AD8227ARZ - Wide Supply Range In-Amp | Analog Devices
料号： AD8227ARZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
AD8227ARZ 概述
An instrumentation amplifier (in-amp) is a type of differential amplifier that amplifies the difference between two input signals while rejecting common-mode voltages. It is a key building block in precision measurement systems, where it conditions small sensor signals before analog-to-digital conversion. In-amps are characterized by high input impedance, high common-mode rejection ratio (CMRR), and low offset voltage, making them ideal for bridge sensors, thermocouples, and other low-level signal sources.
Key features of the AD8227ARZ include a gain range of 5 to 1000 set by a single external resistor, a wide supply range of ±2.25 V to ±18 V (or 4.5 V to 36 V single supply), and a rail-to-rail output stage. It offers a 3 dB bandwidth of 250 kHz at G = 5, a slew rate of 1.2 V/µs, and an input bias current of 27 nA. The device also features low offset voltage and drift, ensuring accurate signal conditioning over temperature.
The AD8227 uses a classic three-op-amp architecture with a precision laser-trimmed resistor network, providing excellent CMRR and gain accuracy. The rail-to-rail output allows maximum dynamic range in single-supply applications, while the wide supply range accommodates both 5 V and ±15 V systems. The SOIC-8 package is industry-standard, enabling easy PCB layout and drop-in replacement in many designs.
Typical applications include industrial process control, bridge amplifiers, medical instrumentation, and data acquisition systems. The AD8227ARZ is particularly suited for applications requiring high accuracy over a wide input voltage range, such as motor control current sensing and battery monitoring.
When designing with the AD8227ARZ, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. The gain-setting resistor should be a precision resistor with low temperature coefficient to maintain gain accuracy. For best CMRR performance, keep the input traces balanced and shielded.
直接替换替代料： AD8227ARZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD8227ARZ （相同外形与封装尺寸） ——差异在于 Gain Range, Input Bias Current, Input Offset Voltage, Package, Amplifier Type.
快速对比工具——选择替代料号进行并排对比：
AD8227BRZ
✅ 直接替换✓ 有现货
$2.95 / 个
查看数据手册 →AD8227ARZ-RL7
✅ 直接替换✓ 有现货
$3.94 / 个
查看数据手册 →AD8226ARZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
联系询价
查看数据手册 →AD8227ARZ 最大额定值与电气特性
| Amplifier Type | Instrumentation Amplifier |
| Number of Circuits | 1 |
| Gain Range | 5 to 1000 |
| Supply Voltage Range (Dual) | ±2.25 V to ±18 V |
| Supply Voltage Range (Single) | 4.5 V to 36 V |
| 输出类型 | Rail-to-Rail |
| Bandwidth (G=5) | 250 kHz |
| Slew Rate | 1.2 V/µs |
| Input Bias Current | 27 nA |
| Offset Voltage | 200 µV |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 8-SOIC |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| 引脚数 | 8 |
AD8227ARZ 引脚配置
| 引脚 1 | RG — Gain setting resistor |
| 引脚 2 | -IN — Inverting input |
| 引脚 3 | +IN — Non-inverting input |
| 引脚 4 | V- — Negative supply |
| 引脚 5 | REF — Reference voltage |
| 引脚 6 | OUT — Output |
| 引脚 7 | V+ — Positive supply |
| 引脚 8 | RG — Gain setting resistor |
典型应用
AD8227ARZ 适用于 6 应用s: Industrial Process Control, Medical Instrumentation, Bridge Amplifiers, Data Acquisition Systems, Motor Control Current Sensing, Battery Monitoring.
Industrial Process Control
The AD8227ARZ is ideal for industrial process control systems that require precise amplification of sensor signals from bridges, thermocouples, and strain gauges. Its wide supply range of ±2.25 V to ±18 V allows operation from standard industrial power rails, while the gain range of 5 to 1000 set by a single resistor simplifies calibration. The high CMRR rejects common-mode noise from long sensor leads, ensuring accurate measurement in noisy factory environments. The rail-to-rail output maximizes dynamic range, and the -40°C to +125°C temperature range ensures reliable operation in harsh conditions.
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Medical Instrumentation
In medical instrumentation, the AD8227ARZ provides accurate amplification of biopotential signals such as ECG and EEG. Its low input bias current of 27 nA minimizes loading on high-impedance electrodes, and the wide supply range supports both battery-powered and line-powered devices. The gain range of 5 to 1000 allows flexible signal conditioning, while the rail-to-rail output ensures compatibility with ADCs. The device's low offset voltage and drift contribute to reliable patient monitoring, and its small SOIC-8 package is suitable for compact medical devices.
推荐
Bridge Amplifiers
The AD8227ARZ is well-suited for bridge amplifier applications, such as load cells and pressure sensors. Its high CMRR rejects common-mode voltage from the bridge, and the gain range of 5 to 1000 allows precise scaling of the small differential signal. The wide supply range accommodates both 5 V and ±15 V systems, and the rail-to-rail output provides maximum headroom. The device's low offset voltage and drift ensure accurate measurement over temperature, making it ideal for industrial weighing and pressure monitoring systems.
推荐
Data Acquisition Systems
The AD8227ARZ is a key component in data acquisition systems, where it conditions low-level sensor signals before ADC conversion. Its wide supply range and rail-to-rail output ensure compatibility with various ADC input ranges, and the gain range of 5 to 1000 allows optimal signal scaling. The device's low noise and high CMRR preserve signal integrity, while the SOIC-8 package enables compact PCB layouts. It is suitable for multi-channel systems where multiple in-amps are used to condition different sensors.
推荐
Motor Control Current Sensing
The AD8227ARZ is used in motor control systems to amplify the voltage across a shunt resistor for current sensing. Its wide common-mode input range and high CMRR allow accurate measurement of phase currents in the presence of high common-mode voltages. The gain range of 5 to 1000 enables precise scaling of the shunt voltage, and the rail-to-rail output interfaces directly with ADCs or comparators. The device's wide supply range supports both low-voltage and industrial motor drives, and its robust temperature range ensures reliable operation in demanding environments.
推荐
Battery Monitoring
The AD8227ARZ is ideal for battery monitoring systems, where it amplifies the small voltage across a sense resistor to measure charge and discharge currents. Its low input bias current minimizes measurement error, and the wide supply range allows operation from the battery voltage itself. The gain range of 5 to 1000 provides flexibility in scaling, and the rail-to-rail output ensures efficient use of the ADC range. The device's low power consumption and small package make it suitable for portable and embedded battery management systems.
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推荐产品汇总
工程参考数据： AD8227ARZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD8227BRZ | AD8227ARZ-RL7 | AD8226ARZ | AD8221ARZ | AD620ARZ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Gain Range | 5 to 1000 | 5 to 1000 | 5 to 1000 | 1 to 1000 | 1 to 1000 | 1 to 1000 |
| Supply Voltage Range | ±2.25 V to ±18 V | ±2.25 V to ±18 V | ±2.25 V to ±18 V | ±2.25 V to ±18 V | ±2.3 V to ±18 V | ±2.3 V to ±18 V |
| Input Bias Current | 27 nA | 20 nA | 27 nA | 25 nA | 0.5 nA | 1 nA |
| Bandwidth (G=5) | 250 kHz | 250 kHz | 250 kHz | 200 kHz | 800 kHz | 120 kHz |
| Slew Rate | 1.2 V/µs | 1.2 V/µs | 1.2 V/µs | 0.8 V/µs | 2 V/µs | 1.2 V/µs |
| Offset Voltage | 200 µV | 100 µV | 200 µV | 200 µV | 25 µV | 50 µV |
关键差异点
- Wide supply range with rail-to-rail output （对比 AD620ARZ)
- Low input bias current （对比 AD8226ARZ)
- Higher bandwidth at gain of 5 （对比 AD620ARZ)
设计说明
Ensure proper power supply decoupling. Place 0.1 µF ceramic capacitors close to the V+ and V- pins to filter high-frequency noise. For single-supply operation, connect the REF pin to a low-impedance reference voltage, typically mid-supply, to maximize output swing.
For best CMRR performance, keep the input traces balanced and shielded. Use a ground plane under the device and route the gain-setting resistor (RG) with short, direct traces to minimize parasitic capacitance. Avoid routing high-speed digital signals near the input pins.
The gain-setting resistor must be a precision resistor with low temperature coefficient to maintain gain accuracy. Use 0.1% tolerance or better. Also, ensure the input common-mode voltage stays within the specified range to avoid output saturation.
合规信息
RoHS compliant per Analog Devices product page. Other compliance data not specified in provided data.
