ADA4895-1ARZ - Low Noise, G≥10 Stable Op Amp | Analog Devices
MPN: ADA4895-1ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
ADA4895-1ARZ Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used in signal conditioning, filtering, and amplification circuits. The ADA4895-1 belongs to the class of high speed voltage feedback amplifiers, which are characterized by their wide bandwidth and fast slew rate, making them suitable for applications requiring high-frequency signal processing. Within the amplifier hierarchy, it sits between general-purpose op amps and specialized RF amplifiers, offering a balance of noise performance and speed.
Key features of the ADA4895-1ARZ include a 1/f noise of 2 nV/√Hz at 10 Hz, a spurious-free dynamic range (SFDR) of −72 dBc at 2 MHz, and a gain-bandwidth product of 235 MHz. The rail-to-rail output stage allows maximum output swing, and the low quiescent current of 3 mA makes it power-efficient for battery-powered designs. The device is stable for gains of 10 or greater, which simplifies compensation in non-inverting and inverting configurations.
Technically, the ADA4895-1 uses a voltage feedback architecture with a complementary bipolar process, achieving low input voltage noise and high linearity. The amplifier's input stage is optimized for low noise, while the output stage provides rail-to-rail swing with low distortion. The device also features a disable pin (on the SOT-23 version) for power saving, though the SOIC version does not include this feature.
Typical applications include ultrasound imaging, low noise preamplifiers, and active filters. In ultrasound systems, the low noise and high bandwidth enable accurate signal detection. In preamplifier circuits, the 2 nV/√Hz noise floor preserves weak signals. The rail-to-rail output is beneficial in single-supply applications where output swing is critical.
When designing with the ADA4895-1ARZ, ensure that the gain is set to at least 10 to maintain stability. Use proper decoupling capacitors on the power supply pins, and consider the thermal performance of the SOIC package in high-power applications. The device is RoHS compliant and lead-free.
Drop-in alternatives for ADA4895-1ARZ — 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 ADA4895-1ARZ (same form factor and footprint) — differing in Package, Slew Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4895-2ARZ
✓ In Stock
$2.19 / Unit
View Datasheet →ADA4895-1ARZ-RL7
✓ In Stock
$2.19 / Unit
View Datasheet →ADA4895-1AKSZ
📋 Reference alternative (not in catalog)
OPA837IDBVR
📋 Reference alternative (not in catalog)
ADA4899-1YCPZ
📋 Reference alternative (not in catalog)
ADA4895-1ARZ Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Supply Voltage Range | 3 V to 10 V |
| Supply Voltage Range (Dual) | ±1.5 V to ±5 V |
| Quiescent Current per Amplifier | 3 mA |
| Input Voltage Noise Density (1/f) | 2 nV/√Hz at 10 Hz |
| Spurious-Free Dynamic Range (SFDR) | -72 dBc at 2 MHz |
| Gain-Bandwidth Product | 235 MHz |
| Minimum Stable Gain | 10 |
| Output Type | Rail-to-Rail |
| Package | 8-Lead SOIC (SOIC-8) |
| Operating Temperature Range | -40°C to +125°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Amplifier Type | Voltage Feedback |
ADA4895-1ARZ 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 | V+ — Positive supply |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
Typical Applications
ADA4895-1ARZ is suitable for 6 applications: Ultrasound Imaging, Low Noise Preamplifiers, Active Filters, Medical Instrumentation, Communications, Test and Measurement.
Ultrasound Imaging
The ADA4895-1ARZ is ideal for ultrasound imaging systems due to its low input noise (2 nV/√Hz at 10 Hz) and high bandwidth (235 MHz). In the receive path, it amplifies weak echo signals from transducers with minimal added noise, preserving signal integrity. The rail-to-rail output allows full dynamic range, and the low quiescent current (3 mA) is beneficial for portable ultrasound devices. Its gain ≥ 10 stability is suitable for the high-gain stages required in these systems.
Recommended
Low Noise Preamplifiers
The ADA4895-1ARZ excels as a low noise preamplifier in applications such as sensor interfaces and audio equipment. Its 2 nV/√Hz input noise ensures that weak signals are amplified without significant noise contribution. The high bandwidth (235 MHz) supports fast signal processing, and the rail-to-rail output maximizes signal swing. The low quiescent current (3 mA) makes it suitable for battery-powered devices. The gain ≥ 10 stability is ideal for high-gain preamp stages.
Recommended
Active Filters
The ADA4895-1ARZ is well-suited for active filter designs, such as low-pass and high-pass filters, due to its high bandwidth and low noise. Its gain-bandwidth product of 235 MHz allows for high-frequency filter implementations. The rail-to-rail output ensures maximum signal swing, and the low quiescent current (3 mA) is efficient. The gain ≥ 10 stability is compatible with filter topologies that require high gain. It is commonly used in communication and instrumentation systems.
Recommended
Medical Instrumentation
In medical instrumentation, the ADA4895-1ARZ is used in ECG, EEG, and other biosignal amplification due to its low noise and high bandwidth. The 2 nV/√Hz noise floor is critical for detecting small physiological signals. The rail-to-rail output allows compatibility with ADCs, and the low quiescent current (3 mA) is ideal for portable monitors. The extended temperature range (-40°C to +125°C) ensures reliability in clinical environments.
Recommended
Communications
The ADA4895-1ARZ is used in communications systems for IF amplification and signal conditioning. Its high bandwidth (235 MHz) supports intermediate frequency processing, and the low noise (2 nV/√Hz) preserves signal quality. The rail-to-rail output is beneficial for driving ADCs, and the low quiescent current (3 mA) is suitable for power-sensitive transceivers. The gain ≥ 10 stability is appropriate for high-gain IF stages.
Recommended
Test and Measurement
In test and measurement equipment, the ADA4895-1ARZ is used in oscilloscope front ends, signal generators, and data acquisition systems. Its high bandwidth and low noise ensure accurate signal reproduction. The rail-to-rail output allows full-scale output swing, and the low quiescent current (3 mA) is efficient. The gain ≥ 10 stability is suitable for high-gain measurement circuits. The extended temperature range supports benchtop and field instruments.
Recommended
Recommended Products Summary
Engineering reference data for ADA4895-1ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4895-1ARZ-RL | ADA4895-1AKSZ | ADA4895-2ARZ | OPA837IDBVR |
|---|---|---|---|---|---|
| Package | 8-Lead SOIC | 8-Lead SOIC | 6-Lead SOT-23 | 10-Lead MSOP | SOT-23-5 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Channels | 1 | 1 | 1 | 2 | 1 |
| Supply Voltage Range | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 3 V to 10 V | 2.7 V to 5.4 V |
| Quiescent Current per Amplifier | 3 mA | 3 mA | 3 mA | 3 mA | 0.6 mA |
| Input Voltage Noise Density | 2 nV/√Hz at 10 Hz | 2 nV/√Hz at 10 Hz | 2 nV/√Hz at 10 Hz | 2 nV/√Hz at 10 Hz | 4.6 nV/√Hz at 10 Hz |
| Gain-Bandwidth Product | 235 MHz | 235 MHz | 235 MHz | 235 MHz | 50 MHz |
| Minimum Stable Gain | 10 | 10 | 10 | 10 | 1 |
Key Differentiators
- Lower input noise than OPA837 (vs OPA837IDBVR)
- Higher bandwidth than OPA837 (vs OPA837IDBVR)
- Lower quiescent current than ADA4899-1 (vs ADA4899-1YCPZ)
Design Notes
The ADA4895-1ARZ operates from 3 V to 10 V single supply or ±1.5 V to ±5 V dual supply. Ensure the supply voltage is within these limits to avoid damage. Use 0.1 µF ceramic capacitors close to the V+ and V- pins for decoupling, and a 10 µF tantalum capacitor for bulk decoupling. The quiescent current is 3 mA, so power dissipation is minimal, but consider thermal effects in high-temperature environments.
For optimal performance, place the ADA4895-1ARZ close to the signal source to minimize trace inductance. Use a ground plane to reduce noise and provide a low-impedance return path. Keep feedback resistors and capacitors close to the inverting input to minimize parasitic capacitance. The SOIC-8 package has a thermal pad (exposed pad) that should be soldered to the ground plane for improved thermal performance.
The ADA4895-1ARZ is stable for gains ≥ 10. Operating at lower gains may cause oscillation. Ensure the feedback network sets a gain of at least 10. Also, avoid capacitive loads greater than 100 pF directly on the output, as this can cause instability. Use a series resistor (e.g., 50 Ω) to isolate capacitive loads if necessary. Additionally, the input common-mode voltage should stay within the supply rails to prevent latch-up.
Compliance Information
RoHS compliant and lead-free per distributor listings. No AEC-Q100 qualification indicated for this part.
