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INA106KP Datasheet(PDF) 6 Page - Texas Instruments

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Part # INA106KP
Description  Precision Gain = 10 DIFFERENTIAL AMPLIFIER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

INA106KP Datasheet(HTML) 6 Page - Texas Instruments

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INA106
6
SBOS152A
www.ti.com
To make a high performance high gain instrumentation amplifier, the INA106
can be combined with state-of-the-art op amps. For low source impedance
applications, OPA37s will give the best noise, offset, and temperature drift. At
source impedances above about 10k
Ω, the bias current noise of the OPA37
reacting with input impedance degrades noise. For these applications, use an
OPA111 or a dual OPA2111 FET input op amp for lower noise. For an
electrometer grade IA, use the OPA128—see table below.
Using the INA106 for the difference amplifier also extends the input common-
mode range of the instrumentation amplifier to
±10V. A conventional IA with
a unity-gain difference amplifier has an input common-mode range limited to
±5V for an output swing of ±10V. This is because a unity-gain difference amp
needs
±5V at the input for 10V at the output, allowing only 5V additional for
common-mode.
R1
R2
GAIN
CMRR
NOISE AT 1kHz
A1, A2
(
Ω)(kΩ) (V/V)
(dB)
Ib (pA)
(nV/
Hz)
OPA37A
50.5
2.5
1000
128
40000
4
OPA111B
202
10
1000
110
1
10
OPA128LM
202
10
1000
118
0.075
38
FIGURE 8. Precision G = 11 Buffer.
FIGURE 3. Difference Amplifier with Gain and CMR Adjust.
FIGURE 4. Precision G = –10 Inverting Amplifier.
This circuit follows an 11/1 divider with a gain of 11 for an overall gain of unity.
With an 11/1 divider, the input signal can exceed 100V without damage.
FIGURE 5. Voltage Follower with Input Protection.
FIGURE 6. Precision Instrumentation Amplifier.
FIGURE 7. Precision Summing Amplifier.
10
10
10k
100k
10k
100k
200
200
V
1
V
2
2
3
5
1
6
E
0
Gain
Adjust
CMR
Adjust
INA106
To eliminate adjustment interactions,
first adjust gain with V
2 grounded.
25
6
INA106
V
O
3
R
3
10k
V
O = VIN
V
IN
R
1
10k
R
4
100k
1
R
2
100k
±100V
Safe Input
E
1
–In
2
3
5
1
6
INA106
E
0 = 10(1 + 2R2 /R1) (E2 – E1)
A
2
A
1
E
2
+In
R
1
R
2
E
0
Output
R
2
25
6
INA106
V
0
V
1
R
1
10k
R
4
100k
1
R
2
100k
R
3
10k
3
V
3
V
0 = V1 + 10 V3
5
6
INA106
V
O = 11VIN
1
2
V
IN
3
V
O
Gain Error =
0.01% maximum
100k
10k
100k
10k
V
2
25
6
INA106
V
O
3
V
O = –10V2
1
Gain Error = 0.01% maximum
Nonlinearity = 0.001% maximum
Gain Drift = 2.ppm/°C
10k
100k
10k
100k


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