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參數(shù)資料
| 型號： | AMP02FS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Precision Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 350 uV OFFSET-MAX, 1.2 MHz BAND WIDTH, PDSO16 |
| 封裝： | MS-013AA, SOIC-16 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 266K |
| 代理商： | AMP02FS |
AMP02
REV. D
–8–
T he voltage gain can range from 1 to 10,000. A gain set resistor
is not required for unity-gain applications. Metal-film or wire-
wound resistors are recommended for best results.
T he total gain accuracy of the AMP02 is determined by the tol-
erance of the external gain set resistor, R
G
, combined with the
gain equation accuracy of the AMP02. T otal gain drift com-
bines 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. T hermocouples formed be-
tween copper and dissimilar metals can easily destroy the
T CV
OS
performance of the AMP02 which is typically
0.5
μ
V/
°
C. Resistors themselves can generate thermoelectric
EMFs when mounted parallel to a thermal gradient.
T he 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.
T he input stage and output buffer are laser-trimmed to increase
gain accuracy. T he AMP02 maintains wide bandwidth at all
gains as shown in Figure 26. For voltage gains greater than 10,
the bandwidth is over 200 kHz. At unity-gain, the bandwidth of
the AMP02 exceeds 1 MHz.
Figure 26. The AMP02 Keeps Its Bandwidth at
High Gains
COMMON-MODE RE JE CT ION
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, ex-
pressed in dB. Laser trimming is used to achieve the high CMR
of the AMP02.
APPLICAT IONS INFORMAT ION
INPUT AND OUT PUT OFFSE T VOLT AGE S
Instrumentation amplifiers have independent offset voltages
associated with the input and output stages. T he input offset
component is directly multiplied by the amplifier gain, whereas
output offset is independent of gain. T herefore, at low gain,
output-offset-errors dominate, while at high gain, input-offset-
errors dominate. Overall offset voltage, V
OS
, referred to the out-
put (RT O) is calculated as follows:
V
OS
(RTO) = (V
IOS
3
G) + V
OOS
where V
IOS
and V
OOS
are the input and output offset voltage
specifications and G is the amplifier gain.
T he overall offset voltage drift T CV
OS
, 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
OS
(RTO) = (TCV
IOS
3
G) + TCV
OOS
where T CV
IOS
is the input offset voltage drift, and T CV
OOS
is
the output offset voltage drift. Frequently, the amplifier drift is
referred back to the input (RT I) which is then equivalent to an
input signal change:
TCV
OS
(RTI) =TCV
IOS
+
TCV
OOS
G
For example, the maximum input-referred drift of an
AMP02EP set to G = 1000 becomes:
TCV
OS
(RTI) = 2
μ
V/
°
C +
100
μ
V
/
°
C
1000
= 2.1
μ
V/
°
C
INPUT BIAS AND OFFSE T CURRE NT S
Input transistor bias currents are additional error sources which
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. T he 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
T he AMP02 only requires a single external resistor to set the
voltage gain. T he voltage gain, G, is:
G
=
50
k
R
G
+
1
and
R
G
=
50
k
G
±1
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| AMP02FSZ | 功能描述:IC AMP INST PREC LDRIFT 16SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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| AMP02GBC | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Accuracy 8-Pin Instrumentation Amplifier |
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