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參數(shù)資料
| 型號(hào)： | OP482 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Quad Low Power, High Speed JFET Operational Amplifiers(低功耗,高速四運(yùn)算放大器) |
| 中文描述： | 四路低功耗，高速場(chǎng)效應(yīng)運(yùn)算放大器（低功耗，高速四運(yùn)算放大器） |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 267K |
| 代理商： | OP482 |
OP282/OP482
REV. B
–5–
T he circuit shown in Figure 3 can be used to accurately
program the “Q,” the cutoff frequency f
C
, and the gain of a two
pole state-variable filter. OP482s have been used in this design
because of their high bandwidths, low power and low noise.
T his circuit takes only three packages to build because of the
quad configuration of the op amps and DACs.
T he DACs shown are all used in the voltage mode so all values
are dependent only on the accuracy of the DAC and not on the
absolute values of the DAC’s resistive ladders. T his make this
circuit unusually accurate for a programmable filter.
Adjusting DAC 1 changes the signal amplitude across R1;
therefore, the DAC attenuation times R1 determines the
amount of signal current that charges the integrating capacitor,
C1. T his cutoff frequency can now be expressed as:
fc
=
1
2
π
R
1
C
1
D
1
256
where D
1
is the digital code for the DAC.
Gain of this circuit is set by adjusting D
3
. T he gain equation is:
Gain
=
R
4
R
5
D
3
256
DAC 2 is used to set the “Q” of the circuit. Adjusting this DAC
controls the amount of feedback from the bandpass node to the
input summing node. Note that the digital value of the DAC is
in the numerator, therefore zero code is not a valid operating point.
Q
=
R
2
R
3
256
D
2
R5
2k
1/4
OP482
-
+
LOW
PASS
R6
2k
R7
2k
BANDPASS
R1
2k
1/4
OP482
-
+
V
IN
1/4
DAC8408
R4
2k
1/4
DAC8408
1/4
OP482
-
+
1/4
OP482
-
+
HIGH PASS
1/4
DAC8408
-
+
1/4
OP482
R1
2k
1/4
DAC8408
1/4
OP482
-
+
1/4
OP482
-
+
R2
1k
R3
2k
1/4
OP482
-
+
C1
1000pF
C1
1000pF
Figure 3.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP4820017SR | 制造商:Analog Devices 功能描述: |
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| OP482ACBZ-R7 | 功能描述:IC OPAMP JFET 4MHZ QUAD 14WLCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| OP482ACBZ-RL | 功能描述:IC OPAMP JFET 4MHZ QUAD 14WLCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:73 系列:Over-The-Top® 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.07 V/µs 增益帶寬積:200kHz -3db帶寬:- 電流 - 輸入偏壓:1nA 電壓 - 輸入偏移:285µV 電流 - 電源:50µA 電流 - 輸出 / 通道:25mA 電壓 - 電源，單路/雙路(±):2 V ~ 44 V，±1 V ~ 22 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-DFN-EP（5x3） 包裝:管件 |
| OP482ARC/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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