general description the max2385/max2386 evaluation kits (ev kits) simpli- fy evaluation of the max2385/max2386. the ev kits allow the evaluation of the cdma and gps low-noise amplifiers (lna), as well as the cdma and gps down- converter mixers, without the use of any additional sup- port circuitry. the signal inputs and outputs use sma connectors to simplify the connection of rf test equip- ment. the max2385/max2386 ev kits are assembled with an associated ic and incorporate input and output match- ing components optimized for rf frequencies from 832mhz to 870mhz and an if frequency of 110mhz. features +2.7v to +3.6v operation 50 ? sma inputs and outputs on rf, if, and lo ports for easy testing all matching components included fully assembled and tested evaluate: max2385/max2386 max2385/max2386 evaluation kits ________________________________________________________________ maxim integrated products 1 designation qty description c27 1 22 f 10% tantalum capacitor, c case avx tajc226k016 c28 1 1.8pf 0.1pf ceramic capacitor (0402) murata grm36cog1r8b050a j1, j2, j3, j5, j9, j11, j12 7 sma edge mounts efjohnson 142-0701-801 j4, j7, j10 3 sma pc mounts efjohnson 142-0701-201 ju1, ju2, ju3, ju8 4 1 ? 2 headers (0.1in centers) digi-key s1012-36-nd ju4?u7 4 1 ? 3 headers (0.1in centers) digi-key s1012-36-nd ju1?u9 9 shunts digi-key s9000-nd l2, l3, l10, l11 4 180nh 5% inductors toko 1608-fsr18j l4 1 2.7nh 0.3nh inductor toko 1608-fs2n7s l5, l6 2 5.6nh 0.3nh inductors toko 1608-fs5n6s l7 1 22nh 2% inductor murata lqw1608a22ng00 l8 1 3.9nh 0.3nh inductor toko 1608 fs3n9s component list ordering information 19-2205; rev 0; 10/01 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ucsp is a trademark of maxim integrated products, inc. part temp. range ic package max2385 evkit -40 c to +85 c5 ? 4 ucsp max2386 evkit -40 c to +85 c5 ? 4 ucsp designation qty description c1, c42 2 1000pf 10% ceramic capacitors (0402) murata grm36x7r102k050a c3, c4, c39, c40 4 7.0pf 0.1pf ceramic capacitors (0402) murata grm36cog070b050a c5, c6, c13, c37, c38 5 0.5pf 0.1pf ceramic capacitors (0402) murata grm36cog0r5b050a c7, c8, c22, c24, c30, c34, c35 7 100pf 5% ceramic capacitors (0402) murata grm36cog101j050a c9, c26 2 0.01 f 10% ceramic capacitors (0402) murata grm36x7r103k016a c12 1 3.0pf 0.1pf ceramic capacitor (0402) murata grm36cog030b050a c16, c23, c29, c33 4 6.8nf 10% ceramic capacitors murata grm36cog682b050a c19 1 2.2pf 0.1pf ceramic capacitor (0402) murata grm36cog2r2b050a c25, c32 2 2.0pf 0.1pf ceramic capacitors murata grm36cog020b050a
quick start the max2385/max2386 ev kits are fully assembled and factory tested. follow the instructions in the connections and setup section for proper device eval- uation. test equipment required table 1 lists the required test equipment to verify max2385/max2386 operation. it is intended as a guide only, and some substitutions are possible. connections and setup this section provides a step-by-step guide to operating the ev kits and testing the devices functions. ensure that the shunts across jumpers iclna (ju1), iglna (ju2), icmix (ju8), and igmix (ju3) are installed. do not turn on dc power or rf signal generators until all connections are made. testing the supply current 1) connect a dc supply set to +2.75v (through an ammeter, if desired) to the v cc and gnd terminals on the ev kit. if available, set the current limit to 40ma. do not turn on the supply. 2) set the shunt across buff (ju7) to off. see table 2 for positions of the shunts across g1, g2, and mode for the different modes of operation. 3) turn on the dc supply; the supply current should read approximately 0ma (shutdown mode), 9.6ma (gps mode, max2385), 16.9ma (gps mode, max2386), 3.7ma (ulg mode), 6.5ma (lg mode), 10.3ma (mg mode), 12.5ma (hgll mode), and 17.4ma (hghl mode). 4) set the shunt across buff (ju7) to on. this should increase the current consumption in each mode by 5.2ma. testing the cdma lna 1) connect a dc supply set to +2.75v (through an ammeter if desired) to the v cc and gnd terminals on the ev kit. if available, set the current limit to 40ma. do not turn on the supply. 2) see table 2 for positions of the shunts across g1, g2, and mode for the different cdma lna modes. 3) connect one rf signal generator to the clnain sma connector. do not turn on the generator s out- put. set the generator to an output frequency of 851mhz and set the generator power level to -30dbm. 4) connect the spectrum analyzer to the clnaout sma connector. set the spectrum analyzer to a cen- ter frequency of 851mhz and a total span of 10mhz. 5) turn on the dc supply, then activate the rf genera- tor s output. an 851mhz signal shown on the spec- trum analyzer display should indicate a magnitude of approximately -15dbm (hghl mode), -16dbm (hgll mode), -29dbm (mg mode), and -35dbm (lg mode). be sure to account for cable losses (between 0.5db and 2db) and circuit board losses (approxi- mately 0.5db) when computing gain and noise figure. 6) (optional) another method for determining gain is by using a network analyzer. this has the advantage of evaluate: max2385/max2386 max2385/max2386 evaluation kits 2 _______________________________________________________________________________________ supplier phone fax avx 843-448-9411 843-448-1943 murata 770-436-1300 770-436-3030 toko 408-432-8281 408-943-9790 component suppliers designation qty description l9 1 10nh 2% inductor murata lqw1608a10ng00 r2, r3, r4, r10 40 ? 1% resistors (0402) r5 1 47.5k ? 1% resistor (0402) r6, r7 2 69.8 ? 1% resistors (0402) r8 1 20k ? 1% resistor (0402) t1, t2 2 transformers macom etc1-1t u1 1 max2385ebp/max2386ebp 5 ? 4 ucsp vcc, gnd, tp1 3 test points digi-key 5000k-nd component list (continued) equipment description rf signal generators capable of delivering at least 0dbm of output power up to 1.6ghz (hp 8648c or equivalent) rf spectrum analyzer capable of covering the operating frequencies of the device, as well as a few harmonics (hp 8561e or equivalent) power supply capable of up to 40ma at +2.7v to +3.6v power meter capable of measuring up to 20dbm ammeter to measure supply current (optional) network analyzer to measure small-signal return loss and gain (optional, hp 8753d or equivalent) table 1. required test equipment
displaying gain over a swept frequency band, in addition to displaying input and output return loss. refer to the network analyzer manufacturer s user manual for setup details. testing the gps lna 1) connect a dc supply set to +2.75v (through an ammeter, if desired) to the v cc and gnd terminals on the ev kit. if available, set the current limit to 40ma. do not turn on the supply. 2) set the shunt across mode to hi, across g1 to lo, and across g2 to hi. this places the device in gps mode (see table 2). 3) connect one rf signal generator to the glnain sma connector. do not turn on the generator s out- put. set the generator to an output frequency of 1575.42mhz and set the generator power level to -30dbm. 4) connect the spectrum analyzer to the glnaout sma connector. set the spectrum analyzer to a cen- ter frequency of 1575.42mhz and a total span of 10mhz. 5) turn on the dc supply and activate the rf genera- tor s output. a 1575.42mhz signal shown on the spectrum analyzer display should indicate a magni- tude of approximately -12dbm (max2385) or -10dbm (max2386). be sure to account for cable losses (between 0.5db and 2db) and circuit board losses (approximately 0.5db) when computing gain and noise figure. 6) (optional) another method for determining gain is by using a network analyzer. this has the advantage of displaying gain over a swept frequency band, in addition to displaying input and output return loss. refer to the network analyzer manufacturer s user manual for setup details. testing the cdma mixer 1) connect a dc supply set to +2.75v (through an ammeter if desired) to the v cc and gnd terminals on the ev kit. if available, set the current limit to 40ma. do not turn on the supply. 2) see table 2 for positions of the shunts across g1, g2, and mode for the different cdma mixer modes. 3) connect one rf signal generator to the lo_in sma connector. do not turn on the generator output. set the frequency to 1482mhz, and output power to -10dbm. this is the lo signal. 4) connect another rf signal generator to the cmixin sma connector. do not turn on the generator output. set the signal generator to 851mhz and output power level to -30dbm. 5) connect the spectrum analyzer to the cif sma con- nector. set the spectrum analyzer to a center fre- quency of 110mhz and a total span of 10mhz. 6) turn on the dc supply and the signal generator out- puts. 7) a 110mhz signal shown on the spectrum analyzer display should indicate a magnitude of approximately -19dbm (hghl/hgll mode), -19dbm (mg mode), -20dbm (lg mode), or -27dbm (ulg mode). be sure to account for cable losses (between 0.5db and 2db) and circuit board losses (approximately 0.5db) when computing gain and noise figure. evaluate: max2385/max2386 max2385/max2386 evaluation kits _______________________________________________________________________________________ 3 function control pins lna mixer modes g1 g2 mode hghl hgll mg lghl gps hg mg lg ulg gps high gain, high linearity (hghl) 00 1 high gain, low linearity (hgll) 11 0 midgain (mg) 1 0 1 low gain (lg) 1 1 1 ultra-low gain (ulg) 10 0 gps 0 1 1 shutdown (shdn) 0x table 2. mode selection truth table
evaluate: max2385/max2386 testing the gps mixer 1) connect a dc supply set to +2.75v (through an ammeter, if desired) to the v cc and gnd terminals on the ev kit. if available, set the current limit to 40ma. do not turn on the supply. 2) set the shunt across mode to hi, across g1 to lo, and across g2 to hi. this places the device in gps mode (see table 2). 3) connect one rf signal generator to the lo_in sma connector. do not turn on the generator output. set the frequency to 1465.42mhz, and output power to -10dbm. this is the lo signal. 4) connect another rf signal generator to the gmixin sma connector. do not turn on the generator output. set the signal generator to 1575.42mhz and output power level to -30dbm. 5) connect the spectrum analyzer to the gif sma con- nector. set the spectrum analyzer to a center fre- quency of 110mhz and a total span of 10mhz. 6) turn on the dc supply and the signal generator out- puts. 7) a 110mhz signal shown on the spectrum analyzer display should indicate a magnitude of approximate- ly -18dbm (max2385) or -17dbm (max2386). be sure to account for cable losses (between 0.5db and 2db) and circuit board losses (approximately 0.5db) when computing gain and noise figure. testing the lo output buffer 1) connect a dc supply set to +2.75v (through an ammeter, if desired) to the v cc and gnd terminals on the ev kit. if available, set the current limit to 40ma. do not turn on the supply. 2) set the shunt across jumper buff (ju7) to on. 3) connect one rf signal generator to the lo_in sma connector. do not turn on the generator output. set the frequency to 1482mhz, and output power to -10dbm. 4) connect the spectrum analyzer to the lo_out sma connector. set the spectrum analyzer to a center fre- quency of 741mhz and a total span of 10mhz. 5) turn on the dc supply and the signal generator out- puts. 6) a 741mhz signal shown on the spectrum analyzer display should indicate a magnitude of approximately -14dbm. be sure to account for cable losses (between 0.5db and 2db), the 7.4db 100 ? to 50 ? matching pad, and circuit board losses (approxi- mately 0.5db) when computing gain and noise figure. layout the ev kit s pc board can serve as a guide for laying out a circuit board using the max2385/max2386. keep rf signal lines as short as possible to minimize losses and radiation. always use controlled-impedance lines on all high-frequency inputs and outputs and use low-inductance connections to ground on all gnd pins. at the mixer outputs, keep the differential lines together and of the same length to ensure signal balance. max2385/max2386 evaluation kits 4 _______________________________________________________________________________________
evaluate: max2385/max2386 max2385/max2386 evaluation kits _______________________________________________________________________________________ 5 figure 1. max2385/2386 ev kit schematic j3 c1 1000pf j2 c13 0.5pf j5 c29 6.8nf j1 c12 3pf 5 4 1 3 2 c4 7.0pf c3 7.0pf l2 180nh l3 180nh c6 0.5pf c5 0.5pf c7 100pf v cc 21 ju3 igmix l4 2.7nh v cc 21 ju2 t1 iglna 21 ju1 iclna c8 100pf c9 0.01 f c22 100pf r3 0 ? l6 5.6nh v cc v cc ju5 1 2 3 hi lo g1 r4 0 ? l8 3.9nh c28 1.8pf j9 c33 6.8nf l9 10nh c32 2pf indo603 r5 47.5k ? v cc v cc ju6 1 2 3 hi lo g2 r10 0 ? v cc ju7 1 2 3 on off buff r8 20k ? v cc ju4 1 2 3 hi lo mode r2 0 ? c27 22 f c34 100pf c26 0.01 f j6 j8 j10 c30 100pf j12 c24 100pf r6 69.8 ? r7 69.8 ? j11 t2 c42 1000pf 5 4 1 3 2 c39 7.0pf c40 7.0pf l11 180nh l10 180nh c37 0.5pf c38 0.5pf c35 100pf v cc 2 1 ju8 icmix j7 c23 6.8nf l7 22nh c25 2.0pf j4 c16 6.8nf l5 5.6nh c19 2.2pf glnaout clnaout g1 glnain gnd rbias clnain g2 v cc gnd gif+ gif- mode gmixin cmixin gnd cif+ cif- lo_out lo_in a1 b1 b2 c1 d1 a2 a4 b3 a3 a5 c2 d2 c3 d3 d4 b5 c4 b4 c5 d5 tp1 max2385 u1
evaluate: max2385/max2386 max2385/max2386 evaluation kits 6 _______________________________________________________________________________________ figure 2. max2385/max2386 ev kit component placement guide?omponent side figure 3. max2385/max2386 ev kit component placement guide?older side figure 4. max2385/max2386 ev kit pc board layout?round plane 1 figure 5. max2385/max2386 ev kit pc board layout?omponent side 1.0" 1.0" 1.0" 1.0"
evaluate: max2385/max2386 max2385/max2386 evaluation kits maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 _____________________ 7 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. figure 6. max2385/max2386 ev kit pc board layout figure 7. max2385/max2386 ev kit pc board layout figure 8. max2385/max2386 ev kit pc board layout component side figure 9. max2385/max2386 ev kit pc board layout?older side 1.0" 1.0" 1.0" 1.0"
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