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

Analog Devices Inc. ADA4084-4ARUZ-RL

Name: ADA4084-4ARUZ-RL
Brand: Analog Devices Inc.
SKU: ADA4084-4ARUZ-RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADA4084-4ARUZ-RL

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: ADA4084-4ARUZ-RL.pdf

Description:: IC OPAMP GP 4 CIRCUIT 14TSSOP

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Product details

Overview

ADA4084-4ARUZ-RL from Analog Devices is a quad, rail-to-rail input/output, low-noise operational amplifier optimized for precision DC and wideband AC performance in single- or dual-supply systems. It delivers 3.9 nV/√Hz voltage noise at 1 kHz, 15.9 MHz gain bandwidth product, 4.6 V/µs slew rate (±15 V), and operates from ±1.5 V to ±15 V (or +3 V to +30 V). It is specified over −40°C to +125°C and used in high-side/low-side current sensing and ADC input buffering.

For engineers reviewing the ADA4084-4ARUZ-RL datasheet, ADA4084-4ARUZ-RL pinout, ADA4084-4ARUZ-RL application, or ADA4084-4ARUZ-RL equivalent, this page provides verified package mapping (14-lead TSSOP), confirmed quad-channel pin functions, industrial temperature range validation, rail-to-rail I/O behavior under real supply conditions, and two validated alternative op amps with documented parameter differences.

Technical Context

The ADA4084-4ARUZ-RL implements a folded-cascode input stage enabling rail-to-rail common-mode input range and high open-loop gain (>110 dB at ±15 V). Its output stage uses complementary bipolar architecture to achieve rail-to-rail swing with <30 mV low-output saturation at ±15 V and 2 kΩ load.

It features unity-gain stability, 86° phase margin, and low 0.55 pA/√Hz current noise-critical for high-impedance sensor interfaces. The device maintains 13.9 MHz −3 dB closed-loop bandwidth at AV = 1 and 0.003% THD+N at 1 kHz with 5 Vrms output into 2 kΩ.

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-supply battery-powered and dual-supply industrial systems without level-shifting.
Gain Bandwidth Product	15.9 MHz typical (±15 V): enables stable 10× gain up to ~1.6 MHz or unity-gain operation to 13.9 MHz.
Voltage Noise Density	3.9 nV/√Hz at 1 kHz: ensures minimal added noise in precision signal chains, e.g., thermocouple or strain gauge amplification.
Input Offset Voltage	100 µV max (SOIC/TSSOP, 25°C): guarantees ≤0.5 mV error in 5 V full-scale 12-bit systems without trimming.
Slew Rate	4.6 V/µs typical (±15 V): supports 10 Vpp signals up to ~750 kHz without slewing distortion.
Quiescent Current	0.75 mA per amplifier max (±15 V, 125°C): enables four-channel operation below 3 mA total in power-constrained designs.
Operating Temperature	−40°C to +125°C: qualified for automotive engine control, industrial motor drives, and outdoor instrumentation.

Pinout & Package

ADA4084-4ARUZ-RL is packaged in a 14-lead TSSOP (RU-14) with exposed pad (not electrically connected). Thermal resistance θJA = 112°C/W on 4-layer JEDEC board. Pin 11 is V−; pins 1, 7, 8, and 14 are outputs; all inputs are differential and rail-to-rail capable.

Pin/Terminal	Circuit Role	Design Meaning
1	OUT A	Amplifier A output; drives loads down to 2 kΩ while maintaining rail-to-rail swing.
2	−IN A	Inverting input for Channel A; matched to +IN A for <200 µV offset voltage matching (25°C).
3	+IN A	Non-inverting input for Channel A; accepts common-mode voltages from V− to V+.
4	V+	Positive supply rail; must be decoupled with ≥0.1 µF ceramic capacitor near pin.
5	+IN B	Non-inverting input for Channel B; independent of Channel A, enabling multi-channel filtering.
6	−IN B	Inverting input for Channel B; shares same input bias current spec (250 nA typ) as Channel A.
7	OUT B	Amplifier B output; identical AC/DC specs to OUT A; no crosstalk degradation up to 10 MHz.
8	OUT C	Amplifier C output; fully buffered-no shared internal nodes with A or B channels.
9	−IN C	Inverting input for Channel C; supports high-Z sensor interfaces with 0.55 pA/√Hz current noise.
10	+IN C	Non-inverting input for Channel C; rail-to-rail input enables direct connection to resistive transducers.
11	V−	Negative supply rail; connects to PCB ground plane or negative rail; exposed pad tied to V− in LFCSP variants (not applicable here).
12	+IN D	Non-inverting input for Channel D; allows simultaneous conditioning of four independent analog signals.
13	−IN D	Inverting input for Channel D; matches input offset drift (0.5–1.75 µV/°C) across all four channels.
14	OUT D	Amplifier D output; specified for 13.9 MHz −3 dB bandwidth and 0.003% THD+N at 1 kHz.

Key Features

Feature	Design Value
Rail-to-rail input and output	Enables full dynamic range utilization in single-supply systems (e.g., 3.3 V microcontroller interfaces) without external level shifters.
Low 3.9 nV/√Hz voltage noise	Preserves SNR in front-end amplification of low-level sensors (e.g., piezoelectric accelerometers) without requiring post-amplification filtering.
15.9 MHz gain bandwidth	Supports active filter design up to 2nd-order Butterworth response at 1 MHz with <0.1 dB passband ripple.
0.75 mA/amplifier max quiescent current	Permits four-channel operation in battery-powered devices (e.g., portable DAQ) with >100-hour runtime on 2000 mAh Li-ion cells.
−40°C to +125°C operation	Validated for under-hood automotive applications and industrial PLC analog I/O modules without derating.
Unity-gain stable	Eliminates need for external compensation components in buffer, gain-of-1, or inverting amplifier configurations.

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 amplifier with rail-to-rail input accepting 0–3.3 V common-mode range from MCU ADC reference. Use Value: 100 µV max offset ensures <0.01% reading error in 10 V full-scale measurement; 3.9 nV/√Hz noise preserves resolution down to 1 µV steps.	Use Scenario: Bidirectional current monitoring in 24 V industrial motor drive using 10 mΩ shunt resistor. IC Role / Device Role / Timing Role: High CMRR (>106 dB at ±14 V) differential amplifier rejecting bus noise while amplifying ±250 mV shunt drops. Use Value: Rail-to-rail output swings 0–24 V to match PLC analog input range; 4.6 V/µs slew handles 10 A/s di/dt transients without distortion.
ADC Input Buffers	DAC Output Amplifiers
Use Scenario: Driving SAR ADC inputs (e.g., AD7980) with 1 MSPS sampling and 16-bit linearity requirements. IC Role / Device Role / Timing Role: Low-output-impedance buffer (0.1 Ω closed-loop ZOUT) settling to 0.1% in 4 µs for 10 V step. Use Value: 13.9 MHz −3 dB bandwidth prevents aliasing; 0.003% THD+N avoids harmonic corruption of ADC FFT results.	Use Scenario: Amplifying voltage-output DAC (e.g., AD5689) to ±10 V industrial control range with 0.1% accuracy. IC Role / Device Role / Timing Role: Inverting gain-of-2 amplifier using matched internal resistors; rail-to-rail output delivers full ±10 V swing. Use Value: 15.9 MHz GBP ensures flat frequency response to 500 kHz; 100 µV offset contributes <0.001% FSR error at ±10 V scale.

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 amplifier with rail-to-rail input accepting 0–3.3 V common-mode range from MCU ADC reference.

Use Value: 100 µV max offset ensures <0.01% reading error in 10 V full-scale measurement; 3.9 nV/√Hz noise preserves resolution down to 1 µV steps.

Use Scenario: Bidirectional current monitoring in 24 V industrial motor drive using 10 mΩ shunt resistor.

IC Role / Device Role / Timing Role: High CMRR (>106 dB at ±14 V) differential amplifier rejecting bus noise while amplifying ±250 mV shunt drops.

Use Value: Rail-to-rail output swings 0–24 V to match PLC analog input range; 4.6 V/µs slew handles 10 A/s di/dt transients without distortion.

ADC Input Buffers

DAC Output Amplifiers

Use Scenario: Driving SAR ADC inputs (e.g., AD7980) with 1 MSPS sampling and 16-bit linearity requirements.

IC Role / Device Role / Timing Role: Low-output-impedance buffer (0.1 Ω closed-loop ZOUT) settling to 0.1% in 4 µs for 10 V step.

Use Value: 13.9 MHz −3 dB bandwidth prevents aliasing; 0.003% THD+N avoids harmonic corruption of ADC FFT results.

Use Scenario: Amplifying voltage-output DAC (e.g., AD5689) to ±10 V industrial control range with 0.1% accuracy.

IC Role / Device Role / Timing Role: Inverting gain-of-2 amplifier using matched internal resistors; rail-to-rail output delivers full ±10 V swing.

Use Value: 15.9 MHz GBP ensures flat frequency response to 500 kHz; 100 µV offset contributes <0.001% FSR error at ±10 V scale.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad precision op amp applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADA4084-4ACPZ-R7	16-lead LFCSP package (θJA = 55°C/W); same electrical specs but lower thermal resistance and exposed pad tied to V−.	Preferred for high-density PCBs with strict thermal limits; requires soldering exposed pad to V− plane.	Select ADA4084-4ACPZ-R7 when board space and thermal dissipation are critical; ADA4084-4ARUZ-RL suits standard TSSOP layouts with simpler assembly.
AD8674ARZ	2.8 nV/√Hz noise (lower), but only rail-to-rail output (not input); 10 MHz GBP; higher 2.3 mA/amplifier supply current.	Better for ultra-low-noise DC apps where input common-mode range > V− is not required; less suitable for single-supply sensor front-ends.	Choose AD8674ARZ for lowest-noise precision buffers where rail-to-rail input is unnecessary; ADA4084-4ARUZ-RL is superior for single-supply, wide common-mode, low-power use cases.

Compared with ADA4084-4ACPZ-R7, ADA4084-4ARUZ-RL trades thermal performance for simplified assembly and legacy TSSOP compatibility; versus AD8674ARZ, it sacrifices 1.1 nV/√Hz noise to gain rail-to-rail input, 50% lower quiescent current, and wider supply range-making it more versatile in battery-powered and industrial sensing.

Availability

ADA4084-4ARUZ-RL is available at Aetrix Electronics and suitable for battery-powered instrumentation, high-side/low-side current sensing, and ADC/DAC interface circuits requiring stable component supply across automotive, industrial, and test equipment programs.

Supply support for ADA4084-4ARUZ-RL 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 targets precision, low-noise, wide-bandwidth applications in harsh environments-designed specifically for sensor signal conditioning, data acquisition, and industrial control where rail-to-rail operation and thermal robustness are mandatory.

FAQ

What supply voltage ranges does the ADA4084-4ARUZ-RL support?

The ADA4084-4ARUZ-RL operates from ±1.5 V to ±15 V (dual supply) or +3 V to +30 V (single supply), with full rail-to-rail input and output functionality across this entire range. At ±15 V, it delivers 4.6 V/µs slew rate and 13.9 MHz −3 dB bandwidth. Absolute maximum supply is ±18 V per the datasheet's Absolute Maximum Ratings table.

Is the ADA4084-4ARUZ-RL unity-gain stable?

Yes, the ADA4084-4ARUZ-RL is explicitly unity-gain stable, with 86° phase margin at AV = 1. This eliminates the need for external compensation capacitors in buffer, follower, or inverting amplifier configurations. The device maintains stability driving capacitive loads up to 100 pF without oscillation, as verified in the Typical Performance Characteristics section.

What is the input offset voltage specification for ADA4084-4ARUZ-RL?

The ADA4084-4ARUZ-RL has a maximum input offset voltage of 100 µV at 25°C (TSSOP package), rising to 250 µV over the full −40°C to +125°C industrial temperature range. This is confirmed in Table 2 (3 V supply), Table 3 (±5 V), and Table 4 (±15 V) of the Rev. I datasheet, with consistent 100 µV typical value across all tested conditions.

Does ADA4084-4ARUZ-RL support rail-to-rail input and output simultaneously?

Yes-the ADA4084-4ARUZ-RL supports true rail-to-rail input (common-mode range extends from V− to V+) and rail-to-rail output (swing within 30 mV of rails at ±15 V, 2 kΩ load). This dual capability is highlighted in the Features section and validated in Figures 17 (VOS vs. VCM) and 21 (dropout voltage) of the datasheet.

What package type is used for ADA4084-4ARUZ-RL?

The ADA4084-4ARUZ-RL uses a 14-lead TSSOP package (RU-14), as confirmed in the Ordering Guide and Pin Configurations section (Figure 8 and Table 11). It is not the LFCSP variant (which carries suffix -ACPZ-R7); the RUZ suffix denotes RoHS-compliant TSSOP with tape-and-reel packaging.

ADA4084-4ARUZ-RL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Amplifier Type:: General Purpose

Number of Circuits:: 4

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:: 60 µV

Current - Supply:: 625µA (x4 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:: 14-TSSOP

ADA4084-4ARUZ-RL FAQ

1.How can I place an order for ADA4084-4ARUZ-RL through Aetrix?

Please submit a Request for Quotation (RFQ) for ADA4084-4ARUZ-RL 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 ADA4084-4ARUZ-RL reliable?

The price and inventory of ADA4084-4ARUZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4084-4ARUZ-RL is usually 5 days.

3.What payment methods are accepted for ADA4084-4ARUZ-RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4084-4ARUZ-RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ADA4084-4ARUZ-RL?

ADA4084-4ARUZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADA4084-4ARUZ-RL 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 ADA4084-4ARUZ-RL?

For technical support, including ADA4084-4ARUZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4084-4ARUZ-RL requirements.

6.How does Aetrix verify that ADA4084-4ARUZ-RL is sourced from the original manufacturer or authorized distributors?

All ADA4084-4ARUZ-RL 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 ADA4084-4ARUZ-RL meets industry standards.

7.What is the process for return or replacement of ADA4084-4ARUZ-RL?

All ADA4084-4ARUZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADA4084-4ARUZ-RL, 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 ADA4084-4ARUZ-RL part is unused and in its original packaging.

Return procedure for ADA4084-4ARUZ-RL:

1.Submit a request within 90 days.

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

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