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Analog Devices Inc. ADA4084-1ARZ
- Part No.:
- ADA4084-1ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADA4084-1ARZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,018
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Product details
Overview
ADA4084-1ARZ from Analog Devices is a single-channel, rail-to-rail input/output precision operational amplifier optimized for low-noise, low-power, wide-supply applications. It delivers 15.9 MHz gain bandwidth, 4.6 V/µs slew rate, and 3.9 nV/√Hz voltage noise at 1 kHz, operating from ±1.5 V to ±15 V (or +3 V to +30 V). It is used in high-accuracy ADC input buffers and DAC output amplifiers where signal integrity and dc precision are critical.
For engineers reviewing the ADA4084-1ARZ datasheet, ADA4084-1ARZ pinout, ADA4084-1ARZ application, or ADA4084-1ARZ equivalent, this page provides verified specifications, SOIC-8 package mapping, real-world use cases in battery-powered instrumentation and power supply control, and validated alternative op amps with documented functional and parametric differences.
Technical Context
The ADA4084-1ARZ employs a folded-cascode input stage enabling rail-to-rail common-mode input range and high open-loop gain (>110 dB), while maintaining unity-gain stability and low distortion (0.003% THD+N at ±15 V). Its architecture supports precision dc performance with <100 µV max offset voltage and 0.5–1.75 µV/°C drift over −40°C to +125°C.
It features robust ESD protection (4.5 kV HBM), operates across industrial temperature range, and integrates internal compensation for stable operation with capacitive loads up to 100 pF. The device's low 0.625 mA typical supply current per amplifier enables use in portable systems without sacrificing bandwidth or noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±1.5 V to ±15 V (or +3 V to +30 V) - supports single- and dual-supply systems including industrial and battery-powered rails |
| Gain Bandwidth Product | 15.9 MHz typical - enables stable closed-loop designs up to ~14 MHz bandwidth at unity gain |
| Voltage Noise Density | 3.9 nV/√Hz at 1 kHz - ensures minimal added noise in sensor front-ends and precision signal chains |
| Input Offset Voltage | 100 µV maximum (SOIC package) - guarantees ≤0.1 mV error in 10 V full-scale measurement systems |
| Slew Rate | 4.6 V/µs typical (±15 V) - supports fast settling of 10 V step signals within 4 µs at 0.1% accuracy |
| Supply Current per Amplifier | 0.625 mA typical (±15 V) - enables dual-stage filtering in portable instruments with <1.3 mA total quiescent draw |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial control, and outdoor telecom equipment |
Pinout & Package
The ADA4084-1ARZ is supplied in an 8-lead SOIC_N (R-8) package with standard JEDEC footprint and exposed thermal pad not present (unlike LFCSP variants). Pin 1 is NC (not internally connected); pins 2 and 3 are inverting and non-inverting inputs; pin 4 is V−; pins 5–6 are NC; pin 7 is V+; pin 8 is OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NIC | No internal connection - no routing or grounding required; floating |
| 2 | −IN | Inverting input - accepts differential signal reference; rail-to-rail common-mode range (V− to V+) |
| 3 | +IN | Non-inverting input - same rail-to-rail CM range; matched bias current minimizes offset error |
| 4 | V− | Negative supply terminal - must be connected to system ground or negative rail; powers internal bias circuitry |
| 5 | NIC | No internal connection - unused; leave unconnected |
| 6 | OUT | Amplifier output - rail-to-rail swing (within 10–50 mV of rails depending on load) supports full dynamic range utilization |
| 7 | V+ | Positive supply terminal - supplies core amplifier and output stage; PSRR >110 dB suppresses supply ripple |
| 8 | NIC | No internal connection - unused; leave unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling in single-supply systems (e.g., 0–3.3 V microcontroller interfaces) without level-shifting circuitry |
| Low 3.9 nV/√Hz voltage noise | Preserves SNR in low-level transducer amplification (e.g., piezoelectric sensors, strain gauges) without requiring external filtering |
| Unity-gain stable | Eliminates need for external compensation components in buffer, gain-of-one, or active filter configurations |
| 0.625 mA supply current (±15 V) | Supports multi-amplifier signal chains in space-constrained, thermally sensitive applications such as handheld test equipment |
| −40°C to +125°C operation | Validated performance across extended industrial range - no derating needed in motor drives or power converters |
Applications
| Battery-Powered Instrumentation | High-Side and Low-Side Sensing |
|---|---|
Use Scenario: Portable multimeter front-end amplifying mV-level thermocouple or shunt voltage signals. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input enabling zero-volt referenced measurements and low-noise buffering before 24-bit sigma-delta ADC. Use Value: 100 µV max offset and 0.5 µV/°C drift ensure <0.01% measurement error over temperature without calibration; 3.9 nV/√Hz noise avoids degrading effective resolution. |
Use Scenario: Bidirectional current sensing in 12 V/24 V automotive power distribution modules. IC Role / Device Role / Timing Role: Differential amplifier configured for high-common-mode rejection (106 dB CMRR at ±14 V) to extract µV-level shunt voltage amid noisy supply rails. Use Value: Rail-to-rail output swings to near supply rails allow direct interfacing with 3.3 V SAR ADCs; PSRR >110 dB rejects coupled supply noise during load transients. |
| Power Supply Control and Protection | DAC Output Amplification |
Use Scenario: Voltage error amplifier in isolated DC-DC converter feedback loop regulating ±15 V outputs. IC Role / Device Role / Timing Role: High-gain, low-drift comparator-like amplifier driving optocoupler input with precise regulation setpoint tracking. Use Value: 117 dB large-signal voltage gain ensures <10 ppm regulation error; 15.9 MHz GBP supports phase margin >85° in compensated loops up to 500 kHz switching frequency. |
Use Scenario: Output buffer for 16-bit DAC generating programmable bias voltages in RF front-end calibration circuits. IC Role / Device Role / Timing Role: Unity-gain stable voltage follower minimizing code-dependent glitches and settling to 0.1% in 4 µs for 10 V steps. Use Value: 4.6 V/µs slew rate and 0.003% THD+N preserve DAC spectral purity; rail-to-rail output ensures full 0–5 V or ±2.5 V range utilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8671ARZ | Lower noise (2.8 nV/√Hz), higher supply current (2.1 mA), narrower supply range (±5 V to ±15 V only) | Better for ultra-low-noise audio or metrology; unsuitable for +3 V single-supply systems | Select AD8671ARZ when noise dominates budget and supply rails ≥±5 V; avoid for battery-powered 3 V designs. |
| ADA4004-1ARZ | Higher precision (12 µV max VOS), lower bandwidth (12 MHz), higher supply current (1.2 mA), same rail-to-rail I/O | Preferred for sub-µV offset-critical applications like precision weigh scales; trades speed for dc accuracy | Choose ADA4004-1ARZ when offset drift and long-term stability outweigh bandwidth needs; verify layout for 12 MHz stability. |
Compared with ADA4084-1ARZ, AD8671ARZ offers superior noise but lacks true 3 V operation and consumes >3× more current, while ADA4004-1ARZ achieves microvolt-level offset at the cost of 25% bandwidth reduction and higher quiescent power - making ADA4084-1ARZ the balanced choice for wide-supply, low-noise, moderate-speed instrumentation.
Availability
ADA4084-1ARZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-side/low-side current sensing, and DAC output amplification requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for ADA4084-1ARZ 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, with design centers worldwide and ISO 9001-certified manufacturing.
The ADA4084 family was designed specifically for precision, low-noise, wide-supply op amp applications in industrial, medical, and test equipment - emphasizing rail-to-rail operation, low distortion, and robust thermal performance from −40°C to +125°C.
FAQ
What is the maximum supply voltage rating for ADA4084-1ARZ?
The ADA4084-1ARZ has an absolute maximum supply voltage rating of ±18 V. It is fully specified and guaranteed to operate over ±1.5 V to ±15 V (or +3 V to +30 V) across the industrial temperature range. Operation beyond ±15 V is not characterized and may impact reliability or parametric performance.
Does ADA4084-1ARZ support rail-to-rail output swing with heavy loads?
Yes, ADA4084-1ARZ maintains rail-to-rail output swing down to 2 kΩ loads: at ±15 V supply, VOH ≥14.5 V and VOL ≤−14.8 V into 2 kΩ. Performance degrades slightly under heavier loads (e.g., 500 Ω), where swing reduces to ~±13.5 V - confirmed in Table 4 of the Rev. I datasheet.
Is ADA4084-1ARZ unity-gain stable, and what compensation is required?
Yes, ADA4084-1ARZ is internally compensated and unity-gain stable. No external compensation components are required for stable operation at gains ≥1. This is verified by 86° phase margin and monotonic step response in the datasheet's Typical Performance Characteristics section.
How does ADA4084-1ARZ perform in single-supply 3.3 V applications?
ADA4084-1ARZ operates down to +3 V total supply (V+ = 3.3 V, V− = 0 V). At 3 V, it delivers 15.4 MHz GBP, 2.6 V/µs slew rate, and 3.9 nV/√Hz noise. Input common-mode range includes ground, and output swings to within 100 mV of each rail - enabling direct interface with 3.3 V ADCs and microcontrollers.
What is the thermal resistance (θJA) of the ADA4084-1ARZ SOIC package?
The ADA4084-1ARZ in 8-lead SOIC_N (R-8) package has a junction-to-ambient thermal resistance (θJA) of 121°C/W when mounted on a standard 4-layer JEDEC PCB with zero airflow. This value assumes proper copper pour and thermal vias; actual board layout significantly impacts real-world thermal performance.
ADA4084-1ARZ 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:
- 4.6V/µs
- Gain Bandwidth Product:
- 15.9 MHz
- -3db Bandwidth:
- 13.9 MHz
- Current - Input Bias:
- 140 nA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 625µA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADA4084-1ARZ FAQ
1.How can I place an order for ADA4084-1ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4084-1ARZ 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 ADA4084-1ARZ reliable?
The price and inventory of ADA4084-1ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4084-1ARZ is usually 5 days.
3.What payment methods are accepted for ADA4084-1ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4084-1ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4084-1ARZ?
ADA4084-1ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4084-1ARZ 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 ADA4084-1ARZ?
For technical support, including ADA4084-1ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4084-1ARZ requirements.
6.How does Aetrix verify that ADA4084-1ARZ is sourced from the original manufacturer or authorized distributors?
All ADA4084-1ARZ 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 ADA4084-1ARZ meets industry standards.
7.What is the process for return or replacement of ADA4084-1ARZ?
All ADA4084-1ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4084-1ARZ, 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 ADA4084-1ARZ part is unused and in its original packaging.
Return procedure for ADA4084-1ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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