原创 AD627: 微功耗，单电源/双电源，轨到轨仪表放大器

    AD627:  微功耗，单电源/双电源，轨到轨仪表放大器。    

    AD627是一款完整的微功耗仪表放大器，提供轨到轨输出摆幅，采用单电源或双电源（+2.2 V至±18 V）供电。AD627提供出色的交流与直流性能，工作时的最大功耗仅为85 μA。

    AD627具有出色的灵活性，仅需一个外部电阻即可设置增益。AD627采用8引脚的工业标准引脚排列配置。不使用外部电阻时，AD627的增益为5；使用外部电阻时，可设置高达1000的增益。

    AD627具有宽电源电压范围（+2.2 V至±18 V）和微功耗特性，非常适合各种应用。单电源供电、低功耗，以及轨到轨输出摆幅等特性使它成为电池供电应用的理想选择。当采用低电源电压供电时，器件的轨到轨输出级能使动态范围最大。双电源供电（±15 V）与低功耗特性使AD627成为工业应用的理想选择，包括4至20 mA的环路供电系统。

    与其它微功耗仪表放大器不同，AD627的性能并没有受到影响。AD627可提供低失调电压、低失调漂移、低增益误差，以及低增益漂移，从而能将系统误差减到最小。通过在整个频率范围内提供出色的CMRR性能，AD627还能将整个频率范围内的误差减到最小。这款器件在高达200 Hz时仍能保持高CMRR，从而抑制了线路噪声与谐波。

    与微功耗分立设计方案相比，AD627可以提供更出色的性能，占用更小的电路板面积，并具有更低的成本。

    应用

4至20 mA环路供电应用
低功耗医疗设备—ECG, EEG
传感器接口
热电偶放大器
工业过程控制
低功耗数据采集
便携式电池供电仪器仪表
   特征

微功耗，最大电源电流：85 μA
宽电源电压范围：+2.2 V 至±18 V
易于使用
仅需一个外部电阻即可设置增益
增益范围：5(无外部电阻)至1000
性能优于分立设计方案
轨到轨输出摆幅
高精度直流性能
增益精度：0.03%(典型值) (G = +5) (AD627A)
增益漂移：10 ppm/°C(典型值) (G = +5)
最大输入失调电压：125 μV (AD627B双电源)
最大输入失调电压：200 μV (AD627A 双电源)
最大输入失调电压漂移：1 μV/°C (AD627B)
最大输入失调电压漂移：3 μV/°C (AD627A)

折合到输入端（RTI）噪声：38 nV/√Hz @ 1 kHz (G = +100)
出色的交流性能
AD627A最小CMRR：77 dB (G = +5)
AD627B:最小CMRR：83 dB (G = +5)
带宽：80 kHz (G = +5)
建立时间：135 μs至0.01% (G = +5, 步进5 V) 
 

The AD627 is an integrated, micropower instrumentation amplifier that delivers rail-to-rail output swing on single and dual (+2.2 V to ±18 V) supplies. The AD627 provides excellent ac and dc specifications while operating at only 85 μA maximum.

The AD627 offers superior flexibility by allowing the user to set the gain of the device with a single external resistor while con-forming to the 8-lead industry-standard pinout configuration. With no external resistor, the AD627 is configured for a gain of 5. With an external resistor, it can be set to a gain of up to 1000.

A wide supply voltage range (+2.2 V to ±18 V) and micropower current consumption make the AD627 a perfect fit for a wide range of applications. Single-supply operation, low power consumption, and rail-to-rail output swing make the AD627 ideal for battery-powered applications. Its rail-to-rail output stage maximizes dynamic range when operating from low supply voltages. Dual-supply operation (±15 V) and low power consumption make the AD627 ideal for industrial applications, including 4 to 20 mA loop-powered systems.

The AD627 does not compromise performance, unlike other micropower instrumentation amplifiers. Low voltage offset, offset drift, gain error, and gain drift minimize errors in the system. The AD627 also minimizes errors over frequency by providing excellent CMRR over frequency. Because the CMRR remains high up to 200 Hz, line noise and line harmonics are rejected.

The AD627 provides superior performance, uses less circuit board area, and costs less than micropower discrete designs.

Applications

4 to 20 mA loop-powered applications
Low power medical instrumentation—ECG, EEG
Transducer interfacing
Thermocouple amplifiers
Industrial process controls
Low power data acquisition
Portable battery-powered instruments
 
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Micropower, 85 μA maximum supply current
Wide power supply range (+2.2 V to ±18 V)
Easy to use
Gain set with one external resistor
Gain range 5 (no resistor) to 1000
Higher performance than discrete designs
Rail-to-rail output swing
High accuracy dc performance
0.03% typical gain accuracy (G = +5) (AD627A)
10 ppm/°C typical gain drift (G = +5)
125 μV maximum input offset voltage (AD627B dual supply)
200 μV maximum input offset voltage (AD627A dual supply)
1 μV/°C maximum input offset voltage drift (AD627B)
3 μV/°C maximum input offset voltage drift (AD627A)

Noise: 38 nV/√Hz RTI noise @ 1 kHz (G = +100)
Excellent ac specifications
AD627A: 77 dB minimum CMRR (G = +5)
AD627B: 83 dB minimum CMRR (G = +5)
80 kHz bandwidth (G = +5)
135 μs settling time to 0.01% (G = +5, 5 V step)