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參數(shù)資料
| 型號： | INA122UA |
| 元件分類： | 測量放大器 |
| 英文描述： | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| 中文描述： | 微功耗，單電源，儀表放大器的CMOS |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 223K |
| 代理商： | INA122UA |
7
INA122
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA122. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins.
The output is referred to the output reference (Ref) terminal
which is normally grounded. This must be a low-impedance
connection to ensure good common-mode rejection. A resis-
tance of 10
in series with the Ref pin will cause a typical
device to degrade to approximately 80dB CMR.
SETTING THE GAIN
Gain of the INA122 is set by connecting a single external
resistor, R
G
, as shown:
200
(1)
Commonly used gains and R
G
resistor values are shown in
Figure 1.
The 200k
term in equation 1 comes from the internal metal
film resistors which are laser trimmed to accurate absolute
values. The accuracy and temperature coefficient of these
resistors are included in the gain accuracy and drift specifi-
cations of the INA122.
The stability and temperature drift of the external gain
setting resistor, R
G
, also affects gain. R
G
’s contribution to
gain accuracy and drift can be directly inferred from the gain
equation (1).
OFFSET TRIMMING
The INA122 is laser trimmed for low offset voltage and
offset voltage drift. Most applications require no external
offset adjustment. Figure 2 shows an optional circuit for
trimming the output offset voltage. The voltage applied to
the Ref terminal is added to the output signal. An op amp
buffer is used to provide low impedance at the Ref terminal
to preserve good common-mode rejection.
G
k
R
G
=
+
5
FIGURE 1. Basic Connections.
100k
25k
25k
100k
INA122
5
4
2
3
6
5
8
1
2
1
8
3
7
6
R
G
R
G
V
IN
A
2
A
1
–
V
IN
+
V
IN
–
V
IN
+
V+
V–
INA122
0.22μF
0.1μF
V
O
V
O
Ref
Ref
Load
+
–
Also drawn in simplified form:
V
O
= (V
IN
– V
IN
) G
–
+
200k
R
G
G = 5 +
Dual Supply
Single Supply
DESIRED GAIN
(V/V)
R
G
(
)
NEAREST 1%
R
G
VALUE
NC
40.2k
13.3k
4420
2100
1020
402
200
100
40.2
20
5
NC
40k
13.33k
4444
2105
1026
404
201
100.3
40
20
10
20
50
100
200
500
1000
2000
5000
10000
NC: No Connection.
INPUT BIAS CURRENT RETURN PATH
The input impedance of the INA122 is extremely high—
approximately 10
10
. However, a path must be provided for
the input bias current of both inputs. This input bias current
is approximately –10nA (current flows out of the input
terminals). High input impedance means that this input bias
current changes very little with varying input voltage.
FIGURE 2. Optional Trimming of Output Offset Voltage.
10k
OPA336
±10mV
Adjustment Range
100
100
100μA
1/2 REF200
100μA
1/2 REF200
V+
V–
R
G
INA122
Ref
V
O
V
IN
–
V
IN
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA122UA | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION SOIC8 122 |
| INA122UA | 制造商:Texas Instruments 功能描述:AMP INSTRUMENTATION 120KHZ SMD 制造商:Texas Instruments 功能描述:AMP, INSTRUMENTATION, 120KHZ, SMD |
| INA122UA/2K5 | 功能描述:儀表放大器 Single Supply MicroPower 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 |
| INA122UA/2K5G4 | 功能描述:儀表放大器 Single Supply MicroPower 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 |
| INA122UAG4 | 功能描述:儀表放大器 Single Supply MicroPower 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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