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| 型号： | MAX4309 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | 400MHz, Ultra-Low-Distortion Op Amps(400MHz,高速,超低失真双电源/射频运放) |
| 中文描述： | 400MHz、超低失真运算放大器 |
| 文件页数： | 9/12页 |
| 文件大小： | 162K |
| 代理商： | MAX4309 |
M
400MHz, Ultra-Low-Distortion Op Amps
_______________________________________________________________________________________
9
The MAX4108/MAX4109 are ultra-low-distortion, high-
bandwidth op amps. The output distortion will be
degraded as the total load resistance seen by the ampli-
fier decreases. To minimize distortion products, keep the
input and gain-setting resistors relatively large. A 500
feedback resistor combined with an appropriate input
resistor to set the gain will provide excellent AC perfor-
mance without significantly increasing distortion.
Driving Capac itive Loads
The MAX4108/MAX4109 are optimized for AC perfor-
mance. They are not designed to drive highly reactive
loads. Reactive loads will decrease phase margin and
may produce excessive ringing and oscillation. Figure
1a shows a circuit that eliminates this problem, and
Figure 1b is a graph of the optimal isolation resistor
(R
S
) vs. capacitive load. Figures 2a and 2b show how a
capacitive load causes excessive peaking of the ampli-
fier’s bandwidth if the capacitive load is not isolated
(R
S
) from the amplifier. A small isolation resistor (usual-
ly 10
to 20
) placed before the reactive load prevents
ringing and oscillation. At higher capacitive loads, AC
performance will be controlled by the interaction of the
load capacitance and isolation resistor. Figures 3a and
3b show the effect of an isolation resistor on the
MAX4108/MAX4109 closed-loop response.
Coaxial cable and other transmission lines are easily
driven when terminated at both ends with their charac-
teristic impedance. When driving back-terminated
transmission lines, the capacitance of the transmission
line is essentially eliminated.
MAX4108
MAX4109
R
F
R
G
30
R
S
C
L
V
IN
PART
MAX4108
MAX4109
RF (
)
120
270
GAIN (V/V)
+1
+2
R
L
Figure 1a. Using an Isolation Resistor for High Capacitive
Loads
0
M
I
)
20
25
15
10
5
190
10
40
70
100 130
CAPACITANCE (pF)
160
220
MAX4109
MAX4108
Figure 1b. Optimal Isolation Resistor (RS) vs. Capacitive Load
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4309ESA | 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 |
| MAX4309ESA+ | 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 |
| MAX4309ESA+T | 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 |
| MAX4309ESA-T | 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 |
| MAX430CPA | 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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