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Analog Devices Inc. AD8278BRMZ
- Part No.:
- AD8278BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8278BRMZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,534
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Product details
Overview
AD8278BRMZ from Analog Devices is a precision, low-power difference amplifier with fixed gain options of G = ½ or G = 2, designed for high-accuracy signal conditioning in power-constrained systems. It delivers 80 dB CMRR (dc to 20 kHz), 1 MHz bandwidth at G = ½, and operates from single supplies as low as 2.0 V up to 36 V - enabling use in battery-powered current/voltage monitoring circuits.
For engineers reviewing the AD8278BRMZ datasheet, AD8278BRMZ pinout, AD8278BRMZ application, or AD8278BRMZ equivalent, key selection criteria include input common-mode range extending beyond rails (up to ±3× supply), laser-trimmed on-chip resistors for gain accuracy, rugged input overvoltage protection, and ultra-low 200 μA quiescent current per channel.
Technical Context
The AD8278BRMZ integrates matched thin-film resistors and ESD-protected inputs to enable wide-input-range differential amplification without external components. Its internal architecture supports both G = ½ and G = 2 configurations while maintaining high CMRR via ratio-matched resistor networks.
It features rail-to-rail output swing capability (−VS + 0.2 V to +VS − 0.2 V at ±15 V), enhanced slew rate of 1.4 V/μs, and operates across −40°C to +125°C. Input voltage range scales with supply: up to ±3(VS − 1.5 V) for G = ½, making it suitable for high-common-mode industrial sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Options | G = ½ or G = 2 - fixed-ratio internal resistor network eliminates external gain-setting components and ensures stable, temperature-invariant performance. |
| CMRR (G = ½) | 80 dB min (dc to 20 kHz) - enables accurate measurement of small differential signals riding on large common-mode voltages (e.g., shunt-based current sensing). |
| Supply Current | 200 μA max per channel - allows continuous operation in multi-year battery-powered instrumentation without compromising precision. |
| Input Voltage Range | −3(VS + 0.1 V) to +3(VS − 1.5 V) for G = ½ - supports direct connection to high-side shunts or motor phase terminals without level-shifting circuitry. |
| Bandwidth | 1 MHz at G = ½ - sufficient for fast transient detection in motor control feedback loops and power supply monitoring. |
| Offset Drift | ±1 μV/°C max (B Grade) - minimizes calibration drift over temperature in portable test equipment and medical sensors. |
| Package | 8-lead MSOP - compact footprint ideal for space-constrained PCB layouts in handheld meters and IoT edge nodes. |
Pinout & Package
The AD8278BRMZ is housed in an 8-lead MSOP package (3 mm × 3 mm, 0.85 mm height) with exposed pad for thermal enhancement. Pin 1 is REF; pins 2 and 3 are −IN and +IN; pin 4 is −VS; pin 5 is SENSE; pin 6 is OUT; pin 7 is +VS; and pin 8 is NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Voltage Input | Sets output common-mode level; tied to ground or midsupply to define output DC offset point. |
| 2 (−IN) | Inverting Input | One side of differential input pair; accepts high-common-mode voltage signals up to ±3× supply rails. |
| 3 (+IN) | Noninverting Input | Second side of differential input pair; used with −IN to reject common-mode noise in noisy industrial environments. |
| 4 (−VS) | Negative Supply | Ground reference for dual-supply operation or negative rail in split-supply configurations. |
| 5 (SENSE) | Sense Terminal | Provides Kelvin connection to load or shunt resistor to eliminate trace resistance errors in precision current measurement. |
| 6 (OUT) | Output | Single-ended amplified output; drives 10 kΩ loads with rail-to-rail swing and <9 μs settling to 0.01%. |
| 7 (+VS) | Positive Supply | Primary power rail; supports 2.0 V to 36 V single supply or ±2 V to ±18 V dual supply operation. |
| 8 (NC) | No Connect | Internally unconnected; must remain floating and not tied to any net to avoid parametric degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input common-mode range | Extends beyond supply rails (e.g., ±27 V at ±15 V supply), eliminating need for external attenuators or level shifters in high-voltage sensing. |
| Laser-trimmed internal resistors | Ensures 0.02% max gain error and 1 ppm/°C gain drift - critical for factory-calibrated measurement systems requiring long-term stability. |
| Rugged input overvoltage protection | Withstands −VS + 40 V to +VS − 40 V at inputs - protects against transients during hot-plug events or fault conditions in motor drives. |
| Low power dissipation | 0.5 mW at VS = 2.5 V - enables integration into always-on sensor nodes without thermal derating concerns. |
| Enhanced slew rate | 1.4 V/μs - supports accurate amplification of fast-changing signals such as PWM current waveforms in Class-D audio or BLDC motor commutation. |
Applications
| Voltage Measurement and Monitoring | Current Measurement and Monitoring |
|---|---|
Use Scenario: Monitoring bus voltage in 24 V industrial PLC I/O modules under varying load and temperature conditions. IC Role / Device Role / Timing Role: Difference amplifier configured at G = ½ to scale high-side shunt voltage to ADC input range while rejecting common-mode ripple. Use Value: Enables direct measurement of 0–30 V rail with ±100 μV system offset and <0.02% gain error - reducing calibration overhead and improving long-term accuracy. | Use Scenario: Bidirectional current sensing in battery management systems for EV charging stations. IC Role / Device Role / Timing Role: High-side current monitor using SENSE and REF pins to achieve Kelvin-connected, low-drift amplification of millivolt-level shunt signals. Use Value: Delivers ±1 μV/°C offset drift and 80 dB CMRR up to 20 kHz - ensuring accurate charge/discharge current tracking despite high dv/dt noise from switching converters. |
| Portable, Battery-Powered Equipment | Test and Measurement |
Use Scenario: Precision multimeter front-end for measuring microamp-level leakage currents in handheld field testers. IC Role / Device Role / Timing Role: Low-power difference amplifier operating from coin-cell supply (2.7 V) with G = 2 configuration to maximize signal-to-noise ratio. Use Value: Draws only 200 μA at 2.7 V while delivering 450 kHz bandwidth and 94 nV/√Hz noise - extending battery life to >1 year without sacrificing resolution. | Use Scenario: Signal conditioning stage in benchtop oscilloscope auxiliary input channels for differential probe interfaces. IC Role / Device Role / Timing Role: Fixed-gain building block for instrumentation amplifier stages requiring stable gain, low distortion, and minimal board area. Use Value: Laser-trimmed resistors and 130 dB channel separation eliminate inter-channel crosstalk and maintain gain accuracy across temperature - simplifying system-level calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8276ARMZ | G = ½ only; same 200 μA supply current but lower CMRR (70 dB typical) and no SENSE pin for Kelvin sensing. | Less suited for high-precision current measurement where input trace resistance affects accuracy. | Select AD8276ARMZ when cost is prioritized over CMRR and Kelvin sensing is unnecessary. |
| INA199A1DCKR | Single-supply only (2.7–26 V); higher gain drift (10 ppm/°C), no dual-supply support, and smaller input common-mode range (−0.3 V to +26 V). | Not viable for ±15 V systems or applications requiring extended common-mode rejection beyond rails. | Choose INA199A1DCKR only for low-voltage, single-rail designs where ultra-low offset is secondary to integration density. |
Compared with AD8276ARMZ and INA199A1DCKR, the AD8278BRMZ uniquely combines dual-supply flexibility, rail-exceeding input range, Kelvin SENSE capability, and B-grade temperature stability - making it the preferred choice for high-accuracy, wide-supply industrial and portable instrumentation.
Availability
AD8278BRMZ is available at Aetrix Electronics and suitable for voltage measurement and monitoring, current measurement and monitoring, and portable, battery-powered equipment requiring stable component supply and long-term parametric consistency.
Supply support for AD8278BRMZ 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The AD8278 is part of Analog Devices' precision difference amplifier product line, engineered for low-power, high-CMRR signal conditioning in applications demanding accuracy, ruggedness, and supply flexibility - especially where space, power, and thermal constraints limit discrete solutions.
FAQ
What is the maximum input common-mode voltage supported by the AD8278BRMZ?
The AD8278BRMZ supports input common-mode voltages up to ±3(VS − 1.5 V) in G = ½ configuration - for example, ±27 V at ±15 V supplies. This rail-exceeding range is enabled by internal ESD protection and robust input stage design, allowing direct interface with high-side shunts or motor phase terminals without attenuation. The AD8278BRMZ maintains 80 dB CMRR across this full range.
Does the AD8278BRMZ require external resistors to set gain?
No, the AD8278BRMZ does not require external resistors to set gain. It integrates laser-trimmed thin-film resistors to provide precise, factory-set gains of G = ½ or G = 2. This eliminates gain-setting errors from external component tolerances and temperature drift, ensuring 0.02% max gain error and 1 ppm/°C gain drift - critical for calibrated measurement systems where repeatability matters.
Can the AD8278BRMZ operate from a single 3.3 V supply?
Yes, the AD8278BRMZ operates from single supplies as low as 2.0 V, including 3.3 V. At 3.3 V, it delivers 870 kHz bandwidth (G = ½), 1.3 V/μs slew rate, and 200 μA supply current. Output swing is specified as −VS + 0.1 V to +VS − 0.15 V, enabling full-scale utilization of 3.3 V ADCs. Performance data for 2.7 V and 5 V supplies is explicitly validated in the AD8278BRMZ datasheet Rev. C.
What is the purpose of the SENSE pin on the AD8278BRMZ?
The SENSE pin on the AD8278BRMZ provides a Kelvin connection point for the load or shunt resistor, enabling four-terminal sensing that cancels voltage drop errors caused by PCB trace resistance. When used with the REF pin, it ensures the amplifier measures only the true differential voltage across the sense element - essential for sub-millivolt accuracy in precision current monitoring applications like battery fuel gauging or motor phase current feedback.
Is the AD8278BRMZ RoHS compliant and qualified for industrial temperature range?
Yes, the AD8278BRMZ is fully RoHS compliant and specified for operation across the industrial temperature range of −40°C to +85°C. Its guaranteed performance parameters - including 200 μA max supply current, 80 dB CMRR, and ±100 μV system offset - are validated over this full range. The device also supports extended operation up to +125°C for junction temperature, with thermal resistance of 135°C/W in the MSOP package.
AD8278BRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.4V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 50 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-MSOP
AD8278BRMZ FAQ
1.How can I place an order for AD8278BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8278BRMZ 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 AD8278BRMZ reliable?
The price and inventory of AD8278BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8278BRMZ is usually 5 days.
3.What payment methods are accepted for AD8278BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8278BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8278BRMZ?
AD8278BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8278BRMZ 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 AD8278BRMZ?
For technical support, including AD8278BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8278BRMZ requirements.
6.How does Aetrix verify that AD8278BRMZ is sourced from the original manufacturer or authorized distributors?
All AD8278BRMZ 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 AD8278BRMZ meets industry standards.
7.What is the process for return or replacement of AD8278BRMZ?
All AD8278BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8278BRMZ, 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 AD8278BRMZ part is unused and in its original packaging.
Return procedure for AD8278BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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