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Analog Devices Inc. ADA4895-1ARZ
- Part No.:
- ADA4895-1ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADA4895-1ARZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:859
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Product details
Overview
ADA4895-1ARZ from Analog Devices is a single-channel, rail-to-rail output voltage feedback amplifier optimized for low-noise, high-speed signal conditioning in precision analog systems. It delivers 1 nV/√Hz input voltage noise at 100 kHz, 236 MHz −3 dB bandwidth (G = +10), 943 V/µs slew rate, and operates from 3 V to 10 V supply. It serves as an ADC driver in ultrasound front-ends and PLL loop filters where wide dynamic range and fast settling are critical.
For engineers reviewing the ADA4895-1ARZ datasheet, ADA4895-1ARZ pinout, ADA4895-1ARZ application, or ADA4895-1ARZ equivalent, this page provides verified specifications, SOIC-8 package terminal mapping, real-world use cases in high-performance data acquisition, and validated alternative options for gain ≥ 10 stable amplification.
Technical Context
The ADA4895-1ARZ uses Analog Devices' proprietary SiGe XFCB3 process to achieve gain ≥ 10 stability with ultra-low 1/f noise (2 nV/√Hz at 10 Hz) and high SFDR (−96 dBc at 100 kHz). Its architecture integrates bias current cancellation and rail-to-rail output stage capable of sourcing/sinking 116/111 mA while maintaining 22 ns 0.1% settling time.
It features a dedicated DISABLE pin enabling power-down mode (quiescent current drops to 0.1 mA), supports ±1.5 V to ±5 V dual supplies or +3 V to +10 V single supplies, and maintains full performance across −40°C to +125°C with thermal resistance θJA = 133°C/W in SOIC-8.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 1 nV/√Hz at 100 kHz - enables high-fidelity signal amplification without degrading SNR in sensitive sensor interfaces. |
| −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 2 V step with minimal distortion. |
| Settling Time | 22 ns to 0.1% - meets timing requirements for 10+ MSPS data converters requiring precise sampling window alignment. |
| Supply Range | 3 V to 10 V - allows flexible integration in both low-voltage portable systems and industrial 5 V/±5 V rails. |
| Quiescent Current | 3 mA per amplifier - balances speed and power efficiency for battery-aware or thermally constrained designs. |
| Disable Current | 0.1 mA when disabled - reduces system standby power in multi-amplifier configurations with dynamic channel gating. |
Pinout & Package
The ADA4895-1ARZ is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with exposed pad option not specified; standard JEDEC SOIC-8 footprint, 1.27 mm pitch, operating over −40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5 | No Connect (NC) | Unused pins - must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 2 | Inverting Input (−IN) | Differential input node; high impedance (10 MΩ common-mode) with 11 pF differential capacitance. |
| 3 | Noninverting Input (+IN) | Reference input node; matched to −IN for optimal CMRR (>100 dB) and low input offset drift. |
| 4 | Negative Supply (−VS) | Ground or negative rail connection; supports dual-supply operation down to −5 V or single-supply referenced ground. |
| 6 | Output (OUT) | Rail-to-rail output capable of driving 1 kΩ load to within 140 mV of rails at ±5 V supply. |
| 7 | Positive Supply (+VS) | Main power input; accepts 3 V to 10 V; PSRR >135 dB suppresses supply noise coupling into signal path. |
| 8 | Disable (DISABLE) | Active-low control pin; < +VS − 2 V disables amplifier, reducing IQ to 0.1 mA and increasing output impedance >1 kΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Gain ≥ 10 stability | Guarantees unconditional stability in noninverting configurations with closed-loop gains of +10 or higher without external compensation. |
| Rail-to-rail output swing | Delivers full-scale output voltage range (e.g., −4.97 V to +4.96 V on ±5 V rails), maximizing dynamic range into ADCs or downstream stages. |
| Low 1/f noise corner | 2 nV/√Hz at 10 Hz enables precision DC-coupled amplification in low-frequency medical and instrumentation applications. |
| Capacitive load drive | Stable with up to 6 pF capacitive load - simplifies PCB layout by tolerating trace capacitance and small filter caps without oscillation. |
| Wide temperature operation | Specified performance maintained from −40°C to +125°C - suitable for automotive under-hood and industrial motor control environments. |
Applications
| Ultrasound Receive Chain | High-Speed ADC Driver |
|---|---|
Use Scenario: Amplifying weak, wideband echo signals from piezoelectric transducers before digitization in portable or cart-based ultrasound systems. IC Role / Device Role / Timing Role: Low-noise preamplifier and anti-aliasing filter buffer with 236 MHz bandwidth and 22 ns settling to support 10–20 MSPS sampling. Use Value: 1 nV/√Hz noise floor preserves SNR of microvolt-level echoes; rail-to-rail output drives AD7986 (18-bit) without clipping. | Use Scenario: Driving the input of high-resolution SAR ADCs like AD7985 in automated test equipment requiring fast throughput and low harmonic distortion. IC Role / Device Role / Timing Role: High-fidelity buffer isolating ADC input from source impedance variations while delivering fast settling for accurate sample-and-hold capture. Use Value: −96 dBc SFDR at 100 kHz ensures clean spectral representation; 943 V/µs slew rate prevents slewing-induced distortion during full-scale transitions. |
| PLL Loop Filter | DAC Output Buffer |
Use Scenario: Implementing active loop filters in RF synthesizers where phase noise minimization and wide loop bandwidth are essential. IC Role / Device Role / Timing Role: Integrator and gain stage in third-order charge-pump PLL filters, providing low-noise error voltage correction with fast response. Use Value: Ultra-low 1/f noise avoids close-in phase noise degradation; 2 nV/√Hz at 10 Hz directly improves integrated jitter performance. | Use Scenario: Buffering high-speed DAC outputs (e.g., AD9767) in communication baseband modulators where output impedance matching and glitch energy suppression are critical. IC Role / Device Role / Timing Role: Low-output-impedance voltage follower that absorbs DAC current transients and maintains flat frequency response to 100 MHz. Use Value: 6 pF capacitive load tolerance allows direct connection to 50 Ω transmission lines; 22 ns settling ensures fidelity of multitone waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4896-2ARMZ | Dual-channel, same 1 nV/√Hz noise and 230 MHz bandwidth but lacks DISABLE pin and has different pinout (MSOP-10). | Not suitable for space-constrained single-amplifier layouts; requires redesign for disable functionality or SOIC footprint compatibility. | Select only if dual-channel integration and absence of disable control are acceptable. |
| AD8099ARDZ | Lower 0.95 nV/√Hz noise, higher 510 MHz bandwidth, but consumes 11.5 mA and requires ±5 V minimum supply. | Better for ultra-wideband RF IF stages; unsuitable for low-power or 3 V systems due to higher quiescent current and narrower supply range. | Choose when ultimate bandwidth/noise trade-off outweighs power and supply flexibility constraints. |
Compared with ADA4896-2ARMZ and AD8099ARDZ, the ADA4895-1ARZ uniquely balances sub-1.1 nV/√Hz noise, 236 MHz bandwidth, 3 mA power, and SOIC-8 disable capability-making it optimal for compact, power-aware, single-channel precision analog signal paths.
Availability
ADA4895-1ARZ is available at Aetrix Electronics and suitable for ultrasound imaging systems, high-speed data acquisition modules, and PLL-based frequency synthesis requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability.
Supply support for ADA4895-1ARZ 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 high-fidelity, wideband signal conditioning in medical imaging, test instrumentation, and communications infrastructure-emphasizing low noise, fast settling, and robust rail-to-rail operation.
FAQ
What is the maximum supply voltage rating for the ADA4895-1ARZ?
The ADA4895-1ARZ has an absolute maximum supply voltage rating of 11 V across +VS and −VS pins. Operation beyond this limit risks permanent damage. The recommended operating range is 3 V to 10 V, supporting both single-supply (e.g., +10 V) and dual-supply (e.g., ±5 V) configurations. Always observe common-mode input voltage limits (−VS − 0.7 V to +VS + 0.7 V) and differential input voltage limits (±0.7 V) per the datasheet.
Does the ADA4895-1ARZ require external compensation for stability at G = +10?
No, the ADA4895-1ARZ is explicitly gain ≥ 10 stable and does not require external compensation components when configured in noninverting mode with closed-loop gain of +10 or higher. Its internal architecture ensures unconditional stability across temperature and supply variations. For gains below +10, external feedback network adjustments may be needed per the "Using the ADA4895-1/ADA4895-2 at a Gain < +10" section of the datasheet.
What is the typical output voltage swing of the ADA4895-1ARZ on ±5 V supplies?
On ±5 V supplies, the ADA4895-1ARZ delivers a typical positive output swing of +4.96 V and negative output swing of −4.97 V into a 1 kΩ load, achieving true rail-to-rail performance within 30–40 mV of each rail. With a 100 Ω load, swing reduces to +4.77 V / −4.85 V. This wide linear output range maximizes dynamic headroom for driving high-resolution ADCs like the AD7986 without clipping.
How does the DISABLE pin function on the ADA4895-1ARZ?
The DISABLE pin (Pin 8) on the ADA4895-1ARZ is an active-low control that reduces quiescent current from 3 mA to 0.1 mA when pulled below +VS − 2 V. When enabled (> +VS − 0.5 V), full performance resumes within 0.25 µs. In disabled state, output impedance rises above 1 kΩ and output enters high-impedance state - ideal for multiplexed analog signal paths or power-gated channel architectures.
Is the ADA4895-1ARZ suitable for driving ADC inputs with 50 Ω termination?
Yes, the ADA4895-1ARZ can drive 50 Ω terminated ADC inputs when configured as a gain-of-two inverting amplifier or with appropriate series matching. Its linear output current capability is 80 mA rms, and short-circuit current is 116 mA sourcing / 111 mA sinking. For direct 50 Ω drive, ensure output voltage swing remains within safe limits (e.g., ≤ ±2.5 V) and verify stability with layout parasitics - the device tolerates up to 6 pF capacitive load without oscillation.
ADA4895-1ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 943V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 236 MHz
- Current - Input Bias:
- 11 µA
- Voltage - Input Offset:
- 53 µV
- Current - Supply:
- 3mA
- 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:
- 8-SOIC
ADA4895-1ARZ FAQ
1.How can I place an order for ADA4895-1ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4895-1ARZ 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 ADA4895-1ARZ reliable?
The price and inventory of ADA4895-1ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4895-1ARZ is usually 5 days.
3.What payment methods are accepted for ADA4895-1ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4895-1ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4895-1ARZ?
ADA4895-1ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4895-1ARZ 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 ADA4895-1ARZ?
For technical support, including ADA4895-1ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4895-1ARZ requirements.
6.How does Aetrix verify that ADA4895-1ARZ is sourced from the original manufacturer or authorized distributors?
All ADA4895-1ARZ 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 ADA4895-1ARZ meets industry standards.
7.What is the process for return or replacement of ADA4895-1ARZ?
All ADA4895-1ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4895-1ARZ, 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 ADA4895-1ARZ part is unused and in its original packaging.
Return procedure for ADA4895-1ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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