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.
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.
|Title||Content Type||File Type|
|AD8475: Precision, Selectable Gain, Fully Differential Funnel Amplifier Data Sheet (Rev C, 01/2014) (pdf, 1627 kB)||Data Sheets|
|AN-1264: Precision Signal Conditioning for High Resolution Industrial Applications (pdf, 469 kB)||Application Notes|
|CN-0251: A Flexible 4-Channel Analog Front End for Wide Dynamic Range Signal Conditioning (pdf, 253 kB)||Circuit Note|
|CN0310: Precision 24-Bit, 250 kSPS Single-Supply Sigma-Delta ADC System for Industrial (pdf, 167 kB)||Circuit Note|
|CN0269: 18-Bit, 1.33 MSPS, 16-Channel Data Acquisition System (pdf, 1177 kB)||Circuit Note|
|CN-0272: 2 MHz Bandwidth PIN Photodiode Preamp with Dark Current Compensation (pdf, 376 kB)||Circuit Note|
|CN-0240: Bidirectional Isolated High-Side Current Sense with 270 V Common-Mode Rejection (pdf, 336 kB)||Circuit Note|
|CN-0180: Precision Single-Supply Differential ADC Driver for Industrial-Level Signals (pdf, 388 kB)||Circuit Note|
AD8475: Precision, Selectable Gain, Fully Differential Funnel Amplifier
The Analog Devices AD8475 is a fully differential, attenuating amplifier with integrated precision gain resistors.
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|
Industrial ICs Solutions Bulletin, Volume 10, Issue 8
|RAQs index||Rarely Asked Questions||HTML|
|Glossary of EE Terms||Glossary||HTML|
|Title||Content Type||File Type|
|AD8475 SPICE Macro-Model||SPICE Models||HTML|
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.