AD8226BRZ-RL7 - Wide Supply Range In-Amp | Analog Devices
MPN： AD8226BRZ-RL7 ✓ 啟用中AD8226BRZ-RL7 概覽
An instrumentation amplifier (in-amp) is a precision differential amplifier with high input impedance and high common-mode rejection, used to amplify small signals in the presence of large common-mode voltages. It is a key building block in precision analog signal chains, often following a sensor bridge or transducer, and preceding an ADC. The AD8226 belongs to the family of instrumentation amplifiers, which are a subset of operational amplifiers optimized for differential measurement.
Key features of the AD8226 include a gain range of 1 to 1000 set by a single external resistor, rail-to-rail output swing, and a wide input voltage range that includes below ground. The device also offers excellent AC and DC performance, with a typical gain error of 0.1% (max) and gain drift of 10 ppm/°C (max). Quiescent current is only 350 µA (typical), making it suitable for low-power, battery-operated equipment. The AD8226 is specified over the extended industrial temperature range of -40°C to +125°C.
Technically, the AD8226 uses a three-op-amp topology with a precision laser-trimmed resistor network, ensuring high accuracy and stability. The input stage provides high common-mode rejection, while the output stage delivers rail-to-rail swing. The device is fully specified for both single and dual supply operation, and its input range extends below the negative rail, allowing it to handle signals that go slightly below ground.
Typical applications include industrial process control, bridge amplifiers, medical instrumentation, and data acquisition systems. The AD8226 is ideal for amplifying small differential signals from sensors such as strain gauges, thermocouples, and current shunt monitors. Its wide supply range and low power make it suitable for portable and battery-operated equipment.
When designing with the AD8226, ensure that the reference pin is properly driven to set the output common-mode voltage, and use a precision resistor for gain setting to maintain accuracy. Bypass the supply pins with 0.1 µF ceramic capacitors close to the device to ensure stability.
直接替換替代品，適用於 AD8226BRZ-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： AD8226BRZ-RL7 （相同外形與佔位） — 差異在於 Gain Range, Input Offset Voltage, Quiescent Current, Operating Temperature Range, Amplifier Type.
AD8227BRZ
✅ 直接替換聯絡詢價
查看資料表 →AD8223ARZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD8221ARZ
✅ 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 →INA826AID
✅ 直接替換📋 參考替代品（不在目錄中）
AD8226BRZ-RL7 最大額定值與電氣特性
| Product Category | Instrumentation Amplifier |
| Number of Channels | 1 Circuit |
| Gain Range | 1 to 1000 (set by 1 external resistor) |
| Single Supply Voltage | 4.5 V to 36 V |
| Dual Supply Voltage | ±2.25 V to ±18 V |
| 靜態電流 | 350 µA typical |
| Gain Error | 0.1% max |
| Gain Drift | 10 ppm/°C max |
| Rail-to-Rail Output | Yes |
| Input Range Below Ground | Yes |
| 工作溫度範圍 | -40°C to +125°C |
| 封裝 / 外殼 | 8-SOIC (BRZ suffix) |
| 安裝類型 | Surface Mount |
| 拓撲 | Three-op-amp instrumentation amplifier |
| Gain Setting Method | One external resistor |
| Reference Pin | Yes (sets output common-mode voltage) |
AD8226BRZ-RL7 腳位配置
| 腳位 1 | RG — Gain-setting resistor terminal |
| 腳位 2 | -IN — Inverting input |
| 腳位 3 | +IN — Non-inverting input |
| 腳位 4 | -VS — Negative supply |
| 腳位 5 | REF — Reference pin (sets output common-mode voltage) |
| 腳位 6 | OUT — Output |
| 腳位 7 | +VS — Positive supply |
| 腳位 8 | RG — Gain-setting resistor terminal |
典型應用
AD8226BRZ-RL7 適用於 6 應用s: Industrial Process Control, Bridge / Load Cell Amplifier, Medical ECG / Patient Monitoring, Data Acquisition Systems, Current Shunt Monitor, Portable / Battery-Powered Instrumentation.
Industrial Process Control
The AD8226BRZ-RL7 is ideal for industrial process control where 4-20 mA loop transmitters run from 24 V supplies. Its 4.5 V to 36 V single-supply range directly handles 24 V rails, while the 350 µA quiescent current keeps the loop budget low. The gain is set with one external resistor, so a single in-amp can serve many sensor types. The rail-to-rail output drives a precision ADC such as the AD7172-2BRUZ, enabling accurate bridge, thermocouple, and pressure sensor measurements in harsh noise environments.
推薦
Bridge / Load Cell Amplifier
Strain-gauge bridges generate small differential signals riding on a common-mode voltage near mid-supply. The AD8226BRZ-RL7’s wide input range and 0.1% max gain error preserve bridge accuracy, and gains from 1 to 1000 allow a single design to cover 10 kg to 1000 kg load cells. Use a precision metal-film resistor between RG pins to set the exact gain. After amplification, a 24-bit sigma-delta ADC like the AD7799BRUZ digitizes the signal with low noise.
推薦
Medical ECG / Patient Monitoring
Electrocardiogram (ECG) signals are low-level (0.5-5 mV) and contaminated by large 50/60 Hz common-mode voltages. The AD8226BRZ-RL7 can amplify these signals with high common-mode rejection while its low bias current preserves electrode integrity. Rail-to-rail output allows direct interface to single-supply ADC inputs. A driven-right-leg or reference pin connection can further suppress common-mode noise. The -40°C to +125°C temperature range supports body-worn and clinical monitors.
推薦
Data Acquisition Systems
Data acquisition systems need a flexible front end with high input impedance and programmable gain. The AD8226BRZ-RL7 delivers gains of 1 to 1000 using one resistor, so channel scaling can be updated without PCB changes. Its 350 µA quiescent current helps keep system power budgets low in multichannel boards. After the in-amp, a high-throughput ADC such as the AD7606BSTZ-4RL can capture synchronized samples. For lower-speed precision, the AD7172-2BRUZ provides 24-bit resolution.
推薦
Current Shunt Monitor
The AD8226BRZ-RL7 can amplify the small differential voltage across a shunt resistor in high-side current sensing applications. Its input voltage can go below ground, protecting against negative transients during inductive load switching. Set gain with one resistor; for example, 50 A through a 0.1 mΩ shunt produces 5 mV, requiring a gain of 100 to produce a 0.5 V ADC input. Pair with a precision ADC like the AD7124-4BRUZ-RL for industrial monitoring.
推薦
Portable / Battery-Powered Instrumentation
The AD8226BRZ-RL7 operates from a single supply as low as 4.5 V, making it suitable for two-cell Li-ion or four-cell alkaline systems. With only 350 µA typical quiescent current, it extends battery life in handheld field instruments. The rail-to-rail output maximizes the ADC input range. A zero-drift op amp such as the ADA4522-1ARZ can buffer the output when driving long cables or capacitive loads, while the in-amp remains the precision acquisition front end.
推薦
推薦產品摘要
工程參考資料，適用於 AD8226BRZ-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 | AD8223ARZ | AD8221ARZ | AD620ARZ | INA826AID |
|---|---|---|---|---|---|---|
| Package | 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 |
| Rail-to-Rail Output | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
主要差異化特點
- Gain range extends down to 1, unlike AD8227BRZ which has a minimum gain of 5 (對比AD8227BRZ)
- Lower quiescent current than AD620ARZ (對比AD620ARZ)
- Native Analog Devices portfolio support with low-cost, wide supply range (對比INA826AID)
設計說明
For AD8226, gain accuracy depends on the external resistor connected between pins 1 and 8. Use a 1% or better metal-film resistor and minimize parasitic capacitance to avoid frequency response peaking. Keep the gain resistor close to the pins and use a guard ring if the value is high (>100kΩ).
Place 0.1 µF low-ESR ceramic capacitors directly at V+ and V- pins to ground. For single-supply operation, add 10 µF bulk capacitor close to the device to handle load transients. The reference pin should be decoupled to ground with 0.1 µF to keep output common-mode stable.
AD8226 draws only 350 µA typical; however, output stage can source/sink several mA. In battery-powered designs, use a low-dropout regulator upstream and consider shutting down the in-amp with a series switch to save power in standby. Ensure input common-mode remains within specified input range to preserve linearity.
合規資訊
Compliance not explicitly listed in verified web data. Confirm on the Analog Devices product page for latest RoHS/REACH status.
