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INA321E/2K5 Datasheet(PDF) 10 Page - Texas Instruments

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No. de pieza INA321E/2K5
Descripción Electrónicos  microPower, Single-Supply, CMOS Instrumentation Amplifier
PDF  18 Pages
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

INA321E/2K5 Datasheet(HTML) 10 Page - Texas Instruments

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INA321
INA2321
SBOS168B − DECEMBER 2000 − REVISED JULY 2004
www.ti.com
10
APPLICATIONS INFORMATION
The INA321 is a modified version of the classic two op amp
instrumentation amplifier, with an additional gain amplifier.
Figure 1 shows the basic connections for the operation of
the INA321 and INA2321. The power supply should be
capacitively decoupled with 0.1
µF capacitors as close to
the INA321 as possible for noisy or high-impedance
applications.
The output is referred to the reference terminal, which
must be at least 1.2V below the positive supply rail.
OPERATING VOLTAGE
The INA321 family is fully specified and guaranteed over
a supply range of +2.7V to +5.5V, with key parameters
guaranteed over the temperature range of −55
°C to
+125
°C. Parameters that vary significantly with operating
conditions, such as load conditions or temperature, are
shown in the Typical Characteristics.
The INA321 may be operated on a single supply. Figure 2
shows a bridge amplifier circuit operated from a single +5V
supply. The bridge provides a small differential voltage
riding on an input common-mode voltage.
160k
Ω
40k
Ω
40k
Ω
160k
Ω
3
2
5
1
7
8
4
Also drawn in simplified form:
6
REF
0.1
µF0.1µF
RG
V
IN−
V
IN+
V
−
V+
A1
A3
A2
V
O =((VIN+) − (VIN − )) • G
Short V
OUT to RG
for G = 5
5
10
50
100
SHORT
100k
Ω
90k
Ω
190k
Ω
OPEN
100k
Ω
10k
Ω
10k
Ω
R
2
R
1
Shutdown
(For Single
Supply)
DESIRED GAIN
(V/V)
R
1
R
2
G = 5+ 5(R
2 /R1 )
INA321
5
3
2
V
OUT
8
7
6
4
1
V+
Shutdown
RG
V
IN−
V
−
V
IN+
REF
Figure 1. Basic Connections
Bridge
Sensor
+5V
NOTE: (1) REF should be adjusted for the desired output level,
keeping in mind that the value of REF affects the common−mode
input range. See Typical Characteristics.
INA321
5
3
2
V
OUT
8
7
6
4
1
V+
Shutdown
RG
V
IN−
V
−
V
IN+
REF(1)
Figure 2. Bridge Amplifier of the INA321



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