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參數(shù)資料
| 型號： | LT1677 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, Rail-to-Rail Precision Op Amp(低噪聲，滿幅度輸入和輸出精密運(yùn)算放大器) |
| 中文描述： | 低噪聲，軌至軌精度運(yùn)算放大器（低噪聲，滿幅度輸入和輸出精密運(yùn)算放大器） |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 304K |
| 代理商： | LT1677 |
13
LT1677
APPLICATIOU
W
U
U
Offset Voltage and Drift
Thermocouple effects, caused by temperature gradients
across dissimilar metals at the contacts to the input
terminals, can exceed the inherent drift of the amplifier
unless proper care is exercised. Air currents should be
minimized, package leads should be short, the two input
leads should be close together and maintained at the same
temperature.
The circuit shown to measure offset voltage is also used as
the burn-in configuration for the LT1677, with the supply
voltages increased to
±
20V (Figure 4).
Figure 4. Test Circuit for Offset Voltage and
Offset Voltage Drift with Temperature
1677 F04
V
OUT
V
OUT
=
1000V
OS
*RESISTORS MUST HAVE LOW
THERMOELECTRIC POTENTIAL
7
6
4
2
3
15V
–15V
–
+
LT1677
50k*
100
*
50k*
As with all operational amplifiers when R
F
> 2k, a pole will
be created with R
F
and the amplifier’s input capacitance,
creating additional phase shift and reducing the phase
margin. A small capacitor (20pF to 50pF) in parallel with R
F
will eliminate this problem.
Noise Testing
The 0.1Hz to 10Hz peak-to-peak noise of the LT1677 is
measured in the test circuit shown (Figure 6a). The fre-
quency response of this noise tester (Figure 6b) indicates
that the 0.1Hz corner is defined by only one zero. The test
time to measure 0.1Hz to 10Hz noise should not exceed
ten seconds, as this time limit acts as an additional zero to
eliminate noise contributions from the frequency band
below 0.1Hz.
Measuring the typical 90nV peak-to-peak noise perfor-
mance of the LT1677 requires special test precautions:
1. The device should be warmed up for at least five
minutes. As the op amp warms up, its offset voltage
changes typically 3
μ
V due to its chip temperature
increasing 10
°
C to 20
°
C from the moment the power
supplies are turned on. In the ten-second measurement
interval these temperature-induced effects can easily
exceed tens of nanovolts.
2. For similar reasons, the device must be well shielded
from air currents to eliminate the possibility of
thermoelectric effects in excess of a few nanovolts,
which would invalidate the measurements.
3. Sudden motion in the vicinity of the device can also
“feedthrough” to increase the observed noise.
Current noise is measured in the circuit shown in Figure 7
and calculated by the following formula:
i
e
nV
)(
M
1
n
no
=
(
)
(
)
(
)
2
21 2
130
101
101
The LT1677 achieves its low noise, in part, by operating
the input stage at 100
μ
A versus the typical 10
μ
A of most
other op amps. Voltage noise is inversely proportional
while current noise is directly proportional to the square
Figure 5. Pulsed Operation
1677 F05
LT1677
–
+
R
F
OUTPUT
2.5V/
μ
s
Unity-Gain Buffer Application
When R
F
≤
100
and the input is driven with a fast, large-
signal pulse (>1V), the output waveform will look as
shown in the pulsed operation diagram (Figure 5).
During the fast feedthrough-like portion of the output, the
input protection diodes effectively short the output to the
input and a current, limited only by the output short-circuit
protection, will be drawn by the signal generator. With
R
F
≥
500
, the output is capable of handling the current
requirements (I
L
≤
20mA at 10V) and the amplifier stays
in its active mode and a smooth transition will occur.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1677_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, Rail-to-Rail Precision Op Amp |
| LT1677C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise, Rail-to-Rail Precision Op Amp |
| LT1677CN8 | 功能描述:IC OPAMP R-R I/O SGL LN 8DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LT1677CN8#PBF | 功能描述:IC OPAMP R-R I/O SGL LN 8DIP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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