AD8227BRZ - Wide Supply Range In-Amp | Analog Devices
料号： AD8227BRZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.37 | $43.70 |
| 100 | $3.95 | $395.00 |
| 500 | $3.4 | $1,700.00 |
| 1,000 | $2.95 | $2,950.00 |
AD8227BRZ 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 specialized operational amplifier (op-amp) topology with high input impedance and high common-mode rejection ratio (CMRR), making it ideal for precise measurement of small signals in noisy environments. In the hierarchy of analog signal processing, an in-amp is a key building block within the broader category of linear amplifiers, which are essential in data acquisition systems, sensor interfaces, and medical instrumentation.
Key features of the AD8227BRZ include a wide supply range, rail-to-rail output swing, and a gain range of 5 to 1000 set by a single external resistor. The device also offers a low quiescent current of 700 µA, making it suitable for battery-powered applications. Its input offset voltage is 100 µV, and it has a CMRR of 80 dB at G = 5, providing excellent rejection of common-mode noise. The AD8227BRZ is specified over the industrial temperature range of -40°C to +125°C, ensuring reliable operation in harsh environments.
Technically, the AD8227 uses a three-op-amp architecture with a precision laser-trimmed resistor network, achieving high accuracy without external trimming. The gain is set by an external resistor, RG, connected between the RG pins, allowing flexible configuration. The device's rail-to-rail output stage enables maximum dynamic range, and its wide input range accommodates signals beyond the supply rails, enhancing its versatility. The AD8227BRZ is designed for low power consumption, making it ideal for portable and remote sensing applications.
Typical applications include industrial process control, bridge amplifiers, medical instrumentation, and data acquisition systems. In industrial settings, the AD8227BRZ can amplify small sensor signals from thermocouples or strain gauges, rejecting common-mode interference. In medical devices, it provides accurate ECG or EEG signal conditioning. Its wide supply range and low power make it suitable for battery-operated equipment.
When designing with the AD8227BRZ, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. The reference pin (VREF) should be driven with a low-impedance source to maintain CMRR. For optimal performance, use precision resistors for the gain-setting resistor to minimize gain error.
直接替换替代料： AD8227BRZ ——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： AD8227BRZ （相同外形与封装尺寸） ——差异在于 Gain Range, Input Bias Current, Input Voltage Range, Amplifier Type, Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
AD8226ARZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
联系询价
查看数据手册 →AD8227ARZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$3.1 / 个
查看数据手册 →AD8228ARZ
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD620ARZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$7.2 / 个
查看数据手册 →INA128UA
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA826AIDR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD8227BRZ 最大额定值与电气特性
| Amplifier Type | Instrumentation Amplifier |
| Number of Channels | 1 |
| Gain Range | 5 to 1000 (set by one external resistor) |
| Bandwidth (G = 5) | 250 kHz |
| Input Offset Voltage | 100 µV (B grade) |
| CMRR (G = 5) | 80 dB |
| 静态电流 | 700 µA |
| Single Supply Voltage Range | 4.5 V to 36 V |
| Dual Supply Voltage Range | ±2.25 V to ±18 V |
| 输出类型 | Rail-to-Rail |
| 输入电压范围 | Wide input range (beyond supply rails) |
| 工作温度范围 | -40°C to +125°C |
| 封装 / 外壳 | 8-SOIC (0.154", 3.90 mm Width) |
| 引脚数 | 8 |
| 安装类型 | Surface Mount |
| RoHS 状态 | unknown |
AD8227BRZ 引脚配置
| 引脚 1 | RG — Gain-setting resistor terminal |
| 引脚 2 | -IN — Inverting input |
| 引脚 3 | +IN — Non-inverting input |
| 引脚 4 | -VS — Negative supply or ground |
| 引脚 5 | REF — Reference input for output level shifting |
| 引脚 6 | OUT — Instrumentation amplifier output |
| 引脚 7 | +VS — Positive supply |
| 引脚 8 | RG — Gain-setting resistor terminal |
典型应用
AD8227BRZ 适用于 6 应用s: Industrial Process Control, Medical Instrumentation (ECG/EEG), Bridge Amplifier / Load Cell, Data Acquisition Systems, Battery-Powered Portable Instrumentation, Thermocouple and Temperature Sensing.
Industrial Process Control
The AD8227BRZ is ideal for industrial process control because its wide supply range of ±2.25 V to ±18 V or 4.5 V to 36 V directly interfaces with 24 V industrial rails. Its 80 dB CMRR at G = 5 rejects ground noise and common-mode interference from long sensor cables. In a typical transmitter loop, the in-amp conditions a 4-20 mA or mV-level sensor signal before driving an ADC such as the AD7172-2BRUZ. The single external gain resistor allows gain settings from 5 to 1000, covering thermocouple and strain-gauge ranges without additional components. The -40°C to +125°C temperature range ensures reliable operation in factory-floor environments.
推荐
Medical Instrumentation (ECG/EEG)
In medical instrumentation such as ECG and EEG front ends, the AD8227BRZ amplifies microvolt-level biopotential signals while rejecting common-mode mains interference. The 100 µV input offset voltage and 80 dB CMRR at G = 5 provide accurate base-line performance. The rail-to-rail output maximizes dynamic range for the subsequent ADC, for example the AD7768-4BSTZ 24-bit converter. Low 700 µA quiescent current also supports battery-operated patient monitors. The single-resistor gain programmability allows different lead configurations to be accommodated with one BOM. For multi-channel designs, the AD8227BRZ can be paired with precision op amps such as the ADA4522-2ARZ for driven-right-leg or filtering stages.
推荐
Bridge Amplifier / Load Cell
The AD8227BRZ is well suited for load cell and strain-gauge bridge amplifiers because its differential input directly measures the bridge output. The wide input range allows the amplifier to handle bridge excitation voltages on 5 V or 24 V systems, and the high CMRR rejects common-mode voltage between the bridge half-bridge nodes. With a gain set from 5 to 1000 using one external resistor, the user can scale the bridge output to match a downstream ADC full-scale range. The rail-to-rail output stage preserves signal headroom, making it easier to interface with single-supply ADCs. A typical signal chain connects the AD8227BRZ output to the AD7172-2BRUZ differential input for precise weight or force measurement.
推荐
Data Acquisition Systems
In a data acquisition system, the AD8227BRZ conditions small differential signals from sensors before analog-to-digital conversion. Its 250 kHz bandwidth at G = 5 supports moderate-speed multiplexed measurements, while the gain range of 5 to 1000 allows different sensor types to be accommodated with one design. The wide supply range lets the in-amp share the same ±15 V rails as the rest of the analog front end. The rail-to-rail output can directly drive the input of a precision ADC such as the AD7606BSTZ-4RL or AD7175-2BRUZ. For multi-channel DAQ cards, several AD8227BRZ amplifiers can be arrayed, and the low 700 µA quiescent current helps manage thermal budget in densely populated cards.
推荐
Battery-Powered Portable Instrumentation
The AD8227BRZ is an excellent choice for battery-powered portable instruments because of its 700 µA quiescent current and wide 4.5 V to 36 V single-supply operation. This allows direct operation from a 9 V battery or a 5 V regulated rail while preserving the signal conditioning accuracy needed in handheld meters. The rail-to-rail output maximizes ADC input range, improving resolution in a low-voltage system. The device's small 8-SOIC package minimizes board area. When paired with the ADA4522-2ARZ and AD7172-2BRUZ, the complete signal chain can be built for measurement of temperature, pressure, or pH in a compact, low-power instrument.
推荐
Thermocouple and Temperature Sensing
For thermocouple and temperature sensing, the AD8227BRZ provides the differential gain needed to amplify the small mV-level Seebeck voltage. Its high CMRR rejects common-mode ground noise in industrial environments, and the wide input range allows direct connection to thermocouple junctions with large common-mode voltages. A single external resistor sets the gain to match the thermocouple type and temperature range. The output can be digitized by the AD7172-2BRUZ or another precision ADC, while a reference such as the REF192ESZ provides a stable bias for cold-junction compensation. The -40°C to +125°C operating range covers both the sensor environment and the control electronics.
推荐
推荐产品汇总
工程参考数据： AD8227BRZ ——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 | AD8226ARZ | AD8227ARZ | AD8228ARZ | AD620ARZ | INA128UA | INA826AIDR |
|---|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Gain Range | 5 to 1000 (external resistor) | 1 to 1000 (external resistor) | 5 to 1000 (external resistor) | Fixed 5, 10, or 100 | 1 to 1000 (external resistor) | 1 to 1000 (external resistor) | 1 to 1000 (external resistor) |
| Input Offset Voltage | 100 µV max (B grade) | 100 µV max | 125 µV max (A grade) | 90 µV max | 50 µV max | 50 µV max | 100 µV max |
| CMRR | 80 dB at G = 5 | 80 dB at G = 5 | 76 dB at G = 5 (A grade) | 90 dB at G = 10 | 93 dB at G = 10 | 120 dB at G = 100 | 90 dB at G = 10 |
| Quiescent Current | 700 µA | 700 µA | 700 µA | 700 µA | 900 µA | 700 µA | 200 µA |
| Single Supply Range | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.5 V to 36 V | 4.6 V to 36 V | 4.5 V to 36 V | 2.7 V to 36 V |
关键差异点
- Low cost and wide supply range with one-resistor gain setting （对比 AD8226ARZ)
- 100 µV B-grade input offset voltage in a low-cost in-amp （对比 AD8227ARZ)
- Wide single-supply operation down to 4.5 V and up to 36 V （对比 INA826AIDR)
设计说明
Place 0.1 µF ceramic decoupling capacitors as close as possible to the +VS (pin 7) and -VS (pin 4) pins. A 10 µF bulk capacitor may be added on the supply rail for larger load transients. Keep the gain-setting resistor RG close to pins 1 and 8 to minimize parasitic capacitance and to reduce gain error caused by trace resistance.
The REF pin (pin 5) must be driven from a low-impedance source to maintain CMRR. If the REF pin is left floating or driven from a high impedance, common-mode rejection will degrade significantly. For single-supply operation, bias the REF pin to mid-supply using a precision reference such as REF192ESZ or a low-impedance op-amp buffer.
At a total supply of 36 V and 700 µA quiescent current, the AD8227BRZ dissipates approximately 25 mW without load, which is negligible in an 8-SOIC package. However, when driving a heavy load such as 10 kΩ to ground in a split-supply configuration, output stage dissipation depends on output voltage. The 8-SOIC thermal resistance is adequate for most instrumentation applications, but avoid driving low-impedance loads (<2 kΩ) at high ambient temperatures without checking the junction temperature.
合规信息
Compliance information was not explicitly stated in the verified web data. Confirm RoHS/REACH status on the distributor product page or Analog Devices official product page before volume production.
