ADA4897-1ARZ-RL7 - 1nV/√Hz Low Noise Op Amp | Analog Devices
MPN： ADA4897-1ARZ-RL7 ✓ 啟用中ADA4897-1ARZ-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 electronics, used in signal conditioning, filtering, and amplification. The ADA4897-1 is a voltage feedback amplifier, which offers high bandwidth and low distortion, making it suitable for high-speed signal processing.
Key features include ultra-low wideband noise of 1 nV/√Hz, low 1/f noise of 2.4 nV/√Hz at 10 Hz, and low distortion of -115 dBc at 100 kHz. The quiescent current is only 3 mA per amplifier, making it power-efficient. The rail-to-rail output stage allows maximum output swing, and the device is unity-gain stable, simplifying design.
The ADA4897-1 uses a complementary bipolar process, achieving excellent noise performance and high speed. The input offset voltage is low, and the device has a high open-loop gain, ensuring accurate signal amplification. The amplifier is designed to drive capacitive loads and provides a spurious-free dynamic range of -80 dBc at 2 MHz.
Typical applications include ultrasound, low noise PLLs, and high-speed instrumentation. The low noise and high bandwidth make it ideal for medical imaging, communications, and test equipment. The rail-to-rail output is beneficial in single-supply systems, and the low power consumption extends battery life in portable devices.
When designing with this amplifier, ensure proper power supply decoupling with 0.1 µF 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 close to the rails, but avoid heavy loads that may reduce output swing.
直接替換替代品，適用於 ADA4897-1ARZ-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： ADA4897-1ARZ-RL7 （相同外形與佔位） — 差異在於 Package, Slew Rate, Distortion, Gain Bandwidth Product.
ADA4897-1ARZ
✅ 直接替換聯絡詢價
查看資料表 →ADA4897-1ARZ-R7
✅ 直接替換📋 參考替代品（不在目錄中）
ADA4895-1ARZ-RL7
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADA4897-1ARZ-RL7 最大額定值與電氣特性
| Amplifier Type | Voltage Feedback |
| Number of Circuits | 1 |
| Gain Bandwidth Product | 230 MHz |
| Slew Rate | 120 V/µs |
| Supply Voltage Range | 3 V to 10 V |
| 靜態電流 | 3 mA per amplifier |
| Wideband Noise | 1 nV/√Hz |
| 1/f Noise | 2.4 nV/√Hz at 10 Hz |
| Distortion | -115 dBc at 100 kHz, VOUT 2 V p-p |
| Spurious-Free Dynamic Range | -80 dBc at 2 MHz |
| 輸出類型 | Rail-to-Rail |
| 封裝 | 8-SOIC (0.154, 3.90mm Width) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
ADA4897-1ARZ-RL7 腳位配置
| 腳位 1 | OUT — Output |
| 腳位 2 | -IN — Inverting input |
| 腳位 3 | +IN — Non-inverting input |
| 腳位 4 | V- — Negative supply |
| 腳位 5 | NC — No connect |
| 腳位 6 | NC — No connect |
| 腳位 7 | V+ — Positive supply |
| 腳位 8 | NC — No connect |
典型應用
ADA4897-1ARZ-RL7 適用於 6 應用s: Ultrasound Imaging, Low Noise PLL, High-Speed Instrumentation, Medical Imaging, Communications, Test and Measurement.
Ultrasound Imaging
The ADA4897-1ARZ-RL7's ultra-low noise (1 nV/√Hz) and high bandwidth (230 MHz) make it ideal for ultrasound signal conditioning. In an ultrasound receiver, the amplifier must amplify weak echoes from tissue without adding noise, preserving image quality. The low 1/f noise (2.4 nV/√Hz at 10 Hz) ensures excellent performance at low frequencies, while the high slew rate (120 V/µs) handles fast transients. The rail-to-rail output maximizes dynamic range, and the low power (3 mA) is beneficial in portable ultrasound devices. The amplifier can be used in the analog front-end, driving an ADC or a TGC (time-gain compensation) stage.
推薦
Low Noise PLL
In phase-locked loops (PLLs), the ADA4897-1ARZ-RL7 is used in the loop filter to amplify the phase detector output. Its low noise (1 nV/√Hz) minimizes phase noise in the output signal, which is critical for communication systems. The high bandwidth (230 MHz) supports fast loop settling, and the rail-to-rail output allows the loop filter to drive the VCO over a wide range. The low power consumption (3 mA) is advantageous in battery-powered devices. The amplifier's unity-gain stability simplifies loop filter design, and its low distortion (-115 dBc) ensures clean signal processing.
推薦
High-Speed Instrumentation
The ADA4897-1ARZ-RL7 is well-suited for high-speed instrumentation such as oscilloscope front-ends and data acquisition systems. Its 230 MHz bandwidth and 120 V/µs slew rate allow it to accurately amplify fast signals without distortion. The low noise (1 nV/√Hz) ensures high sensitivity, and the rail-to-rail output provides maximum signal swing. The amplifier can be used as a buffer or gain stage, and its low power (3 mA) is beneficial in multi-channel systems. The device's high SFDR (-80 dBc at 2 MHz) makes it suitable for applications requiring low spurious signals.
推薦
Medical Imaging
In medical imaging systems, the ADA4897-1ARZ-RL7 provides low-noise amplification for signals from sensors such as photodiodes or ultrasound transducers. Its 1 nV/√Hz noise floor is essential for detecting weak biological signals, and the high bandwidth (230 MHz) supports fast imaging. The low power (3 mA) is critical for portable and battery-operated devices. The rail-to-rail output allows direct interfacing with ADCs, and the low distortion ensures accurate signal reproduction. The amplifier's small 8-SOIC package is suitable for compact designs.
推薦
Communications
The ADA4897-1ARZ-RL7 is used in communication systems for signal conditioning in receivers and transmitters. Its high bandwidth (230 MHz) and low noise (1 nV/√Hz) make it ideal for IF amplification and filtering. The low distortion (-115 dBc) ensures minimal intermodulation products, and the rail-to-rail output allows direct connection to ADCs. The low power (3 mA) is beneficial in battery-powered devices. The amplifier's unity-gain stability simplifies design, and its high SFDR (-80 dBc at 2 MHz) is advantageous in multi-carrier systems.
推薦
Test and Measurement
In test and measurement equipment, the ADA4897-1ARZ-RL7 provides accurate signal amplification for oscilloscopes, spectrum analyzers, and signal generators. Its 230 MHz bandwidth and 120 V/µs slew rate ensure faithful reproduction of high-speed signals. The low noise (1 nV/√Hz) allows precise measurements of small signals, and the rail-to-rail output maximizes dynamic range. The low power (3 mA) is beneficial in portable instruments. The amplifier's high SFDR (-80 dBc at 2 MHz) is critical for distortion measurements, and its small package is suitable for dense PCB layouts.
推薦
推薦產品摘要
工程參考資料，適用於 ADA4897-1ARZ-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 | ADA4897-1ARZ | ADA4897-1ARZ-R7 | ADA4895-1ARZ-RL7 | ADA4807-2ARMZ-RL7 | OPA837IDBVR |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-MSOP | SOT-23-5 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Gain Bandwidth Product | 230 MHz | 230 MHz | 230 MHz | 130 MHz | 180 MHz | 50 MHz |
| Slew Rate | 120 V/µs | 120 V/µs | 120 V/µs | 60 V/µs | 225 V/µs | 105 V/µs |
| Supply Voltage Range | 3V to 10V | 3V to 10V | 3V to 10V | 3V to 10V | 2.7V to 5V | 2.7V to 5.4V |
| Quiescent Current | 3 mA | 3 mA | 3 mA | 3 mA | 1 mA | 0.35 mA |
| Wideband Noise | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 3.1 nV/√Hz | 4.6 nV/√Hz |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
主要差異化特點
- Ultra-low noise of 1 nV/√Hz (對比OPA837IDBVR)
- Higher bandwidth of 230 MHz (對比ADA4895-1ARZ-RL7)
- Lower power consumption (對比ADA4807-2ARMZ-RL7)
設計說明
Ensure proper power supply decoupling. Place a 0.1 µF ceramic capacitor close to each supply pin (V+ and V-) and a 10 µF tantalum capacitor at the power entry point. This minimizes supply noise and ensures stable operation at high frequencies.
Use a ground plane and keep the feedback network components close to the amplifier. Minimize trace lengths to reduce parasitic inductance and capacitance, which can cause instability. For best noise performance, use low-value resistors in the feedback network.
Avoid driving heavy capacitive loads directly, as this can cause ringing or oscillation. If a capacitive load is necessary, use a series resistor (e.g., 50 Ω) at the output. Also, ensure the input common-mode voltage stays within the specified range to avoid distortion.
合規資訊
RoHS compliant per Analog Devices product page. Other compliance data not specified in provided sources.
