DEMO MANUAL DC1861A
LTC5567
300MHz to 4GHz Active Downconverting
Mixer with Wideband IF
DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
Demonstration circuit 1861A is optimized for evaluation
of the LTC®5567 active downconverting mixer. Its RF
and LO input ports are internally matched to 50Ω, from
1.4GHz to 3GHz, and from 1GHz to 4GHz, respectively.
The IF output uses a bandpass network followed by an 8:1
transformer to provide a 50Ω match at 153MHz. The LO
input is easily matched for higher or lower frequencies, as
low as 300MHz, with simple external matching. The lowcapacitance differential IF output is usable up to 2.5GHz.
Supply Voltage (VCC, IF+, IF –) ..................................4.0V
Enable Input Voltage (EN) ................–0.3V to VCC + 0.3V
LO Input Power (350MHz to 4.5GHz) ................. +10dBm
LO Input DC Voltage............................................... ±0.1V
RF Input Power (300MHz to 4GHz) .................... +15dBm
RF Input DC Voltage ............................................... ±0.1V
TEMP Monitor Input Current ..................................10mA
Operating Temperature Range (TC) ........ –40°C to 105°C
Junction Temperature (TJ) .................................... 150°C
Storage Temperature Range .................. –65°C to 150°C
Design files for this circuit board are available at
http://www.linear.com/demo
CAUTION: This part is sensitive to electrostatic discharge
(ESD). Observe proper ESD precautions when handling
the LT5567.
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
BOARD PHOTO
Figure 1. Test Setup for Mixer Two-Tone Measurements
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DEMO MANUAL DC1861A
NOTES ON TEST EQUIPMENT AND SETUP
• High performance signal generators with low harmonic
outputs should be used for 2-tone measurements. Otherwise, lowpass 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. Attenuator pads may
be used on the inputs to the combiner and the RF input
port of the LTC5567 mixer shown in Figure 1. Adding
attenuator 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 depending on
the spectrum analyzer used.
• Before performing measurements on the DUT, the system performance should be evaluated to ensure that
a clean input signal is obtained and that the spectrum
analyzer’s internal distortion is minimized.
QUICK START PROCEDURE
1. Connect all test equipment as shown in Figure 1.
2. Set the power supply output voltage to 3.3V, and set
the current limit to 150mA.
3. Connect the VCC pin to the 3.3V supply. Connect EN
to the 3.3V supply. BE SURE TO CONNECT THE VCC
PIN BEFORE THE EN PIN TO ENSURE THAT THE PART
DOES NOT GET DAMAGED. ALSO, REMOVE POWER
FROM EN PIN BEFORE REMOVING POWER FROM
THE VCC PIN.
5. Set the RF signal generators to provide one 1950MHz
CW signal and one 1951MHz 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 about
–6dBm each at the mixer’s RF input port.
6. Set the spectrum analyzer’s center frequency to 150MHz.
7. Perform various measurements (Conversion Gain, OIP3,
LO leakage, etc.)
4. Set the LO signal generator to provide a 1800MHz CW
signal at about 0dBm to the demo board’s LO port.
PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
1
2
C1, C2
CAP, X7R, 0.01μF, 25V, 10%, 0402
AVX, 04023C103KAT
2
1
C3
CAP, NPO, 2.7pF, 50V, 5%, 0402
AVX, 04025A2R7JAT
3
0
C4, C6
TBD, 0402
4
1
C5
CAP, NPO, 3.9pF, 50V, 5%, 0402
AVX, 04025A3R9JAT
5
2
C7, C8
CAP, NPO, 330pF, 16V, 5%, 0402
AVX, 0402YA331JAT
6
1
C9
CAP, X7R, 1μF, 10V, 10%, 0603
AVX, 0603ZC105KAT
7
4
E1-E4
TESTPOINT, TURRET, 0.063" PBF
MILL-MAX, 2308-2-00-80-00-00-07-0
8
4
J1-J4
CONN, SMA, 50Ω EDGE-LANCH
E. F. JOHNSON, 142-0701-851(PBF)
9
2
L1, L2
INDUCTOR, WIREWOUND, 300nH, ±5%, 0603
COILCRAFT, 0603HP-R30XJLW
10
2
R1, R2
RES, CHIP, 3.01k, 1/16W, 1% 0402
VISHAY, CRCW04023K01FKED
11
0
R3
TBD, 0402
12
1
R4
RES, CHIP, 0Ω, 0603
13
1
T1
RF TRANSFORMER, TC8-1-10LN+
MINI-CIRCUITS, TC8-1-10LN+
14
1
U1
I.C. LTC5567IUF, QFN 16 PIN, 4mm × 4mm
LINEAR TECH. INC., LTC5567IUF
NIC NRC060000TRF
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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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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DEMO MANUAL DC1861A
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1861A
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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Linear Technology Corporation
LT 0312 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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