Linear Technology LTC5548 Quick setup guide

1
dc2461af
DEMO MANUAL DC2461A
Description Absolute MAxiMuM input
rAtings
LTC5548
2GHz to 14GHz Microwave
Mixer with Low IF Frequency
Demonstration circuit 2461A is optimized for evaluation
of the LT C
®
5548 passive double-balanced mixer with
integrated LO frequency doubler. Its RF port is matched
to 50Ω from 2GHz to 13.6GHz with 9dB return loss, and
the LO port is matched to 50Ω from 1GHz to 12GHz with
10dB return loss. The differential IF port is usable from
DC to 6GHz. The LTC5548 can be used for upconverting
and downconverting applications.
The internal LO doubler can be enabled to allow operation
with a lower frequency LO input signal such as that from
the LTC6945/LTC6946 or LTC6947/LTC6948 family of
frequency synthesizers.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2461A
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. DC2461A
Supply Voltage (EN)....................................................4V
Enable Input Voltage (EN) ................–0.3V to VCC + 0.3V
LO Input Power (1GHz to 12GHz).........................10dBm
LO Input DC Voltage............................................... ±0.1V
RF Input Power (2GHz to 14GHz).........................20dBm
RF Input DC Voltage............................................... ±0.1V
IF Input Power (LF to 6GHz).................................20dBm
IF Input DC Voltage ................................................ ±0.1V
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 LTC5548.

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dc2461af
DEMO MANUAL DC2461A
proper test setups
Figure 2. Test Setup for Downconverting Mixer 2-Tone Measurements
Figure 3. Test Setup for Upconverting Mixer 2-Tone Measurements

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dc2461af
DEMO MANUAL DC2461A
Quick stArt proceDure
notes on test eQuipMent AnD setup
•High performance signal generators with lowharmonic
outputs should be used for 2-tone measurements.
Otherwise, 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 at-
tenuator pads further improves source isolation and
helps prevent the signal generators from producing
intermodulation 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
system performance should be evaluated toensure 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 VCC turrets to the power sup-
ply. 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 5560MHz CW
signal at about 0dBm to the demo board’s LO port.
6. Set the RF signal generators to provide one 5799MHz
CW signal and one 5801MHz 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. Setthespectrumanalyzer’scenterfrequencyto240MHz
with a span of 10MHz.
8. Perform various measurements
(Conversion Gain, OIP3, LO leakage, etc.)

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DEMO MANUAL DC2461A
pArts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C1, C3 CAP, 0.15pF, 100V, ±0.01pF, 0402 AVX, 04021JR15ZBS
2 2 C2, C4 CAP, 22pF, C0G, 50V, 5%, 0402 AVX, 04025A220JAT2A
3 1 C5 CAP, 1µF, X7R, 10V, 10%, 0603 AVX, 0603ZD105KAT2A
4 4 E1 TO E4 TEST POINT, TURRET, 0.061" MTG HOLE MILL-MAX, 2308-2-00-80-00-00-07-0
5 3 J1 TO J3 CONN, SMA 50Ω EDGE-LAUNCH E F JOHNSON, 142-0701-851
6 1 T1 TRANS, MINI-CIRCUITS 4.5MHz TO 3000MHz MINI-CIRCUITS TC1-1-13M+
7 1 U1 IC LTC5548IUDB, QFN 12 PIN, 3mm × 2mm LINEAR TECHNOLOGY CORPORATION, LTC5548IUDB#PBF

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dc2461af
DEMO MANUAL DC2461A
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

VCC
E4

J3
IF
T1


6
3
4
12
C5
1uF

12
J2
LO
E2
GND
E3

J1
RF
C2
22pF
1 2
U1
LTC5548
GND 1
IF+ 2
IF- 3
GND
4
RF
5
GND
6
EN
7
X2
8
VCC
9
GND 10
LO 11
GND 12
GND 13
C1
0.15pF
1 2
E1
Vcc

C3
0.15pF
1 2
C4
22pF
12

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dc2461af
DEMO MANUAL DC2461A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 0116 • 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

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