The INA146 is a precision difference amplifier that
can be used to accurately attenuate high differential
voltages and reject high common-mode voltages for
compatibility with common signal processing voltage
levels. High-voltage capability also affords inherent
input protection. The input common-mode range ex-
tends beyond both supply rails, making the INA146
well-suited for both single and dual supply applica-
tions.
On-chip precision resistors are laser-trimmed to achieve
accurate gain and high common-mode rejection. Ex-
cellent TCR tracking of these resistors assures contin-
ued high precision over temperature.
A 10:1 difference amplifier provides 0.1V/V gain
when the output amplifier is used as a unity-gain
buffer. In this configuration, input voltages up to
鹵100V
can be measured. Gains greater than 0.1V/V
can be set with an external resistor pair without affect-
ing the common-mode input range.
The INA146 is available in the SO-8 surface-mount
package specified for the extended industrial tempera-
ture range, 鈥?0擄C to +85擄C.
APPLICATIONS
q
q
q
q
CURRENT SHUNT MEASUREMENTS
SENSOR AMPLIFIER
SYNCHRONOUS DEMODULATOR
CURRENT AND DIFFERENTIAL LINE
RECEIVER
q
VOLTAGE-CONTROLLED CURRENT
SOURCE
q
BATTERY POWERED SYSTEMS
q
LOW COST AUTOMOTIVE
V+
INSTRUMENTATION
R
1
100k鈩?/div>
R
G1
R
G2
7
R
2
10k鈩?/div>
R
5
10k鈩?/div>
(1%)
5
鈥?/div>
V
IN
2
A2
6
V
O
V
O
= (V
IN
鈥?V
IN
) 0.1 (1 + R
G2
/R
G1
)
+
鈥?/div>
G = 0.1
R
3
100k鈩?/div>
A1
R
4
10k鈩?/div>
INA146
4
V鈥?/div>
1
Ref
8
V
01
V
IN
+
3
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
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