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Analog Devices Inc. AD8275BRMZ
- Part No.:
- AD8275BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8275BRMZ.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:387
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Product details
Overview
AD8275BRMZ 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 input ranges. It delivers 450 ns settling to 0.001%, 80 dB CMRR, rail-to-rail output swing, and drives 16-bit SAR ADCs such as the AD7685 in data acquisition systems.
For engineers reviewing the AD8275BRMZ datasheet, AD8275BRMZ pinout, AD8275BRMZ application, or AD8275BRMZ equivalent, key selection criteria include input overvoltage tolerance (±35 V to ±40 V), low gain drift (1 ppm/°C), reference flexibility (split/shared REF1/REF2), and fast settling under capacitive load - all critical when interfacing high-voltage sensors to precision converters.
Technical Context
The AD8275BRMZ implements a laser-trimmed resistor-based subtractor topology that simultaneously attenuates (×0.2), level-shifts, and converts differential inputs to single-ended outputs. Its internal 2.5 V bias and matched 7 kΩ resistors extend common-mode range without crossover distortion, enabling linear operation from −12.3 V to +12 V with ±2.5 V supplies.
It features adaptive output-stage current sourcing/sinking to absorb SAR ADC kickback, ensuring stable THD (−112 dB) and consistent bandwidth (15 MHz small-signal BW) across temperature (−40°C to +85°C) and supply voltage (3.3 V to 15 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed G = 0.2 (attenuates ±10 V input to 0–4 V output range) |
| Settling Time | 450 ns to 0.001% - meets acquisition window of 1 MSPS 16-bit SAR ADCs |
| CMRR | 80 dB minimum - rejects common-mode noise from long sensor cables |
| Input Overvoltage | +40 V / −35 V (at VS = 5 V) - protects against transients in industrial environments |
| Rail-to-Rail Output | Swings within 48 mV of −VS and 100 mV of +VS - maximizes dynamic range into ADC |
| Gain Drift | 1 ppm/°C max - ensures stable scaling across temperature in precision measurement |
| Supply Range | +3.3 V to +15 V single supply - supports low-power and high-voltage system designs |
Pinout & Package
AD8275BRMZ 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 | Sets lower reference level; tied to GND in split-reference configurations to bias output midpoint |
| 2 - −IN | Negative Input | Differential input node; ESD-protected to ±35 V/±40 V beyond rails |
| 3 - +IN | Positive Input | Differential input node; matched impedance with −IN enables high CMRR |
| 4 - −VS | Negative Supply | Ground or negative rail connection; internal bias referenced to this pin |
| 5 - SENSE | Output Sense | Must be shorted to OUT to enable force-sense output regulation and maintain accuracy |
| 6 - OUT | Amplified Output | Single-ended, rail-to-rail output driving ADC input; low output impedance (<1 Ω) |
| 7 - +VS | Positive Supply | Main power rail; bypassing with 0.1 µF + 10 µF required for stability |
| 8 - REF2 | Reference Input | Sets upper reference level; tied to VREF in split-reference mode to define output offset |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | 0.024% gain error and 80 dB CMRR - eliminates external trimming in production |
| Adaptive output stage | Suppresses SAR ADC kickback without external isolation resistors - preserves THD |
| Extended input common-mode range | −12.3 V to +12 V at 5 V supply - interfaces directly with ±10 V sensors without attenuation |
| Low offset drift | 2.5 µV/°C - maintains DC accuracy in unregulated industrial enclosures |
| Fast overload recovery | 300 ns - recovers cleanly after transient overdrive, preventing ADC saturation errors |
Applications
| Industrial Data Acquisition | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Conditioning ±10 V analog outputs from PLC I/O modules before digitization by 16-bit SAR ADCs. IC Role / Device Role / Timing Role: Level-translating difference amplifier with fixed 0.2 gain and rail-to-rail output. Use Value: Eliminates need for external attenuators and op-amp buffers, reducing BOM count and layout area while maintaining 16-bit linearity. | Use Scenario: Driving multiple channels of high-precision DMM or waveform digitizer front ends requiring matched gain and offset performance. IC Role / Device Role / Timing Role: Precision ADC driver with 450 ns settling and low THD (−112 dB). Use Value: Enables synchronized multi-channel sampling at 1 MSPS without inter-channel crosstalk or settling-induced code errors. |
| Instrumentation Amplifier Front End | High-Voltage Sensor Interface |
Use Scenario: Serving as the first-stage gain block in a modular instrumentation amplifier, accepting wide common-mode inputs before programmable gain stages. IC Role / Device Role / Timing Role: High-CMRR (80 dB), low-drift (1 ppm/°C) difference amplifier with configurable reference pins. Use Value: Provides stable, factory-calibrated attenuation and level shift - simplifies calibration of downstream variable-gain stages. | Use Scenario: Interfacing ±10 V strain gauge or thermocouple signal conditioners to isolated 3.3 V microcontroller ADCs. IC Role / Device Role / Timing Role: Single-supply level translator with ±35 V input overvoltage protection and 3.3 V–15 V supply flexibility. Use Value: Survives field wiring faults and ESD events without latch-up, reducing field return rates in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8270ARMZ | G = 1, 10, 100 selectable; no integrated reference divider; higher gain error (0.05%) | Requires external REF circuitry for level translation; better for variable-gain, not fixed-attenuation use cases | Select AD8270ARMZ only if programmable gain and wider supply range (±18 V) outweigh need for integrated ±10 V → 4 V translation. |
| INA149AIDR | G = 1; 200 V common-mode range; higher input impedance (5 MΩ); no rail-to-rail output | Designed for direct high-voltage differential sensing (e.g., motor phase currents), not ADC-level translation | Choose INA149AIDR when measuring >±12 V differential signals with high common-mode rejection, not when driving 16-bit SAR ADCs from ±10 V sources. |
Compared with AD8275BRMZ, AD8270ARMZ offers gain flexibility but lacks factory-trimmed level translation, while INA149AIDR provides ultra-high common-mode tolerance but cannot deliver rail-to-rail 4 V full-scale output needed for precision ADC interfacing.
Availability
AD8275BRMZ is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, instrumentation amplifier front ends, and high-voltage sensor interface applications requiring stable component supply and guaranteed long-term availability.
Supply support for AD8275BRMZ 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 AD8275BRMZ belongs to Analog Devices' precision difference amplifier product line, engineered specifically to simplify ±10 V to single-supply ADC interfacing in industrial and instrumentation systems without external passive networks.
FAQ
What is the primary function of the AD8275BRMZ in a signal chain?
The AD8275BRMZ functions as a fixed-gain (G = 0.2) difference amplifier that translates ±10 V industrial sensor signals to a 0–4 V single-ended output compatible with 16-bit SAR ADCs like the AD7685. Its integrated laser-trimmed resistors, rail-to-rail output, and fast 450 ns settling make it a complete, drop-in solution for precision level translation - eliminating external attenuators, op-amps, and trimming components in the AD8275BRMZ signal path.
Can the AD8275BRMZ operate from a 3.3 V supply?
Yes, the AD8275BRMZ supports a wide operating supply range from +3.3 V to +15 V. At 3.3 V, it maintains rail-to-rail output swing (within 48 mV of −VS and 100 mV of +VS), 450 ns settling time, and full specified performance over −40°C to +85°C. The reference configuration must be adjusted - e.g., REF1 = 0 V and REF2 = 3.3 V yields a 1.65 V output midpoint - to ensure linear operation within the reduced headroom of the AD8275BRMZ.
Why must the SENSE pin be connected to the OUT pin on the AD8275BRMZ?
The SENSE pin on the AD8275BRMZ enables force-sense feedback to correct for voltage drop across PCB traces and load current. Leaving SENSE unconnected degrades gain accuracy and output linearity. Tying SENSE directly to OUT ensures the internal amplifier regulates the true output node - preserving the 0.024% gain error and 80 dB CMRR specified in the AD8275BRMZ datasheet under all load conditions.
How does the AD8275BRMZ handle input overvoltage conditions?
The AD8275BRMZ features robust input protection: ESD diodes clamp +IN and −IN to −VS − 35 V and +VS + 40 V (at VS = 5 V). This allows direct connection to ±10 V field wiring without external TVS devices. However, sustained overvoltage beyond absolute maximum ratings (±40 V) risks damage. For fault-prone environments, external transorbs are recommended - but series resistors must be avoided, as they unbalance the internal laser-trimmed resistor network and degrade CMRR in the AD8275BRMZ.
Is the AD8275BRMZ suitable for driving differential-input ADCs?
Yes - the AD8275BRMZ can be configured for differential outputs using an external inverting op-amp (e.g., AD8655) as shown in its datasheet Figure 40. In this setup, the AD8275BRMZ provides the non-inverted output while the companion op-amp generates the inverted complement. Common-mode errors from both paths cancel at the differential ADC input, preserving the AD8275BRMZ's 80 dB CMRR and enabling high-fidelity acquisition of noisy, long-cable signals.
AD8275BRMZ 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:
- 150 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
AD8275BRMZ FAQ
1.How can I place an order for AD8275BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8275BRMZ 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 AD8275BRMZ reliable?
The price and inventory of AD8275BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8275BRMZ is usually 5 days.
3.What payment methods are accepted for AD8275BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8275BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8275BRMZ?
AD8275BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8275BRMZ 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 AD8275BRMZ?
For technical support, including AD8275BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8275BRMZ requirements.
6.How does Aetrix verify that AD8275BRMZ is sourced from the original manufacturer or authorized distributors?
All AD8275BRMZ 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 AD8275BRMZ meets industry standards.
7.What is the process for return or replacement of AD8275BRMZ?
All AD8275BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8275BRMZ, 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 AD8275BRMZ part is unused and in its original packaging.
Return procedure for AD8275BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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