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
鹵40V
without damage.
The INA115 is laser trimmed for very low offset
voltage (50碌V), drift (0.25碌V/藲C) and high common-
mode rejection (115dB at G=1000). It operates with
power supplies as low as
鹵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 鈥?0擄C to +85擄C tempera-
ture range.
V
O1
1
V+
13
INA115
Feedback
A
1
25k鈩?/div>
25k鈩?/div>
25k鈩?/div>
12
APPLICATIONS
q
SWITCHED-GAIN AMPLIFIER
q
BRIDGE AMPLIFIER
q
THERMOCOUPLE AMPLIFIER
q
RTD SENSOR AMPLIFIER
q
MEDICAL INSTRUMENTATION
q
DATA ACQUISITION
鈥?/div>
V
IN
4
2
3
Over-Voltage
Protection
R
G
14
A
3
11
V
O
G=1+
50k鈩?/div>
R
G
15
+
V
IN
5
Over-Voltage
Protection
A
2
25k鈩?/div>
10
Ref
25k鈩?/div>
25k鈩?/div>
8
V
O2
7
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
1
2
3
4
5
6
7
8
9
10
11
