Quad 20MHz & Quad 70MHz, Switched Gain Pre-Amp Features General Description • Autozero of output offset to <10mV • 3 selectable gains • Space-saving QSOP-24 package • Differential Sum & Sum-Bar outputs • Single 5V supply The EL6263C consists of four 30MHz trans-impedance amplifiers and four 70MHz trans-impedance amplifiers. The four 70MHz amplifier outputs also are averaged to provide differential 70MHz outputs. Applications • • • • • • DVD RAM, RW, and ROM CD RW, R and ROM MO drives Optical Pickup pre-amplifier Servo positioning systems High speed instrumentation EL6263CU Package 24-Pin QSOP Tape & Reel Two TTL/CMOS-compatible select the gains for all eight amplifiers. The gain settings for the fast amplifiers are 5.4kΩ, 10.7kΩ, and 28.6kΩ. The gain settings for the slow amplifiers are 13.3kΩ, 25kΩ, and 66.7kΩ. The gain settings for the sum and sumbar outputs are 7.6kΩ, 14.3kΩ, and 38.1kΩ measured single-ended. Gain matching is typically 3% channel to channel. The autozero input reduces each amplifier’s output offset to less than 10mV when it goes high. The AZ pin is TTL/CMOS-compatible. The E, F, G, and H channel bandwidths are 30MHz for all gains and reasonable input and output loads. The A, B, C, D, S, and S channels have bandwidths of 70MHz, 46MHz, and 40MHz at low, middle, and high gains respectively after driving 25cm of flex circuit. Ordering Information Part No The EL6263C is designed to amplify the photodiode currents for CD, DVD, or other photodiode pick-up applications. EL6263C - Product Brief EL6263C - Product Brief Outline # MDP0040 Each amplifier output can typically sink or source up to 5mA and their outputs can swing 1VP-P at full bandwidth. The EL6263C operates from a single +5V supply and is available in QSOP-24 package. It is specified for operation from -0°C to 70°C. Connection Diagram GAIN 0 SELECT 1 24 AZ INPUT GAIN 1 SELECT 2 23 SUM OUTPUT REF INPUT 3 22 SUM OUTPUT 21 A OUTPUT B INPUT 5 20 B OUTPUT C INPUT 6 19 C OUTPUT D INPUT 7 18 D OUTPUT 0V (VSS) 8 17 +5V (VDD) E INPUT 9 16 E OUTPUT F INPUT 10 15 F OUTPUT G INPUT 11 14 G OUTPUT H INPUT 12 13 H OUTPUT Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation. © 2001 Elantec Semiconductor, Inc. October 12, 2000 A INPUT 4 EL6263C - Product Brief EL6263C - Product Brief Quad 20MHz & Quad 70MHz, Switched Gain Pre-Amp General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. October 12, 2000 WARNING - Life Support Policy Elantec, Inc. products are not authorized for and should not be used within Life Support Systems without the specific written consent of Elantec, Inc. Life Support systems are equipment intended to support or sustain life and whose failure to perform when properly used in accordance with instructions provided can be reasonably expected to result in significant personal injury or death. Users contemplating application of Elantec, Inc. Products in Life Support Systems are requested to contact Elantec, Inc. factory headquarters to establish suitable terms & conditions for these applications. Elantec, Inc.’s warranty is limited to replacement of defective components and does not cover injury to persons or property or other consequential damages. Elantec Semiconductor, Inc. 675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 (888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6020 Japan Technical Center: +81-45-682-5820 2 Printed in U.S.A.