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Analog Devices Inc. AD8275ARMZ
- Part No.:
- AD8275ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8275ARMZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:188
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Product details
Overview
AD8275ARMZ from Analog Devices is a precision G = 0.2 difference amplifier designed as a level-translating ADC driver for ±10 V industrial signals into +4 V single-supply ADC ranges. It delivers 450 ns settling to 0.001%, 80 dB CMRR, rail-to-rail output, and operates from +3.3 V to +15 V - enabling direct interface to 16-bit SAR ADCs like AD7685 in data acquisition systems.
For engineers reviewing the AD8275ARMZ datasheet, AD8275ARMZ pinout, AD8275ARMZ application, or AD8275ARMZ equivalent, key selection criteria include input overvoltage tolerance (±35 V/±40 V), low gain drift (1 ppm/°C), reference flexibility (REF1/REF2 biasing), and verified performance driving switched-capacitor inputs without external buffers.
Technical Context
The AD8275ARMZ implements a laser-trimmed subtractor topology with internal matched resistors to achieve precise 0.2 gain and high common-mode rejection. Its input stage uses a 2.5 V internal bias referenced to −VS and dual 7 kΩ resistors to extend common-mode range beyond supply rails while avoiding crossover distortion.
It features adaptive current-output stage architecture optimized for SAR ADC kickback immunity, delivering consistent 20 V/µs slew rate and low THD+N (−106 dB) across load conditions. Reference configuration (shared vs. split REF1/REF2) directly determines output offset and linear input range - e.g., REF1 = GND / REF2 = 4.096 V yields 2.048 V mid-scale output for ±10 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | G = 0.2 (fixed attenuation ratio; translates ±10 V differential input to 4 V output span) |
| Settling Time | 450 ns to 0.001% (ensures full accuracy within typical 1 MSPS SAR ADC acquisition windows) |
| CMRR | 80 dB minimum at ±10 V common-mode (rejects noise in industrial sensor signal chains) |
| Rail-to-Rail Output | Swings to within 48 mV of −VS and 100 mV of +VS (maximizes dynamic range into 4–5 V ADC references) |
| Input Overvoltage | +40 V to −35 V (with VS = 5 V); enables direct connection to unprotected ±10 V field inputs |
| Gain Drift | 1 ppm/°C max (maintains calibration integrity across −40°C to +85°C industrial temperature range) |
| Supply Range | +3.3 V to +15 V single supply (supports wide system voltage architectures without dual-rail generation) |
Pinout & Package
AD8275ARMZ is housed in an 8-lead MSOP package (3 mm × 3 mm, 0.65 mm pitch), optimized for space-constrained industrial PCB layouts and thermal performance (θJA = 135°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF1 | Reference Input 1 | Bias node for output level translation; tied to GND in standard ±10 V → 4 V configurations |
| 2 - −IN | Negative Differential Input | Accepts −10 V to +12 V common-mode; ESD-protected to ±40 V relative to supplies |
| 3 - +IN | Positive Differential Input | Accepts −12.3 V to +12 V common-mode; matched impedance with −IN for CMRR |
| 4 - −VS | Negative Supply Rail | Ground reference in single-supply operation; internal bias generator tied to this pin |
| 5 - SENSE | Output Sense Feedback | Must be shorted to OUT pin to enable force-sense output regulation and maintain accuracy |
| 6 - OUT | Amplified Output | Low-impedance, rail-to-rail output; drives 2 kΩ loads with <0.001% settling in 450 ns |
| 7 - +VS | Positive Supply Rail | Accepts 3.3 V to 15 V; requires 0.1 µF + 10 µF bypassing per supply pin |
| 8 - REF2 | Reference Input 2 | Second bias node; set to 4.096 V for 2.048 V mid-scale output in ±10 V applications |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Precision Resistor Network | Laser-trimmed internal resistors ensure 0.024% gain error and 80 dB CMRR without external components |
| Extended Input Voltage Range | Operates with inputs up to +40 V above −VS and −35 V below +VS - eliminates need for external clamping |
| Adaptive Output Stage | Current-source-based output dynamically compensates for SAR ADC kickback, preserving THD and settling behavior |
| Flexible Reference Architecture | Dual REF1/REF2 pins support shared-reference (VOUT = VREF) or split-reference (VOUT = VREF/2) configurations |
| Low Drift Performance | 2.5 µV/°C offset drift and 1 ppm/°C gain drift maintain accuracy over full industrial temperature range |
Applications
| Industrial Data Acquisition | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Digitizing ±10 V outputs from strain gauges, RTDs, and process transmitters in PLC analog input modules. IC Role / Device Role / Timing Role: Level-translating front-end amplifier that converts bipolar field signals to unipolar ADC-compatible range while rejecting common-mode noise. Use Value: Eliminates need for external attenuators, level shifters, and dual-supply op amps - reducing BOM count and layout complexity. |
Use Scenario: Signal conditioning for benchtop multimeters and automated test equipment requiring 16-bit resolution on ±10 V inputs. IC Role / Device Role / Timing Role: High-fidelity ADC driver with fast settling and low distortion, synchronized to ADC sampling clock. Use Value: Enables −112 dB THD+N at 1 kHz when driving AD7685, meeting Class I metrology requirements without post-processing. |
| Programmable Logic Controller (PLC) I/O | Medical Instrumentation |
|
Use Scenario: Isolated analog input channel in modular PLC backplanes interfacing with legacy 0–10 V / ±10 V sensors. IC Role / Device Role / Timing Role: Robust signal translator tolerant of field-induced transients and ground loop offsets. Use Value: Withstands ±35 V input overvoltage and maintains 80 dB CMRR across −40°C to +85°C - ensuring long-term reliability in factory environments. |
Use Scenario: Front-end conditioning for patient-connected diagnostic devices digitizing biopotential or pressure signals. IC Role / Device Role / Timing Role: Precision difference amplifier providing galvanic isolation interface and safe voltage scaling before ADC. Use Value: Low 1 ppm/°C gain drift and 2.5 µV/°C offset drift preserve calibration stability between recalibrations required by IEC 62304. |
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 = 0.2 fixed gain, but only 500 kHz bandwidth and 1.5 µs settling time; no input overvoltage protection beyond ±15 V | Suitable for lower-speed, cost-sensitive applications where ±10 V translation is needed but fast settling is not critical | Select AD8276ARMZ only if bandwidth <500 kHz and input protection <±15 V are acceptable trade-offs for lower price |
| INA149IDR | Higher 200 V input common-mode range, but G = 1 and requires external gain-setting resistors; 10 µs settling time | Used in high-voltage isolation amplifiers (e.g., motor phase current sensing), not direct ±10 V → 4 V translation | Choose INA149IDR only when >100 V common-mode rejection is required - not a functional substitute for AD8275ARMZ's integrated level-shifting function |
Compared with AD8275ARMZ, AD8276ARMZ trades speed and ruggedness for cost, while INA149IDR addresses high-CMVR isolation rather than precision level translation - making AD8275ARMZ uniquely suited for 16-bit SAR ADC interfacing with ±10 V industrial signals.
Availability
AD8275ARMZ is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, and programmable logic controller I/O modules requiring stable component supply and guaranteed long-term availability.
Supply support for AD8275ARMZ 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 AD8275ARMZ belongs to Analog Devices' precision difference amplifier product line, engineered specifically to simplify ±10 V signal interfacing to single-supply ADCs in industrial and instrumentation systems.
FAQ
What is the primary function of the AD8275ARMZ?
The AD8275ARMZ is a fixed-gain (G = 0.2) difference amplifier designed to translate ±10 V differential input signals into a 0–4 V or ±2 V output range compatible with single-supply 16-bit SAR ADCs. Its integrated laser-trimmed resistor network, rail-to-rail output, and input overvoltage protection make it a complete, drop-in solution for industrial signal conditioning - eliminating external gain-setting components and level-shifting circuitry required by discrete op amp implementations.
Can AD8275ARMZ drive the AD7685 ADC directly?
Yes, AD8275ARMZ is explicitly characterized and validated to drive the AD7685 16-bit SAR ADC directly. The datasheet shows a reference design using a 33 Ω series resistor and 2.7 nF capacitor to manage switched-capacitor kickback, achieving −112 dB THD+N at 1 kHz. AD8275ARMZ's 450 ns settling time to 0.001% ensures full accuracy within the AD7685's acquisition window, and its low output impedance prevents gain error due to ADC input loading.
How do REF1 and REF2 pins affect AD8275ARMZ output level?
REF1 and REF2 determine the output DC offset: in split-reference mode (REF1 = GND, REF2 = VREF), output is biased at VREF/2; in shared-reference mode (REF1 = REF2 = VREF), output is biased at VREF. For ±10 V → 4.096 V full-scale translation, REF1 = GND and REF2 = 4.096 V yield a 2.048 V mid-scale output. Incorrect routing - such as adding series resistance - degrades CMRR and gain accuracy, so low-impedance drive is mandatory.
What is the maximum input voltage the AD8275ARMZ can tolerate?
With VS = 5 V, AD8275ARMZ tolerates +40 V at +IN/−IN relative to −VS and −35 V relative to +VS - i.e., input voltages from −35 V to +40 V. This is enabled by internal ESD diodes and does not require external protection. Exceeding these limits risks permanent damage. For higher transient immunity, external TransZorbs may be added, but series resistors are discouraged as they unbalance the precision resistor network and degrade CMRR.
Does AD8275ARMZ require external compensation capacitors?
No, AD8275ARMZ is internally compensated and stable driving capacitive loads up to 100 pF. The datasheet confirms stability with no external compensation under all specified operating conditions, including 2 kΩ resistive loads and 100 pF capacitive loads. Layout best practices - such as placing 0.1 µF ceramic and 10 µF tantalum bypass capacitors close to +VS/−VS pins - are sufficient to ensure robust performance without added compensation networks.
AD8275ARMZ 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:
- 25V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 15 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 1.9mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3.3 V
- Voltage - Supply Span (Max):
- 15 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8275ARMZ FAQ
1.How can I place an order for AD8275ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8275ARMZ 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 AD8275ARMZ reliable?
The price and inventory of AD8275ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8275ARMZ is usually 5 days.
3.What payment methods are accepted for AD8275ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8275ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8275ARMZ?
AD8275ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8275ARMZ 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 AD8275ARMZ?
For technical support, including AD8275ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8275ARMZ requirements.
6.How does Aetrix verify that AD8275ARMZ is sourced from the original manufacturer or authorized distributors?
All AD8275ARMZ 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 AD8275ARMZ meets industry standards.
7.What is the process for return or replacement of AD8275ARMZ?
All AD8275ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8275ARMZ, 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 AD8275ARMZ part is unused and in its original packaging.
Return procedure for AD8275ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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