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參數(shù)資料
| 型號： | INA121PA |
| 元件分類： | 運算放大器 |
| 英文描述： | CAP, 220UF @ 50V |
| 中文描述： | FET輸入，低功耗儀表放大器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 220K |
| 代理商： | INA121PA |
8
INA121
APPLICATION INFORMATION
Figure 1 shows the basic connections required for operation
of the INA121. 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) 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 of the INA121 is set by connecting a single external
resistor, R
G
, connected between pins 1 and 8:
Commonly used gains and resistor values are shown in
Figure 1.
(1)
G
=
1
+
50k
R
G
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 INA121.
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 INA121 achieves
wide bandwidth, even at high gain. This is due to the
current-feedback topology of the INA121. Settling time also
remains excellent at high gain.
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–
INA121
G = 1 +50k
R
G
–
+
5
Ref
Over-Voltage
Protection
25k
25k
Over-Voltage
Protection
Load
V
O
= G (V
IN
– V
IN
)
+
–
0.1μF
0.1μF
+
–
V
O
R
G
Also drawn in simplified form:
INA121
Ref
V
O
V
IN
–
V
IN
+
DESIRED
GAIN
R
G
(
)
NEAREST 1% R
G
(
)
1
2
5
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
10
20
50
100
200
500
1000
2000
5000
10000
NC: No Connection.
FIGURE 1. Basic Connections.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA121PA | 制造商:BURR-BROWN 功能描述:IC AMP INSTRUMENTATION DIP8 121 制造商:Texas Instruments 功能描述:Instrumentation Amplifier IC |
| INA121PA | 制造商:Texas Instruments 功能描述:IC INST AMP FET 600KHZ DIP8 制造商:Texas Instruments 功能描述:IC, INST AMP, FET, 600KHZ, DIP8 制造商:Texas Instruments 功能描述:IC, INST AMP, FET, 600KHZ, DIP8; No. of Amplifiers:1; Input Offset Voltage:1mV; Bandwidth:600kHz; Supply Voltage Range: 2.25V to 18V; Amplifier Case Style:DIP; No. of Pins:8; Amplifier Output:Single Ended; CMRR:106dB; Slew ;RoHS Compliant: Yes |
| INA121PAG4 | 功能描述:儀表放大器 FET-Input 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 |
| INA121PG4 | 功能描述:儀表放大器 FET-Input 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 |
| INA121U | 功能描述:儀表放大器 FET-Input 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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