1 dc1861af demo manual dc1861a description absolute maximum ratings LTC5567 300mhz to 4ghz active downconverting mixer with wideband if demonstration circuit 1861a is optimized for evaluation of the ltc ? 5567 active downconverting mixer. its rf and lo input ports are internally matched to 50, 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 50 match at 153mhz. the lo input is easily matched for higher or lower frequencies, as low as 300mhz, with simple external matching. the low- capacitance differential if output is usable up to 2.5ghz. design files for this circuit board are available at http://www.linear.com/demo supply voltage (v cc , if + , if C ) ..................................4.0v enable input voltage (en) ................C0.3v to v cc + 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 (t c ) ........ C40c to 105c junction temperature (t j ) .................................... 150c storage temperature range .................. C65c to 150c caution: this part is sensitive to electrostatic discharge (esd). observe proper esd precautions when handling the lt5567. l , lt, ltc, ltm, module, 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
2 dc1861af demo manual dc1861a 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 v cc pin to the 3.3v supply. connect en to the 3.3v supply. be sure to connect the v cc 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 v cc pin. 4. set the lo signal generator to provide a 1800mhz cw signal at about 0dbm to the demo boards lo port. 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 boards rf input port. the two tones should be set to about C6dbm each at the mixers rf input port. 6. set the spectrum analyzers center frequency to 150mhz. 7. perform various measurements (conversion gain, oip3, lo leakage, etc.) parts list notes on test equipment and setup ? high performance signal generators with low harmonic outputs should be used for 2-tone measurements. oth- erwise, lowpass filters at the signal generator outputs should be used to suppress harmonics. ? high quality combiners should be used to present a broadband 50 termination on all ports as well as pro- vide 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 C30dbm to C40dbm at their input. the spectrum analyzers input attenuation setting should be used to avoid saturating the instrument. set the spectrum analyzers input attenuation depending 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 analyzers internal distortion is minimized. item qty reference part description manufacturer/part number 1 2 c1, c2 cap , x7r, 0.01f, 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, 1f, 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, 50 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 , 0, 0603 nic nrc060000trf 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
3 dc1861af demo manual dc1861a 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 figure 2. single active mixer 5 5 4 4 3 3 2 2 1 1 d d c c b b a a 1 2 7 ( 6 8 1 / ( 6 6 2 7 + ( 5 : , 6 ( 6 3 ( & , ) , ( ' $ / / & $ 3 $ & , 7 2 5 6 $ 1 ' 5 ( 6 , 6 7 2 5 6 $ 5 ( 9 & & 9 & & / q + / q + & 7 % ' & 7 % ' 8 / 7 & , 8 ) 8 / 7 & , 8 ) 7 ( 0 3 * 1 ' 5 ) * 1 ' ( 1 9 & & 1 & , $ ' - * 1 ' , ) , ) * 1 ' * 1 ' 1 & / 2 * 1 ' * 1 ' 5 7 % ' 5 7 % ' - , ) - , ) & s ) & s ) - , ) - , ) 7 7 & / 1 7 7 & / 1 5 . 5 . & x ) 9 & x ) 9 5 5 ( ( 1 ( ( 1 & q ) & q ) ( 9 & & 9 w r 9 ( 9 & & 9 w r 9 & s ) & s ) ( 7 ( 0 3 ( 7 ( 0 3 ( * 1 ' ( * 1 ' - / 2 , 1 - / 2 , 1 & 7 % ' & 7 % ' & q ) & q ) & s ) & s ) & s ) & s ) / q + / q + - 5 ) , 1 - 5 ) , 1 5 . 5 .
4 dc1861af demo manual dc1861a linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2012 lt 0312 ? 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 europ ean union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or ot her 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 fro m all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory co mpliant 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 applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation
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