AD8227ARZ-RL7 - Wide Supply In-Amp | Analog Devices
MPN： AD8227ARZ-RL7 ✓ 啟用中AD8227ARZ-RL7 概覽
An instrumentation amplifier (in-amp) is a precision differential amplifier with high common-mode rejection, typically used to extract small signals from sensors, bridges, or transducers in the presence of common-mode noise. It sits above the general category of operational amplifiers and is a key building block of signal-conditioning chains for analog-to-digital converters. The AD8227 belongs to this product hierarchy: instrumentation amplifier -> precision amplifier -> analog signal conditioning -> integrated circuit. Its single-resistor gain programming and balanced pinout make it easy to apply in factory automation, medical monitors, and automotive modules.
Key features include the 5-to-1000 gain range, wide dual/single supply operation, rail-to-rail output swing, and a REF pin protected by ESD diodes for level shifting into single-supply ADCs. The A grade (ARZ) exhibits about 27 nA typical input bias current, while the B grade (BRZ) improves this to 20 nA. The input common-mode range and the ability to drive rail-to-rail outputs allow the signal to make full use of supply rails.
From an architecture perspective, the AD8227 is a three-op-amp style instrumentation amplifier enhanced for wide supply and low cost. It merges a precision front end with an output stage capable of sensing the negative rail, making it suitable for systems that only have one power supply. This low-cost approach is aimed at high-volume industrial and consumer measurement applications where price matters, but CMRR and gain accuracy cannot be sacrificed.
Typical applications include load-cell and strain-gauge bridge conditioning, industrial current-shunt monitoring, medical biosignal acquisition, automotive sensor interfaces, and ADC driver circuits where the REF pin shifts the output. The wide input range and single-supply compatibility make it a versatile choice for mixed-signal boards.
When designing with this part, remember to keep the external gain resistor close to the RG pins with low thermal drift, and never drive the REF pin more than 0.3 V beyond the supplies. These simple precautions preserve gain accuracy and prevent ESD diode conduction.
直接替換替代品，適用於 AD8227ARZ-RL7 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD8227ARZ-RL7 （相同外形與佔位） — 差異在於 Gain Range, Package, Input Bias Current, Output Type, RoHS Status.
AD8227BRZ-RL7
✅ 直接替換聯絡詢價
查看資料表 →AD8226ARZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD620ARZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →INA826AIDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD8227ARZ-RL7 最大額定值與電氣特性
| Product Type | Instrumentation Amplifier |
| Number of Channels | 1 |
| Gain Range | 5 to 1000 (set by one external resistor) |
| Dual Supply Voltage Range | ±1.5 V to ±18 V |
| Single Supply Voltage Range | 2.2 V to 36 V |
| 輸出類型 | Rail-to-Rail |
| Input Common-Mode Range | Includes below negative supply |
| Input Bias Current (A Grade, typ) | 27 nA |
| Input Bias Current (B Grade, typ) | 20 nA |
| REF Pin Protection | ESD diodes; must not exceed ±VS by more than 0.3 V |
| 封裝 | 8-SOIC (SOIC-8) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (RL7) |
| RoHS 狀態 | unknown |
AD8227ARZ-RL7 腳位配置
| 腳位 1 | RG — Gain set resistor pin |
| 腳位 2 | IN- — Inverting input |
| 腳位 3 | IN+ — Non-inverting input |
| 腳位 4 | VS- — Negative supply |
| 腳位 5 | REF — Reference input for output level shifting |
| 腳位 6 | OUT — Amplifier output |
| 腳位 7 | VS+ — Positive supply |
| 腳位 8 | RG — Gain set resistor pin |
典型應用
AD8227ARZ-RL7 適用於 6 應用s: Load Cell and Strain Gauge Bridge Conditioning, Industrial Current-Sense and 4-20 mA Loop Monitor, Medical Biosignal Acquisition (ECG/EMG), Automotive Sensor Interface, Single-Supply ADC Driver and Data Acquisition, Battery-Powered Portable Instrumentation.
Load Cell and Strain Gauge Bridge Conditioning
The AD8227ARZ-RL7 is an excellent front end for load cells and strain-gauge bridges because its input common-mode range extends below the negative supply, allowing direct ground-referenced bridge outputs to be amplified with a single 2.2-36 V supply. With gain set from 5 to 1000 by one RG resistor, the user can match the bridge sensitivity and full-scale ADC span. The rail-to-rail output maximizes converter dynamic range, and the REF pin permits level shifting to center the output in single-supply ADCs.
推薦
Industrial Current-Sense and 4-20 mA Loop Monitor
In industrial current-shunt monitoring, the AD8227ARZ-RL7 amplifies small differential voltages across sense resistors while rejecting common-mode noise. Its wide supply range (2.2 V to 36 V) accommodates 24 V industrial rails, and the ability to sense below ground simplifies low-side monitoring. The single-resistor gain programmability (G=5 to 1000) lets one PCB support multiple current ranges. For high-side monitoring at very high common-mode voltages, pair with a dedicated current-sense amplifier instead.
推薦
Medical Biosignal Acquisition (ECG/EMG)
For ECG/EMG acquisition, the AD8227ARZ-RL7 provides a low-cost, single-supply instrumentation front end with 5-1000 gain and rail-to-rail output. Its input bias current (27 nA for A grade, 20 nA for B grade) is adequate for electrode interface designs when combined with a high-input-impedance buffer. The REF pin allows the output to be level-shifted into a single-supply ADC. System-level safety isolation (IEC 60601) must be implemented externally; the device itself is not medical-certified.
推薦
Automotive Sensor Interface
The AD8227ARZ-RL7 is suited for automotive sensor interfaces such as pressure sensors, position sensors, and current transducers, where wide supply range (up to 36 V) and low cost are important. It amplifies small sensor signals while rejecting common-mode interference from the vehicle's 12 V/24 V bus. The rail-to-rail output simplifies interfacing with MCU ADCs. For AEC-Q100-qualified alternatives, check the AD8227BRZ-RL7 grade or support in-amps with automotive certification because the standard AD8227 is not explicitly AEC-Q100 qualified per the provided data.
推薦
Single-Supply ADC Driver and Data Acquisition
The AD8227ARZ-RL7 excels as a general-purpose ADC driver in mixed-signal data acquisition because its REF pin can be tied to the ADC reference to level-shift the output into the converter's input span. Operating from a single 3.3 V or 5 V rail, the in-amp amplifies bridge or sensor signals with rail-to-rail output, and the gain resistor range (5 to 1000) matches many transducer full-scale levels. For high-resolution 24-bit systems, pair with low-noise ADCs and add an RC filter between output and ADC input.
推薦
Battery-Powered Portable Instrumentation
For battery-powered portable meters and handheld test equipment, the AD8227ARZ-RL7's 2.2 V minimum supply and low quiescent current make it attractive. It can amplify signals near ground without dual supplies, saving board space and battery cost. The rail-to-rail output lets a 3.3 V ADC capture the full usable range. The single-resistor gain set keeps BOM count low. Check the datasheet for quiescent-current details; for ultra-low-power designs, consider a micropower in-amp instead.
推薦
推薦產品摘要
工程參考資料，適用於 AD8227ARZ-RL7 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD8227BRZ-RL7 | AD8226ARZ | AD620ARZ | INA826AIDR | INA128UA |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (SOIC-8) | 8-SOIC (SOIC-8) | 8-SOIC (SOIC-8) | 8-SOIC (SOIC-8) | 8-SOIC (SOIC-8) | 8-SOIC (SOIC-8) |
主要差異化特點
- Low-cost wide supply range with 2.2 V single-supply operation (對比AD620ARZ)
- B-grade option reduces input bias current (對比AD8227BRZ-RL7)
- Single-resistor gain programming from 5 to 1000 (對比INA826AIDR)
設計說明
Place the gain-setting RG resistor close to pins 1 and 8 to minimize stray capacitance that alters gain accuracy and bandwidth. Use a 1% or better metal-film resistor with low temperature coefficient, and keep traces short and symmetric. For high gains (G>100), a resistor with <100 ppm/°C drift is recommended to maintain stable output over temperature.
Never drive the REF pin more than 0.3 V beyond either supply rail. The REF pin is protected with ESD diodes, and overdriving it conducts through those diodes, causing output errors and possible latch-up. Tie REF to a low-impedance reference such as an ADC VREF, and avoid connecting high-impedance sources directly to REF.
Bypass +VS and -VS with 0.1 µF ceramic capacitors placed close to the pins, plus a 10 µF bulk capacitor on each supply. For single-supply operation, verify the input common-mode range with the signal source; although the AD8227 can accept inputs below the negative rail, keeping the input within the specified common-mode range preserves linearity and CMRR.
For high-impedance sensor interfaces, add a ground guard trace around the IN+ and IN- inputs and keep them away from digital switching traces. A low-leakage FR-4 layout with clean ground fill reduces parasitic leakage current into the inputs. If long input cables are used, add differential RFI filtering before the amplifier.
合規資訊
No compliance statements are present in the provided verified web data. The ARZ suffix suggests lead-free finish per ADI standard naming, but this is not verified. The part is not marked AEC-Q100 in the available data.
