参数资料
| 型号： | AD8007ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/21页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP CF ULDIST LN LP 8SOIC |
| 标准包装： | 98 |
| 放大器类型： | 电流反馈 |
| 电路数： | 1 |
| 转换速率： | 1000 V/µs |
| -3db带宽： | 650MHz |
| 电流 - 输入偏压： | 4µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 9mA |
| 电流 - 输出 / 通道： | 130mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 12 V，±2.5 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 769 (CN2011-ZH PDF) |
AD8007/AD8008
Rev. E | Page 17 of
20
LAYOUT AND GROUNDING CONSIDERATIONS
GROUNDING
A ground plane layer is important in densely packed printed
circuit boards (PCB) to minimize parasitic inductances. However,
an understanding 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 thus the high frequency impedance of
the path. High speed currents in an inductive ground return
create unwanted voltage noise. Broad ground plane areas reduce
parasitic inductance.
INPUT CAPACITANCE
Along with bypassing and ground, high speed amplifiers can be
sensitive to parasitic capacitance between the inputs and ground.
Even 1 pF or 2 pF of capacitance reduces the input impedance at
high frequencies, in turn increasing the gain of the amplifier, which
causes peaking of the frequency response or even oscillations if
severe enough. Place the external passive components that are
connected to the input pins as close as possible to the inputs to
avoid parasitic capacitance. The ground and power planes must
be kept at a distance of at least 0.05 mm from the input pins on
all layers of the board.
OUTPUT CAPACITANCE
To a lesser extent, parasitic capacitances on the output can cause
peaking of the frequency response. The following two methods
minimize its effect:
Put a small value resistor in series with the output to isolate
the load capacitance from the output stage of the amplifier
(see Figure 12).
Increase the phase margin by increasing the gain of the
amplifier or by increasing the value of the feedback resistor.
INPUT-TO-OUTPUT COUPLING
To minimize capacitive coupling, the input and output signal
traces should not be parallel. When they are not parallel, they
help reduce unwanted positive feedback.
EXTERNAL COMPONENTS AND STABILITY
The AD8007/AD8008 are current feedback amplifiers and, to a
first order, the feedback resistor determines the bandwidth and
stability. The gain, load impedance, supply voltage, and input
impedances also have an effect.
peaking for a gain of 2. Increasing RF reduces peaking but also
the gain also reduces peaking and bandwidth. Table 4 shows the
recommended RF and RG values that optimize bandwidth with
minimal peaking.
Table 4. Recommended Component Values
Gain
RF (Ω)
RG (Ω)
RS (Ω)
1
499
200
+1
499
Not applicable
200
+2
499
200
+5
499
124
200
+10
499
54.9
200
The load resistor also affects bandwidth, as shown in Figure 7 and
demonstrates the effect of gain and supply voltage.
When driving loads with a capacitive component, stability
improves by using a series snub resistor, RSNUB, at the output.
The frequency and pulse responses for various capacitive
For noninverting configurations, a resistor in series with the
input, RS, is needed to optimize stability for a gain of 1, as
illustrated in Figure 8. For larger noninverting gains, the effect
of a series resistor is reduced.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8007ARZ | 制造商:Analog Devices 功能描述:CURRENT FEEDBACK AMP 650MHZ 8SOIC |
| AD8007ARZ1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultralow Distortion,High Speed Amplifiers |
| AD8007ARZR7 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultralow Distortion,High Speed Amplifiers |
| AD8007ARZ-R7 | 功能描述:IC OPAMP CF ULDIST LN LP 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| AD8007ARZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Ultralow Distortion,High Speed Amplifiers |
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