INA115 Datasheet, PDF (1/11 Pages) Burr-Brown (TI) – Precision INSTRUMENTATION AMPLIFIER

®
INA115
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
APPLICATIONS
q SWITCHED-GAIN AMPLIFIER
q BRIDGE AMPLIFIER
q THERMOCOUPLE AMPLIFIER
q RTD SENSOR AMPLIFIER
q MEDICAL INSTRUMENTATION
q DATA ACQUISITION
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, A₁ and A₂, 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
V+
1
13
–
4
Over-Voltage
V_IN
Protection
2
3
A₁
25kΩ
INA115
25kΩ
25kΩ
Feedback
12
R_G
14
15
+
5
V_IN
Over-Voltage
Protection
25kΩ
A₂
25kΩ
A₃
25kΩ
11
V_O
Ref
10
G = 1 + ^50kΩ
R_G
8
7
V_O2
V–
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©1992 Burr-Brown Corporation
PDS-1169B
Printed in U.S.A. October, 1993