DC2349A - ANALOG DEVICES - Datasheet.Directory

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DEMO MANUAL DC2349A

DESCRIPTION

LTC5586

6GHz High Linearity I/Q Demodulator

with Wideband IF Amplifier

Demonstration circuit 2349A showcases the LT C

5586

wideband high linearity IQ demodulator with IF amplifier.

The Linear Technology USB serial controller, DC590B, isre-

quired to control and configure LTC5586 for its evaluation.

Demo circuit 2349A’s two switchable single-ended RF

inputs are optimized for 700MHz to 6GHz. Its single-

ended LO input is programmable for 300MHz to 6GHz

operation via SPI bus. The demo circuit includes discrete

L-C inter-stage lowpass filters between the demodula-

tor outputs and the IF amplifier inputs, which limits the L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

BOARD PHOTO

DC-coupled differential I and Q outputs to about 500MHz

(–1dB bandwidth).

By writing to specific registers through SPI bus, LTC5586’s

RF input step attenuator, IF amplifier gain, LO input fre-

quency, output DC offset, image rejection, and linearity

can be adjusted or optimized.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2349A

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DEMO MANUAL DC2349A

QUICK START PROCEDURE

NOTE 1. Evaluation of demonstration circuit 2349A requires

the Linear Technology USB serial controller, DC590B, and

the Linear Technology QuikEval™ software. Please refer

to DC590B demo manual for their setup and installation.

NOTE 2. An internet connection is required for the automatic

download and installation of the LTC5586 software GUI.

If an internet connection is not available, contact Linear

Technology for installation files

NOTE 3. Refer to Figure 1 for proper equipment setup.

NOTE 4. Make all connections without RF and DC applied.

NOTE 5. Care should be taken to never exceed absolute

maximum input ratings.

1. If not already done, install the QuikEval software

and connect the DC590B USB serial controller to an

internet-connected computer’s USB port.

2. Set the DC590B’s isolated supply voltage to 3.3V by

moving its VCCIO jumper (JP6) to 3.3V position.

3. Verify that the DC2349A’s jumpers are set to:

JP1 = INT (on-board 3.3V digital supply)

JP2 = RFA (RFA input selected)

4. While the RF sources and the DC power supplies are

switched off, connect all test equipment as shown in

Figure1.

5. When the DC2349A demo board is connected to the

DC590B USB serial controller, the QuikEval software

will automatically download and install the proper

software GUI.

6. While monitoring the voltage on VSENSE, increase

the VSUPPLY DC power supply voltage until VSENSE

reaches 5V (VSUPPLY voltage should be approxi-

mately5.5V). Verify the current consumption is close

to the figure listed in the data sheet.

7. Increase the IF amplifier common-mode output volt-

age, VCM, to 0.9V.

8. In the LTC5586 QuikEval computer GUI, verify that

“Connected” is displayed, then press the “Soft Reset”

button. See Figure 2.

9. Set the desired LO frequency and LO power, and turn

on the LO signal source.

10. Use the LTC5586 QuikEval GUI to configure the

LTC5586 to the same LO frequency.

11. Set the desired RF frequency and RF power, and turn

on the RF source.

12. Perform measurements.

13. The LTC5586 QuikEval GUI can be used to control and

configure various functions of the LTC5586. Press the

button “Show Regs” will make the LTC5586’s internal

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DEMO MANUAL DC2349A

Figure 2. Proper Measurement Equipment Setup

QUICK START PROCEDURE

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DEMO MANUAL DC2349A

QUICK START PROCEDURE

Figure 2. LTC5586 QuikEval GUI

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DEMO MANUAL DC2349A

QUICK START PROCEDURE

Figure 3. LTC5586 QuikEval GUI Showing Internal Resisters

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DEMO MANUAL DC2349A

PCB LAYOUT

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DEMO MANUAL DC2349A

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.

PCB LAYOUT

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DEMO MANUAL DC2349A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com

LT 0616 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 LTC 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 LTC 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. LTC assumes no liability for applications assistance,

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

LTC 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 LTC application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035