Analog Devices Linear Technology DC2668A Quick setup guide

1
dc2668afa
DEMO MANUAL DC2668A
DESCRIPTION ABSOLUTE MAXIMUM INPUTS
LTC5552
3GHz to 20GHz Microwave Mixer
with Wideband DC to 6GHz IF
Demonstration circuit 2668A is optimized for evaluation
of the LT C
®
5552 passive double-balanced mixer. Its RF
port is broadband matched from 3GHz to 20GHz, and the
internal LO amplifier, requiring only a 0dBm drive level,
is broadband matched to 50Ω from 1GHz to 20GHz with
10dB Return Loss. The differential IF output is usable
from DC to 6GHz. The LTC5552 can be used for upcon-
verting and downconverting applications.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2668A
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.
BOARD PHOTO
Figure 1. DC2668A
Supply Voltage (VCC)...............................................4.0V
Enable Input Voltage (EN) ................. –0.3V to VCC+0.3V
LO Input Power (1GHz to 20GHz).........................10dBm
RF Power (3GHz to 20GHz)..................................20dBm
RF DC Voltage........................................................ ±0.1V
IF+/IF–Power (LF to 6GHz)..................................20dBm
IF+/IF–DC Voltage..................................................±0.3V
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 PRECAU-
TIONS WHEN HANDLING THE LTC5552.

2
dc2668afa
DEMO MANUAL DC2668A
PROPER TEST SETUPS
Figure 3. Test Setup for Upconverting Mixer Two-Tone Measurements
Figure 2. Test Setup for Downconverting Mixer Two-Tone Measurements

3
dc2668afa
DEMO MANUAL DC2668A
NOTES ON TEST EQUIPMENT SETUP
QUICK START PROCEDURE
•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.
•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 attenua-
tor pads further improves source isolation and helps
prevent the signal generators from producing inter-
modulation products.
•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.
•Set the spectrum analyzer’s input attenuation depend-
ing on the spectrum analyzer used.
•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.
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 200mA.
3. Connect the ground and V
CC
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 9560MHz CW
signal at about 0dBm to the demo board’s LO port.
6. Set the RF signal generators to provide one 9799MHz
CW signal and one 9801MHz 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
RF input port. The two tones should be set to –5dBm
each at the mixer’s RF input port.
7. Set the spectrum analyzer’s center frequency to
240MHz.
8. Perform various measurements (Conversion Gain,
OIP3, LO leakage, etc.).

4
dc2668afa
DEMO MANUAL DC2668A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., 18pF, C0G, 10V, 2%, 0402 AVX, 0402ZK180GBSTR
2 1 C2 CAP., 18pF, C0G, 50V, 1%, 0402 MURATA, GJM1555C1H180FB01
3 1 C3 CAP., 1μF, X7R, 10V, 10%, 0603 MURATA, GRM188R71A105KA61
4 3 E1-E3 TEST POINT, TURRET, 0.061" MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0
5 2 J1, J2 CONN., SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0761-881
6 1 J3 CONN., SMA, 50Ω, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851
7 1 T1 XFMR., 1:1, 4.5-3000MHz MINI-CIRCUITS, TC1-1-13M+
8 1 U1 I.C., LTC5552IUDB, QFN 12 PIN, 3mm × 2mm LINEAR TECHNOLOGY, LTC5552IUDB#PBF

5
dc2668afa
DEMO MANUAL DC2668A
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
5 5
4 4
3 3
2 2
1 1
D D C C B B A A

  

 






 




 







 






 
 
 












 
 
   









6
dc2668afa
DEMO MANUAL DC2668A
 LINEAR TECHNOLOGY CORPORATION 2017
LT 0717 REV A • 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
Copyright © 2004, Linear Technology Corporation