ADA4522-2ARZ - Dual 55V Zero-Drift Op Amp | Analog Devices
MPN： ADA4522-2ARZ ✓ 啟用中ADA4522-2ARZ 概覽
Zero-drift amplifiers are a class of operational amplifiers that use auto-zeroing or chopping techniques to continuously correct input offset voltage and its drift over time and temperature. They sit within the precision amplifier hierarchy: operational amplifier -> precision amplifier -> zero-drift/chopper amplifier -> analog signal chain component. This architecture makes them the default choice wherever microvolt-level accuracy must persist for years in the field.
Key specifications include a maximum offset voltage of 5 uV with typical offset of 1.5 uV, maximum offset drift of 22 nV/C, ultra-low voltage noise of 5.8 nV/√Hz typical at 1 kHz, and only 117 nV p-p from 0.1 Hz to 10 Hz. Input bias current is a low 50 pA typical. A 2.7 MHz gain-bandwidth product and 1.2 V/us slew rate provide adequate dynamic performance for most precision signal conditioning loops.
The proprietary auto-zero architecture pairs a main amplifier with a nulling amplifier, while integrated EMI filters suppress RF interference in electrically noisy factory environments. The device is fully specified from -40C to +125C, and the SOIC-8 footprint is compatible with standard dual op-amp layouts, enabling straightforward upgrades from legacy precision parts.
Typical applications include precision data acquisition, weigh scales, thermocouple and RTD signal conditioning, battery monitoring, and industrial process control. Low 1.2 mA per amplifier supply current also suits line-powered and portable instruments.
Design tip: place 0.1 uF bypass capacitors directly at the supply pins, and remember the chopping clock can intermodulate with input signals - filter inputs above 10 kHz where necessary.
直接替換替代品，適用於 ADA4522-2ARZ — 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： ADA4522-2ARZ （相同外形與佔位） — 差異在於 Package, Input Bias Current, Slew Rate, Amplifier Type, Gain Bandwidth Product.
ADA4522-2ARZ-R7
✅ 直接替換📋 參考替代品（不在目錄中）
OPA2187AIDR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
OPA2192IDR
✅ 直接替換聯絡詢價
查看資料表 →TLC2272ACD
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADA4522-2ARZ 最大額定值與電氣特性
| Amplifier Type | Zero-Drift (Chopper), EMI Enhanced |
| 通道數 | 2 (Dual) |
| Supply Voltage Range | 4.5 V to 55 V (single), ±2.25 V to ±27.5 V (dual) |
| Input Offset Voltage | 1.5 uV typ / 5 uV max |
| Offset Voltage Drift | 0.002 uV/C typ / 22 nV/C max |
| Input Voltage Noise Density | 5.8 nV/√Hz typ at 1 kHz |
| 0.1 Hz to 10 Hz Noise | 117 nV p-p typ |
| Input Bias Current | 50 pA typ |
| Gain-Bandwidth Product | 2.7 MHz |
| Slew Rate | 1.2 V/us |
| Supply Current Per Amplifier | 1.2 mA |
| 輸出類型 | Rail-to-Rail |
| Input Common-Mode | Ground sensing (includes ground) |
| 工作溫度範圍 | -40C to +125C |
| 封裝 | 8-SOIC (SOIC-8, 0.154 in, 3.90 mm width) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant, Lead Free |
ADA4522-2ARZ 腳位配置
| 腳位 1 | OUT A — Amplifier A output (rail-to-rail) |
| 腳位 2 | -IN A — Amplifier A inverting input |
| 腳位 3 | +IN A — Amplifier A noninverting input (ground sensing) |
| 腳位 4 | V- — Negative supply |
| 腳位 5 | +IN B — Amplifier B noninverting input (ground sensing) |
| 腳位 6 | -IN B — Amplifier B inverting input |
| 腳位 7 | OUT B — Amplifier B output (rail-to-rail) |
| 腳位 8 | V+ — Positive supply (up to 55 V) |
典型應用
ADA4522-2ARZ 適用於 6 應用s: Precision Data Acquisition, Thermocouple and RTD Signal Conditioning, Weigh Scales and Bridge Sensors, Battery Monitoring and BMS, Industrial Process Control (4-20 mA Loops), EMI-Harsh Instrumentation Front Ends.
Precision Data Acquisition
The ADA4522-2ARZ fits precision DAQ front ends because its 5 uV max offset and 22 nV/C drift eliminate calibration cost over a 10-year product life, while 5.8 nV/√Hz noise preserves resolution ahead of 16-24 bit ADCs such as the ADS1262. Used as an anti-aliasing or gain stage between a sensor and the ADC, its 2.7 MHz GBW supports gains up to 100 with adequate settling, and the ground-sensing input tolerates grounded sensor elements without level shifting.
推薦
Thermocouple and RTD Signal Conditioning
Thermocouple signals are tens of microvolts per degree C, so amplifier offset directly becomes measurement error: the ADA4522-2ARZ's 5 uV max offset equals roughly 0.2C on a Type K probe. Its 22 nV/C drift keeps field accuracy without recalibration, and 50 pA bias current avoids RTD excitation errors. The wide 55V supply also lets the front end ride a 24V industrial rail directly, with EMI-enhanced inputs rejecting drive and inverter noise common on factory floors.
推薦
Weigh Scales and Bridge Sensors
Load-cell bridges output millivolts full-scale, so the ADA4522-2ARZ's 117 nV p-p (0.1 Hz to 10 Hz) noise preserves resolution in the direct preamp stage, while zero drift keeps the zero point stable across shop-temperature swings. Two channels in one SOIC-8 enable an instrumentation-amplifier build from three op amps with a single matched quad layout, and the rail-to-rail output uses the full ADC input range for maximum dynamic range per bit.
推薦
Battery Monitoring and BMS
The ADA4522-2ARZ conditions cell-voltage and current-sense signals in battery management systems: 50 pA bias current prevents battery drain through sense dividers, and 5 uV offset translates to sub-0.05% error on a 10 mohm shunt at moderate currents. The 4.5V-55V input range covers 12V-48V battery stacks from the same rail, and the -40C to +125C rating suits under-hood and outdoor storage environments.
推薦
Industrial Process Control (4-20 mA Loops)
In 4-20 mA transmitters, the ADA4522-2ARZ's offset drift sets long-term loop accuracy: with 22 nV/C drift, a 0.1% class transmitter stays in specification without periodic calibration. The 55V supply tolerates loop compliance voltages up to typical 24-36V rails, and on-chip EMI filtering mitigates noise coupling from nearby drives and switching supplies. Its dual channels serve V-to-I conversion and sensing in one package, cutting board area.
推薦
EMI-Harsh Instrumentation Front Ends
The ADA4522-2ARZ integrates on-chip EMI filters specifically for environments with RF interference - inverters, RF welders, and wireless-equipped equipment - where conventional precision op amps rectify out-of-band signals into DC errors. Combined with 5 uV offset and rail-to-rail output, it enables compact analog front ends that pass industrial EMC immunity tests without external RF filters, reducing component count and board space in noise-contaminated installations.
推薦
推薦產品摘要
工程參考資料，適用於 ADA4522-2ARZ — 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 | ADA4522-2ARZ-R7 | OPA2187AIDR | OPA2192IDR | TLC2272ACD | AD8676ARZ |
|---|---|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same | SOIC-8 - same |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Max Offset Voltage | 5 uV | 5 uV | 15 uV | 25 uV | 380 uV | 125 uV |
| Max Offset Drift | 22 nV/C | 22 nV/C | 30 nV/C | 0.6 uV/C | 2 uV/C | 1.2 uV/C |
| Supply Voltage (max) | 55 V | 55 V | 36 V | 36 V | 16 V | 36 V |
| Voltage Noise Density | 5.8 nV/√Hz typ | 5.8 nV/√Hz | 8 nV/√Hz | 14 nV/√Hz | 50 nV/√Hz | 11 nV/√Hz |
| Gain-Bandwidth | 2.7 MHz | 2.7 MHz | 1 MHz | 5.5 MHz | 2.3 MHz | 3 MHz |
| EMI Enhancement | Yes (on-chip filters) | Yes | No | No | No | No |
| Amplifier Type | Zero-Drift (Chopper) | Zero-Drift | Zero-Drift (Chopper) | Precision (CMOS) | Rail-to-Rail CMOS | Precision (bipolar) |
主要差異化特點
- 5 uV max offset and 22 nV/C max drift (對比OPA2192IDR)
- 55V wide supply range with ground-sensing inputs (對比OPA2187AIDR)
- On-chip EMI filtering (對比AD8676ARZ)
設計說明
Place 0.1 uF ceramic bypass capacitors within 2 mm of the V+ (pin 8) and V- (pin 4) pins, plus a 10 uF bulk capacitor per supply rail. For 55V operation, use capacitors rated at 100V and verify PCB creepage/clearance for the supply spacing. The SOIC-8 exposed-lead layout is standard dual op-amp footprint, so upgrading from legacy precision duals requires no board change.
As a chopper amplifier, the ADA4522-2 clock modulates out-of-band input signals, producing intermodulation artifacts around the chopping frequency. For signals above roughly 10 kHz or with high-frequency content, add a simple RC low-pass (e.g., 1 kohm / 1 nF) at the input. Also match impedance at the two inputs so bias-current-induced errors cancel - 50 pA typical bias makes this easy.
Do not exceed 55V total supply or reverse the inputs beyond absolute maximum ratings; the wide supply range invites accidental over-voltage on 48V rails with transients. Inputs sense down to ground but not below V- - add series protection and clamp diodes when the input can go negative during faults. Choose the -R7 reel suffix for reflow assembly; the tube version is for prototyping.
合規資訊
RoHS compliant and lead-free per ADI product data; AEC-Q100 qualification not claimed for this part.
