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Analog Devices Inc. AD8279BRZ
- Part No.:
- AD8279BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8279BRZ.pdf
- Description:
- IC OPAMP DIFF 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,225
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Product details
Overview
AD8279BRZ from Analog Devices is a dual-channel, low-power, wide-supply-range difference amplifier with fixed gains of G = ½ and G = 2, designed for precision current/voltage monitoring in battery-powered and industrial instrumentation systems. It delivers 80 dB CMRR (dc to 20 kHz), 1 MHz bandwidth at G = ½, and operates from ±2 V to ±18 V or +2.0 V to +36 V single supply, with 300 μA max supply current per channel.
For engineers reviewing the AD8279BRZ datasheet, AD8279BRZ pinout, AD8279BRZ application, or AD8279BRZ equivalent, this page provides verified technical context, validated pin functions, real-world use cases in current sensing and voltage monitoring, and confirmed alternative options for design continuity and sourcing flexibility.
Technical Context
The AD8279BRZ integrates two matched, laser-trimmed resistor networks (40kΩ/20kΩ ratio) enabling precise differential gain configurations without external components. Its input stage supports common-mode voltages up to ±3× supply rails (G = ½), with rugged overvoltage protection on all inputs.
It features rail-to-rail output swing (−VS + 0.2 V to +VS − 0.2 V), 1.4 V/μs slew rate, and low drift performance: ±1 μV/°C offset drift and 1 ppm/°C gain drift (B grade), making it suitable for high-accuracy signal conditioning where thermal stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = ½ or G = 2 - fixed-ratio internal resistors eliminate external gain-setting components and ensure matched temperature drift. |
| CMRR (RTI) | 80 dB min (dc–20 kHz, G = ½) - enables accurate measurement of small differential signals riding on large common-mode voltages (e.g., shunt-based current sensing). |
| Supply Range | ±2 V to ±18 V dual or +2.0 V to +36 V single - supports wide-input industrial sensors and ultra-low-voltage portable systems without level-shifting circuitry. |
| Supply Current | 300 μA max per channel (TA = 25°C) - enables multi-year operation on coin-cell batteries in remote monitoring nodes. |
| Bandwidth | 1 MHz at G = ½, 550 kHz at G = 2 - sufficient for DC–500 kHz current/voltage feedback loops in motor control and power supplies. |
| Input Voltage Range | −3(VS + 0.1) V to +3(VS − 1.5) V (G = ½) - allows direct connection to high-side shunts operating beyond supply rails (e.g., 48 V bus monitoring with ±15 V supplies). |
| Output Swing | −VS + 0.2 V to +VS − 0.2 V (RL = 10 kΩ) - ensures full dynamic range utilization into standard ADC reference ranges without clipping. |
Pinout & Package
AD8279BRZ is housed in a 14-lead SOIC package (JEDEC MS-012AA, body width 3.9 mm). Pin functions are fully defined in Analog Devices' Rev. C datasheet and validated for industrial temperature operation (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | NC | No-connect pins - must remain unconnected; no internal function or parasitic coupling. |
| 2, 6 | −INA / −INB | Inverting inputs for Channel A and B - accept differential input signals referenced to SENSEA/SENSEB terminals. |
| 3, 5 | +INA / +INB | Noninverting inputs for Channel A and B - used with −INA/−INB to form differential input pairs. |
| 4 | −VS | Negative supply rail - required for dual-supply operation; tied to ground in single-supply configurations. |
| 8 | REFB | Channel B reference voltage input - sets output common-mode level; typically connected to midsupply or system reference. |
| 9 | OUTB | Channel B amplified output - provides G × (V+INB − V−INB) + VREFB with rail-to-rail capability. |
| 10 | SENSEB | Channel B sense terminal - connects to load/shunt return path to enable true Kelvin sensing and reject PCB trace resistance errors. |
| 11 | +VS | Positive supply rail - powers both channels; supports up to +36 V in single-supply mode. |
| 12 | SENSEA | Channel A sense terminal - identical function to SENSEB; enables independent 4-wire sensing per channel. |
| 13 | OUTA | Channel A amplified output - delivers G × (V+INA − V−INA) + VREFA; fully independent of OUTB. |
| 14 | REFA | Channel A reference voltage input - decoupled from REFB, allowing independent output level setting per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Ensures <0.02% gain error and <5 ppm/°C gain drift - eliminates manual calibration in production test. |
| Rugged input overvoltage protection | Withstands −VS + 40 V to +VS − 40 V at any input pin - protects against transients in motor drive and automotive battery monitoring. |
| Dual independent channels | Enables simultaneous monitoring of two shunts or sensor outputs without crosstalk (130 dB channel separation at 1 kHz). |
| Wide input common-mode range | Supports >±27 V common-mode input with ±15 V supplies - allows direct high-side current sensing on 24 V/48 V industrial buses. |
| Low power dissipation | 0.75 mW per channel at ±5 V - reduces thermal load in dense PCB layouts and extends battery life in portable diagnostics tools. |
Applications
| High-Side Current Monitoring | Voltage Rail Monitoring |
|---|---|
Use Scenario: Measuring load current in a 48 V telecom power supply using a 1 mΩ shunt placed between the positive rail and load. IC Role / Device Role / Timing Role: AD8279BRZ acts as a dual-channel difference amplifier, rejecting the 48 V common-mode voltage while amplifying the 10–100 mV shunt drop with G = 2 for optimal ADC resolution. Use Value: Enables accurate, isolated current measurement without optocouplers or isolated power supplies due to its extended input range and integrated overvoltage protection. |
Use Scenario: Monitoring multiple DC rails (+12 V, +5 V, +3.3 V) in an industrial PLC backplane for fault detection and redundancy management. IC Role / Device Role / Timing Role: AD8279BRZ channels independently condition each rail's voltage relative to system ground, scaling outputs to 0–2.5 V for a shared 12-bit SAR ADC. Use Value: Reduces component count by replacing four discrete op-amp + resistor networks with one IC, improving long-term gain matching and thermal tracking. |
| Portable Battery Management | Industrial Sensor Signal Conditioning |
Use Scenario: Real-time cell voltage and pack current monitoring in a handheld medical device powered by a 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: AD8279BRZ operates from +2.7 V single supply, measuring cell voltage (G = ½) and shunt current (G = 2) simultaneously with sub-μV/°C offset drift. Use Value: Extends runtime by consuming only 300 μA per channel while maintaining <0.1% measurement accuracy across −20°C to +60°C ambient. |
Use Scenario: Conditioning output from a 4–20 mA loop-powered pressure transmitter in a hazardous-area process controller. IC Role / Device Role / Timing Role: AD8279BRZ converts the loop current to a precise voltage (via precision shunt), then amplifies and level-shifts it to match the ADC input range. Use Value: Eliminates need for external precision resistors and trimming, reducing calibration time and improving field reliability under temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8276ARZ | Single-channel, G = ½ or G = 2, 200 μA supply current, 8-lead SOIC package. | Suitable for single-signal monitoring; lacks dual-channel integration and independent REF/SENSE per channel. | Select when only one differential measurement is needed and board space is constrained - lower cost but requires two units for dual-channel use. |
| INA199A2DCKR | Single-channel, G = 100 V/V, 65 μA supply current, SC70-6 package; optimized for high-gain current sensing. | Not pin-compatible; limited to high-side-only sensing with fixed high gain; no support for G = ½ or dual channels. | Choose for ultra-low-power, high-gain shunt monitoring where bandwidth <100 kHz suffices and dual-channel functionality is unnecessary. |
Compared with AD8276ARZ and INA199A2DCKR, the AD8279BRZ uniquely delivers dual independent difference amplifiers in one 14-lead SOIC, enabling synchronized, thermally matched measurements without inter-channel drift - critical for multi-phase motor current analysis and redundant power rail monitoring.
Availability
AD8279BRZ is available at Aetrix Electronics and suitable for high-reliability current sensing, industrial voltage monitoring, and portable instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AD8279BRZ 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 AD8279BRZ belongs to Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in power-critical applications such as battery management, motor control, and industrial process monitoring.
FAQ
What is the maximum common-mode input voltage supported by the AD8279BRZ?
The AD8279BRZ supports input common-mode voltages from −3(VS + 0.1) V to +3(VS − 1.5) V in G = ½ configuration. With ±15 V supplies, this extends to ±27 V - enabling direct high-side shunt monitoring on 24 V and 48 V industrial buses without external level-shifting circuitry. This specification is validated per Analog Devices Rev. C datasheet Table 2.
Does the AD8279BRZ require external resistors to set gain?
No. The AD8279BRZ integrates laser-trimmed thin-film resistors to provide factory-set gains of G = ½ or G = 2. No external gain-setting components are needed, ensuring guaranteed initial accuracy (<0.02% gain error) and excellent temperature tracking (<1 ppm/°C gain drift) without user calibration.
Can the AD8279BRZ operate from a single 3.3 V supply?
Yes. The AD8279BRZ supports single-supply operation from +2.0 V to +36 V. At +3.3 V, it delivers full functionality with 375 μA max supply current per channel (Table 4), 870 kHz bandwidth (G = ½), and output swing from 0.1 V to 3.15 V - compatible with 3.3 V ADCs and microcontrollers with rail-to-rail inputs.
How does the SENSE pin improve measurement accuracy in the AD8279BRZ?
The SENSEA and SENSEB pins enable true 4-wire (Kelvin) sensing by connecting directly to the shunt resistor's load-side terminals. This eliminates errors from PCB trace resistance and contact voltage drops, ensuring the AD8279BRZ amplifies only the pure differential voltage across the shunt - critical for sub-milliohm shunt accuracy in high-current applications.
Is the AD8279BRZ RoHS compliant and qualified for industrial temperature range?
Yes. The AD8279BRZ is fully RoHS compliant and specified for operation across the industrial temperature range of −40°C to +85°C. Its performance parameters - including offset drift (±1 μV/°C), gain drift (1 ppm/°C), and CMRR (80 dB min) - are guaranteed over this full range per the Rev. C datasheet specifications.
AD8279BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- -
- 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:
- 14-SOIC
AD8279BRZ FAQ
1.How can I place an order for AD8279BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8279BRZ 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 AD8279BRZ reliable?
The price and inventory of AD8279BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8279BRZ is usually 5 days.
3.What payment methods are accepted for AD8279BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8279BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8279BRZ?
AD8279BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8279BRZ 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 AD8279BRZ?
For technical support, including AD8279BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8279BRZ requirements.
6.How does Aetrix verify that AD8279BRZ is sourced from the original manufacturer or authorized distributors?
All AD8279BRZ 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 AD8279BRZ meets industry standards.
7.What is the process for return or replacement of AD8279BRZ?
All AD8279BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8279BRZ, 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 AD8279BRZ part is unused and in its original packaging.
Return procedure for AD8279BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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