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參數(shù)資料
| 型號(hào)： | INA110AG |
| 元件分類(lèi)： | 測(cè)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(yè)數(shù)： | 7/11頁(yè) |
| 文件大?。?/td> | 148K |
| 代理商： | INA110AG |
INA110
7
DISCUSSION OF
PERFORMANCE
A simplified diagram of the INA110 is shown on the first
page. The design consists of the classical three operational
amplifier configuration using current-feedback type op amps
with precision FET buffers on the input. The result is an
instrumentation amplifier with premium performance not
normally found in integrated circuits.
The input section (A
1
and A
2
) incorporates high perfor-
mance, low bias current, and low drift amplifier circuitry.
The amplifiers are connected in the noninverting configura-
tion to provide high input impedance (10
12
). Laser-trim-
ming is used to achieve low offset voltage. Input cascoding
assures low bias current and high CMR. Thin-film resistors
on the integrated circuit provide excellent gain accuracy and
temperature stability.
The output section (A
3
) is connected in a unity-gain differ-
ence amplifier configuration. Precision matching of the four
10
k
resistors, especially over temperature and time,
assures high common-mode rejection.
BASIC POWER SUPPLY
AND SIGNAL CONNECTIONS
Figure 1 shows the proper connections for power supply and
signal. Supplies should be decoupled with 1
μ
F tantalum
capacitors as close to the amplifier as possible. To avoid
gain and CMR errors introduced by the external circuit,
connect grounds as indicated, being sure to minimize ground
resistance. Resistance in series with the reference (pin 6)
will degrade CMR. To maintain stability, avoid capacitance
from the output to the gain set, offset adjust, and input pins.
INA110’s input (RTI) is the offset of the input stage plus
the offset of the output stage divided by the gain of the
input stage. This allows specification of offset independent
of gain.
FIGURE 2. Offset Adjustment Circuit.
1
2
6
10
INA110
9
V
OUT
100k
4
–V
CC
5
14
15
100k
+V
CC
Input
Offset
Adjust
Output
Offset
Adjust
V
IN
For systems using computer autozeroing techniques, neither
offset nor offset drift are of concern. In many other applica-
tions, the factory-trimmed offset gives excellent results.
When greater accuracy is desired, one adjustment is usually
sufficient. In high gains (>100) adjust only the input offset,
and in low gains the output offset. For higher precision in all
gains, both can be adjusted by first selecting high gain and
adjusting input offset and then low gain and adjusting output
offset. The offset adjustment will, however, add to the drift
by approximately 0.33
μ
V/
°
C per 100
μ
V of input offset
voltage that is adjusted. Therefore, care should be taken
when considering use of adjustment.
Output offsetting can be accomplished as shown in Figure 3
by applying a voltage to the reference (pin 6) through a
buffer. This limits the resistance in series with pin 6 to
minimize CMR error. Be certain to keep this resistance low.
Note that the offset error can be adjusted at this reference
point with no appreciable degradation in offset drift.
FIGURE 3. Output Offsetting.
1
6
10
INA110
9
V
OUT
R
3
OPA177
V
IN
V
OUT
= V
OFFSETTING
+
V
IN
G.
R
2
R
1
+V
CC
–V
CC
V
OFFSETTING
V
OFFSETTING
With ±V
CC
= 15V, R
1
= 100k
, R
2
= 1M
.
R
3
= 10k
, V
OFFSETTING
= ±150mV
.
2
OFFSET ADJUSTMENT
Figure 2 shows the offset adjustment circuit for the INA110.
Both the offset of the input stage and output stage can be
adjusted separately. Notice that the offset referred to the
FIGURE 1. Basic Circuit Connection.
1
13
12
16
11
3
2
8
6
10
9
V
OUT
V
IN
x10
x100
x200
x500
7
1μF
R
L
–V
CC
1μF
+V
CC
Sense
V
OUT
=
V
IN
G
INA110
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| INA110BG | Fast-Settling FET-Input INSTRUMENTATION AMPLIFIER |
| INA110KP | Fast-Settling FET-Input INSTRUMENTATION AMPLIFIER |
| INA110SG | Fast-Settling FET-Input INSTRUMENTATION AMPLIFIER |
| INA110KU | Fast-Settling FET-Input INSTRUMENTATION AMPLIFIER |
| INA111 | Very High Accuracy Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA110AG-BI | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Instrumentation Amp， Fixed Gain |
| INA110BG | 制造商:BB 制造商全稱(chēng):BB 功能描述:Fast-Settling FET-Input INSTRUMENTATION AMPLIFIER |
| INA110BG-BI | 制造商:未知廠家 制造商全稱(chēng):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 |
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