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參數(shù)資料
| 型號(hào)： | INA128P |
| 元件分類： | 測(cè)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)： | 8/10頁 |
| 文件大?。?/td> | 245K |
| 代理商： | INA128P |
A
1
A
2
A
3
6
40k
40k
40k
40k
7
4
3
8
1
2
V
IN
V
IN
R
G
V+
V–
INA128, INA129
–
+
5
Ref
Over-Voltage
Protection
25k
(1)
25k
(1)
Over-Voltage
Protection
Load
V
O
= G (V
IN
– V
IN
)
+
–
0.1μF
0.1μF
+
–
V
O
R
G
Also drawn in simplified form:
INA128
Ref
V
O
V
IN
–
V
IN
+
NOTE: (1) INA129: 24.7k
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA128/INA129. Applications with noisy or high
impedance power supplies may require decoupling capaci-
tors close to the device pins as shown.
The output is referred to the output reference (Ref) terminal
which is normally grounded. This must be a low-impedance
connection to assure good common-mode rejection. A resis-
tance of 8
in series with the Ref pin will cause a typical
device to degrade to approximately 80dB CMR (G = 1).
SETTING THE GAIN
Gain is set by connecting a single external resistor, R
G
,
connected between pins 1 and 8:
INA129:
(2)
Commonly used gains and resistor values are shown in
Figure 1.
The 50k
term in Equation 1 (49.4k
in Equation 2) comes
from the sum of the two internal feedback resistors of A
1
and
A
2
. These on-chip metal film resistors are laser trimmed to
INA128:
(1)
G
=
1
+
50k
R
G
FIGURE 1. Basic Connections.
accurate absolute values. The accuracy and temperature
coefficient of these internal resistors are included in the gain
accuracy and drift specifications of the INA128/INA129.
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). Low resistor values required for high gain can
make wiring resistance important. Sockets add to the wiring
resistance which will contribute additional gain error (possi-
bly an unstable gain error) in gains of approximately 100 or
greater.
DYNAMIC PERFORMANCE
The typical performance curve “Gain vs Frequency” shows
that, despite its low quiescent current, the INA128/INA129
achieves wide bandwidth, even at high gain. This is due to
the current-feedback topology of the input stage circuitry.
Settling time also remains excellent at high gain.
NOISE PERFORMANCE
The INA128/INA129 provides very low noise in most appli-
cations. Low frequency noise is approximately 0.2
μ
Vp-p
measured from 0.1 to 10Hz (G
≥
100). This provides
dramatically improved noise when compared to state-of-the-
art chopper-stabilized amplifiers.
G
=1+49
.
4
k
R
G
DESIRED
GAIN (V/V)
R
G
(
)
NEAREST
1% R
G
(
)
R
G
(
)
NEAREST
1% R
G
(
)
1
2
5
10
20
50
100
200
500
1000
2000
5000
10000
NC
NC
49.9k
12.4k
5.62k
2.61k
1.02k
511
249
100
49.9
24.9
10
4.99
NC
49.4k
12.35k
5489
2600
1008
499
248
99
49.5
24.7
9.88
4.94
NC
49.9k
12.4k
5.49k
2.61k
1k
499
249
100
49.9
24.9
9.76
4.87
50.00k
12.50k
5.556k
2.632k
1.02k
505.1
251.3
100.2
50.05
25.01
10.00
5.001
NC: No Connection.
INA128
INA129
50k
R
G
INA128:
G = 1 +
INA129:
G = 1 +4R
G
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| INA128PA | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| INA128U | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| INA129UA | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| INA129P | microPower, Single-Supply, CMOS Instrumentation Amplifier |
| INA129PA | microPower, Single-Supply, CMOS Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA128P | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION |
| INA128P | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION PDIP8 128 |
| INA128PA | 功能描述:儀表放大器 Precision Low Power Instrumentation Amp 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 |
| INA128PA | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION PDIP8 128 |
| INA128PAG4 | 功能描述:儀表放大器 Precision Low Power Instrumentation Amp 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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