AN-0993 APPLICATION NOTE One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Active Filter Evaluation Board for Analog Devices, Inc., Low Distortion Pinout Op Amps by John Ardizzoni plished by swapping the location of the filters resistors and capacitors. The boards also have provisions for edge-mounted SMA connectors, which simplify testing and integration. The EVAL-FLTR-LD-1RZ active filter evaluation board is designed to work with the Analog Devices, Inc., low distortion SOIC pinout op amps, which include the following high performance devices: AD8000, AD8099, AD8045, ADA4899, and ADA4857. The active filter board enables quick prototyping of two-, four-, or six-pole Sallen-Key active filters. The board schematic shown in Figure 1 is for a low-pass filter. Converting the board from a low-pass filter to a high-pass filter is accom- The active filter evaluation boards are bare, which enables users to customize the filter design. The filter board assembly drawing is shown in Figure 2. All components are 0603 case sizes with the exception of the large bypass capacitors, which are 3216 case sizes. C1 C8 C3 0.01µF C4 10µF + R2 7 3 C2 U1 2 R3 4 –V 7 3 4 C6 10µF + R7 C11 0.01µF 1 GND R4 GND –VS GND R9 6 U2 2 RA –V R10 7 3 8 C13 2 RB GND R8 –VS C17 0.01µF 1 –V C18 10µF + GND GND –VS SECTION B GND J4 4 R11 R12 GND SECTION A RC 6 U3 C12 10µF + –VS TP3 PD GND +V 8 C7 C5 0.01µF 1 GND R6 J2 +VS GND SECTION C Figure 1. Active Filter Evaluation Board Schematic COMPONENT SIDE CIRCUIT SIDE 07955-002 GND R5 6 C16 10µF + TP2 PD GND +V 8 +VS 07955-001 RT C10 10µF + J3 R1 J1 C15 0.01µF +VS TP1 PD GND +V C14 C9 0.01µF +VS Figure 2. Active Filter Evaluation Board Assembly Drawing Rev. 0 | Page 1 of 2 AN-0993 Application Note NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. AN07955-0-12/08(0) Rev. 0 | Page 2 of 2