general description the MAX2043 evaluation kit (ev kit) simplifies the evalu- ation of the MAX2043 umts/wcdma, dcs, pcs, and wimax base-station up/downconversion mixer. it is fully assembled and tested at the factory. standard 50 ? sma connectors are included on the ev kit? input and output ports to allow quick and easy evaluation on the test bench. this document provides a list of test equipment required to evaluate the device, a straight-forward test procedure to verify functionality, a description of the ev kit circuit, the circuit schematic, a bill of materials (bom) for the kit, and artwork for each layer of the pc board. features fully assembled and tested 50 ? sma connectors on input and output ports 1700mhz to 3000mhz rf frequency range 1900mhz to 3000mhz lo frequency range dc to 350mhz if frequency range 7.5db conversion loss +31dbm input ip3 (downconversion) +23dbm input 1db compression point 7.8db noise figure integrated lo buffer integrated rf and lo baluns low -3dbm to +6dbm lo drive built-in spdt lo switch with 43db lo1 to lo2 isolation and 50ns switching time external current-setting resistor provides option for operating mixer in reduced-power/reduced- performance mode evaluates: MAX2043 MAX2043 evaluation kit ________________________________________________________________ maxim integrated products 1 19-0570; rev 0; 5/06 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 MAX2043evkit -40? to +85? 36 thin qfn-ep* designation qty description c1 1 4pf ?.25pf, 50v c0g ceramic capacitor (0402) murata grm1555c1h4r0c c2, c4, c6, c8 4 22pf 5%, 50v c0g ceramic capacitors (0402) murata grm1555c1h220j c3 0 not installed (0603) c5, c7, c9 3 0.01? ?0%, 25v x7r ceramic capacitors (0402) murata grm155r71e103k j1?4 4 pc board edge-mount sma rf connectors (flat-tab launch) johnson 142-0741-856 designation qty description r1 1 357 ? ?% resistor (0402) r2 1 47k ? ?% resistor (0603) t1 1 1:1 transformer (50:50) m/a-com mabaes0029 tp1 1 large test point for 0.062in pc board (red) mouser 151-107-rc or equivalent tp2 1 large test point for 0.062in pc board (black) mouser 151-103-rc or equivalent tp3 1 large test point for 0.062in pc board (white) mouser 151-101-rc or equivalent * ep = exposed paddle. component suppliers supplier phone website johnson 507-833-8822 www.johnsoncomponents.com m/a-com 800-366-2266 www.macom.com murata 770-436-1300 www.murata.com note: indicate that you are using the MAX2043 when contact- ing these component suppliers.
evaluates: MAX2043 MAX2043 evaluation kit 2 _______________________________________________________________________________________ quick start the MAX2043 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 the operation of the MAX2043. it is intended as a guide only, and substitutions may be possible: ? dc supply capable of delivering +5.0v and 175ma ? three rf signal generators capable of delivering 10dbm of output power in the 1ghz to 3ghz frequency range (i.e., hp 8648) ? rf spectrum analyzer with a minimum 100khz to 3ghz frequency range (hp 8561e) ? rf power meter (hp 437b) ? power sensor (hp 8482a) connections and setup this section provides a step-by-step guide to testing the basic functionality of the ev kit. as a general pre- caution to prevent damaging the outputs by driving high-vswr loads, do not turn on dc power or rf signal generators until all connections are made. this procedure is specific to operation in the us pcs band (reverse channel: 1850mhz to 1910mhz), high- side injected lo for a 200mhz if. choose the test fre- quency based on the particular system? frequency plan, and adjust the following procedure accordingly. see figure 1 for the mixer test setup diagram: 1) calibrate the power meter for 2100mhz. for safety margin, use a power sensor rated to at least +20dbm, or use padding to protect the power head as necessary. 2) connect 3db pads to dut ends of each of the two rf signal generators?sma cables. this padding improves vswr and reduces the errors due to mis- match. 3) use the power meter to set the rf signal generators according to the following: rf signal source: 0dbm into dut at 1900mhz (this will be about +3dbm before the 3db pad). lo1 signal source: 0dbm into dut at 2100mhz (this will be about +3dbm before the 3db pad). lo2 signal source: 0dbm into dut at 2101mhz (this will be about +3dbm before the 3db pad). 4) disable the signal generator outputs. 5) connect the rf source (with pad) to the rf port. 6) connect the lo1 and lo2 signal sources to the ev kit? lo1 and lo2 inputs, respectively. 7) measure the loss in the 3db pad and cable that will be connected to the if port. losses are frequency dependent, so test this at 200mhz (the if frequency). use this loss as an offset in all output power/gain cal- culations. 8) connect this 3db pad to the ev kit? if port connec- tor and connect a cable from the pad to the spec- trum analyzer. 9) set the dc supply to +5.0v, and set a current limit of around 175ma if possible. disable the output voltage and connect the supply to the ev kit (through an ammeter, if desired). enable the sup- ply. readjust the supply to get +5.0v at the ev kit. there will be a voltage drop across the ammeter when the mixer is drawing current. 10) select lo2 by connecting losel (tp3) to gnd. 11) enable the lo and the rf sources. testing the mixer adjust the center and span of the spectrum analyzer to observe the if output tone at 201mhz. the level should be about -10.5dbm (7.5db conversion loss, 3db pad loss). the spectrum analyzer? absolute magnitude accuracy is typically no better than ?db. use the power meter to get an accurate output power measurement. disconnect the gnd connection to losel. it will be pulled high by a pullup resistor on the board to select lo1. observe that the 200mhz signal increases while the 201mhz decreases. reconfigure the test setup using a combiner or hybrid to sum the two lo inputs to do a two-tone ip3 measure- ment if desired. terminate the unused lo input in 50 ? . component list (continued) designation qty description u1 1 active dual-mixer ic (6mm x 6mm, 36-pin tqfn with exposed paddle) maxim MAX2043etx+ note: u1 has an exposed paddle conductor that requires it to be solder attached to a grounded pad on the circuit board to ensure a proper electrical/thermal design. + denotes lead-free package.
detailed description the MAX2043 is a high-linearity up/downconverter inte- grated with rf and lo baluns, an lo buffer, and an spdt lo input select switch. the ev kit circuit uses the MAX2043 and consists mostly of supply-decoupling capacitors, dc-blocking capacitors, a current-setting resistor, and an if balun. the MAX2043 ev kit circuit allows for thorough analysis and a simple design-in. supply-decoupling capacitors capacitor c4 is a 22pf supply-decoupling capacitor used to filter high-frequency noise. capacitors c5, c7, and c9 are larger 0.01? used for filtering lower frequen- cy noise on the supply. dc-blocking capacitors the MAX2043 has internal baluns at the rf and lo inputs. these inputs have almost 0 ? resistance at dc, and so dc-blocking capacitors c1, c6, and c8 are used to prevent any external bias from being shunted directly to ground. lo bias bias current for the integrated lo buffer is set with resistor r1 (357 ? ?%). the dc current of the device can be reduced by increasing the value of r1 but the device would operate at reduced performance levels (see the modifying the ev kit section). tap network capacitor c3 helps to terminate the second-order inter- modulation products. if the MAX2043 mixer has an if frequency range of dc to 350mhz. note that these differential ports are ideal for providing enhanced iip2 performance. single- ended if applications require a 1:1 balun to transform the 50 ? differential output impedance to a 50 ? single- ended output. after the balun, the if return loss is bet- ter than 15db. the differential if is used as an input port for upconverter operation. the user can use a dif- ferential if amplifier following the mixer, but a dc block is required on both if pins. in this configuration, the if+ and if- pins need to be returned to ground through a high resistance (about 1k ? ). this ground return can also be accomplished by grounding the rf tap (pin 8) and ac-coupling the if+ and if- ports (pins 13 and 14). losel the ev kit includes a 47k ? pullup resistor (r2) for easy selection of the lo port. providing a ground at tp3 selects lo2, and leaving tp3 open selects lo1. to drive tp3 from an external source, follow the limits called out in the MAX2043 device data sheet. logic voltages should not be applied to losel without the +5v supply voltage. doing so can cause the on-chip esd diodes to conduct and could damage the device. layout considerations the MAX2043 evaluation board can be a guide for your board layout. pay close attention to thermal design and close placement of components to the ic. the MAX2043 package exposed paddle (ep) conducts heat from the device and provides a low-impedance electrical connection to the ground plane. the ep must be attached to the pc board ground plane with a low thermal and electrical impedance contact. ideally, this is achieved by soldering the backside of the package directly to a top metal ground plane on the pc board. alternatively, the ep can be connected to an internal or bottom-side ground plane using an array of plated vias directly below the ep. the MAX2043 ev kit uses nine evenly spaced 0.016in-diameter, plated through holes to connect the ep to the lower ground planes. depending on the ground-plane spacing, large sur- face-mount pads in the if path may need to have the ground plane relieved under them to reduce parasitic shunt capacitance. modifying the ev kit the rf, lo, and if ports are broadband matched, so there is no need to modify the circuit for use anywhere in the 1700mhz to 3000mhz rf range, 1900mhz to 3000mhz lo range, and 50mhz to 350mhz if range. the dc current of the device can be reduced if reduced performance is acceptable. reducing the current is accomplished by increasing the value of r1. doubling the value of r1 reduces the dc current approximately in half. approximately 10% of the overall ic current is used for basic operation of the device (r1 set at 357 ? ) and cannot be reduced. evaluates: MAX2043 MAX2043 evaluation kit _______________________________________________________________________________________ 3
evaluates: MAX2043 MAX2043 evaluation kit 4 _______________________________________________________________________________________ - + - + power supply 3-out, hpib (ag e3631a) rf signal generator (hp 8648b) rf power meter (giga 80701a, hp 437b) rf high- power sensor (ammeter) 3db 3db 3db 3db lo2 rf lo1 if +5v gnd MAX2043evkit rf signal generator (hp 8648b) rf signal generator (hp 8648b) 1900.000mhz 2100.000mhz 2101.000mhz 5.0v, 175ma (max) rf spectrum analyzer (hp 8561x) bench multimeter hpib (hp 34401a) 108ma gnd open losel figure 1. test setup diagram
evaluates: MAX2043 MAX2043 evaluation kit _______________________________________________________________________________________ 5 5 4 3 2 1 3 t1 1 5 4 36 35 34 33 u1 32 31 30 29 28 gnd gnd rf vcc MAX2043 10 11 12 13 14 15 16 17 18 9 8 7 6 23 24 25 26 27 19 20 21 22 c1 4pf c8 22pf r2 47k ? c4 22pf c3 open gnd gnd gnd gnd gnd gnd v cc c9 0.01 f gnd gnd gnd gnd gnd v cc gnd rftap vcc c5 0.01 f note: pins 1?, 7, 10, 11, 12, 15, 18, 20, 22, 24, 25, 26, 28, 29, 31?6 of u1 have no internal connections. these pins can be connected back to the grounded exposed paddle where possible to improve pin-to-pin isolation. v cc r1 357 ? c7 0.01 f vcc v cc vcc gnd gnd lo2 gnd gnd gnd losel c2 22pf j1 sma rf j2 sma lo2 tp3 losel c6 22pf exposed paddle lo1 j3 sma lo1 j4 sma if gnd gnd gnd gnd lo_adj if+ if- v cc gnd tp2 gnd vcc tp1 +5v figure 2. MAX2043 ev kit schematic
evaluates: MAX2043 MAX2043 evaluation kit 6 _______________________________________________________________________________________ figure 3. MAX2043 ev kit pc board layout?op silkscreen figure 4. MAX2043 ev kit pc board layout?op soldermask figure 5. MAX2043 ev kit pc board layout?op layer metal figure 6. MAX2043 ev kit pc board layout?nner layer 2 (gnd)
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 2006 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. evaluates: MAX2043 MAX2043 evaluation kit heaney figure 7. MAX2043 ev kit pc board layout?nner layer 3 (routes) figure 8. MAX2043 ev kit pc board layout?ottom layer metal figure 9. MAX2043 ev kit pc board layout?ottom soldermask figure 10. MAX2043 ev kit pc board layout?ottom silkscreen
|
