ADA4897-2ARMZ-RL7 - Dual 1nV/√Hz Low Noise Op Amp | Analog Devices
MPN： ADA4897-2ARMZ-RL7 ✓ 啟用中ADA4897-2ARMZ-RL7 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 signal processing, used in applications such as filtering, amplification, and signal conditioning. The ADA4897-2 belongs to the class of high-speed, low-noise op amps, which are essential in precision instrumentation and communication systems.
Key features include a voltage noise density of 1 nV/√Hz at 100 kHz, 1/f noise of 2.4 nV/√Hz at 10 Hz, and a spurious-free dynamic range (SFDR) of -80 dBc at 2 MHz. The amplifier provides a slew rate of 120 V/µs and a gain-bandwidth product of 230 MHz. It also features rail-to-rail output swing, enabling maximum dynamic range in low-voltage applications.
The ADA4897-2 uses a complementary bipolar process, achieving low distortion and high linearity. The device is fully specified over the extended industrial temperature range of -40°C to +125°C. Its low noise and high speed make it ideal for driving high-resolution ADCs, ultrasound front-ends, and low-noise signal chains.
Typical applications include ultrasound imaging, low-noise PLL loop filters, high-speed ADC drivers, and active filters. The dual configuration allows compact designs for stereo audio or multi-channel data acquisition. The rail-to-rail output ensures efficient use of the supply voltage, which is critical in battery-powered systems.
When designing with this amplifier, ensure proper power supply decoupling with 0.1 µF ceramic capacitors close to the supply pins. The thermal pad (if present) should be connected to a low-impedance ground plane for optimal thermal performance. The input common-mode range extends to the negative rail, but not to the positive rail, so level shifting may be required for single-supply applications.
直接替換替代品，適用於 ADA4897-2ARMZ-RL7 — 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： ADA4897-2ARMZ-RL7 （相同外形與佔位） — 差異在於 Package, Slew Rate, Supply Voltage Range, Gain Bandwidth Product, Input Voltage Noise Density.
ADA4897-2ARMZ-R7
✅ 直接替換📋 參考替代品（不在目錄中）
ADA4897-2ARMZ-RL
✅ 直接替換📋 參考替代品（不在目錄中）
ADA4897-2ARMZ
✅ 直接替換聯絡詢價
查看資料表 →ADA4896-2ARMZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4807-2ARMZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4897-2ARMZ-RL7 最大額定值與電氣特性
| Number of Channels | 2 |
| Amplifier Type | Voltage Feedback |
| 輸出類型 | Rail-to-Rail |
| Slew Rate | 120 V/µs |
| Gain Bandwidth Product | 230 MHz |
| Voltage Noise Density | 1 nV/√Hz at 100 kHz |
| 1/f Noise | 2.4 nV/√Hz at 10 Hz |
| Spurious-Free Dynamic Range | -80 dBc at 2 MHz |
| 靜態電流 | 3 mA per amplifier |
| Supply Voltage Range | 3 V to 10 V |
| 工作溫度範圍 | -40°C to +125°C |
| 封裝 | 10-MSOP |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead Free | Yes |
ADA4897-2ARMZ-RL7 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- — Negative supply voltage |
| 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 | V+ — Positive supply voltage |
| 腳位 9 | NC — No connect |
| 腳位 10 | NC — No connect |
典型應用
ADA4897-2ARMZ-RL7 適用於 6 應用s: Ultrasound Imaging, Low-Noise PLL Loop Filters, High-Speed ADC Drivers, Active Filters, Low-Noise Signal Conditioning, Communication Receivers.
Ultrasound Imaging
The ADA4897-2ARMZ-RL7's low noise (1 nV/√Hz) and high bandwidth (230 MHz) make it ideal for ultrasound front-end signal conditioning. It amplifies weak echo signals with minimal added noise, preserving image quality. The dual channel configuration supports multi-element transducers, and the rail-to-rail output maximizes dynamic range for subsequent ADC conversion.
推薦
Low-Noise PLL Loop Filters
In phase-locked loops, the ADA4897-2ARMZ-RL7 provides low-noise amplification of the loop filter output, reducing phase noise in the VCO control voltage. Its high slew rate and bandwidth ensure stable loop dynamics. The low 1/f noise (2.4 nV/√Hz at 10 Hz) is critical for close-in phase noise performance, making it suitable for high-frequency synthesizers.
推薦
High-Speed ADC Drivers
The ADA4897-2ARMZ-RL7 is well-suited for driving high-speed ADCs due to its low distortion and high slew rate. It can buffer and amplify signals before conversion, ensuring the ADC sees a clean, full-scale input. The rail-to-rail output helps maximize the ADC's dynamic range, and the low noise floor preserves signal integrity in communication receivers.
推薦
Active Filters
With a gain bandwidth product of 230 MHz, the ADA4897-2ARMZ-RL7 can implement high-frequency active filters with precise cutoff frequencies. Its low noise and low distortion make it suitable for anti-aliasing filters in data acquisition systems. The dual package allows compact multi-stage filter designs, and the rail-to-rail output supports single-supply operation.
推薦
Low-Noise Signal Conditioning
The ADA4897-2ARMZ-RL7 excels in low-noise signal conditioning for sensors and transducers. Its 1 nV/√Hz noise density ensures minimal signal degradation, while the high bandwidth preserves fast transients. The dual channel configuration is ideal for differential or multi-channel applications, and the wide supply range accommodates various system rails.
推薦
Communication Receivers
In communication receivers, the ADA4897-2ARMZ-RL7 provides low-noise amplification of IF or baseband signals. Its high SFDR (-80 dBc at 2 MHz) ensures low intermodulation distortion, preserving signal fidelity. The low power consumption (3 mA per amp) is advantageous for multi-channel receivers, and the small MSOP package saves board space.
推薦
推薦產品摘要
工程參考資料，適用於 ADA4897-2ARMZ-RL7 — 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 | ADA4897-2ARMZ-R7 | ADA4897-2ARMZ-RL | ADA4897-2ARMZ | ADA4896-2ARMZ | ADA4807-2ARMZ |
|---|---|---|---|---|---|---|
| Package | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP | 10-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Voltage Noise Density | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 1.6 nV/√Hz | 3.1 nV/√Hz |
| Gain Bandwidth Product | 230 MHz | 230 MHz | 230 MHz | 230 MHz | 120 MHz | 180 MHz |
| Slew Rate | 120 V/µs | 120 V/µs | 120 V/µs | 120 V/µs | 65 V/µs | 225 V/µs |
| Supply Voltage Range | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 2.7 V to 5 V |
| Quiescent Current per Amp | 3 mA | 3 mA | 3 mA | 3 mA | 3 mA | 1 mA |
| 1/f Noise at 10 Hz | 2.4 nV/√Hz | 2.4 nV/√Hz | 2.4 nV/√Hz | 2.4 nV/√Hz | 3.5 nV/√Hz | 7 nV/√Hz |
主要差異化特點
- Ultra-low voltage noise of 1 nV/√Hz (對比ADA4807-2ARMZ)
- Higher gain bandwidth product of 230 MHz (對比ADA4896-2ARMZ)
- Lower 1/f noise of 2.4 nV/√Hz at 10 Hz (對比ADA4807-2ARMZ)
設計說明
The ADA4897-2ARMZ-RL7 operates from 3V to 10V. Use a low-noise LDO regulator to supply the amplifier, as switching regulators can introduce noise. Decouple each supply pin with a 0.1µF ceramic capacitor placed as close as possible to the pin, and a 10µF tantalum capacitor for bulk decoupling.
For optimal noise performance, use a solid ground plane and minimize trace lengths. Keep feedback resistors small (e.g., 1kΩ) to reduce thermal noise. Place the amplifier close to the signal source and ADC to minimize parasitic capacitance. Use surface-mount components to reduce lead inductance.
The ADA4897-2ARMZ-RL7 in MSOP package has a thermal resistance of approximately 150°C/W. At maximum supply voltage (10V) and output current, power dissipation can be significant. Ensure adequate copper area on the PCB for heat sinking, especially in high-temperature environments.
合規資訊
RoHS compliant per distributor listings. AEC-Q100 not applicable for this commercial-grade part.
