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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc. ADA4895-2ARMZ

Name: ADA4895-2ARMZ
Brand: Analog Devices Inc.
SKU: ADA4895-2ARMZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADA4895-2ARMZ

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: ADA4895-2ARMZ.pdf

Description:: IC OPAMP VFB 2 CIRCUIT 10MSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ADA4895-2ARMZ from Analog Devices is a dual, rail-to-rail output, voltage-feedback operational amplifier optimized for low-noise, high-speed signal conditioning in precision analog front-ends. It delivers 1 nV/√Hz input voltage noise at 100 kHz, 236 MHz −3 dB bandwidth (G = +10), 943 V/µs slew rate, and 22 ns settling time to 0.1%, operating from ±1.5 V to ±5 V supplies. It serves as an ADC driver in ultrasound imaging systems and PLL loop filters.

For engineers reviewing the ADA4895-2ARMZ datasheet, ADA4895-2ARMZ pinout, ADA4895-2ARMZ application, or ADA4895-2ARMZ equivalent, this page provides verified specifications, validated dual-amplifier pin functions, real-world use cases in high-fidelity data acquisition, and confirmed alternative options with documented performance trade-offs.

Technical Context

The ADA4895-2ARMZ employs Analog Devices' proprietary SiGe XFCB3 process to achieve gain ≥ 10 stability without external compensation while maintaining ultra-low 1/f noise (2 nV/√Hz at 10 Hz) and high spurious-free dynamic range (−96 dBc SFDR at 100 kHz). Its architecture integrates bias current cancellation and rail-to-rail output stage capable of sourcing/sinking 116/111 mA.

Each amplifier features independent disable control (DISABLE1/DISABLE2), enabling power-gating in multi-channel systems. The device maintains stable small-signal response across supply voltages (±1.5 V to ±5 V) and temperature (−40°C to +125°C), with thermal resistance θ_JA = 210°C/W in its 10-lead MSOP package.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Noise	1 nV/√Hz at 100 kHz - enables high-resolution signal amplification before ADC sampling without degrading SNR.
−3 dB Bandwidth	236 MHz at G = +10 - supports wideband applications such as ultrasound receive chains and high-speed DAC buffering.
Slew Rate	943 V/µs - ensures faithful reproduction of fast transient signals up to ~100 MHz full-power bandwidth.
Settling Time	22 ns to 0.1% - meets timing requirements for 16-bit+ ADC drivers sampling at ≥20 MSPS.
Supply Range	±1.5 V to ±5 V (or +3 V to +10 V) - allows flexible integration into both low-voltage portable and industrial-grade systems.
Quiescent Current	3 mA per amplifier - balances speed and power efficiency for battery-sensitive or thermally constrained designs.
Output Swing	Rail-to-rail, ±4.97 V (±5 V supply, RL = 1 kΩ) - maximizes dynamic range and simplifies level-shifting circuitry.

Pinout & Package

The ADA4895-2ARMZ is housed in a 10-lead MSOP package (3.0 mm × 3.0 mm × 0.85 mm), rated for −40°C to +125°C operation. Thermal resistance θ_JA = 210°C/W on JEDEC 4-layer board.

Pin/Terminal	Circuit Role	Design Meaning
OUT1	Amplifier 1 output	Low-impedance, rail-to-rail buffered output; drives ADC inputs or capacitive loads ≤6 pF directly.
−IN1	Inverting input 1	Differential input node with 10 kΩ differential impedance; requires matched layout for optimal CMRR.
+IN1	Noninverting input 1	High-impedance (10 MΩ) input; used for unity-gain buffer or noninverting gain configurations.
−VS	Negative supply rail	Common negative supply connection for both amplifiers; must be decoupled locally with 0.1 µF ceramic capacitor.
DISABLE1	Amplifier 1 disable control	Active-low logic input; pulls amplifier 1 output to high-impedance state when < +VS − 2 V (e.g., −5 V).
+VS	Positive supply rail	Common positive supply connection; supports single-ended (3–10 V) or split-supply (±1.5–±5 V) operation.
OUT2	Amplifier 2 output	Independent output with identical drive capability and noise performance as OUT1.
−IN2	Inverting input 2	Second differential input pair; isolated from Channel 1 to minimize crosstalk (<−120 dB at 1 MHz).
+IN2	Noninverting input 2	Second high-Z input; enables dual-channel simultaneous sampling without inter-channel coupling.
DISABLE2	Amplifier 2 disable control	Independent enable/disable for Channel 2; allows asymmetric power management in multi-channel systems.

Key Features

Feature	Design Value
Ultra-low broadband noise	1 nV/√Hz at 100 kHz and 2 nV/√Hz at 10 Hz - preserves signal integrity in low-level sensor preamplification.
G ≥ 10 stability	No external compensation required for gains ≥10 - reduces BOM count and PCB area in fixed-gain stages.
Rail-to-rail output swing	±4.97 V output with ±5 V supply - eliminates need for level-shifting and increases effective ADC utilization.
Independent channel disable	Two dedicated DISABLE pins (DISABLE1/DISABLE2) - enables dynamic power scaling in multi-channel data acquisition.
Wide supply flexibility	Operates from ±1.5 V to ±5 V or +3 V to +10 V - supports both low-power portable and high-dynamic-range industrial systems.

Applications

Ultrasound Receive Amplifier	High-Speed ADC Driver
Use Scenario: Amplifying weak, wideband echo signals (1–15 MHz) from piezoelectric transducers in portable ultrasound machines. IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier with gain ≥10, driving 16-bit ADCs at 40–80 MSPS. Use Value: 1 nV/√Hz input noise and 236 MHz bandwidth preserve SNR and spatial resolution; rail-to-rail output maximizes ADC code usage.	Use Scenario: Buffering and driving the analog input of high-performance SAR ADCs (e.g., AD7985, AD7986) in data acquisition systems. IC Role / Device Role / Timing Role: High-fidelity, low-latency driver ensuring 22 ns settling to 0.1% before ADC conversion window. Use Value: 943 V/µs slew rate and 0.1% settling in 22 ns prevent aperture error and maintain ENOB >15 bits at 1 MSPS.
PLL Loop Filter	DAC Output Buffer
Use Scenario: Implementing active loop filters in RF synthesizers where phase noise and transient response critically impact spectral purity. IC Role / Device Role / Timing Role: Low-noise op-amp in third-order active filter topology, shaping loop dynamics and suppressing reference spurs. Use Value: 2 nV/√Hz 1/f noise minimizes close-in phase noise; high CMRR (>100 dB) rejects supply-induced jitter.	Use Scenario: Isolating and amplifying DAC outputs (e.g., AD5791) in precision instrumentation requiring glitch-free, monotonic response. IC Role / Device Role / Timing Role: Unity-gain stable buffer with rail-to-rail swing, absorbing DAC output impedance and charge kickback. Use Value: 3 mA quiescent current enables low-power buffering; 6 pF capacitive load drive stabilizes against DAC output capacitance.

Ultrasound Receive Amplifier

High-Speed ADC Driver

Use Scenario: Amplifying weak, wideband echo signals (1–15 MHz) from piezoelectric transducers in portable ultrasound machines.

IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier with gain ≥10, driving 16-bit ADCs at 40–80 MSPS.

Use Value: 1 nV/√Hz input noise and 236 MHz bandwidth preserve SNR and spatial resolution; rail-to-rail output maximizes ADC code usage.

Use Scenario: Buffering and driving the analog input of high-performance SAR ADCs (e.g., AD7985, AD7986) in data acquisition systems.

IC Role / Device Role / Timing Role: High-fidelity, low-latency driver ensuring 22 ns settling to 0.1% before ADC conversion window.

Use Value: 943 V/µs slew rate and 0.1% settling in 22 ns prevent aperture error and maintain ENOB >15 bits at 1 MSPS.

PLL Loop Filter

DAC Output Buffer

Use Scenario: Implementing active loop filters in RF synthesizers where phase noise and transient response critically impact spectral purity.

IC Role / Device Role / Timing Role: Low-noise op-amp in third-order active filter topology, shaping loop dynamics and suppressing reference spurs.

Use Value: 2 nV/√Hz 1/f noise minimizes close-in phase noise; high CMRR (>100 dB) rejects supply-induced jitter.

Use Scenario: Isolating and amplifying DAC outputs (e.g., AD5791) in precision instrumentation requiring glitch-free, monotonic response.

IC Role / Device Role / Timing Role: Unity-gain stable buffer with rail-to-rail swing, absorbing DAC output impedance and charge kickback.

Use Value: 3 mA quiescent current enables low-power buffering; 6 pF capacitive load drive stabilizes against DAC output capacitance.

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, high-speed op-amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADA4896-2	Same 1 nV/√Hz noise and 230 MHz bandwidth, but lower quiescent current (1.2 mA) and no disable function.	Lacks independent channel disable; unsuitable for power-gated multi-channel systems.	Select ADA4896-2 only if power budget is tighter and disable functionality is unnecessary.
AD8099	Lower 0.95 nV/√Hz noise, higher 510 MHz bandwidth, but higher 11.5 mA quiescent current and no rail-to-rail output.	Cannot swing to rails - requires level-shifting for ADC interfacing; higher thermal load limits density.	Choose AD8099 only when ultimate noise floor and bandwidth outweigh power and output swing constraints.

Compared with ADA4896-2 and AD8099, the ADA4895-2ARMZ uniquely combines sub-1.1 nV/√Hz noise, rail-to-rail output, dual-channel disable, and 3 mA power - making it optimal for space-constrained, multi-channel, battery-aware precision analog systems.

Availability

ADA4895-2ARMZ is available at Aetrix Electronics and suitable for ultrasound imaging systems, high-speed data acquisition, and PLL-based RF synthesizers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for ADA4895-2ARMZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADA4895 family was designed specifically for low-noise, high-speed signal conditioning in demanding applications including medical ultrasound, test equipment, and communications infrastructure - emphasizing noise, speed, and power efficiency without sacrificing DC precision.

FAQ

What is the minimum stable gain for the ADA4895-2ARMZ?

The ADA4895-2ARMZ is specified as gain ≥ 10 stable. It requires external compensation (e.g., feedback capacitor) for gains below +10 to ensure phase margin and prevent oscillation. This is explicitly stated in the General Description and Applications Information sections of the datasheet. Using the ADA4895-2ARMZ at G < +10 without compensation risks instability and degraded transient response.

Does the ADA4895-2ARMZ support single-supply operation?

Yes, the ADA4895-2ARMZ supports true single-supply operation from +3 V to +10 V. Its input common-mode range extends to −VS − 0.7 V and +VS + 0.7 V, and its rail-to-rail output swings within 130 mV of each rail under 1 kΩ load. For example, with +5 V supply, it delivers ±4.87 V output swing referenced to ground, enabling direct interface with unipolar ADCs.

What is the maximum capacitive load the ADA4895-2ARMZ can drive stably?

The ADA4895-2ARMZ is characterized for stable operation with up to 6 pF capacitive load at the output, producing ≤30% overshoot in step response. Driving larger capacitive loads (e.g., ADC input capacitance + PCB trace) requires isolation resistors or external compensation per Figure 54 in the datasheet. Exceeding 6 pF without mitigation risks peaking, ringing, or oscillation.

How does the disable function affect power consumption of the ADA4895-2ARMZ?

When disabled (DISABLE1 or DISABLE2 pulled < +VS − 2 V), the corresponding amplifier's quiescent current drops to 0.1 mA (at ±5 V) or 0.03 mA (at ±1.5 V), reducing total supply current by ~2.9 mA per channel. The output enters high-impedance state within 6 µs. This feature enables dynamic power scaling in multi-channel systems without external switches or routing changes.

Is the ADA4895-2ARMZ pin-compatible with other devices in the ADA489x family?

No, the ADA4895-2ARMZ is not pin-compatible with other dual variants like ADA4897-2 or ADA4896-2. Its 10-lead MSOP pinout (with dedicated DISABLE1/DISABLE2 pins) differs from the 8-lead SOIC of ADA4897-1 or the 10-lead MSOP of ADA4896-2 (which lacks disable pins). PCB layout must be specific to the ADA4895-2ARMZ footprint and pin assignments shown in Figure 7 and Table 9.

ADA4895-2ARMZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Packaging:: Tube

Product Status:: Active

Amplifier Type:: Voltage Feedback

Number of Circuits:: 2

Output Type:: Rail-to-Rail

Slew Rate:: 943V/µs

Gain Bandwidth Product:: 1.5 GHz

-3db Bandwidth:: 236 MHz

Current - Input Bias:: 11 µA

Voltage - Input Offset:: 53 µV

Current - Supply:: 3mA (x2 Channels)

Current - Output / Channel:: 116 mA

Voltage - Supply Span (Min):: 3 V

Voltage - Supply Span (Max):: 10 V

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-MSOP

ADA4895-2ARMZ FAQ

1.How can I place an order for ADA4895-2ARMZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ADA4895-2ARMZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADA4895-2ARMZ reliable?

The price and inventory of ADA4895-2ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4895-2ARMZ is usually 5 days.

3.What payment methods are accepted for ADA4895-2ARMZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4895-2ARMZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADA4895-2ARMZ?

ADA4895-2ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADA4895-2ARMZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADA4895-2ARMZ?

For technical support, including ADA4895-2ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4895-2ARMZ requirements.

6.How does Aetrix verify that ADA4895-2ARMZ is sourced from the original manufacturer or authorized distributors?

All ADA4895-2ARMZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADA4895-2ARMZ meets industry standards.

7.What is the process for return or replacement of ADA4895-2ARMZ?

All ADA4895-2ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4895-2ARMZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADA4895-2ARMZ part is unused and in its original packaging.

Return procedure for ADA4895-2ARMZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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