ADA4897-1ARZ-RL7 - 1nV/√Hz Low Noise Op Amp | Analog Devices
MPN: ADA4897-1ARZ-RL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
Drop-in alternatives for ADA4897-1ARZ-RL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4897-1ARZ
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ADA4897-1ARZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
ADA4895-1ARZ-RL7
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ADA4897-1ARZ-RL7 Maximum Ratings & Electrical Characteristics
| 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 |
| Quiescent Current | 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 |
| Output Type | Rail-to-Rail |
| Package | 8-SOIC (0.154, 3.90mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | [DATA_NEEDED: Operating Temperature Range] |
| Input Offset Voltage | [DATA_NEEDED: Input Offset Voltage] |
| Input Bias Current | [DATA_NEEDED: Input Bias Current] |
| RoHS Status | Compliant |
ADA4897-1ARZ-RL7 Pin Configuration
| Pin 1 | OUT — Output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connect |
| Pin 6 | NC — No connect |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADA4897-1ARZ-RL7 is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ADA4897-1ARZ-RL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Ultra-low noise of 1 nV/√Hz (vs OPA837IDBVR)
- Higher bandwidth of 230 MHz (vs ADA4895-1ARZ-RL7)
- Lower power consumption (vs ADA4807-2ARMZ-RL7)
Design Notes
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.
Compliance Information
RoHS compliant per Analog Devices product page. Other compliance data not specified in provided sources.
