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®
INA146
®
INA146
©1999 Burr-Brown Corporation PDS-1491A Printed in U.S.A. September, 1999
High-Voltage, Programmable Gain
DIFFERENCE AMPLIFIER
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
For most current data sheet and other product
information, visit www.burr-brown.com
INA146
DESCRIPTION
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
±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, –40°C to +85°C.
FEATURES
● HIGH COMMON-MODE VOLTAGE:
+40V at V
S
= +5V
±100V at V
S
= ±15V
● DIFFERENTIAL GAIN = 0.1V/V TO 100V/V:
Set with External Resistors
● LOW QUIESCENT CURRENT: 570µA
● WIDE SUPPLY RANGE:
Single Supply: 4.5V to 36V
Dual Supplies: ±2.25V to ±18V
● LOW GAIN ERROR: 0.025%
● HIGH CMR: 80dB
● SO-8 PACKAGE
APPLICATIONS
● CURRENT SHUNT MEASUREMENTS
● SENSOR AMPLIFIER
● SYNCHRONOUS DEMODULATOR
●
CURRENT AND DIFFERENTIAL LINE
RECEIVER
● VOLTAGE-CONTROLLED CURRENT
SOURCE
● BATTERY POWERED SYSTEMS
● LOW COST AUTOMOTIVE
INSTRUMENTATION
R
5
10kΩ
(1%)
A1
V
IN
INA146
V
O
R
2
10kΩ
R
1
100kΩ
V
IN
R
3
100kΩ
R
4
10kΩ
R
G1
R
G2
A2
V
01
RefV–
V+
G = 0.1
+
–
2
5
7
418
6
3
V
O
= (V
IN
– V
IN
) 0.1 (1 + R
G2
/R
G1
)
+–
SBOS109
Verzeichnis
