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Analog Devices Inc. AD8276BRZ
- Part No.:
- AD8276BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8276BRZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:244
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Product details
Overview
AD8276BRZ from Analog Devices is a precision unity-gain difference amplifier optimized for low-power, wide-supply-range signal conditioning in current/voltage monitoring and battery-powered instrumentation. 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 2.0 V to 36 V single supply or ±2 V to ±18 V dual supply.
For engineers reviewing the AD8276BRZ datasheet, AD8276BRZ pinout, AD8276BRZ application, or AD8276BRZ equivalent, this device serves as a compact, laser-trimmed alternative to discrete resistor-based difference amplifiers-offering superior CMRR stability, rail-to-rail input voltage range beyond supplies, and rugged input overvoltage protection up to ±40 V relative to rails.
Technical Context
The AD8276BRZ integrates a low-power op amp with four laser-trimmed on-chip 40 kΩ resistors, enabling precise G = 1 difference amplification without external components. Its internal resistor ratio matching ensures high CMRR and minimal gain drift across temperature.
Input common-mode voltage extends to −2(VS + 0.1) V to +2(VS − 1.5) V, allowing measurement of signals beyond supply rails. Input ESD protection and internal clamping enable operation with input voltages ranging from −VS + 40 V to +VS − 40 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CMRR | 86 dB min (dc–10 kHz); ensures accurate differential signal extraction in noisy industrial environments |
| Bandwidth | 550 kHz; supports fast transient response in motor current sensing and power supply monitoring |
| Supply Current | 200 μA max per channel; enables multi-channel monitoring in energy-constrained portable systems |
| Input Voltage 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); maintains calibration integrity 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 measurements |
| Slew Rate | 1.1 V/μs; supports clean amplification of fast-rising fault currents in protection circuits |
Pinout & Package
The AD8276BRZ is housed in an 8-lead SOIC package (R-8), with exposed pad not connected. Pin 8 is NC (no connect). Thermal resistance θJA = 121°C/W on 4-layer JEDEC board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Voltage Input | Sets output common-mode level; tied to midsupply or ground for single-ended output configuration |
| 2 (−IN) | Inverting Input | Connects to shunt resistor low-side or inverted signal path in difference mode |
| 3 (+IN) | Noninverting Input | Connects to shunt resistor high-side or primary signal source |
| 4 (−VS) | Negative Supply | Supports dual-supply operation down to −2 V; omitted in single-supply designs |
| 5 (SENSE) | Sense Terminal | Provides Kelvin connection to load side of sense resistor, eliminating trace resistance error |
| 6 (OUT) | Output | Delivers amplified differential voltage referenced to REF; drives 10 kΩ load with ±0.2 V swing margin at ±15 V supply |
| 7 (+VS) | Positive Supply | Accepts 2.0 V to 36 V single supply or +2 V to +18 V dual supply rail |
| 8 (NC) | No Connect | Internally unconnected; must remain floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 40 kΩ resistor network | Enables 86 dB CMRR and 1 ppm/°C gain drift without external trimming or calibration |
| Rail-to-rail input beyond supplies | Measures ±30 V differential signals on ±10 V supplies-eliminates need for external attenuators or level shifters |
| Rugged input overvoltage protection | Withstands −VS + 40 V to +VS − 40 V at all inputs-reduces system-level protection component count |
| Low quiescent power dissipation | 0.54 mW at 2.7 V supply-extends battery life in handheld multimeters and portable data loggers |
| Unity-gain stable architecture | Operates reliably in G = 1, −1, or +2 configurations without external compensation |
Applications
| Current Sensing in Motor Drives | Voltage Monitoring in Industrial Power Supplies |
|---|---|
Use Scenario: High-side current measurement across 10 mΩ shunt in 48 V BLDC motor controller with ±15 V supply. IC Role / Device Role / Timing Role: Difference amplifier rejecting common-mode bus voltage while amplifying millivolt-level shunt drop. Use Value: 86 dB CMRR suppresses PWM switching noise; 550 kHz bandwidth captures current transients during commutation. | Use Scenario: Monitoring output voltage ripple and regulation accuracy in isolated 24 V/5 A AC-DC power supply. IC Role / Device Role / Timing Role: Precision difference amplifier measuring differential voltage across series-connected sense resistors. Use Value: ±2 μV/°C offset drift ensures <100 μV total error over 0–70°C ambient; 1 ppm/°C gain drift preserves calibration across line/load changes. |
| Battery Cell Voltage Balancing | Portable Multimeter Front-End |
Use Scenario: Measuring individual cell voltages in 12-cell Li-ion pack (0–4.2 V/cell) using single 3.3 V supply. IC Role / Device Role / Timing Role: High-common-mode difference amplifier with REF tied to local cell stack reference. Use Value: Input range extends to +2(VS − 1.5) V = +3.6 V, enabling direct measurement of top cell without level-shifting. | Use Scenario: DC voltage measurement front-end in handheld DMM with auto-ranging and 200 μA supply budget. IC Role / Device Role / Timing Role: Low-power, laser-trimmed difference amplifier scaling input to ADC full-scale range. Use Value: 200 μA supply current enables >100 hr battery life on two AA cells; 0.005% gain error reduces calibration burden. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA199A1DRVT | Fixed gain (50 V/V), lower bandwidth (100 kHz), no SENSE pin, higher supply current (135 μA) | Optimized for unidirectional current sensing only; lacks flexible REF and SENSE for precision voltage monitoring | Select when fixed high gain and minimal external components outweigh need for adjustable common-mode rejection and rail-to-rail input range. |
| AD8476ARMZ | Differential output (not single-ended), 5 MHz bandwidth, 1.2 mA supply current, requires dual supply for full performance | Targets high-speed data acquisition and ADC driver applications-not suited for low-power, single-supply monitoring | Select when driving fully differential ADC inputs with high SNR and wide bandwidth is required, and power budget permits 6× higher current draw. |
Compared with INA199A1DRVT and AD8476ARMZ, the AD8276BRZ uniquely balances ultra-low power (200 μA), rail-to-rail input beyond supplies, and flexible single-ended output via REF/SENSE-making it optimal for portable, multi-function instrumentation where supply headroom and measurement versatility are constrained.
Availability
AD8276BRZ is available at Aetrix Electronics and suitable for current sensing in motor drives, voltage monitoring in industrial power supplies, and battery management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD8276BRZ 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, serving industrial, automotive, communications, and healthcare markets.
The AD8276BRZ belongs to Analog Devices' precision difference amplifier product line, designed specifically for low-power, high-CMRR signal conditioning in space- and energy-constrained applications such as portable test equipment and distributed sensor nodes.
FAQ
What is the maximum input voltage range supported by the AD8276BRZ?
The AD8276BRZ supports an input voltage range from −2(VS + 0.1) V to +2(VS − 1.5) V, enabling measurement beyond supply rails-for example, ±30 V on ±10 V supplies. Absolute maximum ratings allow −VS + 40 V to +VS − 40 V at any input pin. This capability is confirmed in the Absolute Maximum Ratings and Input Voltage Range sections of the AD8276BRZ datasheet Rev. D.
Does the AD8276BRZ require external resistors for unity-gain difference amplification?
No, the AD8276BRZ does not require external resistors for G = 1 operation. It integrates four laser-trimmed 40 kΩ resistors internally, forming a complete difference amplifier with guaranteed 86 dB CMRR and 1 ppm/°C gain drift. External resistors are unnecessary unless configuring nonstandard gains or custom topologies, as detailed in the Functional Block Diagram and Theory of Operation sections of the AD8276BRZ datasheet.
What is the purpose of the SENSE pin on the AD8276BRZ?
Pin 5 (SENSE) on the AD8276BRZ provides a Kelvin connection point to the load side of the sense resistor, isolating trace resistance from the feedback path. This eliminates voltage drop errors caused by PCB trace impedance-critical for sub-milliohm shunt accuracy. The SENSE pin connects directly to the internal resistor network's feedback node, as shown in Figure 1 and described in the Pin Function Descriptions table of the AD8276BRZ datasheet.
Can the AD8276BRZ operate from a single 3.3 V supply?
Yes, the AD8276BRZ operates from a single 3.3 V supply, well within its 2.0 V to 36 V specification. At 3.3 V, typical bandwidth is 450 kHz, supply current remains ≤200 μA, and output swing is −3.2 V to +3.15 V (referred to supply rails) with 10 kΩ load. These values are verified in Table 3 (Single-Supply Conditions) and Figure 17 of the AD8276BRZ datasheet Rev. D.
How does the REF pin affect the output common-mode voltage of the AD8276BRZ?
The REF pin sets the output common-mode voltage of the AD8276BRZ. When REF is tied to ground, the output centers at 0 V; when tied to midsupply (e.g., 1.65 V on 3.3 V), the output swings symmetrically around that level. This flexibility enables seamless interfacing with single-ended ADCs or differential receivers. The relationship is explicitly defined in the General Description and Applications Information sections of the AD8276BRZ datasheet.
AD8276BRZ 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
AD8276BRZ FAQ
1.How can I place an order for AD8276BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8276BRZ 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 AD8276BRZ reliable?
The price and inventory of AD8276BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8276BRZ is usually 5 days.
3.What payment methods are accepted for AD8276BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8276BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8276BRZ?
AD8276BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8276BRZ 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 AD8276BRZ?
For technical support, including AD8276BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8276BRZ requirements.
6.How does Aetrix verify that AD8276BRZ is sourced from the original manufacturer or authorized distributors?
All AD8276BRZ 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 AD8276BRZ meets industry standards.
7.What is the process for return or replacement of AD8276BRZ?
All AD8276BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8276BRZ, 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 AD8276BRZ part is unused and in its original packaging.
Return procedure for AD8276BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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