參數(shù)資料
型號(hào)： AD712KRZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP BIFET DUAL PREC 8SOIC
標(biāo)準(zhǔn)包裝： 2,500
放大器類型： J-FET
電路數(shù)： 2
轉(zhuǎn)換速率： 20 V/µs
-3db帶寬： 4MHz
電流 - 輸入偏壓： 20pA
電壓 - 輸入偏移： 200µV
電流 - 電源： 5mA
電流 - 輸出 / 通道： 25mA
電壓 - 電源，單路/雙路(±)： 9 V ~ 36 V，±4.5 V ~ 20 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
AD712
Rev. H | Page 17 of 20
FILTERS
ACTIVE FILTER APPLICATIONS
In active filter applications using op amps, the dc accuracy of
the amplifier is critical to optimal filter performance. The
amplifier offset voltage and bias current contribute to output
error. Offset voltage is passed by the filter and can be amplified
to produce excessive output offset. For low frequency applications
requiring large value input resistors, bias currents flowing
through these resistors also generate an offset voltage.
In addition, at higher frequencies, the op amp dynamics must
be carefully considered. Here, slew rate, bandwidth, and open-
loop gain play a major role in op amp selection. The slew rate
must be fast as well as symmetrical to minimize distortion. The
amplifier bandwidth in conjunction with the filter gain dictates
the frequency response of the filter.
The use of a high performance amplifier such as the AD712
minimizes both dc and ac errors in all active filter applications.
SECOND-ORDER LOW-PASS FILTER
Figure 48 depicts the AD712 configured as a second-order,
Butterworth low-pass filter. With the values as shown, the
corner frequency is 20 kHz; however, the wide bandwidth of the
AD712 permits a corner frequency as high as several hundred
kilohertz. Equations for component selection are as follows:
R1 = R2 = A user selected value (10 kΩ to 100 kΩ, typical)
C1 (in farads) = ()
()()1
2
414
.
1
R
f
cutoff
π
()
()()1
2
707
.
0
2
R
f
C
cutoff
π
=
+15V
1/2
AD712
0.1F
–15V
VOUT
VIN
C1
560pF
R2
20k
R1
20k
C2
280pF
+
–
0
08
23-
0
48
Figure 48. Second-Order Low-Pass Filter
An important property of filters is their out-of-band rejection.
The simple 20 kHz low-pass filter shown in Figure 48, can be
used to condition a signal contaminated with clock pulses or
sampling glitches that have considerable energy content at high
frequencies.
The low output impedance and high bandwidth of the AD712
minimize high frequency feedthrough as shown in Figure 49.
The upper trace is that of another low cost BiFET op amp
showing 17 dB more feedthrough at 5 MHz.
REF 20.0 dBm
10dB/DIV
RANGE 15.0dBm
OFFSET .0 Hz
0dB
CENTER 5 000 000.0Hz
RBW 30kHz
SPAN 10 000 000.0Hz
ST .8 SEC
VBW 30kHz
TYPICAL BIFET
AD712
00
82
3-
0
49
Figure 49. High Frequency Feedthrough
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD712KRZ-REEL7 功能描述:IC OPAMP BIFET DUAL PREC 8SOIC 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
AD712SCHIPS 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Precision, Low Cost, High Speed, BiFET Op Amp
AD712SH 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Operational Amplifier
AD712SH/883B 制造商:Analog Devices 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述:
AD712SQ 制造商:AD 制造商全稱:Analog Devices 功能描述:Dual Precision, Low Cost, High Speed, BiFET Op Amp
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