AD8676BRMZ - Dual Precision 36V Rail-to-Rail Op Amp | Analog Devices
MPN： AD8676BRMZ ✓ 啟用中AD8676BRMZ 概覽
A precision operational amplifier (op amp) is an analog integrated circuit that amplifies differential input voltages with very high DC accuracy, low offset, and low noise, serving as a foundational building block in instrumentation, signal conditioning, and active filtering. In the broader taxonomy, the AD8676 belongs to the op amp family within amplifier ICs, which in turn fall under the analog signal chain category of integrated circuits. Precision op amps are distinguished from general-purpose op amps by tight initial offset, low offset drift over temperature, low input bias current, and low broadband noise.
Key features of the AD8676 include a typical offset voltage of 12 µV, an offset drift of 0.5 µV/°C, and a gain bandwidth product of 10 MHz with a 2.5 V/µs slew rate. The amplifier delivers rail-to-rail output swing, low input bias current of 2 nA, and very low broadband voltage noise density. It is unity-gain stable, comes in industry-standard pinouts, and is specified across -40 °C to +125 °C operation. The 8-pin MSOP (RM) package makes it ideal for dense analog layouts.
The AD8676 uses a precision bipolar input stage combined with a rail-to-rail output stage, achieving both low noise and wide output swing in a single die. Its DC precision rivals chopper-stabilized amplifiers but without the chopping artifacts, while still providing wide bandwidth for AC-coupled signal paths.
Typical applications include precision instrumentation amplifiers, strain-gauge and thermocouple signal conditioning, high-impedance sensors, medical instrumentation, and professional audio line drivers. The combination of low noise and low bias current makes the AD8676 particularly suited to photodiode transimpedance front-ends and precision analog front ends for industrial control.
When designing with the AD8676, ensure that the input common-mode voltage stays within the specified range, that the output is not loaded below the rated minimum resistive load, and that decoupling capacitors are placed as close as possible to the supply pins to preserve PSRR and noise performance.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, providing a single decision-ready reference for engineers selecting a precision op amp for the 8-MSOP footprint.
直接替換替代品，適用於 AD8676BRMZ — 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： AD8676BRMZ （相同外形與佔位） — 差異在於 Amplifier Type, Gain Bandwidth Product, Operating Temperature Range, Package, Slew Rate.
AD8676ARZ
✅ 直接替換聯絡詢價
查看資料表 →AD8676BRZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD8676ARMZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD8676BRMZ-REEL
✅ 直接替換📋 參考替代品（不在目錄中）
AD8672ARZ
✅ 直接替換📋 參考替代品（不在目錄中）
AD8676BRMZ 最大額定值與電氣特性
| Number of Channels | 2 |
| Amplifier Type | Precision, General Purpose |
| 輸出類型 | Rail-to-Rail |
| Gain Bandwidth Product (GBP) | 10 MHz |
| Slew Rate (SR) | 2.5 V/us |
| Input Offset Voltage (Vos) | 12 uV (typical) |
| Input Offset Drift (dVos/dT) | 0.5 uV/C |
| Input Bias Current (Ib) | 2 nA |
| Voltage Noise Density (eN) | 2.8 nV/rtHz |
| Supply Voltage Range (single) | 5 V to 36 V |
| Supply Voltage Range (dual) | +/-2.5 V to +/-18 V |
| Quiescent Current (per channel) | 2.7 mA (typical) |
| 工作溫度範圍 | -40 C to +125 C |
| 封裝 | 8-MSOP (RM) |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 |
| RoHS 狀態 | Compliant |
AD8676BRMZ 腳位配置
| 腳位 1 | OUT A — Output of channel A |
| 腳位 2 | IN- A — Inverting input of channel A |
| 腳位 3 | IN+ A — Non-inverting input of channel A |
| 腳位 4 | V- — Negative supply voltage |
| 腳位 5 | IN+ B — Non-inverting input of channel B |
| 腳位 6 | IN- B — Inverting input of channel B |
| 腳位 7 | OUT B — Output of channel B |
| 腳位 8 | V+ — Positive supply voltage |
典型應用
AD8676BRMZ 適用於 6 應用s: Precision Instrumentation Amplifier Front End, Photodiode Transimpedance Amplifier, High-End Audio Line Driver and DAC Output Buffer, Strain Gauge and Load Cell Signal Conditioning, Thermocouple and RTD Temperature Sensing, Medical Instrumentation and Patient Monitoring.
Precision Instrumentation Amplifier Front End
The AD8676BRMZ's 12 uV input offset, 0.5 uV/C drift, and 2 nA input bias current make it an excellent precision input stage for instrumentation amplifiers in industrial measurement equipment. When configured as a three-op-amp IA front end, it preserves small thermocouple and strain-gauge signals over the full -40 C to +125 C temperature range. The 10 MHz GBP keeps AC accuracy high while the rail-to-rail output swing maximizes dynamic range on 5 V to 36 V supplies, common in 24 V industrial bus designs. Pair with the AD8421 for a complete precision signal chain.
推薦
Photodiode Transimpedance Amplifier
The AD8676BRMZ's 2.8 nV/rtHz voltage noise density and 2 nA input bias current suit it for transimpedance amplification of silicon photodiodes and PIN detectors in scientific instrumentation. The 10 MHz GBP supports wide-bandwidth optical receivers while the low input bias current minimizes DC error from photodiode leakage. Its rail-to-rail output enables direct ADC interfacing without level shifting. For pulse oximetry or LIDAR front ends, the part delivers low noise without the EMI susceptibility of chopper-stabilized alternatives.
推薦
High-End Audio Line Driver and DAC Output Buffer
The AD8676BRMZ delivers audio-grade performance with 2.8 nV/rtHz voltage noise and a 2.5 V/us slew rate sufficient for professional audio line drivers and DAC I/V output buffers. Its rail-to-rail output swing maximizes dynamic range on +/-15 V supplies commonly used in studio audio gear, while the low distortion preserves audio fidelity. Compared to general-purpose audio op amps, the AD8676 provides tighter DC offset for active crossover networks and balanced line transmitter designs.
推薦
Strain Gauge and Load Cell Signal Conditioning
For strain gauge and load cell signal conditioning, the AD8676BRMZ's 12 uV offset and 0.5 uV/C drift preserve low-frequency DC accuracy across wide temperature excursions in industrial weighing and force measurement systems. The 36 V supply tolerance supports 24 V industrial bus excitation rails. Used as a differential amplifier following the bridge, it rejects common-mode noise while the low bias current prevents loading of high-impedance sensors. Pair with the AD8421 for a complete bridge amplifier solution.
推薦
Thermocouple and RTD Temperature Sensing
The AD8676BRMZ is well suited to thermocouple and RTD temperature measurement front ends due to its 2 nA input bias current, 12 uV offset, and 0.5 uV/C drift. These characteristics translate small mV-level thermocouple signals into amplified voltages without corrupting DC accuracy across the -40 C to +125 C industrial range. The 36 V supply supports common 24 V industrial sensor excitation while the rail-to-rail output simplifies ADC interfacing. Use as a low-noise unity-gain buffer or in a precision gain stage for high-accuracy temperature transmitters.
推薦
Medical Instrumentation and Patient Monitoring
The AD8676BRMZ's combination of 2.8 nV/rtHz voltage noise and 2 nA input bias current makes it appropriate for ECG, EEG, and other patient-monitoring front ends where small biopotential signals must be amplified without DC drift or bias-current artifacts. The 36 V supply rating supports both portable battery-powered designs and line-powered bedside monitors. Compared to chopper-stabilized alternatives, the AD8676 avoids chopping artifacts that can interfere with sensitive medical measurements while delivering precision DC accuracy over the full industrial temperature range.
推薦
推薦產品摘要
工程參考資料，適用於 AD8676BRMZ — 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 | AD8676ARZ | AD8676BRZ | AD8676ARMZ | AD8676BRMZ-REEL | AD8672ARZ | AD8628ARZ |
|---|---|---|---|---|---|---|---|
| Package | 8-MSOP (RM-8) | 8-SOIC (R-8) - different footprint, larger | 8-SOIC (R-8) - different footprint, larger | 8-MSOP (RM-8) - same | 8-MSOP (RM-8) - same | 8-SOIC (R-8) - different footprint | 8-SOIC (R-8) - different footprint |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 (dual) | 2 | 2 | 2 | 2 | 2 | 2 |
| Supply Voltage Range | 5 V to 36 V (single) | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | 5 V to 36 V | +/-4.5 V to +/-18 V (narrower) | 2.7 V to 5 V (single), low-voltage |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Non-RRO | Rail-to-Rail |
| Gain Bandwidth Product | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 10 MHz | 2 MHz (lower BW) |
| Slew Rate | 2.5 V/us | 2.5 V/us | 2.5 V/us | 2.5 V/us | 2.5 V/us | 2.5 V/us | 1 V/us |
| Voltage Noise Density | 2.8 nV/rtHz | 2.8 nV/rtHz | 2.8 nV/rtHz | 2.8 nV/rtHz | 2.8 nV/rtHz | 2.8 nV/rtHz | 5 nV/rtHz (higher noise) |
| Input Offset Voltage | 12 uV (typical) | 12 uV | 12 uV | 12 uV | 12 uV | 10 uV (slightly better) | 1 uV (chopper-zero-drift) |
主要差異化特點
- Rail-to-rail output swing on a wide 36 V supply (對比AD8672ARZ)
- Higher bandwidth with equivalent precision noise (對比AD8628ARZ)
- Pin-compatible MSOP package for dense layouts (對比AD8676ARZ)
設計說明
Place 0.1 uF decoupling capacitors as close as possible to the V+ and V- supply pins of the AD8676BRMZ, ideally within 2 mm of the package. Add a 10 uF bulk capacitor at the supply entry point of the PCB. This preserves PSRR and minimizes noise injection through the supply rails. Keep input traces short and shield them from digital and switching signals to prevent coupling of noise into the precision input stage.
Estimated: with 2.8 nV/rtHz voltage noise and a 10 kHz noise bandwidth, the input-referred RMS noise is approximately 0.28 uVrms. For photodiode transimpedance designs, choose feedback resistor values that put this op amp noise below the sensor shot noise. Maintain phase margin by adding a small compensation capacitor across the feedback resistor in high-gain transimpedance stages.
Do not exceed the absolute maximum supply voltage of 36 V on the AD8676BRMZ - operation above this damages the device. Avoid reverse-driving the input pins outside the supply rails. For unity-gain buffer configurations, verify that the output is not loaded below the datasheet minimum resistive load, which can cause output stage instability. The MSOP exposed pad (if present) should be soldered to a grounded copper pour for thermal dissipation.
合規資訊
RoHS and REACH compliant per Analog Devices product page. Not AEC-Q100 qualified - this part targets industrial instrumentation rather than automotive. Lead-free reflow compatible with standard MSL1 floor life.
