Linear Technology DC2460A Guida rapida alla configurazione

dc2460af

DEMO MANUAL DC2460A

DESCRIPTION ABSOLUTE MAXIMUM

INPUT RATINGS

LTC5566

300MHz to 6GHz Dual Programmable

Gain Downconverting Mixer

Demonstration circuit 2460A is optimized for evaluation

of the LT C

5566 dual programmable gain downconverting

mixer. Each channel incorporates an active mixer and a

digital IF VGA with 15.5dB gain control range. The IF gain

of each channel is independently programmable through

the SPI in 0.5dB steps. Its single-ended RF ports are tun-

able via the SPI or parallel control lines and have a range

from 300MHz to 6GHz. The LO port is always matched to

50Ω from 150MHz to 6GHz with 10dB return loss. The

differential IF port is usable from 1MHz to 500MHz. There

is a reduced power mode available through the SPI, which

lowers the total current consumption by 25%.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2460A

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

Technology Corporation. All other trademarks are the property of their respective owners.

BOARD LAYOUT

Figure 1. DC2460A

Supply Voltage

(VDD, VCC1, VCC2, IF1+, IF1–, IF2+, IF2–)..................4V

EN1, EN2, T0, T1 Input Voltages ......–0.3V to VCC + 0.3V

LO+, LO–Input Power (150MHz to 6GHz).......... +10dBm

RF1, RF2 Input Power (300MHz to 6GHz)..........+20dBm

LO+, LO–Input DC Voltage.....................................±0.5V

IF DVGA Peak Differential Input Voltage....................±4V

SDI, CLK, CSB, PS Input Voltages.... –0.3V to VDD +0.3V

SDO Output Current............................................. ±10mA

Operating Temperature Range (TC)........ –40°C to 105°C

Junction Temperature (TJ) .................................... 150°C

Storage Temperature Range .................. –65°C to 150°C

Caution: This part is sensitive to electrostatic discharge

(ESD). Observe proper ESD precautions when handling

the LTC5566.

dc2460af

DEMO MANUAL DC2460A

PROPER TEST SETUP

Figure 2. Test Setup for Downconverting Mixer 2-Tone Measurement

180°

0°

dc2460af

DEMO MANUAL DC2460A

NOTES ON TEST EQUIPMENT AND SETUP

n High performance signal generators with low harmonic

outputs should be used for 2-tone measurements. Oth-

erwise, low pass filters at the signal generator outputs

should be used to suppress harmonics.

n High quality combiners should be used to present a

broadband 50Ω termination on all ports as well as

provide good port-to-port isolation. Adding attenuator

pads further improvessourceisolation and helps prevent

the signal generators from producing intermodulation

products.

n Spectrum analyzers can produce significant internal

distortion products if they are overdriven. Generally,

spectrum analyzers are designed to operate at their

best with about –30dBm to –40dBm at their input. The

spectrum analyzer’s input attenuation setting should be

used to avoid saturating the instrument.

n Setthe spectrum analyzer’s input attenuation depending

on the spectrum analyzer used.

n Before performing measurements on the DUT, the sys-

tem performance should be evaluated to ensure that

a clean input signal is obtained and that the spectrum

analyzer’s internal distortion is minimized.

dc2460af

DEMO MANUAL DC2460A

QUICK START PROCEDURE

1. Connect all test equipment as shown in Figure 2.

2. Set the power supply output voltage to 3.3V, and set

the current limit to 500mA.

3. Connect the ground and VCC turrets to the power supply.

BE SURE TO CONNECT THE VCC TURRET BEFORE

THE EN TURRET TO ENSURE THAT THE PART DOES

NOT GET DAMAGED. ALSO, REMOVE POWER FROM

EN TURRET BEFORE REMOVING POWER FROM THE

VCC TURRET.

4. Connect the EN turret to the power supply.

5. Set the LO signal generator to provide a 2753MHz CW

signal at about 0dBm to the demo board’s LO port.

6. Set the RF signal generators to provide one 2599MHz

CW signal and one 2601MHz CW signal. The signals

should be applied to the 2-way combiner. The output

of the combiner should be applied to the demo board’s

RF1 input port. The two tones should be set to –8dBm

each at the mixer’s RF1 input port.

7. Set the spectrumanalyzer’scenter frequency to 153MHz

with a span of 10MHz. Combine the DC2460A IF1+

and IF1–Outputs using a 180° combiner. Connect the

combiner’s output to the spectrum analyzer.

8.Performvariousmeasurements(Conversion Gain, OIP3,

LO leakage, etc.

dc2460af

DEMO MANUAL DC2460A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP., 4.3pF, C0G, 50V, ±0.1pF, 0402 Murata, GJM1555C1H4R3BB01

2 6 C3, C4, C102-C105 CAP., 2.2pF, C0G, 50V, ±0.1pF, 0402 Murata, GJM1555C1H2R2BB01

3 4 C5-C8 CAP., 1000pF, X7R, 50V, 10%, 0201 Murata, GRM033R71H102KA12

4 8 C9-C16 CAP., 10nF, X7R, 50V, 10%, 0402 Murata, GRM155R71H103KA88

5 1 C17 CAP., 0.3pF, C0G, 25V, ±0.05pF, 0201 Murata, GRM0335C1HR30WA01

6 2 C18, C19 CAP., 1µF, X5R, 50V, 10%, 0603 Murata, GRM188R61H105KAAL

7 2 C101, C106 CAP., 0.1µF, X7R, 50V, 10%, 0402 Murata, GRM155R71H104KE14

8 5 E1-E5 TEST POINT, TURRET, .064 MTG. HOLE MILL-MAX,2308-2-00-80-00-00-07-0

9 4 JP1-JP4 JMP, 3PIN 1 ROW .079CC SAMTEC, TMM-103-02-L-S

10 1 JP101 HEADER, 2 ×7PIN, 0.079CC MOLEX, 87831-1420

11 7 J1-J7 CON., SMA, 50Ω, EDGE-LANCH EF JOHNSON, 142-0701-851

12 8 L1-L4, L11-L14 IND., 680nH, 5%, 0603 COILCRAFT, 0603AF-681XJE

13 4 L5-L8 IND., 47nH, 2%, 0402 COILCRAFT, 0402HP-47NXGL

14 2 L9, L10 DNI DNI

15 4 L15-L18 IND., 33nH, 2%, 0402 COILCRAFT, 0402HP-33NXGL

16 2 R101, R107 RES., 200k, 1%, 0402 Vishay, CRCW0402200KFKED

17 5 R102-R106 RES., 1k, 1%, 0402 Vishay, CRCW04021K00FKED

18 3 R108-R110 DNI DNI

19 2 T1, T2 DNI DNI

20 1 U1 300MHz to 6GHz Dual Programmable Gain

Downconverting Mixer

Linear Tech., LTC5566IUH#PBF

21 1 U101 DNI DNI

22 1 U102 Dual Supply Translating Transciever, 3-state NXP, 74LVC1T45GW

23 2 U103,U104 Dual Buffer with 3-state output FAIRCHILD, NC7WZ17P6X

24 1 CABLE ASSY., 8" STRIP LINEAR RIBBON CABLE CA-2440

dc2460af

DEMO MANUAL DC2460A

SCHEMATIC DIAGRAM

D D

C C

B B

A A











































 



 

















 

 









 























LTC5566IUH





































































 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 





















 



















 

 















 

 





 

 



 















 









 











 







 

 

























 

 







 











 









 



Figure 3. DC2460A Schematic Page 1

dc2460af

DEMO MANUAL DC2460A

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

DNI DNI DNI

DNI

Figure 4. DC2460A Schematic Page 2

dc2460af

DEMO MANUAL DC2460A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0816 • 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

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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