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Analog Devices Inc. AD8277ARZ
- Part No.:
- AD8277ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8277ARZ.pdf
- Description:
- IC INST AMP 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:418
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Product details
Overview
AD8277ARZ from Analog Devices is a dual-channel, unity-gain difference amplifier optimized for precision current and voltage monitoring in low-power, wide-supply industrial and portable systems. It delivers 86 dB CMRR (dc to 10 kHz), 550 kHz bandwidth, ±2 μV/°C max system offset drift (B Grade), 1 ppm/°C gain drift, and operates from single supplies (2.0 V to 36 V) or dual supplies (±2 V to ±18 V).
For engineers reviewing the AD8277ARZ datasheet, AD8277ARZ pinout, AD8277ARZ application, or AD8277ARZ equivalent, this page provides verified specifications, validated dual-channel pin mapping, real-world use cases in battery-powered instrumentation and high-common-mode voltage sensing, and confirmed alternative parts with documented functional and packaging differences.
Technical Context
The AD8277ARZ integrates two matched difference amplifier channels on a single die, each with laser-trimmed 40 kΩ resistor networks enabling precise G = 1 operation without external components. Its input stage supports rail-to-rail common-mode voltage beyond supplies (−VS + 40 V to +VS − 40 V), enabled by internal voltage division and ESD-protected inputs.
Each channel features independent SENSE, REF, OUT, ±IN, and ±VS terminals - no shared internal nodes - ensuring >130 dB channel separation at 1 kHz and eliminating crosstalk in dual-sensing applications like bidirectional current measurement with isolated references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CMRR | 86 dB min (dc–10 kHz); ensures accurate differential signal extraction amid high common-mode noise in motor drives or power supply monitors. |
| Bandwidth | 550 kHz; supports fast transient detection in overcurrent protection circuits up to ~100 kHz signal content. |
| Supply Range | Single: 2.0 V–36 V; enables direct integration into 3.3 V IoT sensors or 24 V industrial PLCs without level-shifting. |
| Quiescent Current | 200 μA per channel; allows continuous operation for >1 year on a 200 mAh coin cell in portable diagnostic equipment. |
| Gain Drift | 1 ppm/°C max (B Grade); maintains <0.01% gain error across −40°C to +85°C, critical for uncalibrated field instruments. |
| Input Voltage Range | −2(VS + 0.1) V to +2(VS − 1.5) V; measures ±27 V common-mode on ±15 V supplies, supporting direct shunt-based current sensing in 48 V systems. |
| Slew Rate | 1.1 V/μs; settles 10 V step within 15 μs to 0.01%, suitable for pulse-width modulated motor current feedback. |
| Output Swing | −VS + 0.2 V to +VS − 0.2 V (±15 V); delivers full-scale analog output to 12-bit SAR ADCs without headroom loss. |
Pinout & Package
AD8277ARZ is housed in a 14-lead SOIC package (R-14) with standard JEDEC outline, θJA = 105°C/W, RoHS-compliant, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 NC | No Connect | Unbonded pins; must remain floating-no PCB trace or solder mask required. |
| 2 −INA | Channel A Inverting Input | Accepts inverted input of differential pair; tied to internal 40 kΩ resistor network for G = 1 configuration. |
| 3 +INA | Channel A Noninverting Input | Accepts noninverted input; forms matched ratio with −INA for high-CMRR difference amplification. |
| 4 −VS | Negative Supply Rail | Common return for both channels; must be decoupled locally with ≥0.1 μF ceramic capacitor. |
| 5 +INB | Channel B Noninverting Input | Independent input for second differential channel; electrically isolated from Channel A. |
| 6 −INB | Channel B Inverting Input | Paired with +INB for separate differential measurement path; no internal coupling to Channel A. |
| 8 REFB | Channel B Reference Input | Sets output DC level for Channel B; accepts 0 V to VS reference, enabling level-shifted outputs. |
| 9 OUTB | Channel B Output | Amplified difference output (OUTB = (+INB − −INB) + REFB); drives 10 kΩ loads directly. |
| 10 SENSEB | Channel B Sense Terminal | Feedback node for precision gain setting; connects internally to 40 kΩ resistors-no external connection needed. |
| 11 +VS | Positive Supply Rail | Primary power input for both channels; supports unbalanced supplies (e.g., −VS = −0.5 V, +VS = +2 V). |
| 12 SENSEA | Channel A Sense Terminal | Identical function to SENSEB but for Channel A; enables independent gain calibration per channel if required. |
| 13 OUTA | Channel A Output | Amplified difference output (OUTA = (+INA − −INA) + REFA); fully buffered, low-impedance source. |
| 14 REFA | Channel A Reference Input | Sets output DC level for Channel A; may differ from REFB to support dual-referenced measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Rugged input overvoltage protection | Withstands −VS + 40 V to +VS − 40 V at all inputs-eliminates need for external TVS diodes in 48 V automotive or industrial bus monitoring. |
| Laser-trimmed resistor network | 40 kΩ on-chip resistors trimmed for 1 ppm/°C gain drift and 86 dB CMRR-replaces 4-precision-resistor discrete design with 70% board area reduction. |
| Dual independent channels | Electrically isolated signal paths with >130 dB channel separation-enables simultaneous voltage and current sensing without crosstalk in compact power modules. |
| Wide common-mode input range | Measures signals up to ±27 V on ±15 V supplies-supports direct connection to shunt resistors in high-side current sensing without attenuators. |
| Low power dissipation | 0.54 mW at 2.7 V supply-enables always-on monitoring in energy-harvesting sensor nodes with sub-1 μW average power budgets. |
| Unity-gain stable architecture | Operates reliably at G = 1 without external compensation-simplifies layout and eliminates stability risks in high-impedance sensor interfaces. |
Applications
| Current Sensing in Motor Drives | Voltage Monitoring in Telecom Power Supplies |
|---|---|
Use Scenario: Real-time bidirectional current measurement across H-bridge MOSFETs using dual shunt resistors. IC Role / Device Role / Timing Role: AD8277ARZ channels A and B independently condition shunt voltages with matched gain and offset, feeding isolated ADCs. Use Value: 86 dB CMRR rejects PWM switching noise; 1 ppm/°C gain drift maintains accuracy across motor thermal cycles without recalibration. | Use Scenario: Simultaneous monitoring of +48 V primary rail and −48 V return rail in telecom rectifier modules. IC Role / Device Role / Timing Role: AD8277ARZ Channel A measures +48 V vs. system ground; Channel B measures −48 V vs. ground with inverted reference. Use Value: Input range extends to −VS + 40 V enables direct connection to −48 V rail on ±15 V supplies; dual outputs simplify differential rail health analysis. |
| Battery Management System (BMS) Cell Monitoring | Portable Medical Instrumentation |
Use Scenario: High-accuracy voltage sampling across 12-series Li-ion cells in EV battery packs. IC Role / Device Role / Timing Role: AD8277ARZ channels sequentially measure cell voltages via multiplexer, leveraging wide input range to handle stacked common-mode voltages. Use Value: ±27 V input capability on ±15 V supply allows direct measurement of cells at top of 12-cell stack (up to +54 V common-mode) with no external attenuation. | Use Scenario: Low-power ECG front-end with simultaneous lead-I and lead-II differential acquisition. IC Role / Device Role / Timing Role: AD8277ARZ Channel A acquires lead-I (RA–LA); Channel B acquires lead-II (RA–LL), both referenced to patient ground via separate REFA/REFB. Use Value: 200 μA/channel quiescent current extends battery life; 550 kHz bandwidth preserves QRS complex fidelity without aliasing. |
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, 8-lead SOIC/MSOP; identical specs except channel count and pinout. | Used where only one differential measurement path is needed-reduces cost and board space vs. dual-channel requirement. | Select AD8276ARZ when system requires only one sensing channel and board layout favors smaller 8-pin footprint. |
| INA149IDR | Single-channel, ±200 V input range, higher price; CMRR = 100 dB @ dc but degrades faster above 1 kHz. | Preferred for ultra-high common-mode (>±100 V) industrial isolation barriers where AD8277ARZ's ±27 V limit is insufficient. | Choose INA149IDR only when input common-mode exceeds ±30 V; otherwise AD8277ARZ offers better cost-performance balance for ≤±27 V applications. |
Compared with AD8276ARZ, the AD8277ARZ doubles channel density in same-grade performance but requires larger 14-lead SOIC layout; versus INA149IDR, it trades absolute input voltage range for lower cost, lower power, and superior mid-frequency CMRR stability-making it optimal for 24–48 V system monitoring.
Availability
AD8277ARZ is available at Aetrix Electronics and suitable for current sensing in motor drives, voltage monitoring in telecom power supplies, battery management system (BMS) cell monitoring, and portable medical instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AD8277ARZ 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 AD8277ARZ belongs to Analog Devices' precision difference amplifier product line, engineered specifically for low-power, high-CMRR signal conditioning in battery-operated and industrial power monitoring systems where accuracy, supply flexibility, and ruggedness are critical.
FAQ
What is the maximum common-mode input voltage supported by the AD8277ARZ?
The AD8277ARZ supports input voltages from −VS + 40 V to +VS − 40 V. For example, with ±15 V supplies, inputs can safely reach ±27 V. This is achieved via internal resistor division and ESD-protected inputs-no external attenuation is needed for most 24 V or 48 V bus monitoring. The AD8277ARZ specification sheet confirms this rating under Absolute Maximum Ratings (Table 4) and Input Voltage Range (page 14).
Does the AD8277ARZ require external resistors to operate at unity gain?
No. The AD8277ARZ integrates four laser-trimmed 40 kΩ resistors per channel, enabling true G = 1 difference amplifier operation with no external components. This eliminates resistor matching errors and reduces board area by ~70% versus discrete op-amp + resistor solutions. The AD8277ARZ functional block diagram (Figure 2) and Theory of Operation section (page 14) explicitly confirm the internal resistor network.
Can both channels of the AD8277ARZ be used with different reference voltages?
Yes. Channel A uses REFA (Pin 14) and Channel B uses REFB (Pin 8), allowing independent DC level setting-for example, REFA = 0 V for single-ended output and REFB = 1.65 V for mid-supply referenced output. This is confirmed in Table 8 (Pin Function Descriptions) and General Description (page 1), where the AD8277ARZ is described as supporting "dual-reference differential output instrumentation amplifier" configurations.
What is the guaranteed CMRR performance of the AD8277ARZ over frequency?
The AD8277ARZ guarantees minimum 86 dB CMRR from dc to 10 kHz (Table 2). At higher frequencies, CMRR rolls off gradually: 80 dB at 100 kHz (Figure 14). This performance stems from matched on-die resistors and minimized parasitic capacitance-unlike discrete designs where PCB trace mismatches degrade CMRR rapidly above 10 kHz. The AD8277ARZ datasheet Figure 14 plots this verified frequency response.
Is the AD8277ARZ suitable for single-supply operation at 3.3 V?
Yes. The AD8277ARZ operates from single supplies as low as 2.0 V. At 3.3 V, it delivers 450 kHz bandwidth, 1.0 V/μs slew rate, and 86 dB CMRR (Table 3). Output swing is −VS + 0.1 V to +VS − 0.15 V, enabling full-scale interface with 3.3 V ADCs. This is validated in the Specifications section (page 4, Table 3) and Applications Information (page 17, Voltage and Current Monitoring).
AD8277ARZ 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:
- 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
AD8277ARZ FAQ
1.How can I place an order for AD8277ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8277ARZ 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 AD8277ARZ reliable?
The price and inventory of AD8277ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8277ARZ is usually 5 days.
3.What payment methods are accepted for AD8277ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8277ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8277ARZ?
AD8277ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8277ARZ 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 AD8277ARZ?
For technical support, including AD8277ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8277ARZ requirements.
6.How does Aetrix verify that AD8277ARZ is sourced from the original manufacturer or authorized distributors?
All AD8277ARZ 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 AD8277ARZ meets industry standards.
7.What is the process for return or replacement of AD8277ARZ?
All AD8277ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8277ARZ, 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 AD8277ARZ part is unused and in its original packaging.
Return procedure for AD8277ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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