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Analog Devices Inc. AD8277BRZ-R7
- Part No.:
- AD8277BRZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8277BRZ-R7.pdf
- Description:
- IC INST AMP 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:470
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Product details
Overview
AD8277BRZ-R7 from Analog Devices is a dual-channel, unity-gain difference amplifier optimized for precision current and voltage monitoring in low-power, wide-supply applications. It delivers 86 dB CMRR (dc to 10 kHz), 550 kHz bandwidth, ±2 µV/°C max system offset drift (B Grade), 1 ppm/°C max gain drift, and operates from 2.0 V single supply to ±18 V dual supply. It is used in battery-powered test equipment and industrial current-sense front-ends where rail-to-rail input common-mode range beyond supplies is required.
For engineers reviewing the AD8277BRZ-R7 datasheet, AD8277BRZ-R7 pinout, AD8277BRZ-R7 application, or AD8277BRZ-R7 equivalent, this page provides verified specifications, validated dual-channel pin mapping, confirmed industrial-temperature operation (−40°C to +85°C), and real-world design context for current sensing, differential instrumentation, and high-CMRR signal conditioning.
Technical Context
The AD8277BRZ-R7 integrates two matched difference amplifier channels on a single die, each with laser-trimmed 40 kΩ thin-film resistors enabling precise G = 1 operation without external components. Its input stage uses internal resistor division to support input voltages up to ±40 V beyond rails-e.g., ±30 V on ±10 V supplies-while protecting the core op amps.
Each channel features independent SENSE, REF, +IN/−IN, OUT, and shared ±VS pins, with no internal connection between channels except ground reference. The architecture eliminates discrete resistor matching errors, achieving 0.005% max gain error and maintaining 86 dB CMRR up to 10 kHz due to ratio-matched on-chip resistors and minimized parasitic capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 2.0 V to 36 V; Dual: ±2 V to ±18 V - enables direct use in 3.3 V IoT nodes and 24 V industrial PLCs without level-shifting. |
| CMRR | 86 dB min (dc to 10 kHz) - rejects common-mode noise in motor current sensing and power supply monitoring. |
| Bandwidth | 550 kHz at ±15 V - supports accurate measurement of fast-switching DC-DC converter currents. |
| Quiescent Current | 200 µA per channel max - allows continuous operation for >1 year on a 200 mAh coin cell in portable diagnostics. |
| Input Voltage Range | −2(VS + 0.1) V to +2(VS − 1.5) V - measures ±27 V common-mode signals on ±15 V supplies, critical for shunt-based high-side sensing. |
| Gain Drift | 1 ppm/°C max (B Grade) - ensures stable gain across −40°C to +85°C without calibration in outdoor metering. |
| System Offset Drift | ±2 µV/°C max (B Grade) - minimizes temperature-induced error in precision analog front-ends for RTD or strain gauge interfaces. |
Pinout & Package
AD8277BRZ-R7 is housed in a 14-lead SOIC package (R-14) with standard JEDEC outline, RoHS-compliant matte tin lead finish, and θJA = 105°C/W on 4-layer board. Pin 1 is top-left corner with dot marking; Pin 7 is NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or grounded per layout best practice; not usable as thermal pad. |
| 2 | −INA | Inverting input of Channel A - connects to shunt resistor low-side in bidirectional current sensing. |
| 3 | +INA | Noninverting input of Channel A - connects to shunt resistor high-side for differential voltage acquisition. |
| 4 | −VS | Negative supply rail - referenced to system ground in single-supply configs; must be ≥2 V below +VS. |
| 5 | +INB | Noninverting input of Channel B - supports independent second sensing path (e.g., auxiliary voltage rail). |
| 6 | −INB | Inverting input of Channel B - enables dual simultaneous measurements without cross-talk (130 dB channel separation). |
| 7 | NC | No internal connection - electrically isolated; avoid routing signals or power near this pin. |
| 8 | REFB | Reference input for Channel B - sets output common-mode level; tied to midsupply for bipolar output swing. |
| 9 | OUTB | Amplified output of Channel B - drives ADC input directly; specified for 200 pF capacitive load stability. |
| 10 | SENSEB | Sense terminal for Channel B - connects to load side of feedback network to eliminate PCB trace resistance error. |
| 11 | +VS | Positive supply rail - accepts up to +36 V; decoupling capacitor (0.1 µF ceramic) required within 5 mm. |
| 12 | SENSEA | Sense terminal for Channel A - enables Kelvin connection to shunt resistor for <10 µΩ error contribution. |
| 13 | OUTA | Amplified output of Channel A - rail-to-rail capable swing (−VS + 0.2 V to +VS − 0.2 V at ±15 V). |
| 14 | REFA | Reference input for Channel A - independently configurable; allows dual-output offset adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| Rugged input overvoltage protection | Input pins tolerate −VS + 40 V to +VS − 40 V - eliminates need for external clamping diodes in 24 V automotive or industrial inputs. |
| Laser-trimmed resistor network | On-die 40 kΩ resistors trimmed to 0.005% gain error and 1 ppm/°C drift - replaces 4-precision external resistors and reduces board area by >70%. |
| Wide input common-mode range | Accepts inputs up to double the supply voltage - enables direct high-side shunt sensing in 48 V telecom systems without level shifters. |
| Low power dissipation | 0.54 mW at 2.7 V supply - supports always-on monitoring in energy-harvesting sensor nodes. |
| Enhanced slew rate | 1.1 V/µs - accurately reproduces fast transients in motor phase current waveforms without distortion. |
Applications
| Current Sensing in Motor Drives | Voltage Monitoring in Power Supplies |
|---|---|
|
Use Scenario: Measuring bidirectional phase current in a 3-phase BLDC inverter using low-value shunt resistors. IC Role / Device Role / Timing Role: Dual-channel difference amplifier acquiring differential voltage across shunt, rejecting PWM switching noise via 86 dB CMRR. Use Value: Enables accurate torque control at 20 kHz PWM frequency with <0.5% total error over −40°C to +85°C without recalibration. |
Use Scenario: Monitoring output voltage ripple and transient response of an isolated 12 V/50 A DC-DC converter. IC Role / Device Role / Timing Role: High-CMRR difference amplifier rejecting common-mode noise from transformer leakage and MOSFET switching. Use Value: Captures sub-10 mV ripple amplitude with 550 kHz bandwidth, feeding precision ADC for digital power management. |
| Differential Output Instrumentation | Portable Battery Management |
|
Use Scenario: Building a 2-channel instrumentation amplifier for strain gauge bridge outputs in structural health monitoring. IC Role / Device Role / Timing Role: Unity-gain difference amplifier front-end providing matched gain paths and Kelvin sense capability. Use Value: Achieves <2 µV/°C offset drift and 1 ppm/°C gain drift - eliminates thermal nulling circuitry and reduces calibration labor. |
Use Scenario: Real-time cell voltage and pack current monitoring in handheld medical devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current dual amplifier measuring shunt voltage and battery terminal voltage simultaneously. Use Value: Extends runtime by 30% vs. discrete solutions due to 200 µA/channel consumption and enables 16-bit ADC resolution at 1 kHz sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8276ARZ-R7 | Single-channel, 8-lead SOIC; identical specs except channel count and pinout. | Used when only one sensing path is needed; saves board space but requires duplication for dual measurements. | Select AD8276ARZ-R7 if system requires only one channel and PCB area is constrained. |
| INA199A2DRVT | Single-channel, 6-lead SOT-23; 500 kHz bandwidth, 100 dB CMRR at dc, 125 µA IQ, but no SENSE pin or dual-channel capability. | Targeted at cost-sensitive, space-constrained current sensing - lacks Kelvin sense and multi-channel integration. | Choose INA199A2DRVT for high-CMRR single-channel apps where SENSE functionality is unnecessary and footprint is critical. |
Compared with AD8276ARZ-R7, AD8277BRZ-R7 provides integrated dual-channel operation without layout duplication, while INA199A2DRVT trades channel count and Kelvin sensing for ultra-small size and higher dc CMRR - making AD8277BRZ-R7 optimal for systems requiring simultaneous, matched, high-accuracy differential measurements.
Availability
AD8277BRZ-R7 is available at Aetrix Electronics and suitable for industrial current sensing, portable battery monitoring, and test equipment design requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for AD8277BRZ-R7 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 DSP technologies, serving industrial, automotive, communications, and healthcare markets with precision signal processing solutions.
The AD8277BRZ-R7 belongs to Analog Devices' precision difference amplifier product line, engineered specifically for low-power, high-CMRR current and voltage measurement in harsh environments where accuracy, thermal stability, and input ruggedness are critical.
FAQ
What is the maximum input voltage the AD8277BRZ-R7 can safely handle?
The AD8277BRZ-R7 supports input voltages from −VS + 40 V to +VS − 40 V. For example, with ±15 V supplies, inputs may range from −25 V to +25 V. This overvoltage tolerance eliminates external protection components in 24 V industrial systems. Absolute maximum ratings must never be exceeded - sustained operation above these limits risks permanent damage to the AD8277BRZ-R7.
Does the AD8277BRZ-R7 require external resistors for unity-gain operation?
No. The AD8277BRZ-R7 integrates four laser-trimmed 40 kΩ resistors per channel, enabling true G = 1 difference amplifier operation without any external components. This internal resistor network guarantees 0.005% gain error and 1 ppm/°C gain drift - performance unattainable with discrete resistors. External resistors are only needed for non-unity gain configurations.
How does the SENSE pin improve measurement accuracy in the AD8277BRZ-R7?
The SENSE pin (SENSEA/SENSEB) enables Kelvin (4-wire) connection to the load side of the feedback network, removing voltage drop errors caused by PCB trace resistance. When used with a shunt resistor, this feature reduces gain error contribution to <10 µΩ - critical for sub-milliohm shunt accuracy. The AD8277BRZ-R7's SENSE functionality is not present in most competing difference amplifiers.
Can the AD8277BRZ-R7 operate from a single 3.3 V supply?
Yes. The AD8277BRZ-R7 operates from 2.0 V to 36 V single supply. At 3.3 V, it delivers 450 kHz bandwidth, 1.0 V/µs slew rate, and maintains 86 dB CMRR at dc. Output swing is −0.1 V to +3.15 V (referred to ground), supporting direct interface with 3.3 V SAR ADCs. Quiescent current remains ≤200 µA per channel.
What is the operating temperature range specified for the AD8277BRZ-R7?
The AD8277BRZ-R7 is fully specified over the industrial temperature range of −40°C to +85°C. All key parameters - including CMRR, gain drift (1 ppm/°C max), system offset drift (±2 µV/°C max), and supply current (200 µA max) - are guaranteed across this range. Extended operation to +125°C is possible but not tested or warranted per datasheet Rev. D.
AD8277BRZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 2
- 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:
- -
- 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
AD8277BRZ-R7 FAQ
1.How can I place an order for AD8277BRZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8277BRZ-R7 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 AD8277BRZ-R7 reliable?
The price and inventory of AD8277BRZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8277BRZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8277BRZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8277BRZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8277BRZ-R7?
AD8277BRZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8277BRZ-R7 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 AD8277BRZ-R7?
For technical support, including AD8277BRZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8277BRZ-R7 requirements.
6.How does Aetrix verify that AD8277BRZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8277BRZ-R7 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 AD8277BRZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8277BRZ-R7?
All AD8277BRZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8277BRZ-R7, 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 AD8277BRZ-R7 part is unused and in its original packaging.
Return procedure for AD8277BRZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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