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參數資料
| 型號： | AD8044AR-14-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | VARISTOR 14VRMS 14MM RADIAL |
| 中文描述： | OP-AMP, 9000 uV OFFSET-MAX, 15 MHz BAND WIDTH, PDSO14 |
| 封裝： | PLASTIC, SOIC-14 |
| 文件頁數： | 13/14頁 |
| 文件大小： | 199K |
| 代理商： | AD8044AR-14-REEL |
AD8044
REV. A
–13–
Active Filters
Active filters at higher frequencies require wider bandwidth op
amps to work effectively. Excessive phase shift produced by
lower frequency op amps can significantly impact active filter
performance.
Figure 38 shows an example of a 2 MHz biquad bandwidth
filter that uses three op amps of an AD8044 package. Such
circuits are sometimes used in medical ultrasound systems to
lower the noise bandwidth of the analog signal before A/D
conversion.
2
3
1
R1
3k
V
V
IN
R2
2k
V
C1
50pF
R3
2k
V
6
5
7
R6
1k
V
R5
2k
V
9
10
8
AD8044
AD8044
AD8044
C2
50pF
V
OUT
R4
2k
V
Figure 38. 2 MHz Biquad Bandpass Filter Using AD8044
The frequency response of the circuit is shown in Figure 39.
FREQUENCY – Hz
0
–10
10k
100M
100k
G
1M
10M
–20
–30
–40
Figure 39. Frequency Response of 2 MHz Bandpass
Biquad Filter
Layout Considerations
The specified high speed performance of the AD8044 requires
careful attention to board layout and component selection.
Proper RF design techniques and low-pass parasitic component
selection are necessary.
The PCB should have a ground plane covering all unused por-
tions of the component side of the board to provide a low im-
pedance path. The ground plane should be removed from the
area near the input pins to reduce the stray capacitance.
Chip capacitors should be used for the supply bypassing. One
end should be connected to the ground plane and the other
within 1/8 inch of each power pin. An additional large (0.47
μ
F
– 10
μ
F) tantalum electrolytic capacitor should be connected in
parallel, but not necessarily so close, to supply current for fast,
large signal changes at the output.
The feedback resistor should be located close to the inverting
input pin in order to keep the stray capacitance at this node to a
minimum. Capacitance variations of less than 1 pF at the in-
verting input will significantly affect high speed performance.
Stripline design techniques should be used for long signal traces
(greater than about 1 inch). These should be designed with a
characteristic impedance of 50
or 75
and be properly termi-
nated at each end.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8044AR-14-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Quad Volt Fdbk R-R O/P ±6V/12V 14-Pin SOIC N T/R |
| AD8044AR-EBZ | 功能描述:BOARD EVAL FOR AD8044AR RoHS:是 類別:編程器，開發系統 >> 評估板 - 運算放大器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- |
| AD8044ARZ-14 | 功能描述:IC OPAMP VF R-R QUAD LP 14SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:4 輸出類型:- 轉換速率: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） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8044ARZ-14 | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
| AD8044ARZ-14-REEL | 功能描述:IC OPAMP VF R-R QUAD LP 14SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:J-FET 電路數:2 輸出類型:- 轉換速率:13 V/µs 增益帶寬積:3MHz -3db帶寬:- 電流 - 輸入偏壓:65pA 電壓 - 輸入偏移:3000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
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