general description the max2741 evaluation kit (ev kit) simplifies evalua- tion of the max2741 l1-band global positioning system (gps), radio-frequency (rf), front-end receiver ic. it enables testing of the device? rf performance and requires no additional support circuitry. the ev kit? sig- nal inputs and outputs use sma connectors to facilitate the connection of rf test equipment. features ? easy evaluation of the max2741 ? +2.7v to +3.0v single-supply operation ? all critical peripheral components included evaluates: max2741 max2741 evaluation kit ________________________________________________________________ maxim integrated products 1 19-3815; rev 0; 9/05 component list 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. ordering information part temp range ic package max2741evkit -40? to +85? 28 thin qfn-ep* d esig n a t io n q t yd esc r ipt io n c 11 2.2p f ? 0.1p f ( 0402) cap aci tor m ur ata g rm 1 555c 1h 2r2b c 2, c 3, c 4, c 8, c 10, c 23, c 27, c 33, c 47, c 50 c 54, c 60 15 0.1 f ? 10% ( 0402) cap aci tor s m ur ata g rm 1 55r61a104k c 5, c 6, c 9, c 11, c 12, c 13, c 48 7 100p f ? 5% ( 0402) cap aci tor s m ur ata g rm 1 555c 1h 1 01j c 7, c 14, c 24, c 25, c 26, c 28, c 30, c 31 0o p en c 20, c 21, c 32, c 57, c 58 5 1000p f 10% ( 0402) cap aci tor s m ur ata g rm 1 5571h 102k c 22 1 2200p f 10% ( 0402) cap aci tor tai yo y ud en u m k105bj222kw c 34 c 38, c 49 6 0.01? ? 10% ( 0402) cap aci tor s m ur ata g rm 1 55r71c 1 03k c 39, c 40 2 39p f 5% ( 0 402) cap aci tor s tai yo y ud en u m k105c h 390jw c 41 c 44 4 680p f ? 10% ( 0402) cap aci tor s tai yo y ud en u m k105bj681kw c 45, c 46 2 5.6p f ? 0.5p f ( 0402) cap aci tor s m ur ata g rm 1 555c 1h 5r6d c 59, c 62 2 1.0 f ? 10% ( 0402) cap aci tor s m ur ata g rm 1 55r60j105k j1 1 c onnector , d b25, r i g ht- ang l e m al e am p 747238- 4 d esig n a t io n q t yd esc r ipt io n j2, j10, j11, j12, j 14, j19 6 c onnector s, s m a ed g e m o unt, r ound contact johnson 142- 0701- 801 j3?9, j15 j18, j23, j24 13 1 x 2- p i n head er s, 2- p i n i nl i ne head er s, 100- m i l center s s ul l i ns p tc 36s aan j3?9, j15 j18, jp 1 12 s hunts, shor ti ng j um p er s s ul l i ns s tc 02s y an j13 0 n ot i nstal l ed jp 11 1 x 3- p i n head er , 3- p i n i nl i ne head er , 100- m i l center s ul l i ns p tc 36s aan l1 1 6.2nh ? 5% ( 0402) i nd uctor c oi l cr aft c s - 6n 2x jbw l2, l3 2 470nh ? 2% ( 0603) i nd uctor s m ur ata lqw 18an r47g 00 r1 1 3 6.5k ? ? 1% ( 0402) r esi stor r2 r5, r9 r12, r16 r19, r26 r29, r32 17 0 ? ? 5% ( 0402) r esi stor s r6, r8, r25, r33 r41 12 10k ? ? 5% ( 0 402) r esi stor s r7, r20 r24 0 o p en r30 1 30 ? ? 5% ( 0402) r esi stor * ep = exposed paddle.
evaluates: max2741 detailed description the max2741 ev kit simplifies evaluation of the max2741 gps rf receiver front-end ic. it enables testing of the device? rf performance and requires no additional sup- port circuitry. the ev kit? signal inputs and outputs use sma connectors to facilitate the connection of rf test equipment. in this section, detailed descriptions of the ev kit board as well as the control interface/software are given to facilitate better evaluation of the ic. input/output ports the max2741 ev kit has one rf input port, two if output ports, one if input port, one reference clock input port, and a gps if output port: rfin (j2) is the gps rf signal input port with sma connector 1st ifout is the output of the 1st stage 2nd ifout is the output of the 2nd stage 2nd ifin is the input to the 2nd stage refclk is the external reference clock input to the phase-locked loop gpsif is the digital output after the 3-bit analog-to- digital converter measurement configuration important notice: the ev kit board provides all neces- sary components to test the entire tuner as one receiver (rf input to the 2nd if analog output) or to indepen- dently test the 1st stage (rf input to 1st if output) and the 2nd stage (the 2nd if input to the 2nd if output). all the required passive components are provided and installed on the board. to test the entire tuner as one receiver, the user must disconnect the connections to the 1st if output sma and the 1st if input sma by removing c35, c36, c37, and c38. to test the 1st stage and the 2nd stage independently, the user must disconnect the connections to the pas- sive, interstage if filter by removing r12, c39, c40, c41, c42, c44. jumper description there are eight jumpers on the max2741 ev kit. see table 1. max2741 evaluation kit 2 _______________________________________________________________________________________ supplier phone fax alpha 360-647-2360 260-671-4936 atc 949-583-9119 949-583-9213 coilcraft 847-639-6400 847-639-1469 kayama 219-489-1533 219-489-2261 murata 770-436-1300 770-436-3030 component suppliers note: indicate you are using the max2741 when contacting these manufacturers. jumper state function 1-2 c onnect the v c c 6 p i n sup p l y to v c c . j3 n.c. c onnect the v c c 6 p i n to an exter nal sup p l y. 1-2 c onnect the v c c 1 p i n to v c c . j4 n.c. c onnect the v c c 1 p i n to an exter nal sup p l y. 1-2 c onnect the v c c 2 p i n to v c c . j5 n.c. c onnect the v c c 2 p i n to an exter nal sup p l y. 1-2 c onnect the v c c 3 p i n to v c c . j6 n.c. c onnect the v c c 3 p i n to an exter nal sup p l y. 1-2 c onnect the v c c 4 p i n to v c c . j7 n.c. c onnect the v c c 4 p i n to an exter nal sup p l y. 1-2 c onnect the v c c 5 p i n to v c c . j8 n.c. c onnect the v c c 5 p i n to an exter nal sup p l y. 1-2 c onnect to v c c . j9 n.c. c onnect an exter nal sup p l y. 1-2 n or m al op er ati on. 2-3 s hut d ow n t he m ax 2741. jp1 n.c. c ontr ol the m ax 2741 exter nal l y. table 1. jumper functions component list (continued) d esig n a t io n q t y d esc r ipt io n t1, t2, t3 3 bal un tr ansfor m er s, sur face- m o unt toko 617d b- 1675 tp 1, tp 2 0 test p oi nts, not i nstal l ed u 1 1 g p s d ow nconver ter m axi m m ax 2741e ti u 2, u 3 2 h ex b u ffer s/d r i ver s w i th op en d r ai n, 14- p i n s op texa s instr um ents s n 74lv 07ad r u 4 1 u l tr a- l ow - noi se, hi g h p s rr, l ow - d r op out l i near r eg ul ator , s c 70 m axi m m ax 8510e x k29- t y 1 1 19.2m h z vol tag e- contr ol l ed tc x o ks s /ky o c e ra v c - tc x o - 208c 5- 19p 2
quick start the max2741 ev kit is fully assembled and factory test- ed. follow the instructions in the connections and setup section for proper device evaluation. test equipment required this section lists the recommended test equipment to verify operation of the max2741. it is intended as a guide only, and some substitutions are possible. an rf signal generator capable of delivering rf power as low as -120dbm and as high as 0dbm at the 1575.42mhz operating frequency such as hp e4433b, or equivalent an rf spectrum analyzer that covers the max2741 operating frequency range, as well as a few har- monics such as fseb20, or equivalent one dc supply capable of up to 100ma at 2.6v to 3.3v power meter capable of measuring up to 0dbm one ammeter to measure the supply current (optional) ? pc with windows 98/xp connections and setup this section provides a step-by-step guide to operating the ev kit and testing the device? functions. this exam- ple assumes that you intend to test the tuner as one receiver. (see the measurement configuration in the detailed description section.) ensure that the shunts are across jumpers j3?9. connect pin 1 to pin 2 of jp1. do not turn on the dc power or rf signal gen- erators until all connections are made: 1) connect a dc supply set to +2.75v to the vdc and gnd terminals on the ev kit. do not turn on the supply. 2) connect the rf signal generator to the rfin sma connector; do not turn on the generator? output. set the output of the rf signal generator to 1575.42mhz and power level to -90dbm. 3) connect the ev kit to a pc through a parallel cable. 4) download the max2741 software from the maxim website at www.maxim-ic.com. install and run the software on an ibm-compatible pc. 5) connect the spectrum analyzer to the 2nd ifout sma connector. set the center frequency to 3.78mhz and the span to 1mhz. 6) turn on the dc power supply. the supply current should read approximately 31ma. 7) enable the rf generator? output. use the software to set the registers and send to the part. click on the test mode button, then choose lowpass filter and adc, click next, and choose observe if signal at output of lpf; then click finish. 8) the spectrum analyzer should display a tone at 3.78mhz at approximately -8dbm. layout issues a good pc board layout is an essential part of rf cir- cuit design. the ev kit pc board can serve as a guide for laying out a board using the max2741. keep traces carrying rf signals as short as possible to minimize radiation and insertion loss. use impedance control on all rf signal traces. bypass the vcc node of the pc board with capacitors to the closest ground. evaluates: max2741 max2741 evaluation kit _______________________________________________________________________________________ 3 windows is a registered trademark of microsoft corp.
evaluates: max2741 max2741 evaluation kit 4 _______________________________________________________________________________________ figure 1. max2741 ev kit schematic
evaluates: max2741 max2741 evaluation kit _______________________________________________________________________________________ 5 figure 2. max2741 ev kit component placement guide component side 1.0" figure 3. max2741 ev kit pc board layout?ayer 2 1.0"
evaluates: max2741 max2741 evaluation kit 6 _______________________________________________________________________________________ figure 4. max2741 ev kit pc board layout?ayer 3 1.0" figure 5. max2741 ev kit pc board layout?omponent side 1.0"
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 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. evaluates: max2741 max2741 evaluation kit figure 6. max2741 ev kit pc board layout?econdary side 1.0" springer
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