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Analog Devices Inc. AD8476ARMZ-R7
- Part No.:
- AD8476ARMZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8476ARMZ-R7.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,938
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Product details
Overview
AD8476ARMZ-R7 from Analog Devices is a low-power, unity-gain, fully differential amplifier optimized as an ADC driver with rail-to-rail outputs, 330 μA supply current, −126 dB HD2 at 10 kHz, and 6 MHz bandwidth. It serves as a precision single-ended-to-differential converter in battery-powered instrumentation and high-accuracy data acquisition systems.
For engineers reviewing the AD8476ARMZ-R7 datasheet, AD8476ARMZ-R7 pinout, AD8476ARMZ-R7 application, or AD8476ARMZ-R7 equivalent, key selection criteria include output common-mode control via VOCM, robust ±23 V input overvoltage tolerance, 200 μV max output offset, and compatibility with SAR/Σ-Δ ADCs up to 250 kSPS.
Technical Context
The AD8476ARMZ-R7 employs a voltage-feedback topology with dual internal feedback loops-one for differential gain (fixed by laser-trimmed 10 kΩ resistors) and one for common-mode regulation via the VOCM pin. Its fully differential architecture ensures precise 180° phase opposition between +OUT and −OUT across frequency.
It achieves DC precision through matched on-chip resistor networks (±0.02% gain error), enabling >90 dB CMRR without external trimming. Input overvoltage protection extends to ±18 V beyond supplies, and rail-to-rail output swing supports maximum dynamic range into switched-capacitor ADC front ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 330 μA at +5 V - enables ultra-low-power operation in portable and energy-constrained systems. |
| Bandwidth | 6 MHz small-signal - supports accurate signal conditioning for ADC sampling up to 250 kSPS. |
| HD2 / HD3 | −126 dB / −128 dB at 10 kHz - ensures minimal harmonic distortion in precision measurement paths. |
| Output Noise | 39 nV/√Hz - preserves SNR when driving 16-bit ADCs with high resolution requirements. |
| Gain Drift | 1 ppm/°C - maintains stable gain across −40°C to +125°C industrial temperature range. |
| Output Offset | 200 μV max - reduces calibration burden in high-accuracy analog front ends. |
| Slew Rate | 10 V/μs - enables fast settling to 16-bit accuracy within 1.6 μs for step inputs. |
Pinout & Package
AD8476ARMZ-R7 is packaged in an 8-lead MSOP (3 mm × 3 mm) with exposed paddle. Pin 6 (NC) is internally unconnected and should be grounded per best practice to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INP (Pin 8) | Positive Input | Differential input node; accepts single-ended or differential signals with rail-to-rail common-mode range. |
| INN (Pin 1) | Negative Input | Differential input node; paired with INP to define VIN,dm = VINP − VINN. |
| +VS (Pin 2) | Positive Supply | Accepts 3 V to 18 V single supply or +1.5 V to +9 V of dual supply; powers internal amplifier core. |
| −VS (Pin 7) | Negative Supply | Required for dual-supply operation; supports −1.5 V to −9 V; enables true bipolar input/output swing. |
| VOCM (Pin 3) | Output Common-Mode Adjust | Directly sets VOUT,cm = (V+OUT + V−OUT)/2; matches ADC input common-mode range without external components. |
| +OUT (Pin 4) | Noninverting Output | Delivers rail-to-rail differential output; designed to drive switched-capacitor ADC inputs with minimal settling error. |
| −OUT (Pin 5) | Inverting Output | Complementary output; maintains precise amplitude/phase balance with +OUT for high CMRR performance. |
| NC (Pin 6) | No Connect | Internally floating; grounding recommended to reduce noise susceptibility and improve EMI immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed resistor network | Guarantees 0.02% gain error and >90 dB CMRR without external calibration or matching components. |
| VOCM-controlled common-mode output | Enables direct interface to ADCs with arbitrary input common-mode voltage (e.g., 0.3 V to VDD − 0.3 V). |
| Rail-to-rail output swing | Delivers full dynamic range into 2 kΩ differential loads - maximizes effective resolution of downstream ADCs. |
| ±23 V input overvoltage tolerance | Protects against transients in industrial sensor interfaces without external clamping diodes or series resistors. |
| Low 39 nV/√Hz noise density | Maintains signal integrity in high-resolution applications such as weigh scales and medical instrumentation. |
Applications
| ADC Driver | Differential Instrumentation Amplifier Building Block |
|---|---|
Use Scenario: Driving the differential input of a 16-bit SAR ADC in a portable multimeter with 5 V single supply. IC Role / Device Role / Timing Role: Precision unity-gain buffer and level shifter that converts single-ended sensor output to balanced differential signal while setting VOCM to match ADC's 2.5 V common-mode requirement. Use Value: Eliminates need for discrete resistor networks and external op-amps, reducing BOM count and layout area while maintaining THD+N < −102 dB at 10 kHz. | Use Scenario: Front-end stage in a low-power EEG acquisition system requiring high CMRR and low power. IC Role / Device Role / Timing Role: Differential gain stage configured with external feedback to set G = 10, leveraging AD8476ARMZ-R7's matched internal resistors for stable common-mode rejection. Use Value: Achieves >80 dB CMRR up to 10 kHz without trimming, enabling reliable detection of µV-level neural signals amid noisy environments. |
| Battery-Powered Instruments | Single-Ended-to-Differential Conversion |
Use Scenario: Signal conditioning path in a handheld gas analyzer powered by two AA cells (3 V nominal). IC Role / Device Role / Timing Role: Low-quiescent-current ADC driver operating from 3 V supply, delivering rail-to-rail output swing and VOCM-adjustable common mode for 3 V ADC interface. Use Value: 330 μA supply current extends battery life beyond 1 year in continuous-use mode while preserving 16-bit ENOB performance. | Use Scenario: Interfacing a single-ended MEMS pressure sensor to a differential-input Σ-Δ ADC in an industrial IoT node. IC Role / Device Role / Timing Role: Converts unipolar 0–2.5 V sensor output to symmetrical ±1.25 V differential signal with VOCM = 1.25 V and gain = 1. Use Value: Rejects common-mode noise induced on long PCB traces or cables, improving immunity to EMI in factory-floor deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8475ARMZ-R7 | Integrated attenuation (G = 0.8 or 0.4); no VOCM pin; fixed output common-mode at VREF/2. | Better suited for ADCs with fixed reference-based common-mode input; not adjustable post-layout. | Select AD8475ARMZ-R7 only when VOCM flexibility is unnecessary and gain scaling is required before the ADC. |
| ADA4941-1ARMZ-R7 | Higher supply current (1.2 mA), wider bandwidth (25 MHz), no integrated resistors - requires external gain-setting network. | Supports higher-speed ADCs (>1 MSPS); demands careful layout and resistor matching to achieve AD8476ARMZ-R7's DC precision. | Choose ADA4941-1ARMZ-R7 when bandwidth >10 MHz is needed and design resources exist for precision external resistor placement. |
Compared with AD8476ARMZ-R7, AD8475ARMZ-R7 trades VOCM adjustability for built-in attenuation and lower cost, while ADA4941-1ARMZ-R7 offers speed at the expense of power, complexity, and DC accuracy - making AD8476ARMZ-R7 optimal for low-power, high-precision, production-ready ADC driver designs.
Availability
AD8476ARMZ-R7 is available at Aetrix Electronics and suitable for battery-powered instruments, precision data acquisition systems, and industrial sensor interfaces requiring stable component supply and guaranteed long-term availability.
Supply support for AD8476ARMZ-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 digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The AD8476ARMZ-R7 belongs to Analog Devices' precision differential amplifier product line, engineered specifically for low-power, high-fidelity ADC driving and single-ended-to-differential conversion in space- and energy-constrained systems.
FAQ
What is the supply voltage range supported by the AD8476ARMZ-R7?
The AD8476ARMZ-R7 operates from a single supply of 3 V to 18 V or dual supplies of ±1.5 V to ±9 V. At +5 V single supply, it draws only 330 μA, making it ideal for low-power applications. Absolute maximum ratings allow ±10 V supply, but functional operation is specified within the stated ranges. The AD8476ARMZ-R7 maintains full performance across its entire −40°C to +125°C temperature range under these conditions.
How does the VOCM pin function in the AD8476ARMZ-R7?
The VOCM pin on the AD8476ARMZ-R7 directly sets the output common-mode voltage: VOUT,cm = (V+OUT + V−OUT)/2 equals the applied VOCM voltage. This allows precise alignment with the input common-mode range of downstream ADCs without external components. If left unconnected, internal circuitry self-biases VOCM to midsupply. The AD8476ARMZ-R7 specifies VOCM input impedance as 500 kΩ and gain error of 0.05%, ensuring accurate tracking across temperature.
Can the AD8476ARMZ-R7 drive switched-capacitor ADC inputs effectively?
Yes, the AD8476ARMZ-R7 is explicitly designed to drive switched-capacitor ADC inputs. Its high-current output stage delivers 35 mA short-circuit current and maintains <1.6 μs settling to 0.001% for 2 V steps, minimizing acquisition errors. With 0.1 Ω output impedance and 20 pF capacitive load capability per output, it stabilizes quickly after ADC sampling transients - a key advantage confirmed in Analog Devices' "Low Power ADC Driving" application section for the AD8476ARMZ-R7.
What is the maximum input overvoltage tolerance of the AD8476ARMZ-R7?
The AD8476ARMZ-R7 withstands input voltages up to +VS + 18 V and −VS − 18 V due to integrated ESD protection diodes - equivalent to ±23 V with ±5 V supplies. This robustness protects against transient surges in industrial sensor interfaces without requiring external clamping. Absolute maximum ratings specify ±10 V supply, but input overvoltage protection remains active beyond supply rails, as verified in the Absolute Maximum Ratings table of the AD8476ARMZ-R7 datasheet.
Does the AD8476ARMZ-R7 require external resistors for unity gain operation?
No, the AD8476ARMZ-R7 integrates precision laser-trimmed 10 kΩ resistors for fixed unity gain (G = 1), eliminating external components and matching errors. Gain error is specified at 0.02% (B grade) with 1 ppm/°C drift - performance unattainable with discrete resistors without 0.01% matching. The internal resistor network also enables >90 dB CMRR and simplifies layout, making the AD8476ARMZ-R7 a complete, calibrated solution for precision differential amplification.
AD8476ARMZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 5 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 330µA
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 18 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8476ARMZ-R7 FAQ
1.How can I place an order for AD8476ARMZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8476ARMZ-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 AD8476ARMZ-R7 reliable?
The price and inventory of AD8476ARMZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8476ARMZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8476ARMZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8476ARMZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8476ARMZ-R7?
AD8476ARMZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8476ARMZ-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 AD8476ARMZ-R7?
For technical support, including AD8476ARMZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8476ARMZ-R7 requirements.
6.How does Aetrix verify that AD8476ARMZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8476ARMZ-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 AD8476ARMZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8476ARMZ-R7?
All AD8476ARMZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8476ARMZ-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 AD8476ARMZ-R7 part is unused and in its original packaging.
Return procedure for AD8476ARMZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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