ADA4897-1ARZ - 1nV/√Hz Low Noise Op Amp | Analog Devices
MPN: ADA4897-1ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
ADA4897-1ARZ Overview
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 applications ranging from signal conditioning to active filtering. The ADA4897-1 is a voltage feedback amplifier, a type of op amp that uses a voltage-controlled voltage source topology, offering high bandwidth and low distortion. It belongs to the family of high-speed amplifiers, which are optimized for fast settling and wide bandwidth, and is part of the broader category of linear integrated circuits.
Key features include a low input offset voltage of 0.5 mV (typical), a quiescent current of only 3 mA per amplifier, and a spurious-free dynamic range (SFDR) of -80 dBc at 2 MHz. The rail-to-rail output stage allows maximum output swing, and the device is unity-gain stable, simplifying design in buffer and follower configurations. The ADA4897-1 also offers low distortion of -115 dBc at 100 kHz with a 2 V p-p output, ensuring high signal fidelity.
Technically, the ADA4897-1 uses a complementary bipolar process that achieves its low noise and high speed. The amplifier's input stage is optimized for low voltage noise, while the output stage provides rail-to-rail swing with low output impedance. The device is specified over the industrial temperature range of -40°C to +125°C, and it is available in an 8-lead SOIC package (ARZ suffix), which is suitable for space-constrained designs.
Typical applications include low noise instrumentation, active filters, ADC drivers, and high-speed signal conditioning in test and measurement equipment. The low noise and high bandwidth make it particularly suited for medical imaging, communications, and industrial process control. In these applications, the ADA4897-1 ensures accurate signal reproduction with minimal added noise.
When designing with the ADA4897-1, pay attention to power supply decoupling: place a 0.1 µF ceramic capacitor close to each supply pin and a 10 µF tantalum capacitor at the supply rails. Also, consider the thermal performance, as the SOIC package has a limited power dissipation capability; ensure the junction temperature stays below 150°C.
Drop-in alternatives for ADA4897-1ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADA4897-1ARZ (same form factor and footprint) — differing in Package, Distortion, RoHS Status, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4895-1ARZ
✅ Drop-In✓ In Stock
$2.19 / Unit
View Datasheet →ADA4897-2ARZ
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OPA1612AIDR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.7911 / Unit
View Datasheet →AD8099ARZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADA4897-1ARZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Voltage Feedback |
| Number of Channels | 1 |
| Bandwidth (-3dB) | 230 MHz |
| Slew Rate | 120 V/µs |
| Supply Voltage Range | 3 V to 10 V |
| Quiescent Current | 3 mA per amplifier |
| Input Voltage Noise (wideband) | 1 nV/√Hz |
| Input Voltage Noise (1/f) | 2.4 nV/√Hz at 10 Hz |
| Input Offset Voltage | 0.5 mV (typical) |
| Spurious-Free Dynamic Range | -80 dBc at 2 MHz |
| Distortion | -115 dBc at 100 kHz, 2 V p-p |
| Output Type | Rail-to-Rail |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC (ARZ) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADA4897-1ARZ Pin Configuration
| Pin 1 | OUT — Amplifier output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC — No connect |
| Pin 6 | OUT — Amplifier output (duplicate) |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connect |
Typical Applications
ADA4897-1ARZ is suitable for 6 applications: Low Noise Instrumentation, Active Filters, ADC Driver, Medical Imaging, Communications, Test and Measurement.
Low Noise Instrumentation
The ADA4897-1ARZ's ultra-low voltage noise of 1 nV/√Hz and high bandwidth of 230 MHz make it ideal for precision instrumentation amplifiers. In a typical data acquisition front-end, the op amp buffers sensor signals with minimal added noise, preserving signal integrity. Its rail-to-rail output maximizes dynamic range, and the low quiescent current of 3 mA is suitable for portable instruments. The high slew rate of 120 V/µs ensures fast settling for multiplexed inputs. Recommended companion products include the AD7172-2BRUZ ADC and the ADR4520 voltage reference.
Recommended
Active Filters
The ADA4897-1ARZ is well-suited for active filter designs, such as low-pass and high-pass filters in communication systems. Its 230 MHz bandwidth allows for high-frequency filtering, while the low noise ensures a clean signal path. The unity-gain stability simplifies filter design, and the rail-to-rail output allows maximum signal swing. In a multiple-feedback topology, the op amp's high slew rate prevents distortion at high frequencies. The low offset voltage of 0.5 mV reduces DC errors. Recommended companion products include precision resistors and capacitors from YAGEO and Murata.
Recommended
ADC Driver
The ADA4897-1ARZ is an excellent choice for driving high-speed ADCs, such as the AD7172-2BRUZ. Its low noise and high bandwidth ensure that the ADC's performance is not degraded by the driver. The rail-to-rail output allows the ADC input to swing close to the supply rails, maximizing the dynamic range. The low distortion of -115 dBc at 100 kHz ensures accurate conversion. The op amp's high slew rate supports fast-settling signals. Recommended companion products include the AD7172-2BRUZ ADC and a low-jitter clock source.
Recommended
Medical Imaging
In medical imaging systems, such as ultrasound and MRI, the ADA4897-1ARZ provides the low noise and high bandwidth required for processing weak sensor signals. Its 1 nV/√Hz noise floor is critical for detecting small signals, and the 230 MHz bandwidth supports high-frequency ultrasound transducers. The low power consumption of 3 mA is beneficial for portable devices. The rail-to-rail output ensures compatibility with ADC inputs. The op amp's reliability over the industrial temperature range makes it suitable for medical equipment. Recommended companion products include the AD7172-2BRUZ ADC and the ADR4520 reference.
Recommended
Communications
The ADA4897-1ARZ is used in communication systems for signal conditioning in base stations and software-defined radios. Its high bandwidth and low noise are essential for processing RF and IF signals. The spurious-free dynamic range of -80 dBc at 2 MHz ensures low intermodulation distortion. The op amp's low power consumption is advantageous in power-sensitive designs. The rail-to-rail output allows direct interface to ADCs. Recommended companion products include the AD9361BBCZ transceiver and the ADCLK905 clock buffer.
Recommended
Test and Measurement
The ADA4897-1ARZ is ideal for test and measurement equipment, such as oscilloscopes and spectrum analyzers. Its high bandwidth and fast slew rate enable accurate reproduction of high-speed signals. The low noise ensures precise measurements, and the low offset voltage reduces DC errors. The op amp's unity-gain stability allows use in buffer and probe circuits. The rail-to-rail output maximizes the display range. Recommended companion products include the AD7172-2BRUZ ADC for digitization and the ADR4520 reference for calibration.
Recommended
Recommended Products Summary
Engineering reference data for ADA4897-1ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4895-1ARZ | OPA1612AIDR | AD8099ARZ |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Bandwidth | 230 MHz | 230 MHz | 80 MHz | 3.8 GHz |
| Slew Rate | 120 V/µs | 120 V/µs | 27 V/µs | 1350 V/µs |
| Input Voltage Noise | 1 nV/√Hz | 1.1 nV/√Hz | 1.1 nV/√Hz | 0.95 nV/√Hz |
| Quiescent Current | 3 mA | 1.5 mA | 3.6 mA | 15 mA |
| Supply Voltage Range | 3V to 10V | 3V to 10V | 4.5V to 36V | 5V to 12V |
| Output Type | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail | Rail-to-Rail |
Key Differentiators
- Ultra-low voltage noise of 1 nV/√Hz (vs ADA4895-1ARZ)
- Higher bandwidth of 230 MHz (vs OPA1612AIDR)
- Lower quiescent current of 3 mA (vs AD8099ARZ)
Design Notes
Ensure proper power supply decoupling. Place a 0.1 µF ceramic capacitor as close as possible to each supply pin (V+ and V-) and a 10 µF tantalum capacitor at the supply rails. This minimizes high-frequency noise and prevents oscillation, especially at high gains.
For optimal noise performance, use a ground plane and keep the input traces short and shielded. Avoid routing high-speed digital signals near the input pins. Use surface-mount components to reduce parasitic inductance. The SOIC package has a thermal pad; solder it to a copper pour for better heat dissipation.
Do not exceed the absolute maximum supply voltage of 12V. The input common-mode range extends to the rails, but avoid driving inputs beyond the rails to prevent latch-up. Also, ensure the load capacitance is within the specified range to maintain stability; for capacitive loads >100 pF, add a series resistor.
Compliance Information
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated for this part.
