DEMO CIRCUIT 1431A-A QUICK START GUIDE LTC5540 600MHz to 1.3GHz HIGH DYNAMIC RANGE DOWNCONVERTING MIXER DESCRIPTION Demonstration Circuit 1431A-A is a 600MHz to The LTC5540s high conversion gain and high dy- 1.3GHz high dynamic range downconverting mixer namic range enable the use of lossy IF filters in featuring the LTC 5540. The LTC5540 is part of a high-selective receiver designs, while minimizing family of high dynamic range, passive downcon- the total solution cost, board space and system- verting mixers covering the 600MHz to 4GHz fre- level variation. quency range. The Demo Circuit 1431A-A and High Dynamic Range Downconverting Mixer Family the LTC5540 are optimized for 600MHz to DEMO IC PART RF RANGE LO RANGE 1.3GHz RF applications. The LO frequency DC1431A-A LTC5540 600MHz-1.3GHz 700MHz-1.2GHz DC1431A-B LTC5541 1.3GHz-2.3GHz 1.4GHz-2.0GHz must fall within the 700MHz to 1.2GHz range for DC1431A-C LTC5542 1.6GHz-2.7GHz 1.7GHz-2.5GHz optimum performance. DC1431A-D LTC5543 2.3GHz-4.0GHz 2.4GHz-3.6GHz The LTC5540 is designed for 3.3V operation, how- ever the IF amplifier can be powered by 5V for the Design files for this circuit board are available. Call highest P1dB. An integrated SPDT LO switch with the LTC factory. fast switching accepts two active LO signals, while providing high isolation. , LT, LTC, LTM, Linear Technology and the Linear Logo are registered trade- marks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TABLE 1. TYPICAL PERFORMANCE SUMMARY T = 25C, V = 3.3V, V = 3.3V, SHDN = Low, P = 0dBm, P = -3dBm (f = 2MHz for two-tone IIP3 tests), unless otherwise noted. A CC CCIF LO RF PARAMETER CONDITIONS VALUE UNITS V Supply Voltage Range 3.1 to 3.5 V CC V Supply Voltage Range 3.1 to 5.3 V CCIF Total Supply Current (V + V ) 193 mA CC CCIF Total Supply Current During Shutdown SHDN = High 500 A SHDN Input Low Voltage (IC On) < 0.3 V SHDN Input High Voltage (IC Off) > 3 V LOSEL Input Low Voltage (LO1 Selected) < 0.3 V LOSEL Input High Voltage (LO2 Selected) > 3 V LO Input Frequency Range 700 to 1200 MHz LO Input Return Loss Z = 50, f = 700MHz to 1200MHz > 12 dB 0 LO LO Input Power Range f = 700MHz to 1200MHz -4 to 6 dBm LO Low-Side LO 800 to 1300 RF Input Frequency Range MHz High-Side LO 600 to 1100 RF Input Return Loss Z = 50, f = 600MHz to 1300MHz > 12 dB 0 RF 1 L TC5540 TYPICAL PERFORMANCE SUMMARY, CONTINUED T = 25C, V = 3.3V, V = 3.3V, SHDN = Low, P = 0dBm, P = -3dBm (f = 2MHz for two-tone IIP3 tests), unless otherwise noted. A CC CCIF LO RF IF Output Frequency 190 MHz (Can be re-matched for other frequencies.) IF Output Return Loss > 12 dB f = 700MHz to 1200MHz LO to RF Leakage < -30 dBm LO f = 700MHz to 1200MHz LO to IF Leakage LO < -37 dBm LO1 Selected, 700MHz < f < 1200MHz LO > 50 LO Switch Isolation dB LO2 Selected, 700MHz < f < 1200MHz > 47 LO RF to LO Isolation f = 600MHz to 1300MHz > 55 dB RF RF to IF Isolation f = 600MHz to 1300MHz > 37 dB RF Low-Side LO Downmixer Application: RF = 800MHz to 1300MHz, IF = 190MHz, f = f f LO RF IF PARAMETER CONDITIONS VALUE UNITS RF = 900MHz 7.0 Conversion Gain RF = 1100MHz 7.8 dB RF = 1300MHz 8.0 RF = 900MHz 24.4 rd RF = 1100MHz Input 3 Order Intercept 24.1 dBm RF = 1300MHz 23.6 10.6 RF = 900MHz SSB Noise Figure RF = 1100MHz 10.5 dB RF = 1300MHz 10.3 f = 900MHz, f = 710MHz RF LO SSB Noise Figure Under Blocking 16.7 dB f = 1000MHz, P = 5dBm BLOCK BLOCK 2RF 2LO Output Spurious Product f = 805MHz at -10dBm, f = 710MHz -61.5 dBc RF LO (f = f + f /2) RF LO IF 3RF 3LO Output Spurious Product f = 773.33MHz at -10dBm, f = 710MHz -68 dBc RF LO (f = f + f /3) RF LO IF RF = 900MHz, V = 3.3V 11 CCIF Input 1dB Compression dBm RF = 900MHz, V = 5V 14 CCIF High-Side LO Downmixer Application: RF = 600MHz to 1100MHz, IF = 190MHz, f = f + f LO RF IF PARAMETER CONDITIONS VALUE UNITS 7.6 RF = 700MHz Conversion Gain RF = 900MHz 7.9 dB RF = 1100MHz 7.9 RF = 700MHz 26.5 rd Input 3 Order Intercept RF = 900MHz 25.9 dBm RF = 1100MHz 23.8 10.0 RF = 700MHz SSB Noise Figure RF = 900MHz 9.9 dB RF = 1100MHz 10.4 f = 900MHz, f = 1090MHz RF LO SSB Noise Figure Under Blocking 16.2 dB f = 800MHz, P = 5dBm BLOCK BLOCK 2LO 2RF Output Spurious Product f = 995MHz at -10dBm, f = 1090MHz -70 dBc RF LO (f = f f /2) RF LO IF 3LO 3RF Output Spurious Product f = 1026.67MHz at -10dBm, f = 1090MHz -75 dBc RF LO (f = f f /3) RF LO IF RF = 900MHz, V = 3.3V CCIF 11 Input 1dB Compression dBm RF = 900MHz, V = 5V 14.5 CCIF 2