ADA4522-2ARZ - Dual 55V Zero-Drift Op Amp | Analog Devices
MPN: ADA4522-2ARZ ✓ Hoạt độngADA4522-2ARZ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ADA4522-2ARZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADA4522-2ARZ (cùng hình factor và footprint) — khác nhau ở Package, Input Bias Current, Slew Rate, Amplifier Type, Gain Bandwidth Product.
ADA4522-2ARZ-R7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
OPA2187AIDR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
OPA2192IDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TLC2272ACD
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD8676ARZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADA4522-2ARZ Tỷ lệ tối đa & tính chất điện
| Amplifier Type | Zero-Drift (Chopper), EMI Enhanced |
| Kênh | 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 |
| Kiểu đầu ra | Rail-to-Rail |
| Input Common-Mode | Ground sensing (includes ground) |
| Khoảng nhiệt độ hoạt động | -40C to +125C |
| Hộp | 8-SOIC (SOIC-8, 0.154 in, 3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant, Lead Free |
Cấu hình chân ADA4522-2ARZ
| Chân 1 | OUT A — Amplifier A output (rail-to-rail) |
| Chân 2 | -IN A — Amplifier A inverting input |
| Chân 3 | +IN A — Amplifier A noninverting input (ground sensing) |
| Chân 4 | V- — Negative supply |
| Chân 5 | +IN B — Amplifier B noninverting input (ground sensing) |
| Chân 6 | -IN B — Amplifier B inverting input |
| Chân 7 | OUT B — Amplifier B output (rail-to-rail) |
| Chân 8 | V+ — Positive supply (up to 55 V) |
Ứng dụng tiêu biểu
ADA4522-2ARZ phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADA4522-2ARZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- 5 uV max offset and 22 nV/C max drift (vsOPA2192IDR)
- 55V wide supply range with ground-sensing inputs (vsOPA2187AIDR)
- On-chip EMI filtering (vsAD8676ARZ)
Ghi chú thiết kế
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.
Thông tin tuân thủ
RoHS compliant and lead-free per ADI product data; AEC-Q100 qualification not claimed for this part.
