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| 型号： | MAX4321EUK-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP 5MHZ R-TO-R I/O SOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 2 V/µs |
| 增益带宽积： | 5MHz |
| 电流 - 输入偏压： | 50nA |
| 电压 - 输入偏移： | 1200µV |
| 电流 - 电源： | 725µA |
| 电流 - 输出 / 通道： | 50mA |
| 电压 - 电源，单路/双路(±)： | 2.4 V ~ 6.5 V，±1.2 V ~ 3.25 V |
| 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) |
MAX4321
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
_______________________________________________________________________________________
7
__________ Applications Information
Rail-to-Rail Input Stage
The MAX4321 high-speed amplifier has rail-to-rail input
and output stages designed for low-voltage, single-
supply operation. The input stage consists of separate
NPN and PNP differential stages, which combine to
provide an input common-mode range extending to the
supply rails. The PNP stage is active for input voltages
close to the negative rail, and the NPN stage is active
for input voltages near the positive rail. The switchover
transition region, which occurs near VCC / 2, has been
extended to minimize the slight degradation in CMRR
caused by the mismatch of the input pairs. Its low offset
voltage, high bandwidth, and rail-to-rail common-mode
range makes this op amp an excellent choice for preci-
sion, low-voltage, data-acquisition systems.
Since the input stage switches between the NPN and
PNP pairs, the input bias current changes polarity as
the input voltage passes through the transition region.
To reduce the offset error caused by input bias cur-
rents flowing through external source impedances,
match the effective impedance seen by each input
(Figures 1a, 1b). High source impedances, together
with the input capacitance, can create a parasitic pole
that produces an underdamped signal response.
Reducing the input impedance or placing a small (2pF
to 10pF) capacitor across the feedback resistor
improves the response.
The MAX4321’s inputs are protected from large differen-
tial input voltages by 1k
Ω series resistors and back-to-
back triple diodes across the inputs (Figure 2). For
differential input voltages less than 1.8V, the input resis-
tance is typically 500k
Ω. For differential input voltages
greater than 1.8V, the input resistance is approximately
2k
Ω, and the input bias current is determined by the fol-
lowing equation:
I
=
V
- 1.8V
2k
BIAS
DIFF
Ω
R3
R3 = R1
R2
R1
R2
MAX4321
Figure 1a. Reducing Offset Error Due to Bias Current
(Noninverting)
R3
R3 = R1
R2
R1
R2
MAX4321
Figure 1b. Reducing Offset Error Due to Bias Current
(Inverting)
1k
Figure 2. Input Protection Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4322ESA | 功能描述:运算放大器 - 运放 Low-Power Rail-Rail I/O 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 |
| MAX4322ESA+ | 功能描述:运算放大器 - 运放 Low-Power Rail-Rail I/O 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 |
| MAX4322ESA+T | 功能描述:运算放大器 - 运放 Low-Power Rail-Rail I/O 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 |
| MAX4322ESA-T | 功能描述:运算放大器 - 运放 Low-Power Rail-Rail I/O 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 |
| MAX4322EUA | 功能描述:运算放大器 - 运放 Integrated Circuits (ICs) 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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