Analog Devices Linear Technology DC2622A Guida rapida alla configurazione

dc2622af

DEMO MANUAL DC2622A

Description

ADA4899-1

Rail-to-Rail SAR ADC

Driver Amplifier

Demonstration circuit 2622A features the ADA4899-1

amplifier. The DC2622A includes two of these amplifiers

and is designed to drive the inputs of the DC2290 demo

board. The DC2290 features the LTC

2387 18-bit, 15Msps

high speed SAR ADC. The linearity and low noise of the

ADA4899-1 make itan ideal candidateto drive the LTC2387

at frequencies above 1MHz. See Table 1.

The DC2622A is configured to accept a single-ended in-

put signal and provide unity gain. The board can provide

voltage gain if several component values are changed. For

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog

Devices, Inc. All other trademarks are the property of their respective owners.

example, a voltage gain of two will result if the following

changes are made:

Change R23 to 309Ω

Install 309Ω at R27

Install 100pF at C28

Change R18 to 287Ω

Design files for this circuit board are available at

http://www.linear.com/demo/DC2622A

Figure 1. DC2622A Connection Diagram

FROM

SIGNAL SOURCE

FROM DC COMMON

MODE REFERENCE

TO DC2290

–5V +10V

DC2622 F01

Table 1. DC2290 (LTC2387 Family) Driver Boards

INPUT FREQUENCY DRIVER BOARD AMPLIFIER

Up to 8kHz DC2402 LT6237

Up to 1MHz DC2403 LT6200

>1MHz Lowest Noise — DC2622

Lowest Distortion — DC2623

ADA4899-1

LTC6404-1 + AD8002

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dc2622af

DEMO MANUAL DC2622A

Quick start proceDure

Connect the DC2622A to a DC2290A using the two output

SMA connectors J1, J3. Connect the +10V and –5V DC

supplies to the turrets on the DC2622A. Apply a 2.048V

HarDware setup

SIGNAL CONNECTIONS

J2 IN. This is the signal input.

J3 –OUT. This is the negative signal output.

J1 +OUT. This is the positive signal output.

DC voltage, preferably from E7 of the DC2290A, to 2.048V

in turret of the DC2622A.

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dc2622af

DEMO MANUAL DC2622A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

scHematic Diagram

ADA4899-1

–2.5V

+7.5V

–5VIN

+10VIN

OUT

GND

BYP

SHDN

LT1763

C13

0.01µF

GND

SHDN

ADJ

OUT

LT1964-SD

1µF

22µF

10µF

1.05k

GND

1µF

22µF

10µF

ADJ

5.11k

2.048V

C28

DNI

C27

10µF

100pF

ADA4899-1

–OUT

C23

10µF

C10

0.1µF

C21

10µF

C11

68pF

0.1µF

–2.5V

+7.5V

R23

0Ω

R10

24.9Ω

C13

0.1µF R8

10Ω

C14

100pF

R14

24.9Ω

R25

49.9Ω

R18

590Ω

0Ω

49.9Ω

820nH

R11

100Ω

R12

300Ω

R13

300Ω

C12

68pF

R27

DNI

270nH

82nH

562Ω

49.9Ω

100pF

C26

10µF

C18

0.1µF

C24

10µF

C17

68pF

C16

0.1µF

–2.5V

+7.5V

R15

24.9Ω

R19

590Ω

R23

0Ω

R21

49.9Ω

820nH

R20

100Ω

R16

300Ω

C15

68pF

R17

300Ω

270nH

82nH

R22

562Ω

R24

49.9Ω

C19

100pF

+OUT

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dc2622af

DEMO MANUAL DC2622A

LT 0317 • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2017

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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