AD8674BRZ - Precision Quad Op Amp, 10MHz | Analog Devices
MPN： AD8674BRZ ✓ 啟用中AD8674BRZ 概覽
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 instrumentation. The AD8674 is a quad op amp, meaning it contains four independent amplifiers in one package, saving board space and cost in multi-channel systems. It belongs to the family of precision amplifiers, which prioritize low offset, low noise, and high stability over raw speed.
Key features of the AD8674BRZ include a low input bias current of 1 nA (typical), a low offset voltage of 10 µV (typical), and a low noise density of 2.8 nV/√Hz. The device also offers a high open-loop gain of 126 dB and a slew rate of 2.5 V/µs. These specifications make it ideal for precision data acquisition, sensor conditioning, and active filtering. The rail-to-rail output stage allows maximum dynamic range in single-supply applications.
The AD8674 uses a precision bipolar process with laser-trimmed thin-film resistors, achieving excellent DC accuracy. The high open-loop gain and wide bandwidth enable high closed-loop gain configurations without significant gain error. The device is specified over the industrial temperature range of -40°C to +125°C, ensuring reliable operation in harsh environments.
Typical applications include precision instrumentation, medical devices, industrial process control, and audio signal processing. The low noise and low offset make it suitable for high-resolution ADC driver circuits, while the quad configuration is ideal for multi-channel data acquisition systems. The rail-to-rail output simplifies interface with ADCs and other mixed-signal devices.
When designing with the AD8674BRZ, ensure proper power supply decoupling with 0.1 µF ceramic capacitors close to the supply pins. The device is unity-gain stable, but for high-speed applications, consider the capacitive load stability. The SOIC-14 package provides good thermal performance for moderate power dissipation.
直接替換替代品，適用於 AD8674BRZ — 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： AD8674BRZ （相同外形與佔位） — 差異在於 Capacitive Load Stability, Input Bias Current, Package, Slew Rate, Supply Voltage Range.
AD8674ARZ
✅ 直接替換聯絡詢價
查看資料表 →AD8674ARZ-REEL
✅ 直接替換📋 參考替代品（不在目錄中）
OPA4277UA
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
OPA4227UA
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LT1114CN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD8674BRZ 最大額定值與電氣特性
| Number of Channels | 4 |
| Supply Voltage Range | ±2.5 V to ±18 V (dual), 5 V to 36 V (single) |
| Bandwidth | 10 MHz |
| Slew Rate | 2.5 V/µs |
| Input Offset Voltage | 10 µV (typical) |
| Input Bias Current | 1 nA (typical) |
| Voltage Noise Density | 2.8 nV/√Hz |
| Open-Loop Gain | 126 dB |
| 輸出類型 | Rail-to-Rail |
| Capacitive Load Stability | Stable with >1000 pF |
| 工作溫度範圍 | -40°C to +125°C |
| 封裝 | SOIC-14 |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
AD8674BRZ 腳位配置
| 腳位 1 | OUT A — Output of amplifier A |
| 腳位 2 | -IN A — Inverting input of amplifier A |
| 腳位 3 | +IN A — Non-inverting input of amplifier A |
| 腳位 4 | V+ — Positive supply |
| 腳位 5 | +IN B — Non-inverting input of amplifier B |
| 腳位 6 | -IN B — Inverting input of amplifier B |
| 腳位 7 | OUT B — Output of amplifier B |
| 腳位 8 | OUT C — Output of amplifier C |
| 腳位 9 | -IN C — Inverting input of amplifier C |
| 腳位 10 | +IN C — Non-inverting input of amplifier C |
| 腳位 11 | V- — Negative supply |
| 腳位 12 | +IN D — Non-inverting input of amplifier D |
| 腳位 13 | -IN D — Inverting input of amplifier D |
| 腳位 14 | OUT D — Output of amplifier D |
典型應用
AD8674BRZ 適用於 6 應用s: Precision Data Acquisition, Instrumentation Amplifiers, Active Filters, Medical Instrumentation, Industrial Process Control, Audio Signal Processing.
Precision Data Acquisition
The AD8674BRZ's low offset voltage (10 µV) and low noise (2.8 nV/√Hz) make it ideal for driving high-resolution ADCs in data acquisition systems. Its quad configuration allows simultaneous sampling of multiple channels, and the rail-to-rail output maximizes dynamic range. The wide bandwidth of 10 MHz ensures fast settling for multiplexed inputs.
推薦
Instrumentation Amplifiers
In precision instrumentation, the AD8674BRZ can be used to build three-op-amp instrumentation amplifiers with high common-mode rejection. Its low input bias current (1 nA) minimizes errors from source impedance, and the low offset drift ensures accuracy over temperature. The quad package allows multiple channels in a compact design.
推薦
Active Filters
The 10 MHz bandwidth and high open-loop gain (126 dB) of the AD8674BRZ make it suitable for active filters in signal conditioning. It can implement Butterworth, Chebyshev, or Bessel filters with precise cutoff frequencies. The low noise ensures minimal degradation of signal-to-noise ratio in the passband.
推薦
Medical Instrumentation
The AD8674BRZ is well-suited for medical devices such as ECG and EEG amplifiers, where low noise and low offset are critical for accurate biopotential measurement. Its low power consumption extends battery life in portable monitors. The wide temperature range supports sterilization and harsh environments.
推薦
Industrial Process Control
In industrial control systems, the AD8674BRZ provides precise signal conditioning for sensors like thermocouples and strain gauges. Its rail-to-rail output interfaces directly with ADCs and microcontrollers. The quad configuration reduces board space in multi-channel controllers, and the robust temperature range ensures reliability in factory environments.
推薦
Audio Signal Processing
The AD8674BRZ's low noise (2.8 nV/√Hz) and low distortion make it suitable for high-quality audio applications. It can be used in preamplifiers, equalizers, and active crossovers. The quad configuration allows stereo channels with additional stages, and the wide bandwidth preserves audio fidelity.
推薦
推薦產品摘要
工程參考資料，適用於 AD8674BRZ — 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 | AD8674ARZ | OPA4277UA | OPA4227UA |
|---|---|---|---|---|
| Package | SOIC-14 | SOIC-14 | SOIC-14 | SOIC-14 |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Number of Channels | 4 | 4 | 4 | 4 |
| Bandwidth | 10 MHz | 10 MHz | 1 MHz | 8 MHz |
| Input Offset Voltage | 10 µV | 10 µV | 10 µV | 10 µV |
| Voltage Noise Density | 2.8 nV/√Hz | 2.8 nV/√Hz | 8 nV/√Hz | 3 nV/√Hz |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | ±2 V to ±18 V | ±2.5 V to ±18 V |
| Operating Temperature Range | -40°C to +125°C | -40°C to +85°C | -40°C to +125°C | -40°C to +125°C |
主要差異化特點
- Higher bandwidth than OPA4277 (對比OPA4277UA)
- Lower noise than OPA4277 (對比OPA4277UA)
- Wider temperature range than AD8674ARZ (對比AD8674ARZ)
設計說明
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 with low-frequency transients. Proper decoupling is critical for maintaining the low noise performance of the AD8674BRZ.
For optimal performance, place the AD8674BRZ away from high-speed digital traces and use a ground plane to minimize noise pickup. Keep input traces short and shielded if necessary. The SOIC-14 package has a thermal pad? No, it does not, so ensure adequate copper area for heat dissipation if power dissipation is significant.
Avoid exceeding the absolute maximum supply voltage of ±18 V. Also, be cautious with capacitive loads: although the AD8674BRZ is stable with >1000 pF, larger loads may cause ringing. Use a series resistor if driving long cables. Additionally, the input common-mode range does not include the negative rail, so level-shift signals if needed.
合規資訊
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
