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Analog Devices Inc. AD8276ARZ
- Part No.:
- AD8276ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8276ARZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
AD8276ARZ from Analog Devices is a precision unity-gain difference amplifier optimized for low-power, wide-supply-range signal conditioning in current and voltage monitoring applications. It delivers 86 dB CMRR (dc to 10 kHz), 550 kHz bandwidth, ±2 µV/°C system offset drift (B grade), 1 ppm/°C gain drift, and operates from single supplies as low as 2.0 V up to 36 V or dual supplies ±2 V to ±18 V.
For engineers reviewing the AD8276ARZ datasheet, AD8276ARZ pinout, AD8276ARZ application, or AD8276ARZ equivalent, this device is selected for high-accuracy differential measurement where rail-to-rail input common-mode range beyond supplies, rugged input overvoltage protection, and ultra-low quiescent current (200 µA max) are critical in battery-powered instrumentation and industrial sensing systems.
Technical Context
The AD8276ARZ integrates four laser-trimmed on-chip resistors with a low-noise, low-power op amp to form a fully matched difference amplifier topology. Its internal resistor network enables precise gain setting without external components while maintaining ratio matching for high CMRR and minimal gain drift across temperature.
Input voltage range extends to −2(VS + 0.1) V to +2(VS − 1.5) V - enabling measurement of signals beyond supply rails - and ESD-protected inputs tolerate voltages from −VS + 40 V to +VS − 40 V, eliminating need for external overvoltage clamping circuitry in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CMRR | 86 dB min (dc to 10 kHz): ensures accurate rejection of common-mode noise in noisy industrial or motor-control environments. |
| Bandwidth | 550 kHz: supports fast transient response in real-time current/voltage monitoring up to ~50 kHz signal content. |
| Supply Current | 200 µA max per channel: enables multi-channel sensing in energy-constrained portable or remote IoT nodes. |
| Input Range | −2(VS + 0.1) V to +2(VS − 1.5) V: allows direct measurement of high-side shunt voltages without level-shifting circuitry. |
| Gain Drift | 1 ppm/°C max (B grade): guarantees stable gain calibration over −40°C to +85°C industrial temperature range. |
| System Offset Drift | ±2 µV/°C max (B grade): minimizes thermal-induced error in precision dc-coupled measurement chains. |
| Slew Rate | 1.1 V/µs: supports clean amplification of fast step inputs (e.g., fault detection pulses) without distortion. |
Pinout & Package
The AD8276ARZ is housed in an 8-lead SOIC package (R-8) with standard JEDEC footprint and RoHS-compliant lead finish. Thermal resistance θJA = 121°C/W (4-layer board, no airflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Reference Voltage Input | Sets output common-mode level; accepts dc bias or midsupply reference for single-supply operation. |
| 2 −IN | Inverting Input | One leg of differential input pair; connected internally to precision 40 kΩ resistor network. |
| 3 +IN | Noninverting Input | Second leg of differential input pair; forms matched attenuator with −IN for rail-to-rail input handling. |
| 4 −VS | Negative Supply | Ground or negative rail connection; supports true dual-supply or single-supply configurations. |
| 5 SENSE | Sense Terminal | Feedback node for output stage; enables Kelvin sensing to reject trace resistance errors in PCB layout. |
| 6 OUT | Output | Differential amplifier output; drives 10 kΩ load with ±(VS − 0.2) V swing at ±15 V supplies. |
| 7 +VS | Positive Supply | Main power rail; accepts 2.0 V to 36 V single or ±2 V to ±18 V dual supply operation. |
| 8 NC | No Connect | Unbonded pad; must remain floating - no external connection required or recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends beyond supplies (e.g., ±30 V on ±10 V rails), enabling direct high-side current sensing without external level shifters. |
| Laser-trimmed resistor network | 4 × 40 kΩ on-chip resistors trimmed for <1 ppm/°C gain drift and >86 dB CMRR - eliminates manual trimming and improves production yield. |
| Rugged input overvoltage protection | Withstands −VS + 40 V to +VS − 40 V at all inputs - removes need for external TVS diodes or series resistors in 24 V industrial systems. |
| Low power dissipation | 0.54 mW at 2.7 V supply - supports always-on monitoring in battery-backed data loggers and smart sensors. |
| Unity-gain stability | Stable in G = 1 configuration without external compensation - simplifies design for fixed-gain differential measurement circuits. |
Applications
| High-Side Current Monitoring | Voltage Measurement in Industrial PLCs |
|---|---|
Use Scenario: Measuring motor phase current via shunt resistor placed between power rail and load. IC Role / Device Role / Timing Role: Difference amplifier configured for G = 1 to reject common-mode bus voltage while amplifying small differential shunt voltage. Use Value: Enables accurate current feedback with 86 dB CMRR even when common-mode voltage swings from 0 V to 30 V, reducing need for isolated amplifiers. | Use Scenario: Monitoring 0–10 V analog output signals from sensor transmitters in programmable logic controllers. IC Role / Device Role / Timing Role: Precision unity-gain buffer with rail-to-rail input capability to condition signals without attenuation or clipping. Use Value: Maintains signal integrity across full 0–10 V range using single 12 V supply, avoiding dual-rail complexity and improving system reliability. |
| Battery Voltage Supervision | Portable Test Equipment Front-End |
Use Scenario: Monitoring cell stack voltage in 4S Li-ion battery packs (0–16.8 V) with microcontroller ADC input limited to 3.3 V. IC Role / Device Role / Timing Role: Differential amplifier referenced to midsupply to scale and level-shift high-voltage battery measurements into safe ADC range. Use Value: Achieves ±0.1% gain accuracy and <2 µV/°C offset drift over temperature - critical for state-of-charge estimation accuracy. | Use Scenario: Signal conditioning front-end in handheld multimeters or portable oscilloscope probes. IC Role / Device Role / Timing Role: Low-power, wide-supply difference amplifier driving SAR ADC with minimal power budget impact. Use Value: 200 µA supply current and 550 kHz bandwidth support 100 kSPS sampling with <0.01% nonlinearity - meeting Class II metering requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8271ARMZ | Higher bandwidth (1.5 MHz), higher supply current (450 µA), same SOIC-8 package and pinout. | Better suited for higher-speed applications like motor control loop feedback; less optimal for ultra-low-power designs. | Select AD8271ARMZ when bandwidth >1 MHz is required and power budget allows >2× quiescent current. |
| INA199A1DCKR | Fixed gain (50 V/V), lower CMRR (70 dB), smaller SC70-6 package, 120 µA supply current. | Optimized for unidirectional current sensing only; lacks flexible reference input and rail-to-rail input range. | Choose INA199A1DCKR for cost-sensitive, space-constrained, single-gain current-sense applications where CMRR >80 dB is not mandatory. |
Compared with AD8276ARZ, AD8271ARMZ trades power efficiency for speed, while INA199A1DCKR sacrifices configurability and CMRR for size and cost - making AD8276ARZ the balanced choice for general-purpose, low-power, high-accuracy differential measurement.
Availability
AD8276ARZ is available at Aetrix Electronics and suitable for high-accuracy current monitoring, industrial voltage supervision, and portable test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for AD8276ARZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with decades of expertise in precision amplifiers and signal conditioning.
The AD8276 belongs to Analog Devices' precision difference amplifier product line, designed specifically for low-power, wide-supply, high-CMRR measurement applications in industrial, automotive, and portable instrumentation systems.
FAQ
What is the maximum input voltage range supported by the AD8276ARZ?
The AD8276ARZ supports an input common-mode voltage range from −2(VS + 0.1) V to +2(VS − 1.5) V. For example, with ±15 V supplies, inputs can safely reach ±27 V. Absolute maximum ratings allow −VS + 40 V to +VS − 40 V at any input pin - meaning ±30 V is permissible on ±10 V rails. This rail-to-rail input capability is intrinsic to the AD8276ARZ architecture and requires no external components.
Does the AD8276ARZ require external resistors for unity-gain operation?
No, the AD8276ARZ does not require external resistors for unity-gain operation. It integrates four precisely matched 40 kΩ laser-trimmed resistors internally, forming a complete difference amplifier with G = 1. The AD8276ARZ is configured out-of-the-box for differential input to single-ended output with no external gain-setting components needed - simplifying layout and improving long-term stability.
What is the typical CMRR performance of the AD8276ARZ over frequency?
The AD8276ARZ maintains ≥86 dB CMRR from dc to 10 kHz, and ≥80 dB up to 100 kHz as shown in Figure 14 of the datasheet. This high-frequency CMRR is enabled by internal resistor matching and absence of exposed op-amp inputs - unlike discrete solutions where PCB parasitics degrade performance. At 1 MHz, CMRR remains >60 dB, making the AD8276ARZ suitable for switching power supply monitoring where high-frequency noise rejection is essential.
Can the AD8276ARZ be used with a single 3.3 V supply?
Yes, the AD8276ARZ operates from single supplies as low as 2.0 V up to 36 V. With a 3.3 V supply, it delivers 450 kHz bandwidth, 1.0 V/µs slew rate, and maintains 86 dB CMRR at VCM = 0 V to 2.4 V. Output swing reaches −VS + 0.1 V to +VS − 0.15 V (i.e., 0.1 V to 3.15 V), and supply current remains ≤200 µA - confirming full functionality and specified performance in low-voltage embedded systems using the AD8276ARZ.
How does the SENSE pin function in the AD8276ARZ?
The SENSE pin (Pin 5) in the AD8276ARZ provides Kelvin connection to the output stage, allowing separation of load current return path from output voltage sensing. When used with a 4-wire PCB layout, the SENSE pin routes feedback directly to the amplifier's internal output node - rejecting voltage drop across PCB traces or bond wires. This ensures accurate gain and linearity in high-current or high-precision applications, and is a key differentiator of the AD8276ARZ versus basic op-amp-based difference circuits.
AD8276ARZ 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:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.1V/µs
- Gain Bandwidth Product:
- 550 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8276ARZ FAQ
1.How can I place an order for AD8276ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8276ARZ 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 AD8276ARZ reliable?
The price and inventory of AD8276ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8276ARZ is usually 5 days.
3.What payment methods are accepted for AD8276ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8276ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8276ARZ?
AD8276ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8276ARZ 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 AD8276ARZ?
For technical support, including AD8276ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8276ARZ requirements.
6.How does Aetrix verify that AD8276ARZ is sourced from the original manufacturer or authorized distributors?
All AD8276ARZ 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 AD8276ARZ meets industry standards.
7.What is the process for return or replacement of AD8276ARZ?
All AD8276ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8276ARZ, 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 AD8276ARZ part is unused and in its original packaging.
Return procedure for AD8276ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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