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Analog Devices Inc. ADA4084-2ARZ
- Part No.:
- ADA4084-2ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADA4084-2ARZ.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
ADA4084-2ARZ from Analog Devices is a dual, rail-to-rail input/output, low-noise operational amplifier optimized for precision analog signal conditioning in single- and dual-supply systems. It delivers 15.9 MHz gain bandwidth, 4.6 V/µs slew rate, and 3.9 nV/√Hz voltage noise density at 1 kHz, with ±15 V operation and −40°C to +125°C industrial temperature range. It is used in high-side/low-side current sensing and ADC input buffering where dc accuracy and wide dynamic range are critical.
For engineers reviewing the ADA4084-2ARZ datasheet, ADA4084-2ARZ pinout, ADA4084-2ARZ application, or ADA4084-2ARZ equivalent, this page provides verified specifications, SOIC-8 package mapping, real-world use cases, and validated alternative options - all grounded in Analog Devices' Rev. I datasheet and official ordering guide.
Technical Context
The ADA4084-2ARZ employs a folded-cascode architecture enabling rail-to-rail input common-mode range (−15 V to +15 V at ±15 V supply) and rail-to-rail output swing (within 10 mV of rails at 10 kΩ load). Its unity-gain stability and 86° phase margin support robust closed-loop performance without external compensation.
It features matched input offset voltage drift (≤1.75 µV/°C), low long-term drift (3 µV typical over 10,000 hours), and integrated ESD protection (4.5 kV HBM). The device operates from ±1.5 V to ±15 V (or +3 V to +30 V single supply), with PSRR >110 dB and CMRR >106 dB across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±1.5 V to ±15 V - supports both low-voltage portable and high-voltage industrial rails without redesign. |
| Gain Bandwidth Product | 15.9 MHz - enables stable 10× gain up to ~1.6 MHz or unity-gain operation to 13.9 MHz (−3 dB BW). |
| Input Offset Voltage | 100 µV max (SOIC) - ensures ≤0.001% error in 10 V full-scale precision measurement paths. |
| Voltage Noise Density | 3.9 nV/√Hz @ 1 kHz - preserves SNR in sensor front-ends and DAC output stages. |
| Slew Rate | 4.6 V/µs - supports clean 10 VPP signals up to ~75 kHz without slewing distortion. |
| Quiescent Current | 0.625 mA per amplifier @ ±15 V - balances speed and power for battery-backed instrumentation. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom infrastructure. |
Pinout & Package
ADA4084-2ARZ is supplied in an 8-lead SOIC_N (R-8) package with standard JEDEC outline and exposed thermal pad not present (unlike LFCSP variants). Pin 1 is OUT A; pin 4 is V−; pin 5 is +IN B; pin 8 is V+. All pins are electrically defined per Table 10 of the datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads ≥2 kΩ; rail-to-rail swing supports direct interface to SAR ADC references. |
| 2 | −IN A | Inverting input for Channel A - matched to +IN A for <150 µV offset voltage matching between amplifiers. |
| 3 | +IN A | Non-inverting input for Channel A - accepts common-mode voltages from V− to V+; no phase reversal. |
| 4 | V− | Negative supply rail - must be decoupled locally; powers both amplifiers and internal bias circuitry. |
| 5 | +IN B | Non-inverting input for Channel B - independent of Channel A; enables dual-channel differential sensing. |
| 6 | −IN B | Inverting input for Channel B - matched to +IN B; supports tightly coupled dual-opamp topologies. |
| 7 | OUT B | Amplifier B output - identical AC/DC specs to OUT A; allows simultaneous signal conditioning paths. |
| 8 | V+ | Positive supply rail - requires low-ESR ceramic decoupling; PSRR >110 dB rejects supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-supply utilization in single-supply systems - e.g., 0–3.3 V microcontroller interfaces without level-shifting. |
| Low 3.9 nV/√Hz voltage noise | Minimizes added noise in low-level transducer amplification (e.g., piezoelectric sensors, strain gauges). |
| 15.9 MHz GBW with unity-gain stability | Permits wideband active filtering (e.g., 2nd-order anti-aliasing) without external compensation components. |
| 0.625 mA/amplifier quiescent current | Supports always-on monitoring circuits in energy-constrained applications like smart meters and IoT nodes. |
| −40°C to +125°C operation | Validated for deployment in motor control feedback loops and power supply monitoring without derating. |
Applications
| Battery-Powered Instrumentation | High-Side/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 accepting near-ground or near-rail common-mode voltages. Use Value: 100 µV max offset and 0.625 mA supply current extend battery life while maintaining 0.1% measurement accuracy. |
Use Scenario: Bidirectional current sensing in 12 V/48 V DC-DC converters using high-side and low-side shunts. IC Role / Device Role / Timing Role: Dual-channel difference amplifier - one channel for high-side (common-mode = VBUS), one for low-side (common-mode ≈ 0 V). Use Value: Matched offset drift (<1.75 µV/°C) ensures consistent gain error across temperature; rail-to-rail input handles 0–12 V common-mode range. |
| ADC Input Buffer | DAC Output Amplifier |
Use Scenario: Driving SAR ADC inputs (e.g., AD7980) requiring low THD+N and fast settling. IC Role / Device Role / Timing Role: Unity-gain buffer isolating RC filter from ADC sample capacitor; settles to 0.1% in 4 µs. Use Value: 4.6 V/µs slew rate and 13.9 MHz −3 dB bandwidth prevent distortion on 10 VPP, 100 kHz inputs. |
Use Scenario: Amplifying and level-shifting DAC outputs (e.g., AD5662) to ±10 V industrial control ranges. IC Role / Device Role / Timing Role: Precision inverting/non-inverting gain stage with low noise and minimal dc error. Use Value: 3.9 nV/√Hz noise preserves DAC's 16-bit ENOB; 100 µV offset contributes <0.0015% FSR error at ±10 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8676ARZ | Lower noise (2.8 nV/√Hz), higher supply current (2.3 mA/amplifier), no rail-to-rail input. | Better for ultra-low-noise audio or metrology; unsuitable for single-supply designs needing VCM = V−. | Select AD8676ARZ when noise dominates budget and rail-to-rail input is unnecessary. |
| ADA4625-2ARZ | Higher GBW (80 MHz), faster slew rate (30 V/µs), higher supply current (2.2 mA), same rail-to-rail I/O. | Better for wideband active filters or fast-settling data acquisition; overkill for dc-precision-only use. | Select ADA4625-2ARZ only if >20 MHz closed-loop bandwidth or sub-microsecond settling is required. |
Compared with ADA4084-2ARZ, AD8676ARZ trades rail-to-rail input capability for lower noise and higher power, while ADA4625-2ARZ significantly increases speed and current draw - making ADA4084-2ARZ the optimal balance of precision, bandwidth, and efficiency for industrial sensor signal chains.
Availability
ADA4084-2ARZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-side/low-side current sensing, and ADC/DAC interface applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for ADA4084-2ARZ 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 ADA4084 family was designed specifically for precision, low-noise, rail-to-rail op amp applications in industrial, instrumentation, and medical systems demanding wide supply range and robust dc performance.
FAQ
What supply voltage range does the ADA4084-2ARZ support?
The ADA4084-2ARZ operates from ±1.5 V to ±15 V (or +3 V to +30 V single supply), with full specification guaranteed across this range. At ±15 V, it delivers 15.9 MHz GBW and 4.6 V/µs slew rate; at ±1.5 V, it maintains rail-to-rail input/output and 1.5 MHz GBW - enabling flexible deployment from portable to industrial systems.
Is the ADA4084-2ARZ pin-compatible with other dual op amps in SOIC-8 packages?
No - the ADA4084-2ARZ uses a nonstandard SOIC-8 pinout (OUT A, −IN A, +IN A, V−, +IN B, −IN B, OUT B, V+) that differs from industry-standard dual op amps like the OP27 or AD8676. Direct replacement requires PCB layout revision; verify pin mapping before substitution.
What is the maximum input common-mode voltage for ADA4084-2ARZ at ±15 V supply?
At ±15 V supply, the ADA4084-2ARZ supports rail-to-rail input common-mode range: −15 V to +15 V. This allows direct connection to signals referenced to either supply rail - critical for high-side current sensing where VCM = VBUS ≈ +12 V in 12 V systems.
Does ADA4084-2ARZ require external compensation for unity-gain stability?
No - the ADA4084-2ARZ is internally compensated and unity-gain stable, with 86° phase margin at AV = 1. No external capacitors or resistors are needed for stable operation in buffers, followers, or gain-of-10 configurations up to its 13.9 MHz −3 dB bandwidth.
How does the ADA4084-2ARZ perform in low-power, battery-operated applications?
The ADA4084-2ARZ draws just 0.625 mA per amplifier at ±15 V, dropping to ~0.565 mA at ±5 V. Combined with rail-to-rail I/O and 100 µV max offset, it enables precision signal conditioning in always-on battery nodes - e.g., extending coin-cell life to >5 years in wireless sensor transmitters using ADA4084-2ARZ as ADC driver.
ADA4084-2ARZ 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:
- 2
- 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:
- 30 µV
- Current - Supply:
- 625µA (x2 Channels)
- 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
ADA4084-2ARZ FAQ
1.How can I place an order for ADA4084-2ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4084-2ARZ 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 ADA4084-2ARZ reliable?
The price and inventory of ADA4084-2ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4084-2ARZ is usually 5 days.
3.What payment methods are accepted for ADA4084-2ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4084-2ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4084-2ARZ?
ADA4084-2ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4084-2ARZ 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 ADA4084-2ARZ?
For technical support, including ADA4084-2ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4084-2ARZ requirements.
6.How does Aetrix verify that ADA4084-2ARZ is sourced from the original manufacturer or authorized distributors?
All ADA4084-2ARZ 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 ADA4084-2ARZ meets industry standards.
7.What is the process for return or replacement of ADA4084-2ARZ?
All ADA4084-2ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4084-2ARZ, 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 ADA4084-2ARZ part is unused and in its original packaging.
Return procedure for ADA4084-2ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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