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参数资料
| 型号： | AD8655ARZ-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | Low Noise, Precision CMOS Amplifier |
| 中文描述： | OP-AMP, 550 uV OFFSET-MAX, 28 MHz BAND WIDTH, PDSO8 |
| 封装： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件页数： | 18/20页 |
| 文件大小： | 273K |
| 代理商： | AD8655ARZ-REEL7 |
AD8655/AD8656
LAYOUT, GROUNDING, AND BYPASSING CONSIDERATIONS
POWER SUPPLY BYPASSING
Power supply pins can act as inputs for noise, so care must be
taken to apply a noise-free, stable dc voltage. The purpose of
bypass capacitors is to create low impedances from the supply
to ground at all frequencies, thereby shunting or filtering most
of the noise. Bypassing schemes are designed to minimize the
supply impedance at all frequencies with a parallel combination
of capacitors with values of 0.1 μF and 4.7 μF. Chip capacitors
of 0.1 μF (X7R or NPO) are critical and should be as close as
possible to the amplifier package. The 4.7 μF tantalum capacitor
is less critical for high frequency bypassing, and, in most cases,
only one is needed per board at the supply inputs.
Rev. A | Page 18 of 20
GROUNDING
A ground plane layer is important for densely packed PC
boards to minimize parasitic inductances. This minimizes
voltage drops with changes in current. However, an under-
standing of where the current flows in a circuit is critical to
implementing effective high speed circuit design. The length
of the current path is directly proportional to the magnitude
of parasitic inductances, and, therefore, the high frequency
impedance of the path. Large changes in currents in an
inductive ground return create unwanted voltage noise.
The length of the high frequency bypass capacitor leads is
critical, and, therefore, surface-mount capacitors are recom-
mended. A parasitic inductance in the bypass ground trace
works against the low impedance created by the bypass
capacitor. Because load currents flow from the supplies, the
ground for the load impedance should be at the same physical
location as the bypass capacitor grounds. For larger value
capacitors intended to be effective at lower frequencies, the
current return path distance is less critical.
LEAKAGE CURRENTS
Poor PC board layout, contaminants, and the board insulator
material can create leakage currents that are much larger than
the input bias current of the AD8655/AD8656. Any voltage
differential between the inputs and nearby traces creates leakage
currents through the PC board insulator, for example, 1 V/100
GΩ = 10 pA. Similarly, any contaminants on the board can
create significant leakage (skin oils are a common problem).
To significantly reduce leakage, put a guard ring (shield) around
the inputs and input leads that are driven to the same voltage
potential as the inputs. This ensures there is no voltage potential
between the inputs and the surrounding area to create any
leakage currents. To be effective, the guard ring must be driven
by a relatively low impedance source and should completely
surround the input leads on all sides, above and below, by using
a multilayer board.
The charge absorption of the insulator material itself can also
cause leakage currents. Minimizing the amount of material
between the input leads and the guard ring helps to reduce the
absorption. Also, using low absorption materials, such as
Teflon or ceramic, may be necessary in some instances.
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| AD8656ARZ-REEL | Low Noise, Precision CMOS Amplifier |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8655WARMZ-RL | 功能描述:General Purpose Amplifier 1 Circuit Rail-to-Rail 8-MSOP 制造商:analog devices inc. 系列:DigiTrim? 包装:带卷（TR） 零件状态:有效 放大器类型:通用 电路数:1 输出类型:满摆幅 压摆率:11 V/μs 增益带宽积:28MHz -3db 带宽:- 电流 - 输入偏置:1pA 电压 - 输入失调:50μV 电流 - 电源:3.7mA 电流 - 输出/通道:220mA 电压 - 电源，单/双（±）:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:3,000 |
| AD8656 | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Noise, Precision CMOS Amplifier |
| AD8656ARMZ | 功能描述:IC OPAMP GP R-R CMOS 28MHZ 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:DigiTrim® 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| AD8656ARMZ | 制造商:Analog Devices 功能描述:IC OP-AMP 28MHZ 11V/ MSOP-8 |
| AD8656ARMZ-R2 | 制造商:Analog Devices 功能描述:OP Amp Dual Volt Fdbk R-R I/O 5.5V 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC |
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