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參數(shù)資料
| 型號： | INA2128 |
| 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)： | 8/10頁 |
| 文件大?。?/td> | 282K |
| 代理商： | INA2128 |
INA2128
8
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA2128. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins as shown.
The output is referred to the output reference (Ref) terminals
(Ref
A
and Ref
B
) which are normally grounded. These must
be low-impedance connections to assure good common-
mode rejection. A resistance of 8
in series with a Ref pin
will cause a typical device to degrade to approximately
80dB CMR (G = 1).
The INA2128 has a separate output sense feedback connec-
tions Sense
A
and Sense
B
. These must be connected to their
respective output terminals for proper operation. The output
sense connection can be used to sense the output voltage
directly at the load for best accuracy.
SETTING THE GAIN
Gain of the INA2128 is set by connecting a single external
resistor, R
G
, connected as shown:
Commonly used gains and resistor values are shown in
Figure 1.
The 50k
term in equation 1 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 accurate absolute
values. The accuracy and temperature coefficient of these
resistors are included in the gain accuracy and drift specifi-
cations of the INA2128.
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 in
gains of approximately 100 or greater.
DYNAMIC PERFORMANCE
The typical performance curve “Gain vs Frequency” shows
that despite its low quiescent current, the INA2128 achieves
wide bandwidth, even at high gain. This is due to its current-
feedback topology. Settling time also remains excellent at
high gain—see “Settling Time vs Gain.”
NOISE PERFORMANCE
The INA2128 provides very low noise in most applications.
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
+
50k
R
G
(1)
FIGURE 1. Basic Connections.
DESIRED
GAIN
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
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.
A
1
A
2
A
3
6
(11)
7
(10)
Sense
(12)
(13)
(14)
(16)
(15)
40k
40k
40k
40k
9
8
2
4
3
1
Pin numbers for
Channel B shown
in parenthesis.
V
IN
V
IN
R
G
V+
V–
INA2128
G = 1 +50k
R
G
–
+
5
Over-Voltage
Protection
25k
25k
Over-Voltage
Protection
Load
V
O
= G (V
IN
– V
IN
)
+
–
0.1μF
0.1μF
NOTE: If channel is unused,
connect inputs to ground, sense
to V
O
, and leave Ref open-circuit.
+
–
V
O
R
G
Also drawn in simplified form:
INA2128
Ref
V
O
V
IN
–
V
IN
+
Ref
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA21281K | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, Low Power INSTRUMENTATION AMPLIFIER |
| INA21281KE4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, Low Power INSTRUMENTATION AMPLIFIER |
| INA21281KG4 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, Low Power INSTRUMENTATION AMPLIFIER |
| INA2128P | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| INA2128PA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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