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INA333AIDGKT Datasheet(PDF) 11 Page - Texas Instruments

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Part # INA333AIDGKT
Description  Micro-Power (50uA), Zer첩-Drift, Rail-to-Rail Out Instrumentation Amplifier
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA333AIDGKT Datasheet(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
SETTING THE GAIN
A
1
A
2
A
3
6
150kW
150kW
150kW
150kW
7
4
3
8
1
2
V
IN-
V
IN+
R
G
V+
V-
INA333
G=1+
100kW
R
G
5
RFIFilter
50kW
50kW
RFIFilter
Load
V =G
(V
´
V
-
)
O
IN+
IN-
0.1 F
m
0.1 F
m
+
-
V
O
R
G
Alsodrawninsimplifiedform:
INA333
Ref
V
O
V
IN-
V
IN+
Ref
RFIFilter
RFIFilter
INA333
www.ti.com ...................................................................................................................................................................................................... SBOS445 – JULY 2008
Figure 32 shows the basic connections required for
Table 1 lists several commonly-used gains and
operation of the INA333. Good layout practice
resistor values. The 100k
Ω term in Equation 1 comes
mandates the use of bypass capacitors placed close
from the sum of the two internal feedback resistors of
to the device pins as shown.
A1 and A2. These on-chip resistors are laser trimmed
to accurate absolute values. The accuracy and
The output of the INA333 is referred to the output
temperature coefficient of these resistors are included
reference
(REF)
terminal,
which
is
normally
in the gain accuracy and drift specifications of the
grounded. This connection must be low-impedance to
INA333.
assure good common-mode rejection. Although 15
or less of stray resistance can be tolerated while
The stability and temperature drift of the external gain
maintaining specified CMRR, small stray resistances
setting resistor, RG, also affects gain. The contribution
of tens of ohms in series with the REF pin can cause
of RG to gain accuracy and drift can be directly
noticeable degradation in CMRR.
inferred from the gain Equation 1. Low resistor values
required for high gain can make wiring resistance
important. Sockets add to the wiring resistance and
contribute additional gain error (possibly an unstable
Gain of the INA333 is set by a single external
gain error) in gains of approximately 100 or greater.
resistor, RG, connected between pins 1 and 8. The
To ensure stability, avoid parasitic capacitance of
value of RG is selected according to Equation 1:
more than a few picofarads at the RG connections.
Careful matching of any parasitics on both RG pins
G = 1 + (100k
Ω/RG)
(1)
maintains optimal CMRR over frequency.
Figure 32. Basic Connections
Copyright © 2008, Texas Instruments Incorporated
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11
Product Folder Link(s): INA333


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