AD8629ARZ - Zero-Drift Dual Op Amp | Analog Devices
MPN： AD8629ARZ ✓ 啟用中AD8629ARZ 概覽
A zero-drift amplifier is an operational amplifier that continuously corrects its input offset voltage using auto-zeroing or chopping techniques, resulting in microvolt-level offset and near-zero drift over temperature and time. In the amplifier hierarchy, a zero-drift amplifier is a type of precision operational amplifier, which is a subset of linear integrated circuits used for signal conditioning in measurement systems. Engineers select zero-drift amplifiers for sensors, bridges, and data acquisition where DC accuracy is essential.
The AD8629ARZ offers a maximum input offset voltage of 1µV, input offset drift of 0.002µV/°C, and maximum input bias current of 100pA. Its gain, CMRR, and PSRR are all 130dB, providing strong rejection of common-mode and power-supply disturbances. Rail-to-rail input/output swing maximizes dynamic range in single-supply applications, while the dual-channel configuration supports differential or multi-stage designs.
Internally, the AD8629ARZ uses Analog Devices auto-zero topology, which does not require external capacitors and reduces digital switching noise compared with conventional chopper-stabilized amplifiers. The architecture maintains low noise and wide bandwidth while preserving the DC precision of an auto-zero part. The 8-SOIC package is industry standard, straightforward for PCB layout, and compatible with automated assembly.
Typical applications include precision instrumentation, thermocouple and RTD conditioning, medical monitoring, battery-powered portable instruments, IoT sensor nodes, and bridge/strain-gauge signal conditioning. The low offset and drift let systems maintain accuracy for long periods without calibration.
When designing with the AD8629ARZ, place 0.1µF ceramic decoupling capacitors close to the supply pins, avoid driving inputs beyond the rails to prevent latch-up, and use low-value feedback resistors to reduce noise. If a higher supply rail is needed, consider the ADA4522-2ARZ.
直接替換替代品，適用於 AD8629ARZ — 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： AD8629ARZ （相同外形與佔位） — 差異在於 Package, Slew Rate, Gain Bandwidth Product, Number of Channels, Operating Temperature Range.
AD8629ARZ-REEL7
✅ 直接替換聯絡詢價
查看資料表 →AD8628ARZ
⚡ 相同封裝 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4522-2ARZ
⚡ 相同封裝 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MS8629
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD8629ARZ 最大額定值與電氣特性
| Number of Channels | 2 |
| Supply Voltage Range | 2.7 V to 5 V |
| Input Offset Voltage (max) | 1 µV |
| Input Offset Drift | 0.002 µV/°C |
| Input Bias Current (max) | 100 pA |
| Gain | 130 dB |
| CMRR | 130 dB |
| PSRR | 130 dB |
| Rail-to-Rail Input/Output | Yes |
| 封裝 | 8-SOIC |
| 工作溫度範圍 | -40°C to +125°C |
| RoHS 狀態 | Compliant |
| 安裝類型 | Surface Mount |
| Amplifier Type | Zero-Drift |
AD8629ARZ 腳位配置
| 腳位 1 | OUT A — Output of amplifier A |
| 腳位 2 | -IN A — Inverting input of amplifier A |
| 腳位 3 | +IN A — Non-inverting input of amplifier A |
| 腳位 4 | V- — Negative supply |
| 腳位 5 | +IN B — Non-inverting input of amplifier B |
| 腳位 6 | -IN B — Inverting input of amplifier B |
| 腳位 7 | OUT B — Output of amplifier B |
| 腳位 8 | V+ — Positive supply |
典型應用
AD8629ARZ 適用於 6 應用s: Precision Instrumentation, Thermocouple and RTD Conditioning, Medical Monitoring, Battery-Powered Portable Instruments, IoT Sensor Nodes, Bridge and Strain-Gauge Signal Conditioning.
Precision Instrumentation
The AD8629ARZ's 1 µV offset and 0.002 µV/°C drift ensure accurate DC measurements in instrumentation. Its rail-to-rail output maximizes dynamic range, and the dual channel supports differential or multi-stage designs. The low bias current of 100 pA minimizes errors in high-impedance sources, making it ideal for data acquisition systems.
推薦
Thermocouple and RTD Conditioning
The AD8629ARZ's ultra-low offset and drift are essential for accurate temperature sensing. Its high CMRR of 130 dB rejects common-mode noise in thermocouple leads, while the low bias current prevents self-heating errors in RTDs. The dual channel allows for cold-junction compensation and amplification in a single package.
推薦
Medical Monitoring
In medical devices, the AD8629ARZ provides the precision needed for ECG, EEG, and blood glucose monitors. Its low offset and drift ensure stable readings over time, and the 2.7V to 5V supply range is compatible with battery-powered equipment. The small 8-SOIC package saves space in portable designs.
推薦
Battery-Powered Portable Instruments
The AD8629ARZ's low supply voltage (2.7V to 5V) and low power consumption make it ideal for portable instruments. Its rail-to-rail output maximizes battery life by allowing the output to swing close to the supply rails. The dual channel reduces component count, saving board space in compact designs.
推薦
IoT Sensor Nodes
For IoT sensor nodes, the AD8629ARZ provides accurate signal conditioning with minimal power. Its low offset and drift reduce calibration requirements, and the 2.7V to 5V supply range matches common IoT power rails. The dual channel allows for multiple sensor inputs in a single device, reducing cost and complexity.
推薦
Bridge and Strain-Gauge Signal Conditioning
The AD8629ARZ's high CMRR (130 dB) and low offset are critical for bridge measurements. Its rail-to-rail output allows full-scale output for small bridge signals, and the low drift ensures accuracy over temperature. The dual channel supports both excitation and amplification in a single package.
推薦
推薦產品摘要
工程參考資料，適用於 AD8629ARZ — 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 | AD8629ARZ-REEL7 | AD8628ARZ | ADA4522-2ARZ | MS8629 |
|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | MS |
| Number of Channels | 2 | 2 | 1 | 2 | 2 |
| Supply Voltage Range | 2.7V to 5V | 2.7V to 5V | 2.7V to 5V | 4.5V to 55V | 2.7V to 5.5V |
| Input Offset Voltage (max) | 1 µV | 1 µV | 1 µV | 2.5 µV | 5 µV |
| Input Offset Drift | 0.002 µV/°C | 0.002 µV/°C | 0.002 µV/°C | 0.002 µV/°C | 0.02 µV/°C |
| Input Bias Current (max) | 100 pA | 100 pA | 100 pA | 50 pA | 100 pA |
| CMRR | 130 dB | 130 dB | 130 dB | 140 dB | 120 dB |
主要差異化特點
- Ultra-low offset voltage of 1 µV (對比MS8629)
- Near-zero drift of 0.002 µV/°C (對比MS8629)
- High CMRR of 130 dB (對比MS8629)
設計說明
Place 0.1µF ceramic decoupling capacitors close to the V+ and V- pins to ensure stable operation. For best performance, use a 10µF tantalum capacitor in parallel for low-frequency decoupling. The AD8629ARZ operates from 2.7V to 5V, so ensure the supply is clean and within this range.
Keep the feedback network components close to the amplifier to minimize parasitic capacitance and inductance. Use a ground plane to reduce noise and provide a low-impedance return path. For high-impedance inputs, guard traces can reduce leakage currents.
Avoid driving inputs beyond the supply rails to prevent latch-up. Use input protection resistors if necessary. Also, ensure the output is not shorted to ground or supply for extended periods, as this can cause thermal stress. For best noise performance, use low-value feedback resistors (e.g., 1kΩ to 10kΩ).
合規資訊
RoHS compliant per Analog Devices product page. AEC-Q100 not applicable for this commercial-grade part.
