ad8475 Analog Devices, Inc., ad8475 Datasheet

ad8475

Manufacturer Part Number

ad8475

Description

Precision, Selectable Gain, Fully Differential Funnel Amplifier Ad8475

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD8475.pdf (24 pages)

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FEATURES

Precision attenuation: G = 0.4, G = 0.8

Fully differential or single-ended input/output

Differential output designed to drive precision ADCs

VOCM pin adjusts output common mode

Robust overvoltage protection up to ±15 V (V

Single supply: 3 V to 10 V

Dual supplies: ±1.5 V to ±5 V

High performance

Low power: 3.2 mA supply current

APPLICATIONS

ADC drivers

Differential instrumentation amplifier building blocks

Single-ended-to-differential converters

GENERAL DESCRIPTION

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.

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

Drives switched capacitor and Σ-Δ ADCs

Rail-to-rail output

Suited for driving 18-bit converter up to 4 MSPS

10 nV/√Hz output noise

3 ppm/°C gain drift

500 μV maximum output offset

50 V/μs slew rate

= +5 V)

Fully Differential Funnel Amplifier

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

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.

Precision, Selectable Gain,

+IN 0.4x

+IN 0.8x

–IN 0.8x

–IN 0.4x

NC = NO CONNECT

FUNCTIONAL BLOCK DIAGRAMS

1.25kΩ

Figure 1. 16-Lead LFCSP

Figure 2. 10-Lead MSOP

NC = NO CONNECT

1.25kΩ

AD8475

1kΩ

AD8475

www.analog.com

–OUT

+OUT

VOCM

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