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參數(shù)資料
| 型號(hào)： | LT1490ACMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Fasteners |
| 中文描述： | DUAL OP-AMP, 1350 uV OFFSET-MAX, 0.2 MHz BAND WIDTH, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 201K |
| 代理商： | LT1490ACMS8 |
8
LT1490A
Supply Voltage
The positive supply pin of the LT1490A should be by-
passed with a small capacitor (about 0.01
μ
F) within an
inch of the pin. When driving heavy loads an additional
4.7
μ
F electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
The LT1490A is protected against reverse battery voltages
up to 18V. In the event a reverse battery condition occurs,
the supply current is less than 1nA.
The LT1490A can be shut down by removing V
+
. In this
condition the input bias current is typically less than 0.5nA,
even if the inputs are 44V above the negative supply.
When operating the LT1490A on total supplies of 20V or
more, the supply must not rise to its final voltage in less
than 1
μ
s. This is especially true if low ESR bypass capaci-
tors are used. A series RLC circuit is formed from the
supply lead inductance and the bypass capacitor. A resis-
tance of 7.5
in the supply or in the bypass capacitor will
dampen the tuned circuit enough to limit the rise time.
Inputs
The LT1490A has two input stages, NPN and PNP (see the
Simplified Schematic), resulting in three distinct operat-
ing regions as shown in the Input Bias Current vs Common
Mode typical performance curve.
For input voltages about 0.8V or more below V
+
, the PNP
input stage is active and the input bias current is typically
–1nA. When the input voltage is about 0.5V or less from
V
+
, the NPN input stage is operating and the input bias
current is typically 25nA. Increases in temperature will
cause the voltage at which operation switches from the
PNP stage to the NPN stage to move towards V
+
. The input
offset voltage of the NPN stage is untrimmed and is
typically 600
μ
V.
A Schottky diode in the collector of each NPN transistor of
the NPN input stage allows the LT1490A to operate with
either or both of its inputs above V
+
. At about 0.3V above
V
+
the NPN input transistor is fully saturated and the input
bias current is typically 3
μ
A at room temperature. The
input offset voltage is typically 700
μ
V when operating
above V
+
. The LT1490A will operate with its inputs 44V
above V
–
regardless of V
+
.
The inputs are protected against excursions as much as
15V below V
–
by an internal 1k resistor in series with
each input and a diode from the input to the negative
supply. There is no output phase reversal for inputs up to
15V below V
–
. There are no clamping diodes between the
inputs and the maximum differential input voltage is 44V.
Output
The output voltage swing of the LT1490A is affected by
input overdrive as shown in the typical performance
curves.
The output of the LT1490A can be pulled up to 18V beyond
V
+
with less than 1nA of leakage current, provided that V
+
is less than 0.5V.
The normally reverse-biased substrate diode from the
output to V
–
will cause unlimited currents to flow when the
output is forced below V
–
. If the current is transient and
limited to 100mA, no damage will occur.
The LT1490A is internally compensated to drive at least
200pF of capacitance under any output loading condi-
tions. A 0.22
μ
F capacitor in series with a 150
resistor
between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 10,000pF, at all
output currents.
Distortion
There are two main contributors of distortion in op amps:
output crossover distortion as the output transitions
from sourcing to sinking current and distortion caused
by nonlinear common mode rejection. Of course, if the op
amp is operating inverting there is no common mode
induced distortion. When the LT1490A switches be-
tween input stages there is significant nonlinearity in the
CMRR. Lower load resistance increases the output cross-
over distortion, but has no effect on the input stage
transition distortion. For lowest distortion the LT1490A
should be operated single supply, with the output always
sourcing current and with the input voltage swing be-
tween ground and (V
+
– 0.8V). See the Typical Perfor-
mance Characteristics curves.
APPLICATIOU
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1490ACMS8#PBF | 功能描述:IC OPAMP DUAL R-R MCRPWR 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:Over-The-Top® 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 |
| LT1490ACMS8#PBF | 制造商:Linear Technology 功能描述:OPERATIONAL AMPLIFIER IC 制造商:Linear Technology 功能描述:IC, OP-AMP, 180KHZ, 0.06V/ us, MSOP-8 |
| LT1490ACMS8#TR | 功能描述:IC OPAMP DUAL R-R MCRPWR 8MSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:Over-The-Top® 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| LT1490ACMS8#TRPBF | 功能描述:IC OPAMP DUAL R-R MCRPWR 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:Over-The-Top® 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 |
| LT1490ACMS8PBF | 制造商:Linear Technology 功能描述:Op Amplifier Dual RRI/O Micropower MSOP8 |
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