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AD8475:  Precision, Selectable Gain, Fully Differential Funnel Amp

Product Details

Product Status:Recommended for New Designs

Newer Alternatives:
  • AD8476: Fully differential input and output amplifier with unity gain driver and 300uA low power dissipation.

The AD8475 is a fully differential, attenuating amplifier with integrated precision gain resistors. It provides precision attenuation (by 0.4 or 0.8), common-mode level shifting, and single-ended-to-differential conversion along with input overvoltage protection. Power dissipation on a single 5 V supply is only 16 mW.

The AD8475 is a simple to use, fully integrated precision gain block, designed to process signal levels of up to ±10 V on a single supply. It provides a complete interface to make industrial level signals directly compatible with the differential input ranges of low voltage, high performance 16-bit or 18-bit single-supply successive approximation (SAR) analog-to-digital converters (ADCs).

The AD8475 comes with two standard pin-selectable gain options: 0.4 and 0.8. The gain of the part is set by driving the input pin corresponding to the appropriate gain.

The AD8475 also provides overvoltage protection from large industrial input voltages up to ±15 V while operating on a single 5 V supply. The VOCM pin adjusts the output voltage common mode for precision level shifting, to match the ADC’s input range and maximize dynamic range. The AD8475 works extremely well with SAR, Σ-Δ, and pipeline converters. The high current output stage of the part allows it to drive the switched capacitor front-end circuits of many ADCs with minimal error.

Unlike many differential drivers in the market, the AD8475 is a high precision amplifier. With 500 μV maximum output offset, 10 nV/√Hz output noise, and −112 dB THD + N, the AD8475 pairs well with high accuracy converters. Considering its low power consumption and high precision, the slew-enhanced AD8475 has excellent speed, settling to 18-bit precision for 4 MSPS acquisition.

The AD8475 is available in a space-saving 10-lead MSOP package. It is fully specified over the −40°C to +85°C temperature range.


Applications
  • ADC driver
  • Differential instrumentation amplifier building block
  • Single-ended-to-differential converter

FEATURES and BENEFITS

  • Precision attenuation:
    G = 0.4, G = 0.8
  • Fully differential or single-ended input/output
  • Differential output designed to drive precision ADCs
    Drives switched capacitor and Σ-Δ ADCs
    Rail-to-rail output
  • VOCM pin adjusts output common mode
  • Robust over-voltage protection up to ±15V (VS = +5 V)
  • Single supply: 3V to 10V
  • Dual supplies: ±1.5V to ±5V
  • High performance
    Suited for driving 18-bit converter up to 4 MSPS
    10 nV/√Hz output noise
    3 ppm/°C gain drift
    See data sheet for additional features

Functional Block Diagram

Video: AD8475: Precision, Selectable Gain, Fully Differential Funnel Amplifier



ADI introduces the industry's first fully differential attenuating precision amplifier. Our expert explains how AD8475 effectively drives low-voltage, high-precision differential input SAR ADCs in high-voltage applications. Learn more by watching the video.

Documentation

Title Content Type File Type
AD8475: Precision, Selectable Gain, Fully Differential Funnel Amplifier Data Sheet (Rev C, 01/2014) (pdf, 1627 kB) Data Sheets PDF
AN-1264: Precision Signal Conditioning for High Resolution Industrial Applications  (pdf, 469 kB) Application Notes PDF
CN0292: Completely Isolated, Robust, 4-Channel, Multiplexed Data Acquisition System for Industrial Level Signals  (pdf, 500 kB) Circuit Note PDF
CN-0251: A Flexible 4-Channel Analog Front End for Wide Dynamic Range Signal Conditioning  (pdf, 253 kB) Circuit Note PDF
CN0310: Precision 24-Bit, 250 kSPS Single-Supply Sigma-Delta ADC System for Industrial  (pdf, 167 kB) Circuit Note PDF
CN0269: 18-Bit, 1.33 MSPS, 16-Channel Data Acquisition System  (pdf, 1177 kB) Circuit Note PDF
CN-0272: 2 MHz Bandwidth PIN Photodiode Preamp with Dark Current Compensation  (pdf, 376 kB) Circuit Note PDF
CN-0240: Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection  (pdf, 336 kB) Circuit Note PDF
CN-0180: Precision Single-Supply Differential ADC Driver for Industrial-Level Signals  (pdf, 388 kB) Circuit Note PDF
AD8475: Precision, Selectable Gain, Fully Differential Funnel Amplifier
The Analog Devices AD8475 is a fully differential, attenuating amplifier with integrated precision gain resistors.
Videos HTML
Analog Devices Introduces Industry’s First 24-Bit Sigma Delta A/D Converter with Rail-to-Rail Analog and Reference Input Buffers On-chip (11 Nov 2014) Press Releases HTML
SAR ADC & Driver Quick-Match Guide  (pdf, 251 kB)
Find drivers for ADI's most popular single-ended and differential SAR ADCs based on your specific application conditions.
Product Selection Guide PDF
Industrial ICs
Industrial ICs Solutions Bulletin, Volume 10, Issue 8
Solutions Bulletins HTML
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
AD8475 SPICE Macro-Model SPICE Models HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

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Price, packaging, availability

AD8475 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8475ACPZ-R7 Status: Production 16 ld LFCSP (3x3mm, 1.5mm exposed pad) 16 Ind Reel, 1500 $2.39 $1.99 Y  Material Info PCN Purchase Sample
AD8475ACPZ-RL Status: Production 16 ld LFCSP (3x3mm, 1.5mm exposed pad) 16 Ind Reel, 5000 $2.39 $1.99 Y  Material Info PCN Purchase
AD8475ACPZ-WP Status: Production 16 ld LFCSP (3x3mm, 1.5mm exposed pad) 16 Ind Tray, 50 $2.39 $1.99 Y  Material Info Notify Me Purchase
AD8475ARMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $2.39 $1.99 Y  Material Info Notify Me Purchase Sample
AD8475ARMZ-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 $2.39 $1.99 Y  Material Info Notify Me Purchase
AD8475ARMZ-RL Status: Production 10 ld MSOP 10 Ind Reel, 3000 $2.39 $1.99 Y  Material Info Notify Me Purchase
AD8475BRMZ Status: Production 10 ld MSOP 10 Ind Tube, 50 $3.30 $2.75 Y  Material Info Notify Me Purchase Sample
AD8475BRMZ-R7 Status: Production 10 ld MSOP 10 Ind Reel, 1000 $3.30 $2.75 Y  Material Info Notify Me Purchase
AD8475BRMZ-RL Status: Production 10 ld MSOP 10 Ind Reel, 3000 $3.30 $2.75 Y  Material Info Notify Me Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD8475 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8475-EVALZ Status: Production Evaluation Board $20.98 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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