AD8674ARZ - Quad Precision Low Noise Op Amp | Analog Devices
MPN: AD8674ARZ ✓ Hoạt độngAD8674ARZ Tóm tắt
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog electronics, used in configurations such as inverting, non-inverting, differential, and instrumentation amplifiers. Op amps are essential in signal conditioning, filtering, and data acquisition systems, where they buffer, amplify, and shape analog signals. The AD8674 belongs to the precision op amp category, which prioritizes low offset voltage, low noise, and low drift over raw speed.
Key features of the AD8674ARZ include ultra-low input voltage noise of 2.8 nV/√Hz, low input bias current of 1.5 nA, and a typical offset voltage of 10 µV. The amplifier is stable with capacitive loads up to 1000 pF, making it robust for driving long cables or high-capacitance ADC inputs. It also features a high open-loop gain of 126 dB and a common-mode rejection ratio of 120 dB, ensuring accurate signal reproduction.
The AD8674 uses a bipolar process technology that achieves excellent DC precision without the need for chopping or auto-zeroing. This results in low noise and low power consumption, with a quiescent current of 2.5 mA per amplifier. The device operates over the industrial temperature range of -40°C to +125°C, making it suitable for harsh environments.
Typical applications include precision data acquisition systems, medical instrumentation, industrial process control, and active filters. The quad configuration saves board space and reduces cost compared to using four single op amps. The AD8674ARZ is a drop-in replacement for many industry-standard quad op amps, offering superior noise and offset performance.
When designing with the AD8674ARZ, ensure proper power supply decoupling with 0.1 µF ceramic capacitors close to the supply pins. The input common-mode range extends to the negative rail, but for best performance, keep inputs within the specified range. The output can swing within 1.5 V of the rails, so consider this when driving ADC inputs.
Bộ thay thế dễ dàng lắp đặt cho AD8674ARZ — 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 AD8674ARZ (cùng hình factor và footprint) — khác nhau ở Capacitive Load Stability, Input Bias Current, Supply Voltage Range, Input Offset Voltage, Package.
AD8674AR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD8674BRZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →OP4177ARZ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
OPA4277UA
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADA4077-4ARZ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD8674ARZ Tỷ lệ tối đa & tính chất điện
| Amplifier Type | General Purpose |
| Number of Circuits | 4 |
| Gain Bandwidth Product | 10 MHz |
| Slew Rate | 4 V/µs |
| Supply Voltage Range | ±5 V to ±15 V |
| Input Offset Voltage | 10 µV (typical) |
| Input Bias Current | 1.5 nA (typical) |
| Input Voltage Noise Density | 2.8 nV/√Hz |
| Open-Loop Gain | 126 dB |
| Common-Mode Rejection Ratio | 120 dB |
| Capacitive Load Stability | 1000 pF |
| Quiescent Current (per amp) | 2.5 mA |
| Khoảng nhiệt độ hoạt động | -40°C to +125°C |
| Hộp | 14-SOIC |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD8674ARZ
| Chân 1 | OUT A — Output of amplifier A |
| Chân 2 | -IN A — Inverting input of amplifier A |
| Chân 3 | +IN A — Non-inverting input of amplifier A |
| Chân 4 | V+ — Positive supply |
| Chân 5 | +IN B — Non-inverting input of amplifier B |
| Chân 6 | -IN B — Inverting input of amplifier B |
| Chân 7 | OUT B — Output of amplifier B |
| Chân 8 | OUT C — Output of amplifier C |
| Chân 9 | -IN C — Inverting input of amplifier C |
| Chân 10 | +IN C — Non-inverting input of amplifier C |
| Chân 11 | V- — Negative supply |
| Chân 12 | +IN D — Non-inverting input of amplifier D |
| Chân 13 | -IN D — Inverting input of amplifier D |
| Chân 14 | OUT D — Output of amplifier D |
Ứng dụng tiêu biểu
AD8674ARZ phù hợp cho 6 Áp dụngs: Precision Data Acquisition Systems, Medical Instrumentation, Industrial Process Control, Active Filters, Audio Signal Processing, Test and Measurement Equipment.
Precision Data Acquisition Systems
The AD8674ARZ's low noise (2.8 nV/√Hz) and low offset voltage (10 µV) make it ideal for signal conditioning in data acquisition systems. It can buffer and amplify sensor signals before ADC conversion, ensuring high accuracy. The quad configuration allows multiple channels to be processed in a single IC, reducing board space and cost. Its high open-loop gain (126 dB) and CMRR (120 dB) reject common-mode noise, improving system performance.
Được đề xuất
Medical Instrumentation
In medical devices like ECG and EEG monitors, the AD8674ARZ provides low-noise amplification of bio-potential signals. Its low input bias current (1.5 nA) minimizes loading on high-impedance electrodes, and its low offset voltage reduces baseline drift. The wide temperature range (-40°C to +125°C) ensures reliability in clinical environments. The quad package enables multi-channel monitoring in a compact form factor.
Được đề xuất
Industrial Process Control
The AD8674ARZ is well-suited for industrial process control loops, where it amplifies signals from sensors like thermocouples and RTDs. Its high CMRR (120 dB) rejects interference from motors and power lines, while its low noise ensures accurate measurement. The device operates from ±15V supplies, common in industrial systems, and its robust design handles harsh conditions. The quad configuration allows multiple control loops to be implemented efficiently.
Được đề xuất
Active Filters
The AD8674ARZ's 10 MHz bandwidth and 4 V/µs slew rate make it suitable for active filter designs, such as low-pass and band-pass filters in communication systems. Its low noise and distortion preserve signal quality, while its stability with capacitive loads allows direct driving of filter capacitors. The quad package enables multi-stage filters in a single IC, simplifying design and reducing component count.
Được đề xuất
Audio Signal Processing
In professional audio equipment, the AD8674ARZ provides low-noise amplification for mixing consoles and equalizers. Its 2.8 nV/√Hz noise floor is low enough for high-fidelity audio, and its low distortion ensures transparent signal reproduction. The device operates from ±15V supplies, typical in audio gear, and its quad configuration allows multiple audio channels to be processed in one IC, reducing cost and board space.
Được đề xuất
Test and Measurement Equipment
The AD8674ARZ is used in test and measurement instruments like oscilloscopes and multimeters, where precision and low noise are critical. Its high open-loop gain and low offset voltage ensure accurate signal measurement, while its wide bandwidth supports high-frequency signals. The quad configuration allows multiple measurement channels to be implemented compactly, and its industrial temperature range ensures reliable operation in lab and field environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD8674ARZ — 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 | AD8674AR | AD8674BRZ | OP4177ARZ | OPA4277UA | ADA4077-4ARZ |
|---|---|---|---|---|---|---|
| Package | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Gain Bandwidth Product | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 1 MHz | 3.9 MHz |
| Slew Rate | 4 V/µs | 4 V/µs | 4 V/µs | 2.5 V/µs | 0.8 V/µs | 1.2 V/µs |
| Input Offset Voltage (max) | 75 µV | 75 µV | 50 µV | 50 µV | 50 µV | 25 µV |
| Input Bias Current (max) | 2 nA | 2 nA | 2 nA | 2 nA | 2 nA | 1.5 nA |
| Voltage Noise Density | 2.8 nV/√Hz | 2.8 nV/√Hz | 2.8 nV/√Hz | 3.8 nV/√Hz | 8 nV/√Hz | 2.2 nV/√Hz |
Bảo phân biệt quan trọng
- Lower input voltage noise (2.8 nV/√Hz) compared to OP4177ARZ (3.8 nV/√Hz) (vsOP4177ARZ)
- Higher slew rate (4 V/µs) vs OPA4277UA (0.8 V/µs) (vsOPA4277UA)
- Wider bandwidth (10 MHz) vs ADA4077-4ARZ (3.9 MHz) (vsADA4077-4ARZ)
Ghi chú thiết kế
Use 0.1 µF ceramic capacitors close to each supply pin (V+ and V-) to decouple high-frequency noise. Additionally, a 10 µF tantalum capacitor on each supply rail can help maintain stability during transient load changes. Proper decoupling is critical for achieving the low noise performance specified in the datasheet.
For optimal noise performance, keep the input traces short and shielded from digital signals. Use a ground plane under the op amp to minimize parasitic capacitance and noise pickup. Avoid routing high-frequency digital lines near the input pins, as this can couple noise into the amplifier.
Do not exceed the absolute maximum supply voltage of ±18V. Also, ensure the input common-mode voltage stays within the specified range to avoid phase reversal. When driving capacitive loads, verify stability with the actual load capacitance, as the 1000 pF stability is typical but may vary with supply voltage and temperature.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free finish indicated by 'Z' suffix.
