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參數(shù)資料
| 型號： | INA110BG |
| 元件分類： | 測量放大器 |
| 英文描述： | Fast-Settling FET-Input INSTRUMENTATION AMPLIFIER |
| 中文描述： | 快速建立FET輸入儀表放大器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 148K |
| 代理商： | INA110BG |
INA110
8
GAIN SELECTION
Gain selection is accomplished by connecting the appropri-
ate pins together on the INA110. Table I shows possible
gains from the internal resistors. Keep the connections as
short as possible to maintain accuracy.
Gains other than 1, 10, 100, 200, and 500 can be set by
adding an external resistor, R
G
, between pin 3 and pins 12,
16, and 11. Gain accuracy is a function of R
G
and the
internal resistors which have a
±
20% tolerance with
20ppm/
°
C drift. The equation for choosing R
G
is shown
below.
40k
R
G
= – 50
Gain can also be changed in the output stage by adding
resistance to the feedback loop shown in Figure 4. This is
useful for increasing the total gain or reducing the input
stage gain to prevent saturation of input amplifiers.
The output gain can be changed as shown in Table II.
Matching of R
1
and R
3
is required to maintain high CMR. R
2
sets the gain with no effect on CMR.
CONNECT PIN 3
TO PIN
GAIN
GAIN
GAIN
ACCURACY (%)
DRIFT (ppm/
°
C)
The following gains have guaranteed accuracy:
1
none
10
13
100
12
200
16
500
11
0.02
0.05
0.1
0.2
0.5
10
10
20
30
50
The following gains have typical accuracy as shown:
300
12, 16
600
11, 12
700
11, 16
800
11, 12, 16
0.25
0.25
2
2
10
40
40
80
TABLE I. Internal Gain Connections.
are eliminated since they are inside the feedback loop.
Proper connection is shown in Figure 1. When more current
is to be supplied, a power booster can be placed within the
feedback loop as shown in Figure 5. Buffer errors are
minimized by the loop gain of the output amplifier.
FIGURE 4. Gain Adjustment of Output Stage Using H Pad
Attenuator.
FIGURE 5. Current Boosting the Output.
3553
1
6
10
INA110
9
V
OUT
R
L
V
IN
2
I
L
= 100mA
Sense
G –1
OUTPUT STAGE GAIN
R
1
AND R
3
1.2k
1k
1.5k
R
2
2
5
10
2.74k
511
340
TABLE II. Output Stage Gain Control.
COMMON-MODE INPUT RANGE
It is important not to exceed the input amplifiers’ dynamic
range (see Typical Performance Curves). The differential
input signal and its associated common-mode voltage should
not cause the output of A
1
and A
2
(input amplifiers) to
exceed approximately
±
10V with
±
15V supplies or nonlin-
ear operation will result. Such large common-mode volt-
ages, when the INA110 is in high gain, can cause saturation
of the input stage even though the differential input is very
small. This can be avoided by reducing the input stage gain
and increasing the output stage gain with an H pad attenuator
(see Figure 4).
OUTPUT SENSE
An output sense has been provided to allow greater accuracy
in connecting the load. By attaching this feedback point to
the load at the load site, IR drops due to load currents that
LOW BIAS CURRENT
OF FET INPUT ELIMINATES DC ERRORS
Because the INA110 has FET inputs, bias currents drawn
through input source resistors have a negligible effect on DC
accuracy. The picoamp levels produce no more than micro-
volts through megohm sources. Thus, input filtering and
input series protection are readily achievable.
A return path for the input bias currents must always be
provided to prevent charging of stray capacitance. Other-
wise, the output can wander and saturate. A 1M
to 10M
resistor from the input to common will return floating
sources such as transformers, thermocouples, and
AC-coupled inputs (see Applications section).
DYNAMIC PERFORMANCE
The INA110 is a fast-settling FET input instrumentation
amplifier. Therefore, careful attention to minimize stray
capacitance is necessary to achieve specified performance.
High source resistance will interact with input capacitance to
reduce the overall bandwidth. Also, to maintain stability,
avoid capacitance from the output to the gain set, offset
adjust, and input pins.
Applications with balanced-source impedance will provide
the best performance. In some applications, mismatched
source impedances may be required. If the impedance in the
1
6
10
INA110
9
V
OUT
R
3
V
IN
R
2
2
R
1
Output Stage Gain
(R
2
|| 20k
) + R
1
+ R
3
R
2
|| 20k
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA110BG-BI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Instrumentation Amp， Fixed Gain |
| INA110KP | 功能描述:儀表放大器 Fast-Settling FET-In Very High Accuracy RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| INA110KP | 制造商:BURR-BROWN 功能描述:IC AMP INSTRUMENTATION DIP16 110 |
| INA110KP | 制造商:Texas Instruments 功能描述:Instrumentation Amplifier IC |
| INA110KPG4 | 功能描述:儀表放大器 Fast-Settling FET-In Very High Accuracy RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
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