AD8676ARZ - Ultra Precision Dual Op Amp | Analog Devices
料号： AD8676ARZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.59 | $3.59 |
| 10 | $3.25 | $32.50 |
| 100 | $2.85 | $285.00 |
| 500 | $2.5 | $1,250.00 |
| 1,000 | $2.25 | $2,250.00 |
AD8676ARZ 概述
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 signal conditioning, filtering, and mathematical operations. The AD8676 belongs to the precision op amp category, which prioritizes low offset voltage, low drift, and low noise over raw bandwidth. In the hierarchy of amplifiers, it sits above general-purpose op amps and below specialized instrumentation amplifiers, offering a balance of performance and cost.
Key features of the AD8676ARZ include a 2.8 nV/√Hz voltage noise density, rail-to-rail output swing, and a wide supply range of ±2.5 V to ±18 V (or 5 V to 36 V single supply). The device operates over the extended industrial temperature range of -40°C to +125°C, making it suitable for harsh environments. Its low input bias current and high DC precision make it ideal for precision data acquisition and sensor interfaces.
Technically, the AD8676 uses a proprietary precision trimming technique to achieve its low offset and drift. The dual-channel configuration allows for compact designs in multi-channel systems. The rail-to-rail output stage maximizes dynamic range, which is essential for single-supply applications. The device also features excellent PSRR and CMRR, ensuring accurate performance in noisy environments.
Typical applications include precision instrumentation, medical devices such as ECG and EEG monitors, industrial process control, and high-resolution ADC drivers. The low noise and low drift make it particularly suited for thermocouple and strain gauge signal conditioning, where small signals must be amplified without introducing errors.
When designing with the AD8676ARZ, ensure proper decoupling of the power supply pins with 0.1 µF ceramic capacitors placed close to the device. For best noise performance, use a low-noise power supply and consider a guard ring around the input pins on the PCB to minimize leakage currents.
直接替换替代料： AD8676ARZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD8676ARZ （相同外形与封装尺寸） ——差异在于 Amplifier Type, Operating Temperature Range, Gain Bandwidth Product, Slew Rate, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
OPA2188
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD8628ARZ-REEL7
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.24 / 个
查看数据手册 →ADA4610-2ARZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.19 / 个
查看数据手册 →OPA1612
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD8676ARZ 最大额定值与电气特性
| Number of Channels | 2 |
| Supply Voltage Range | 5 V to 36 V (single), ±2.5 V to ±18 V (dual) |
| Voltage Noise Density | 2.8 nV/√Hz |
| Input Offset Voltage | 10 µV (max) |
| Input Offset Drift | 0.1 µV/°C |
| Input Bias Current | 0.5 nA (max) |
| Gain Bandwidth Product | 10 MHz |
| Slew Rate | 2.5 V/µs |
| Rail-to-Rail Output | Yes |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 8-SOIC (0.154", 3.90mm Width) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| MSL 等级 | 1 |
| Amplifier Type | Standard (General Purpose) |
AD8676ARZ 引脚配置
| 引脚 1 | OUT A — Output of amplifier A |
| 引脚 2 | -IN A — Inverting input of amplifier A |
| 引脚 3 | +IN A — Non-inverting input of amplifier A |
| 引脚 4 | V- — Negative supply voltage |
| 引脚 5 | +IN B — Non-inverting input of amplifier B |
| 引脚 6 | -IN B — Inverting input of amplifier B |
| 引脚 7 | OUT B — Output of amplifier B |
| 引脚 8 | V+ — Positive supply voltage |
典型应用
AD8676ARZ 适用于 6 应用s: Precision Instrumentation, Medical Devices, Industrial Process Control, Audio Signal Processing, Data Acquisition Systems, Sensor Signal Conditioning.
Precision Instrumentation
The AD8676ARZ's ultralow offset voltage (10 µV max) and low drift (0.1 µV/°C) make it ideal for precision instrumentation such as data acquisition systems and sensor signal conditioning. Its dual-channel configuration allows compact multi-channel designs, and the rail-to-rail output maximizes dynamic range in single-supply systems. The low noise (2.8 nV/√Hz) ensures accurate measurement of small signals, while the wide supply range (5 V to 36 V) accommodates various power rails. In a typical thermocouple amplifier circuit, the AD8676ARZ provides stable gain with minimal error, ensuring high measurement accuracy over temperature.
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Medical Devices
In medical devices such as ECG and EEG monitors, the AD8676ARZ provides the low noise and high precision required for biopotential signal amplification. Its 2.8 nV/√Hz noise density ensures that small physiological signals are not buried in noise, and the low input bias current (0.5 nA max) minimizes electrode offset errors. The dual-channel design is ideal for multi-lead monitoring, and the extended temperature range (-40°C to +125°C) ensures reliable operation in clinical environments. The rail-to-rail output allows direct interfacing with ADCs, simplifying the signal chain and reducing component count.
推荐
Industrial Process Control
The AD8676ARZ is well-suited for industrial process control applications such as PLC analog input modules and temperature controllers. Its wide supply voltage range (up to 36 V) allows direct operation from 24 V industrial buses, and the high CMRR and PSRR reject common-mode noise and power supply variations. The low offset drift ensures accurate measurement over the -40°C to +125°C temperature range, critical for outdoor or harsh factory environments. In a 4-20 mA loop transmitter, the AD8676ARZ can buffer the sensor signal with high accuracy, maintaining loop integrity and minimizing calibration requirements.
推荐
Audio Signal Processing
The AD8676ARZ's low voltage noise (2.8 nV/√Hz) and high bandwidth (10 MHz) make it suitable for high-quality audio signal processing, such as active filters and preamplifiers. The rail-to-rail output allows maximum signal swing, and the low distortion ensures faithful reproduction. In a phono preamp, the AD8676ARZ can amplify the low-level signal from a cartridge with minimal added noise, preserving the dynamic range of the recording. Its dual-channel configuration is ideal for stereo applications, reducing board space and cost compared to using two single op amps.
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Data Acquisition Systems
In data acquisition systems, the AD8676ARZ serves as a precision buffer or gain stage before an ADC. Its low noise and low offset ensure that the ADC's full resolution is utilized, and the rail-to-rail output allows the signal to span the ADC's input range. The wide bandwidth (10 MHz) supports high-speed sampling, while the low input bias current minimizes errors when driving high-impedance sources. In a multi-channel DAQ, the dual-channel AD8676ARZ can handle two channels per package, reducing component count and PCB area. The device's stability with capacitive loads makes it easy to interface with ADC input capacitors.
推荐
Sensor Signal Conditioning
The AD8676ARZ is ideal for conditioning signals from various sensors, including thermocouples, strain gauges, and photodiodes. Its low offset voltage and drift ensure accurate amplification of small DC signals, while the low noise preserves signal integrity. The rail-to-rail output allows direct interfacing with ADCs or microcontrollers, simplifying the design. In a strain gauge bridge amplifier, the AD8676ARZ can provide the necessary gain with high common-mode rejection, rejecting noise from the excitation voltage. The wide supply range and industrial temperature range make it suitable for harsh environments.
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推荐产品汇总
工程参考数据： AD8676ARZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD8676ARMZ | OPA2188 | AD8628ARZ-REEL7 | ADA4610-2ARZ | OPA1612 |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-MSOP | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices | Analog Devices | Texas Instruments |
| Voltage Noise Density | 2.8 nV/√Hz | 2.8 nV/√Hz | 8 nV/√Hz | 22 nV/√Hz | 7.3 nV/√Hz | 1.1 nV/√Hz |
| Input Offset Voltage | 10 µV max | 10 µV max | 25 µV max | 5 µV max | 50 µV max | 100 µV max |
| Gain Bandwidth Product | 10 MHz | 10 MHz | 2 MHz | 2.5 MHz | 16.3 MHz | 80 MHz |
| Supply Voltage Range | 5 V to 36 V | 5 V to 36 V | 4.5 V to 36 V | 2.7 V to 5.5 V | ±5 V to ±15 V | ±2.25 V to ±18 V |
| Rail-to-Rail Output | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +85°C |
关键差异点
- Ultralow voltage noise of 2.8 nV/√Hz （对比 OPA2188)
- Higher bandwidth of 10 MHz （对比 OPA2188)
- Lower input offset voltage of 10 µV （对比 ADA4610-2ARZ)
设计说明
For optimal performance, use a low-noise power supply and place 0.1 µF ceramic capacitors close to the V+ and V- pins. Additionally, a 10 µF tantalum capacitor in parallel can help filter low-frequency noise. The AD8676ARZ has a wide supply range, but ensure the supply voltage does not exceed the absolute maximum ratings to avoid damage.
To minimize leakage currents and noise pickup, use a guard ring around the input pins (pins 2, 3, 5, 6) on the PCB. Keep the input traces short and shielded from noisy digital signals. A ground plane under the device is recommended to reduce parasitic capacitance and improve stability.
Avoid driving highly capacitive loads directly, as this can cause instability. If a large load capacitor is necessary, add a small series resistor (e.g., 50 Ω) at the output. Also, ensure the input common-mode voltage stays within the specified range to prevent phase reversal or latch-up.
合规信息
RoHS compliant per distributor listings. No AEC-Q100 qualification indicated for this part.
