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參數(shù)資料
| 型號(hào)： | AD8027ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 14/25頁(yè) |
| 文件大小： | 0K |
| 描述： | IC OPAMP R-R LDIST LN LP 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 放大器類(lèi)型： | 電壓反饋 |
| 電路數(shù)： | 1 |
| 輸出類(lèi)型： | 滿(mǎn)擺幅 |
| 轉(zhuǎn)換速率： | 100 V/µs |
| -3db帶寬： | 190MHz |
| 電流 - 輸入偏壓： | 4µA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 6.5mA |
| 電流 - 輸出 / 通道： | 120mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 12 V，±1.35 V ~ 6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)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： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 769 (CN2011-ZH PDF) |
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AD8027/AD8028
Rev. C | Page 20 of 24
PCB Layout
As with all high speed op amps, achieving optimum perform-
ance from the AD8027/AD8028 requires careful attention to
PCB layout. Particular care must be exercised to minimize lead
lengths of the bypass capacitors. Excess lead inductance can
influence the frequency response and even cause high
frequency oscillations. The use of a multilayer board with an
internal ground plane can reduce ground noise and enable a
tighter layout.
To achieve the shortest possible lead length at the inverting
input, the feedback resistor, RF, should be located beneath the
board and span the distance from the output, Pin 6, to the
input, Pin 2. The return node of the resistor, RG, should be
situated as closely as possible to the return node of the negative
supply bypass capacitor connected to Pin 4.
On multilayer boards, all layers underneath the op amp should
be cleared of metal to avoid creating parasitic capacitive
elements. This is especially true at the summing junction
(the input). Extra capacitance at the summing junction can
cause increased peaking in the frequency response and lower
phase margin.
Grounding
To minimize parasitic inductances and ground loops in high
speed, densely populated boards, a ground plane layer is critical.
Understanding where the current flows in a circuit is critical in
the implementation of high speed circuit design. The length of
the current path is directly proportional to the magnitude of the
parasitic inductances and, therefore, the high frequency
impedance of the path. Fast current changes in an inductive
ground return can create unwanted noise and ringing.
The length of the high frequency bypass capacitor pads and
traces is critical. A parasitic inductance in the bypass grounding
works against the low impedance created by the bypass
capacitor. Because load currents flow from supplies as well as
ground, the load should be placed at the same physical location
as the bypass capacitor ground. For large values of capacitors,
which are intended to be effective at lower frequencies, the
current return path length is less critical.
Power-Supply Bypassing
Power-supply pins are actually inputs, and care must be taken to
provide a clean, low noise, dc voltage source to these inputs.
The bypass capacitors have two functions:
Provide a low impedance path for unwanted frequencies
from the supply inputs to ground, thereby reducing the
effect of noise on the supply lines.
Provide sufficient localized charge storage, for fast switching
conditions and minimizing the voltage drop at the supply
pins and the output of the amplifier. This is usually accom-
plished with larger electrolytic capacitors.
Decoupling methods are designed to minimize the bypassing
impedance at all frequencies. This can be accomplished with a
combination of capacitors in parallel to ground.
Good-quality ceramic chip capacitors should be used and
always kept as close as possible to the amplifier package . A
parallel combination of a 0.01 μF ceramic and a 10 μF electro-
lytic covers a wide range of rejection for unwanted noise. The
10 μF capacitor is less critical for high frequency bypassing, and,
in most cases, one per supply line is sufficient.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8027ARZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
| AD8027ARZ-REEL | 功能描述:IC OPAMP R-R LDIST LN LP 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):1 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)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) |
| AD8027ARZ-REEL7 | 功能描述:IC OPAMP R-R LDIST LN LP 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類(lèi)型:電壓反饋 電路數(shù):4 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)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:帶卷 (TR) |
| AD8028 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers |
| AD8028AR | 制造商:Rochester Electronics LLC 功能描述:HIGH PERFORMANCE RRIO - Bulk 制造商:Analog Devices 功能描述:AMP LOW DISTORTION RRI/O SMD 8028 |
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