参数资料
| 型号： | MAX4244ESD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP BTR 14-SOIC |
| 标准包装： | 2,500 |
| 系列： | Beyond-the-Rails™ |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.04 V/µs |
| 增益带宽积： | 90kHz |
| 电流 - 输入偏压： | 2nA |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 14µA |
| 电流 - 输出 / 通道： | 2.5mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.5 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) |
Single/Dual/Quad, +1.8V/10A, SOT23,
Beyond-the-Rails Op Amps
MAX4240–MAX424
4
_______________Detailed Description
Beyond-the-Rails Input Stage
The MAX4240–MAX4244 have Beyond-the-Rails inputs
and rail-to-rail output stages that are specifically
designed for low-voltage, single-supply operation. The
input stage consists of separate NPN and PNP differen-
tial stages, which operate together to provide a com-
mon-mode range extending to 200mV beyond both
supply rails. The crossover region of these two pairs
occurs halfway between VCC and VEE. The input offset
voltage is typically 200V. Low operating supply voltage,
low supply current, beyond-the-rails common-mode
input range, and rail-to-rail outputs make this family of
operational amplifiers an excellent choice for precision or
general-purpose, low-voltage battery-powered systems.
Since the input stage consists of NPN and PNP pairs,
the input bias current changes polarity as the common-
mode voltage passes through the crossover region.
Match the effective impedance seen by each input to
reduce the offset error caused by input bias currents
flowing through external source impedances (Figures
1a and 1b). The combination of high source impedance
plus input capacitance (amplifier input capacitance
plus stray capacitance) creates a parasitic pole that
produces an underdamped signal response. Reducing
input capacitance or placing a small capacitor across
the feedback resistor improves response in this case.
The MAX4240–MAX4244 family’s inputs are protected
from large differential input voltages by internal 2.2k
Ω
series resistors and back-to-back triple-diode stacks
across the inputs (Figure 2). For differential input volt-
ages (much less than 1.8V), input resistance is typically
45M
Ω. For differential input voltages greater than 1.8V,
input resistance is around 4.4k
Ω, and the input bias
current can be approximated by the following equation:
IBIAS = (VDIFF - 1.8V) / 4.4kΩ
R3
VIN
R3 = R1
R2
R1
R2
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
R3
R3 = R1
R2
R1
R2
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
VIN
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
2.2k
IN-
IN+
Figure 2. Input Protection Circuit
10
______________________________________________________________________________________
Ω
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4245AUT | 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL RAIL-TO-RAIL I/O WITH - Rail/Tube |
| MAX4245AUT+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R I/O 2.75V/5.5V 6PIN SOT-23 - Rail/Tube |
| MAX4245AUT+T | 功能描述:运算放大器 - 运放 Rail-Rail I/O w/Disable 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 |
| MAX4245AUT-T | 功能描述:运算放大器 - 运放 Rail-Rail I/O w/Disable 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 |
| MAX4245AXT | 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL RAIL-TO-RAIL I/O WITH - Rail/Tube |
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