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| 型號： | AMP02EP |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST PREC LDRIFT 8DIP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 6 V/µs |
| -3db帶寬： | 1.2MHz |
| 電流 - 輸入偏壓： | 2nA |
| 電壓 - 輸入偏移： | 20µV |
| 電流 - 電源： | 5mA |
| 電流 - 輸出 / 通道： | 32mA |
| 電壓 - 電源，單路/雙路(±)： | ±4.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 管件 |
REV. E
–8–
AMP02
The voltage gain can range from 1 to 10,000. A gain set resistor is
not required for unity-gain applications. Metal-film or wirewound
resistors are recommended for best results.
The total gain accuracy of the AMP02 is determined by the
tolerance of the external gain set resistor, RG, combined with the
gain equation accuracy of the AMP02. Total gain drift combines
the mismatch of the external gain set resistor drift with that of the
internal resistors (20 ppm/
°C typ). Maximum gain drift of the
AMP02 independent of the external gain set resistor is 50 ppm/
°C.
All instrumentation amplifiers require attention to layout so
thermocouple effects are minimized. Thermocouples formed
between copper and dissimilar metals can easily destroy the
TCVOS performance of the AMP02, which is typically 0.5
V/°C.
Resistors themselves can generate thermoelectric EMFs when
mounted parallel to a thermal gradient.
The AMP02 uses the triple op amp instrumentation amplifier
configuration with the input stage consisting of two transimped-
ance amplifiers followed by a unity-gain differential amplifier.
The input stage and output buffer are laser-trimmed to increase
gain accuracy. The AMP02 maintains wide bandwidth at all
gains as shown in Figure 3. For voltage gains greater than 10,
the bandwidth is over 200 kHz. At unity gain, the bandwidth of
the AMP02 exceeds 1 MHz.
FREQUENCY – Hz
VO
LTA
GE
GAIN
–
dB
80
1k
100k
1M
10M
40
0
–20
–40
TA = 25 C
VS = 15V
10k
60
20
G = 1
G = 10
G = 100
G = 1000
Figure 3. The AMP02 Keeps Its Bandwidth at
High Gains
Common-Mode Rejection
Ideally, an instrumentation amplifier responds only to the differ-
ence between the two input signals and rejects common-mode
voltages and noise. In practice, there is a small change in output
voltage when both inputs experience the same common-mode
voltage change; the ratio of these voltages is called the
common-mode gain. Common-mode rejection (CMR) is the
logarithm of the ratio of differential-mode gain to common-mode
gain, expressed in dB. Laser trimming is used to achieve the
high CMR of the AMP02.
APPLICATIONS INFORMATION
Input and Output Offset Voltages
Instrumentation amplifiers have independent offset voltages
associated with the input and output stages. The input offset
component is directly multiplied by the amplifier gain, whereas
output offset is independent of gain. Therefore at low gain,
output-offset errors dominate while at high gain, input-offset
errors dominate. Overall offset voltage, VOS, referred to the
output (RTO) is calculated as follows:
V
RTO
V
G
V
OS
IOS
OOS
() =×
() +
where VIOS and VOOS are the input and output offset voltage
specifications and G is the amplifier gain.
The overall offset voltage drift TCVOS, referred to the output, is
a combination of input and output drift specifications. Input
offset voltage drift is multiplied by the amplifier gain, G, and
summed with the output offset drift:
TCV
RTO
TCV
G
TCV
OS
IOS
OOS
() =×
() +
where TCVIOS is the input offset voltage drift, and TCVOOS is
the output offset voltage drift. Frequently, the amplifier drift is
referred back to the input (RTI), which is then equivalent to an
input signal change:
TCV
RTI
TCV
G
OS
IOS
OOS
() =+
For example, the maximum input-referred drift of an
AMP02EP set to G = 1000 becomes:
TCV
RTI
V
C
VC
OS
() =+
=
2
100
1000
21
o
.
Input Bias and Offset Currents
Input transistor bias currents are additional error sources that
can degrade the input signal. Bias currents flowing through the
signal source resistance appear as an additional offset voltage.
Equal source resistance on both inputs of an IA will minimize
offset changes due to bias current variations with signal voltage
and temperature; however, the difference between the two bias
currents (the input offset current) produces an error. The mag-
nitude of the error is the offset current times the source resistance.
A current path must always be provided between the differential
inputs and analog ground to ensure correct amplifier operation.
Floating inputs such as thermocouples should be grounded
close to the signal source for best common-mode rejection.
Gain
The AMP02 only requires a single external resistor to set the
voltage gain. The voltage gain, G, is:
G
=
50 k
RG
+1
and
RG =
50 k
G –1
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