tion amplifier offering excellent accuracy. Its versatile
three-op amp design and very small size make it ideal
for a variety of general purpose applications. Low bias
current (鹵4pA) allows use with high impedance
sources.
Gain can be set from 1V to 10,000V/V with a single
external resistor. Internal input protection can with-
stand up to
鹵40V
without damage.
The INA121 is laser-trimmed for very low offset
voltage (鹵200碌V), low offset drift (鹵2碌V/擄C), and
high common-mode rejection (106dB at G = 100). It
operates on power supplies as low as
鹵2.25V
(+4.5V),
allowing use in battery operated and single 5V sys-
tems. Quiescent current is only 450碌A(chǔ).
Package options include 8-pin plastic DIP and SO-8
surface mount. All are specified for the 鈥?0擄C to
+85擄C industrial temperature range.
APPLICATIONS
q
LOW-LEVEL TRANSDUCER AMPLIFIERS
Bridge, RTD, Thermocouple
q
PHYSIOLOGICAL AMPLIFIERS
ECG, EEG, EMG, Respiratory
q
HIGH IMPEDANCE TRANSDUCERS
q
CAPACITIVE SENSORS
q
MULTI-CHANNEL DATA ACQUISITION
q
PORTABLE, BATTERY OPERATED SYSTEMS
q
GENERAL PURPOSE INSTRUMENTATION
V+
7
INA121
V
IN
鈥?/div>
2
Over-Voltage
Protection
A
1
40k鈩?/div>
25k鈩?/div>
40k鈩?/div>
G=1+
1
50k鈩?/div>
R
G
R
G
8
25k鈩?/div>
A
2
40k鈩?/div>
A
3
6
V
O
5
40k鈩?/div>
V
IN
+
3
Over-Voltage
Protection
Ref
4
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
12
