
and A
2
, which improve gain
accuracy in high gains and are useful in forming
switched-gain amplifiers.
A single external resistor sets any gain from 1 to
10,000. Internal input protection can withstand up to
±40V
without damage.
The INA115 is laser trimmed for very low offset
voltage (50µV), drift (0.25µV/˚C) and high common-
mode rejection (115dB at G=1000). It operates with
power supplies as low as
±2.25V,
allowing use in
battery operated and single 5V supply systems. Quies-
cent current is 3mA maximum.
The INA115 is available in the SOL-16 surface-mount
package, specified for the –40°C to +85°C tempera-
ture range.
V
O1
1
V+
13
INA115
Feedback
A
1
25kΩ
25kΩ
25kΩ
12
APPLICATIONS
q
SWITCHED-GAIN AMPLIFIER
q
BRIDGE AMPLIFIER
q
THERMOCOUPLE AMPLIFIER
q
RTD SENSOR AMPLIFIER
q
MEDICAL INSTRUMENTATION
q
DATA ACQUISITION
–
V
IN
4
2
3
Over-Voltage
Protection
R
G
14
A
3
11
V
O
G=1+
50kΩ
R
G
15
+
V
IN
5
Over-Voltage
Protection
A
2
25kΩ
10
Ref
25kΩ
25kΩ
8
V
O2
7
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
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©
1992 Burr-Brown Corporation
PDS-1169B
Printed in U.S.A. October, 1993
BURR-BROWN [ BURR-BROWN CORPORATION ]
