A single external resistor sets any gain from 1 to
10,000. INA128 provides an industry standard gain
equation; INA129鈥檚 gain equation is compatible with
the AD620.
The INA128/INA129 is laser trimmed for very low
offset voltage (50碌V), drift (0.5碌V/擄C) and high com-
mon-mode rejection (120dB at G
鈮?/div>
100). It operates
with power supplies as low as
鹵2.25V,
and quiescent
current is only 700碌A(chǔ)鈥攊deal for battery operated
systems. Internal input protection can withstand up to
鹵40V
without damage.
The INA128/INA129 is available in 8-pin plastic
DIP, and SO-8 surface-mount packages, specified for
the 鈥?0擄C to +85擄C temperature range. The INA128
is also available in dual configuration, the INA2128.
V+
7
INA128:
G=1+
50k鈩?/div>
R
G
APPLICATIONS
q
BRIDGE AMPLIFIER
q
THERMOCOUPLE AMPLIFIER
q
RTD SENSOR AMPLIFIER
q
MEDICAL INSTRUMENTATION
q
DATA ACQUISITION
V
IN
鈥?/div>
2
INA128, INA129
Over-Voltage
Protection
A
1
40k鈩?/div>
25k鈩?/div>
(1)
40k鈩?/div>
INA129:
G=1+
6
49.4k鈩?/div>
R
G
1
R
G
8
25k鈩?/div>
(1)
A
2
40k鈩?/div>
4
V鈥?/div>
A
3
V
O
5
40k鈩?/div>
+
V
IN
3
Over-Voltage
Protection
Ref
NOTE: (1) INA129: 24.7k鈩?/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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