general description the max3782 evaluation kit (ev kit) is an assembled demonstration board that provides easy evaluation of the max3782 dual 1.25gbps transceiver. the max3782 ev kit requires one +3.3v supply and includes an led to indicate the lock status of max3782 plls. features fully assembled and tested +3.3v operation allows easy testing of thermal performance easy selection of operating modes evaluates: max3782 max3782 evaluation kit ________________________________________________________________ maxim integrated products 1 designation qty description j31, j32, tp1, tp2 4 test points j34?37, j45?57 0 not installed j38, j39, j40 3 3-pin headers (0.1in centers) j41?44 0 not installed r1?8 8 0 ? ?% resistors (0603) r9, r10, r11 3 10k ? ?% resistors (0603) r12?25 0 not installed r26 1 360 ? ?% resistor (0402) u1 1 max3782ugk 68-pin qfn-ep u2 1 inverter digi-key 296-1106-1, texas instruments sn74ahct04pwr none 1 max3782 ev kit circuit board, rev a none 1 max3782 ev kit data sheet none 1 max3782 data sheet component list ordering information supplier phone fax avx 803-946-0690 803-626-3123 coilcraft 847-639-6400 847-639-1469 component suppliers 19-2470; rev 0; 5/02 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. note: please indicate that you are using the max3782 when con- tacting these component suppliers part temp range ic package MAX3782EVKIT -5 c to +85 c 68 qfn-ep* designation qty description c1 c19, c22 c26, c34 c46 37 0.1f 10%, 10v (min) ceramic capacitors (0402) c20 1 33f 10%, 16v (min) tantalum capacitor c21 1 2.2f 10%, 16v (min) tantalum capacitor c27, c28 2 0.01f 10%, 10v (min) ceramic capacitors (0402) c29 0 not installed c30 c33 4 1f 10%, 10v (min) ceramic capacitors (0603) c47 1 22pf 5%, 10v (min) ceramic capacitor (0402) d1 1 red led t-1 package j1 j22, j33 23 smb connectors, pc mount digi-key j467-nd j23 j30 8 sma connectors, side mount digi-key j502-nd * exposed pad
evaluates: max3782 quick start 1) apply +3.3v to the vcc pin. connect power sup- ply ground to the gnd pin. 2) disable system loopback by shorting the vcc side of the loopen jumper. 3) apply 1.25gbps data to the rx1 and rx2 inputs. 4) apply a 125mhz reference clock to the refclk inputs. 5) apply 1.25gbps lvds data to the tdat1 and tdat2 inputs. 6) apply 625mhz input clocks to the tclk1 and tclk2 inputs. the phase drift between tclk and refclk must be <800ps after reset (refer to the max3782 data sheet). 7) briefly short the gnd side of the reset jumper. move the short to the vcc side for normal operation. 8) the lock led should light, indicating that the transmitter and receiver are in lock. 9) the data from rx1 should be present at the rdat1 output, with the recovered 625mhz clock at the rclk1 output. 10) the data applied at the tdat1 input should be present at the tx1 output. detailed description interfacing to cml inputs and outputs all cml inputs (rx1 and rx2) and outputs (tx1 and tx2) on the max3782 are ac-coupled to simplify test- ing. differential input data should be between 370mv p-p and 2000mv p-p (185mv p-p and 1000mv p-p or measured single ended). the cml outputs are ac-coupled to allow for direct connection to 50 ? oscilloscopes. interfacing to lvds inputs and outputs the lvds outputs (rdat_ and rclk_) are ac- coupled to allow direct interfacing to 50 ? oscillo- scopes. the lvds inputs (tdat_ and tclk_) are dc-coupled. for these inputs to function, provide the proper ac and dc voltages. the lvds inputs require dc biasing and therefore cannot be ac-coupled. for this reason, if the lvds outputs are to be externally looped back to the lvds inputs, the ac-coupling capacitors on the ev board (c1 c4 and c13 c16) must be replaced with 0 ? shorts. terminating unused outputs if only one side of a differential signal is being observed on a 50 ? oscilloscope, balance the circuit by similarly terminating the other output. temperature sensor the max3782 has an integrated temperature sensor to indicate the temperature of the die. independently power the temperature sensor circuit by applying 3.3v to the center pin of j39 and applying ground to the gnd pin. monitor the tempsens output voltage at tp1 to allow calibration of the temperature sensor. exposed-pad package the exposed-pad (ep), 68-pin qfn incorporates fea- tures that provide a very low thermal resistance path for heat removal from the ic. the pad is electrical ground on the max3782 and must be soldered to the circuit board for proper thermal and electrical performance. max3782 evaluation kit 2 _______________________________________________________________________________________ name type pin description vcc short for normal operation loopen (ju38) 3-pin header gnd short to enable loopback testing vcc short to connect vcc for the tempsens circuit to the rest of the vcc network vcctemp (ju39) 3-pin header gnd short to disable the tempsens circuit vcc short for normal operation reset (ju40) 3-pin header gnd momentarily short to reset fifo and receiver components d1 led lock d1 lights only when the transmitter pll and both receiver plls are in lock tp1 test point tempsens when ju3 is shorted to vcc, the voltage at tp1 is proportional to the die junction temperature tp2 test point lock tp2 can be used to monitor the voltage at the lock output table 1. controls, test points and leds
evaluates: max3782 max3782 evaluation kit _______________________________________________________________________________________ 3 max3782 r12 open r13 open r14 open r15 open j11 smb j12 smb j13 smb j14 smb bias-1-pos bias-1-neg j49 j50 j51 j52 tdat2- tdat2+ tclk2- tclk2+ vcc c1 0.1 f j15 smb rclk2+ c2 0.1 f j16 smb rclk2- c3 0.1 f j17 smb rdat2+ c4 0.1 f j18 smb rdat2- vcc vcc vcc3 u2-a c47 22pf d1 red led r26 360 ? 21 74hco4 lock r11 10k ? tp2 c19 0.1 f 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 gnd tclk2+ tclk2- tdat2+ tdat2- gnd trst-tjag vcc5 rclk2+ rclk2- rdat2+ rdat2- gnd lock vcc3 rxfil2 gnd vcc vcc j34 j35 smb j19 trst?tag smb j20 tdi?tag tms?tag trst?tag tdi?tag vcc j36 smb j21 tms?tag tck?tag vcc j37 smb j22 tck?tag vcc vcc vcc c12 0.1 f c10 0.1 f j23 smatab rx1+ c11 0.1 f j24 j25 smatab smatab rx1- r20 open r21 open r22 open j53 j54 j55 j56 rx1+ rx1- rx2+ rx2- 18 19 20 21 22 23 24 25 26 27 28 tdi-jtag tms-jtag tck-jtag gnd vcc5 rx1+ rx1- vcc5 gnd vcc5 rx2+ j33 smb tdo-tjag vcc r9 10k ? r10 10k ? c29 open vcc vcc vcc j1 smb rdat1- c13 0.1 f j3 smb rclk1- c15 0.1 f j2 smb rdat1+ c14 0.1 f j4 smb rclk1+ refclk- c16 0.1 f j9 smb c27 0.01 f r24 open refclk+ refclk+ j10 smb c28 0.01 f r25 open j57 68 67 66 65 64 63 62 61 60 59 58 gnd refclk+ refclk- vcc6 gnd rclk1+ rclk1- rdat1+ rdat1- vcc5 tdo-jtag u1 figure 1. max3782 ev kit schematic (1 of 2)
evaluates: max3782 max3782 evaluation kit 4 _______________________________________________________________________________________ vcc c9 0.1 f j26 smatab r23 open vcc j38 loopen vcc j39 vcctemp tp1 29 30 31 32 33 34 rx2- vcc5 gnd vcctemp tempsens loopen vcc tdat1- bias-1-pos bias-1-neg j5 smb tdat1+ j6 smb tclk1- j7 smb tclk1+ j8 smb tdat1- tdat1+ tclk1- tclk1+ r19 open r18 open r17 open r16 open vcc j40 57 56 55 54 53 52 reset vcc6 tclk1+ tclk1- tdat1+ tdat1- vcc1 c18 0.1 f vcc vcc vcc vcc vcc c5 0.1 f j30 smatab tx2+ c6 0.1 f j29 smatab tx2- c7 0.1 f j28 smatab tx1+ c8 0.1 f j27 smatab tx1- vcc2 c17 0.1 f 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 gnd gnd vcc4 tx2+ tx2- vcc4 gnd vcc4 tx1+ tx1- vcc4 vcc6 rxfil1 vcc2 gnd vcc1 txfil j43 bias-1-neg lvds bias- j44 bias-1-pos lvds bias+ j42 bias-2-pos cml bias+ j31 vcc j32 gnd c20 33 f c21 2.2 f c26 0.1 f r4 0 ? r8 0 ? c33 1 f c25 0.1 f vcc3 r3 0 ? r7 0 ? c32 1 f c24 0.1 f vcc2 r2 0 ? r6 0 ? c31 1 f c23 0.1 f r1 0 ? r5 0 ? c30 1 f c22 0.1 f vcc1 vcc vcc1 c44 0.1 f vcc c34 0.1 f vcc c39 0.1 f vcc c40 0.1 f vcc c41 0.1 f vcc c42 0.1 f vcc c43 0.1 f vcc c35 0.1 f vcc c36 0.1 f vcc c37 0.1 f vcc c38 0.1 f vcc2 c45 0.1 f vcc3 c46 0.1 f distributed filter caps max3782 u1 j41 bias-2-neg cml bias- j45 j46 j47 j48 figure 1. max3782 ev kit schematic (2 of 2)
evaluates: max3782 max3782 evaluation kit figure 2. max3782 ev kit component placement guide?omponent side 1.0" _______________________________________________________________________________________ 5
evaluates: max3782 max3782 evaluation kit 6 _______________________________________________________________________________________ figure 6. max3782 ev kit pc board layout?round plane 1.0" figure 3. max3782 ev kit pc board layout?omponent side figure 4. max3782 ev kit pc board layout?older side figure 5. max3782 ev kit pc board layout?ower plane 1.0" 1.0" 1.0"
evaluates: max3782 max3782 evaluation kit 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 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. figure 7. max3782 ev kit component placement guide?older side 1.0"
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