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| 型号： | MAX4278EUK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC BUFFER CLOSE LOOP SOT23-5 |
| 标准包装： | 2,500 |
| 放大器类型： | 缓冲器 |
| 电路数： | 1 |
| 转换速率： | 1600 V/µs |
| -3db带宽： | 310MHz |
| 电流 - 输入偏压： | 1µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 8mA |
| 电流 - 输出 / 通道： | 100mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
MAX4178/MAX4278
330MHz, Gain of +1/Gain of +2
Closed-Loop Buffers
8
______________________________________________________________________________________
Applications Information
Grounding, Bypassing,
and PC Board Layout
In order to obtain the MAX4178/MAX4278s’ full 330MHz/
310MHz bandwidths, microstrip and stripline tech-
niques are recommended in most cases. To ensure
that the PC board does not degrade the amplifier’s per-
formance, it’s a good idea to design the board for a fre-
quency greater than 1GHz. Even with very short traces,
it’s good practice to use these techniques at critical
points, such as inputs and outputs. Whether you use a
constant-impedance board or not, observe the follow-
ing guidelines when designing the board:
Do not use wire-wrap boards. They are too inductive.
Do not use IC sockets. They increase parasitic capaci-
tance and inductance.
In general, surface-mount components have shorter
leads and lower parasitic reactance, giving better
high-frequency performance than through-hole com-
ponents.
The PC board should have at least two layers, with
one side a signal layer and the other a ground plane.
Keep signal lines as short and straight as possible.
Do not make 90° turns; round all corners.
The ground plane should be as free from voids as
possible.
On Maxim’s evaluation kit, the ground plane has been
removed from areas where keeping the trace capaci-
tance to a minimum is more important than maintaining
ground continuity.
Driving Capacitive Loads
The MAX4178/MAX4278 provide maximum AC perfor-
mance with no output load capacitance. This is the
case when the MAX4178/MAX4278 are driving a cor-
rectly terminated transmission line (e.g., a back-termi-
nated 75
cable). However, the MAX4178/MAX4278
are capable of driving capacitive loads up to 100pF
without oscillations, but with reduced AC performance.
Driving large capacitive loads increases the chance of
oscillations in most amplifier circuits. This is especially
true for circuits with high loop gains, such as voltage
followers. The amplifier’s output resistance and the load
capacitor combine to add a pole and excess phase to
the loop response. If the frequency of this pole is low
enough and if phase margin is degraded sufficiently,
oscillations may occur.
A second problem when driving capacitive loads
results from the amplifier’s output impedance, which
looks inductive at high frequency. This inductance
forms an L-C resonant circuit with the capacitive load,
which causes peaking in the frequency response and
degrades the amplifier’s gain margin.
The MAX4178/MAX4278 drive capacitive loads up to
100pF without oscillation. However, some peaking (in
the frequency domain) or ringing (in the time domain)
may occur. This is shown in Figures 2a and 2b and the
in the Small- and Large-Signal Pulse Response graphs
in the Typical Operating Characteristics.
To drive larger-capacitance loads or to reduce ringing,
add an isolation resistor between the amplifier’s output
and the load, as shown in Figure 1.
The value of RISO depends on the circuit’s gain and the
capacitive load. Figures 3a and 3b show the Bode
plots that result when a 20
isolation resistor is used
with a voltage follower driving a range of capacitive
loads. At the higher capacitor values, the bandwidth is
dominated by the RC network, formed by RISO and CL;
the bandwidth of the amplifier itself is much higher.
Note that adding an isolation resistor degrades gain
accuracy. The load and isolation resistor form a divider
that decreases the voltage delivered to the load.
MAX4178
MAX4278
VIN
RISO
VOUT
CL
RL
Figure 1. Capacitive-Load Driving Circuit
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相关代理商/技术参数 |
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| MAX4278EVKIT-SO | 功能描述:KIT EVALUATION FOR MAX4178,4278 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| MAX427C/D | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP 22V DICE - Gel-pak, waffle pack, wafer, diced wafer on film |
| MAX427C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX427CPA | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX427CPA+ | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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