DEMO MANUAL DC2461A LTC5548 2GHz to 14GHz Microwave Mixer with Low IF Frequency Description Absolute Maximum INput Ratings Demonstration circuit 2461A is optimized for evaluation of the LTC®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. 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. Board Layout Figure 1. DC2461A dc2461af 1 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 dc2461af 2 DEMO MANUAL DC2461A Notes On Test Equipment and Setup • High performance signal generators with low harmonic 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 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 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 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. 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. Set the spectrum analyzer’s center frequency to 240MHz with a span of 10MHz. 8. Perform various measurements (Conversion Gain, OIP3, LO leakage, etc.) 5. Set the LO signal generator to provide a 5560MHz CW signal at about 0dBm to the demo board’s LO port. dc2461af 3 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 dc2461af 4 5 4 DEMO MANUAL DC2461A 3 2 1 Schematic Diagram IF 4 J3 6 T1 4 GND 1 2 GND 12 U1 5 LTC5548 LO 2 1 GND 1 10 C3 0.15pF 13 VCC E3 E1 4 3 C2 22pF C5 1uF 2 1 E4 1 Vcc 2 5 J2 22pF 9 X2 VCC GND EN GND 8 6 7 LO 2 RF C4 11 2 C1 0.15pF 1 J1 1 GND RF 2 IF+ IF- 3 3 E2 GND 2 1 dc2461af 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. 5 DEMO MANUAL DC2461A 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 dc2461af 6 Linear Technology Corporation LT 0116 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016