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| 型号： | MAX44251EVKIT# |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/14页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT OPAMP AUTOZERO MAX44251 |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 每 IC 通道数： | 2 - 双 |
| 放大器类型： | 自动调零 |
| 输出类型： | 满摆幅 |
| 转换速率： | 8 V/µs |
| 电流 - 输出 / 通道： | 96mA |
| 工作温度： | -40°C ~ 125°C |
| 电流供应（主 IC）： | 1.15mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 20 V，±1.35 V ~ 10 V |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX44251 |
11
Maxim Integrated
MAX44250/MAX44251/MAX44252
20V, Ultra-Precision, Low-Noise Op Amps
ADC Buffer Amplifier
The MAX44250/MAX44251/MAX44252's low input offset
voltage, low noise, and fast settling time make these
amplifiers ideal for ADC buffers. Weigh scales are one
application that often require a low-noise, high-voltage
amplifier in front of an ADC. Figure 1 details an example
of a load cell and amplifier driven from the same Q10V
supplies, along with the MAX11211 18-bit delta sigma
ADC. Load cells produce a very small voltage change at
their outputs, therefore driving the excitation source with
a higher voltage produces a wider dynamic range that
can be measured at the ADC inputs.
The MAX11211 ADC operates from a single 2.7V to 3.6V
analog supply, offers 18-bit noise-free resolution and
0.86mW power dissipation. The MAX11211 also offers
> 100dB rejection at 50Hz and 60Hz. This ADC is part of
a family of 16-, 18-, 20-, and 24-bit delta sigma ADCs with
high precision and < 1mW power dissipation.
The MAX44250/MAX44251/MAX44252's low input offset
voltage and low noise allow a gain circuit prior to the
MAX11211 without losing any dynamic range at the ADC.
Error Budget Example
When using the ICs as an ADC buffer in strain gauge
application, the temperature drift should be taken into
consideration to determine maximum input signal. A
typical strain gauge has sensitivity specification of just
2mV/V at rated out load. This means that when the strain
gauge load cell is powered with 10V, the full-scale output
voltage is 20mV. In this application, both offset voltage
and drift are critical parameters that directly affect the
accuracy of measurement. Even though offset voltage
could be calibrated out, its drift over temperature is still
a problem.
The ICs, with a typical offset drift of 5nV/°C, guarantee
that the drift over a 10°C range is only 50nV. Setting this
equal to 0.5 LSB in a 18-bit system yields a full-scale
range of 13mV. With a single 10V supply, an acceptable
closed-loop gain of 770V/V provides sufficient gain while
maintaining headroom.
Precision Low-Side Current Sensing
The ICs’ autozero feature produces ultra-low offset
voltage and drift, making them ideal for precision cur-
rent-sensing applications. Figure 2 shows the ICs in
a low-side current-sense configuration. This circuit pro-
duces an accurate output voltage, VOUT equal to ILOAD
x RSENSE x (1 + R2/R1).
Figure 2. Low-Side Current Sensing
VSUPPLY
OUT
ILOAD
RSENSE
R1
R2
MAX44251
MAX44252
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX44251EVKIT# | 功能描述:放大器 IC 开发工具 MAX44251 Eval Kit RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX44251EVKIT+ | 功能描述:放大器 IC 开发工具 20V ultra-precision low-noise low-drift amplifiers RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| MAX44252ASD+ | 功能描述:运算放大器 - 运放 20V Ultra-Precision Low-Noise Op Amp 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 |
| MAX44252ASD+T | 功能描述:运算放大器 - 运放 20V Ultra-Precision Low-Noise Op Amp 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 |
| MAX44252EVKIT# | 功能描述:放大器 IC 开发工具 20V Ultra-Precision Low-Noise Op Amp RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
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