ADA4896-2ARMZ - 1nV/√Hz Low Noise Dual Op Amp | Analog Devices
MPN: ADA4896-2ARMZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.5 | $3.50 |
| 10 | $3.15 | $31.50 |
| 100 | $2.8 | $280.00 |
| 500 | $2.5 | $1,250.00 |
| 1,000 | $2.25 | $2,250.00 |
ADA4896-2ARMZ Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output, used to perform mathematical operations like amplification, filtering, and signal conditioning. The ADA4896-2 is a voltage feedback op amp, a type that offers high input impedance and ease of use in inverting and non-inverting configurations. It belongs to the family of high-speed amplifiers, which are optimized for wide bandwidth and fast settling, essential in applications like ADC drivers, video processing, and active filters. As a rail-to-rail output amplifier, it can swing its output close to the supply rails, maximizing dynamic range in low-voltage systems.
Key features of the ADA4896-2ARMZ include an ultra-low voltage noise density of 1 nV/√Hz at 100 kHz and 2.4 nV/√Hz at 10 Hz (1/f noise), a spurious-free dynamic range (SFDR) of -80 dBc at 2 MHz, and a low input bias current of 1.5 µA. The amplifier also provides a high open-loop gain of 100 dB and a common-mode rejection ratio (CMRR) of 100 dB, ensuring accurate signal processing. Its rail-to-rail output stage can drive loads as low as 50 Ω, and it is fully specified over the industrial temperature range of -40°C to +125°C.
Technically, the ADA4896-2 uses a complementary bipolar process that achieves low noise without compromising speed or power. The amplifier's architecture includes a precision input stage that minimizes offset voltage (typically 0.5 mV) and drift, while the output stage provides high current drive capability. The device is designed for stable operation with capacitive loads up to 100 pF, and its internal compensation ensures unity-gain stability. The MSOP-8 package offers excellent thermal performance with a junction-to-ambient thermal resistance of 190°C/W, allowing operation in space-constrained designs.
Typical applications include low-noise ADC drivers, high-speed active filters, photodiode amplification, and medical instrumentation. In ADC driver circuits, the ADA4896-2's low noise and high SFDR preserve signal integrity, while its rail-to-rail output maximizes the ADC's input range. For photodiode transimpedance amplifiers, the low input bias current and low noise enable precise detection of weak optical signals. In medical devices like ECG and EEG monitors, the amplifier's low noise and low power consumption are critical for battery-operated, high-resolution signal acquisition.
When designing with the ADA4896-2ARMZ, ensure proper power supply decoupling with 0.1 µF ceramic capacitors placed close to the supply pins. The input common-mode voltage range extends to the negative rail, but for best performance, keep inputs within the specified range. The output can swing to within 50 mV of the rails, but for driving heavy loads, consider the output current capability. For optimal noise performance, use low-value resistors in the feedback network, as resistor noise can dominate.
Drop-in alternatives for ADA4896-2ARMZ — 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 ADA4896-2ARMZ (same form factor and footprint) — differing in Supply Voltage Range, Slew Rate, Package, Amplifier Type, Gain Bandwidth Product.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4897-2ARMZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →ADA4807-2ARMZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →ADA4806-2ARMZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.85 / Unit
View Datasheet →ADA4805-2ARMZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →ADA4666-2ARMZ-RL7
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
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View Datasheet →ADA4610-2ARMZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADA4896-2ARMZ Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Amplifier Type | Voltage Feedback |
| Output Type | Rail-to-Rail |
| Supply Voltage Range | 3 V to 10 V (single), ±1.5 V to ±5 V (dual) |
| Quiescent Current per Amplifier | 3 mA |
| Voltage Noise Density | 1 nV/√Hz at 100 kHz |
| 1/f Noise | 2.4 nV/√Hz at 10 Hz |
| Bandwidth | 230 MHz |
| Slew Rate | 120 V/µs |
| Spurious-Free Dynamic Range (SFDR) | -80 dBc at 2 MHz |
| Input Bias Current | 1.5 µA |
| Open-Loop Gain | 100 dB |
| Common-Mode Rejection Ratio (CMRR) | 100 dB |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-MSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADA4896-2ARMZ Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply voltage |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply voltage |
Typical Applications
ADA4896-2ARMZ is suitable for 6 applications: ADC Driver, Active Filter, Photodiode Amplifier, Medical Instrumentation, Video Amplification, Test and Measurement.
ADC Driver
The ADA4896-2ARMZ's low noise (1 nV/√Hz) and high SFDR (-80 dBc at 2 MHz) make it ideal for driving high-resolution ADCs. Its rail-to-rail output maximizes the ADC's input range, and the high bandwidth ensures fast settling. In a typical circuit, the amplifier is configured as a differential driver with a feedback network to match the ADC's input impedance. The low distortion preserves signal integrity, enabling high dynamic range in communication and instrumentation systems.
Recommended
Active Filter
The ADA4896-2ARMZ's high bandwidth (230 MHz) and low noise make it suitable for high-speed active filters, such as anti-aliasing filters in communication systems. Its unity-gain stability allows easy implementation of Sallen-Key or multiple feedback topologies. The low quiescent current (3 mA) is advantageous in multi-channel systems where power dissipation is a concern. The rail-to-rail output provides maximum signal swing, improving dynamic range in filter applications.
Recommended
Photodiode Amplifier
The ADA4896-2ARMZ's low input bias current (1.5 µA) and low voltage noise (1 nV/√Hz) are essential for transimpedance amplifiers used in photodiode detection. The high bandwidth supports fast optical signals, while the low noise ensures high sensitivity. In a typical circuit, the photodiode is connected to the inverting input with a feedback resistor to set the gain. The amplifier's low offset voltage minimizes DC errors, making it suitable for precision optical measurements.
Recommended
Medical Instrumentation
In medical devices like ECG and EEG monitors, the ADA4896-2ARMZ's low noise and low power consumption are critical. The low 1/f noise (2.4 nV/√Hz at 10 Hz) ensures accurate detection of biopotential signals, which are typically in the microvolt range. The rail-to-rail output allows operation from low supply voltages, extending battery life in portable monitors. The wide temperature range (-40°C to +125°C) ensures reliability in clinical environments.
Recommended
Video Amplification
The ADA4896-2ARMZ's high bandwidth (230 MHz) and slew rate (120 V/µs) make it suitable for video signal amplification in broadcast and surveillance systems. The low differential gain and phase errors ensure accurate color reproduction. The rail-to-rail output allows direct coupling to video DACs or ADCs. The low power consumption is beneficial in multi-channel video systems where heat dissipation is a concern.
Recommended
Test and Measurement
The ADA4896-2ARMZ's high accuracy and low noise make it ideal for test and measurement equipment, such as oscilloscope front-ends and signal generators. The high open-loop gain (100 dB) ensures precise amplification, while the low distortion preserves signal fidelity. The wide bandwidth supports high-frequency measurements. The compact MSOP package allows dense board layouts in multi-channel instruments.
Recommended
Recommended Products Summary
Engineering reference data for ADA4896-2ARMZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4897-2ARMZ | ADA4807-2ARMZ | ADA4806-2ARMZ |
|---|---|---|---|---|
| Package | 8-MSOP | 8-MSOP | 8-MSOP | 8-MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Channels | 2 | 2 | 2 | 2 |
| Bandwidth | 230 MHz | 230 MHz | 180 MHz | 100 MHz |
| Voltage Noise Density | 1 nV/√Hz | 1 nV/√Hz | 3.1 nV/√Hz | 4.5 nV/√Hz |
| Quiescent Current per Amplifier | 3 mA | 3 mA | 1 mA | 0.5 mA |
| Slew Rate | 120 V/µs | 120 V/µs | 225 V/µs | 50 V/µs |
| Supply Voltage Range | 3V to 10V | 3V to 10V | 2.7V to 12V | 2.7V to 12V |
Key Differentiators
- Ultra-low voltage noise of 1 nV/√Hz (vs ADA4807-2ARMZ)
- High bandwidth of 230 MHz (vs ADA4806-2ARMZ)
- Low quiescent current of 3 mA (vs ADA4897-2ARMZ)
Design Notes
Ensure proper power supply decoupling by placing 0.1 µF ceramic capacitors as close as possible to the V+ and V- pins. Additionally, use a 10 µF tantalum capacitor in parallel for low-frequency decoupling. This minimizes power supply noise and ensures stable operation, especially at high frequencies.
For optimal noise performance, use low-value resistors in the feedback network, as resistor noise can dominate. Keep the feedback loop short and use ground planes to minimize parasitic inductance. The MSOP package has a thermal resistance of 190°C/W, so ensure adequate copper area for heat dissipation if driving heavy loads.
Avoid exceeding the absolute maximum supply voltage of 12V. The input common-mode voltage should not exceed the supply rails. For capacitive loads greater than 100 pF, add a series resistor to isolate the output. Also, ensure the output does not short-circuit for extended periods, as this can cause thermal shutdown.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
