Product Details
●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 16-lead 3 mm × 3 mm LFCSP package and a 10-lead MSOP package. It is fully specified over the −40°C to +85°C temperature range.
●Applications
● ADC drivers
● Differential instrumentation amplifier building blocks
● Single-ended-to-differential converters
●### 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 voltage
● Robust overvoltage protection up to ±15 V (VS = +5 V)
● Single supply: 3 V to 10 V
● Dual supplies: ±1.5 V to ±5 V
● High performance
● Suited for driving 18-bit converters up to 4 MSPS
● 10 nV/√Hz output noise
● 3 ppm/°C gain drift
● 500 μV maximum output offset
● 50 V/μs slew rate
● Low power: 3.2 mA supply current
