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參數(shù)資料
| 型號： | INA118P |
| 元件分類： | 測量放大器 |
| 英文描述： | Precision, Low Power INSTRUMENTATION AMPLIFIER |
| 中文描述： | 精密低功耗儀表放大器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 242K |
| 代理商： | INA118P |
10
INA118
V
D
/2
V
D
/2
V
CM
10
μ
A
V
B
10
μ
A
A
2
A
1
C
1
C
2
60k
60k
60k
60k
A
3
V
O
Ref
R
2
25k
R
1
25k
R
G
(External)
Q
2
Q
1
V
IN
V
IN
A
1
Out = V
CM
– V
BE
– (10
μ
A 25k
) – V
O
/2
A
Out = V
– V
– (10
μ
A 25k
) + V
/2
Output Swing Range A
, A
; (V+) – 0.65V to (V–) + 0.06V
Amplifier Linear Input Range: (V+) – 0.65V to (V–) + 0.98V
–
V
O
= G (V
IN
– V
IN
)
+
–
+
Input Bias Current
Compensation
Output Swing Range:
(V+) – 0.8V to (V–) + 0.35V
SINGLE SUPPLY OPERATION
The INA118 can be used on single power supplies of +2.7V
to +36V. Figure 5 shows a basic single supply circuit. The
output Ref terminal is connected to ground. Zero differential
input voltage will demand an output voltage of 0V (ground).
Actual output voltage swing is limited to approximately
35mV above ground, when the load is referred to ground as
shown. The typical performance curve “Output Voltage vs
Output Current” shows how the output voltage swing varies
with output current.
With single supply operation, V
IN
and V
IN
must both be
0.98V above ground for linear operation. You cannot, for
instance, connect the inverting input to ground and measure
a voltage connected to the non-inverting input.
To illustrate the issues affecting low voltage operation,
consider the circuit in Figure 5. It shows the INA118,
operating from a single 3V supply. A resistor in series with
the low side of the bridge assures that the bridge output
voltage is within the common-mode range of the amplifier’s
inputs. Refer to the typical performance curve “Input Com-
mon-Mode Range vs Output Voltage” for 3V single supply
operation.
INPUT PROTECTION
The inputs of the INA118 are individually protected for
voltages up to
±
40V. For example, a condition of –40V on
one input and +40V on the other input will not cause
damage. Internal circuitry on each input provides low series
impedance under normal signal conditions. To provide
equivalent protection, series input resistors would contribute
excessive noise. If the input is overloaded, the protection
circuitry limits the input current to a safe value of approxi-
mately 1.5 to 5mA. The typical performance curve “Input
Bias Current vs Input Overload Voltage” shows this input
current limit behavior. The inputs are protected even if the
power supplies are disconnected or turned off.
FIGURE 4. INA118 Simplified Circuit Diagram.
INSIDE THE INA118
Figure 1 shows a simplified representation of the INA118.
The more detailed diagram shown here provides addi-
tional insight into its operation.
Each input is protected by two FET transistors that
provide a low series resistance under normal signal con-
ditions, preserving excellent noise performance. When
excessive voltage is applied, these transistors limit input
current to approximately 1.5 to 5mA.
The differential input voltage is buffered by Q
1
and Q
2
and impressed across R
G
, causing a signal current to flow
through R
G
, R
1
and R
2
. The output difference amp, A
3
,
removes the common-mode component of the input sig-
nal and refers the output signal to the Ref terminal.
Equations in the figure describe the output voltages of A
1
and A
2
. The V
BE
and IR drop across R
1
and R
2
produce
output voltages on A
1
and A
2
that are approximately 1V
lower than the input voltages.
+
–
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| INA118PB | RES,THKF,68.0,1.0%,100PPM,0.125W |
| INA118U | Precision, Low Power INSTRUMENTATION AMPLIFIER |
| INA121PA | CAP, 220UF @ 50V |
| INA121 | Precision Gain of 5 Instrumentation Amplifier |
| INA121P | Precision Gain of 5 Instrumentation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| INA118P | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION DIP8 118 |
| INA118P | 制造商:Texas Instruments 功能描述:AMP INSTRUMENTATION 800KHZ PDIP8 制造商:Texas Instruments 功能描述:AMP, INSTRUMENTATION, 800KHZ, PDIP8 制造商:Texas Instruments 功能描述:AMP, INSTRUMENTATION, 800KHZ, PDIP8; No. of Amplifiers:1; Input Offset Voltage:125V; Bandwidth:800kHz; Supply Voltage Range: 1.35V to 18V; Amplifier Case Style:DIP; No. of Pins:8; Amplifier Output:Single Ended; CMRR:125dB; Slew ;RoHS Compliant: Yes |
| INA118PB | 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 |
| INA118PB | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION |
| INA118PB | 制造商:Texas Instruments 功能描述:IC AMP INSTRUMENTATION PDIP8 118 |
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