The INA125 is a low power, high accuracy instrumen-
tation amplifier with a precision voltage reference. It
provides complete bridge excitation and precision dif-
ferential-input amplification on a single integrated
circuit.
A single external resistor sets any gain from 4 to
10,000. The INA125 is laser-trimmed for low offset
voltage (250碌V), low offset drift (2碌V/擄C), and high
common-mode rejection (100dB at G = 100). It oper-
ates on single (+2.7V to +36V) or dual (鹵1.35V to
鹵18V)
supplies.
The voltage reference is externally adjustable with pin-
selectable voltages of 2.5V, 5V, or 10V, allowing use
with a variety of transducers. The reference voltage is
accurate to
鹵0.5%
(max) with
鹵35ppm/擄C
drift (max).
Sleep mode allows shutdown and duty cycle operation
to save power.
The INA125 is available in 16-pin plastic DIP and
SO-16 surface-mount packages and is specified for
the 鈥?0擄C to +85擄C industrial temperature range.
Bandgap
V
REF
+
V
IN
6
9
30k鈩?/div>
R
G
10k鈩?/div>
10k鈩?/div>
+
鈥?/div>
V
O
= (V
IN
鈥?V
IN
) G
8
7
鈥?/div>
V
IN
A
2
30k鈩?/div>
G = 4 + 60k鈩?/div>
R
G
11
Sense
A
1
10
V
O
IA
REF
5
3
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
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