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19-1969; Rev 0; 2/01
MAX3891 Evaluation Kit
General Description
The MAX3891 evaluation kit (EV kit) is an assembled surface-mount demonstration board that provides easy evaluation of the MAX3891 2.5Gbps, 16:1 serializer with clock synthesis and single-ended, low-voltage PECL inputs. The MAX3891 EV kit is optimized for +3.3V operation. Total current consumption at 3.3V is 570mA. The EV kit provides PECL terminations and controlled 50 impedances on all input and output data lines. o +3.3V Single Supply o Selectable Reference Clock Frequencies (155.52MHz, 51.84MHz, 77.76MHz, 38.88MHz) o Fully Assembled and Tested Surface-Mount Board
Features
Evaluates: MAX3891
Ordering Information
PART MAX3891EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 64 TQFP-EP*
*Exposed pad
Component List
DESIGNATION C1-C6, C8-C11, C13-C32, C34-C37 C7 QTY 34 DESCRIPTION 0.1F 10%, 10V min ceramic capacitors (0603) 0.33F 10%, 25V min ceramic capacitor (0603) 33F 10%, 10V min tantalum capacitor Sprague 293D336X0010C2 SMA connectors (side mount) SMB connectors (PC mount) SMA connectors (PC mount) 2-pin headers (0.1in centers) 56nH inductors Coilcraft 0805CS-560XKBC 49.9 1% resistors (0402) 10k 1% resistor (0402) 27.4 1% resistors (0402) 24.3 1% resistors (0402) 221 1% resistors (0402) SUPPLIER Coilcraft Sprague DESIGNATION R7, R11, R15, R19, R20, R26, R30, R32, R33, R34, R36, R38, R42, R46, R50, R54, R58, R62, R66, R70, R74, R78, R81, R85, R91, R95 R21, R27, R31, R35, R37, R39, R40, R41, R43, R47, R51, R55, R59, R63, R67, R71, R75, R79, R83, R87 R22, R23 U1 VCC, GND None None 6 6 None QTY DESCRIPTION
1
26
130 1% resistors (0402)
C12 J1-J6 J7-J24, J27, J28 J25, J26 JU1, JU3-JU9 L1-L5 R1, R2 R3 R4, R8, R12, R16, R28, R29 R5, R9, R13, R17, R24, R25 R6, R10, R14, R18, R89, R93
1 6 20 2 8 5 2 1 6
20
82.5 1% resistors (0402)
2 1 2 8 1 1
20k 1% resistors (0402) MAX3891ECB (64-pin TQFP-EP) Test points Shunts MAX3891 EV kit circuit board MAX3891 data sheet
Component Suppliers
PHONE 847-639-6400 207-324-4140 FAX 847-639-1469 603-224-1430
Note: Please indicate you are using the MAX3891 when contacting the suppliers.
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3891 Evaluation Kit Evaluates: MAX3891
Detailed Description
The MAX3891 EV kit contains all components needed to simplify the evaluation of the MAX3891 16:1 serializer. The completely assembled and factory-tested EV kit operates from a single +3.3V supply and includes all external components necessary to interface with standard 50 test equipment. On-board termination and AC coupling is provided for the MAX3891's singleended LV PECL parallel data inputs. The differential LV PECL serial data outputs are also terminated on-board with resistive networks optimized for forward and reverse 50 termination. The evaluation kit also provides AC coupling and 50 terminations for the CML system loopback outputs. Control functions and operating parameters are programmed with jumpers. The reference clock rate is programmed with JU3-JU5, the PLL loop filter capacitor can be shorted by shorting JU6, and the system loopback outputs can be selected for diagnostic testing by setting JU1 appropriately. Care must be taken when designing power-supply filtering as the VCCVCO supply is most susceptible to power-supply noise. Noise on the VCO supply causes the VCO to generate phase noise, which could degrade the MAX3891's jitter performance. Inductive filtering is recommended for the VCO supply. Noise on the VCCO supply is effectively rejected; however, because of the external PECL biasing, significant noise is coupled back onto the VCCO supply pin. Ideally, this supply should be isolated from all the others. At the least, isolate the VCCO supply from the VCCVCO supply. The single-ended PECL inputs could be affected by noise on the VCCPECL supply. Since PECL signal swings are much larger than the expected supply noise, the PECL inputs require relatively simple filtering. Decoupling capacitors placed close to the IC should be adequate in most cases. The VCCPLL and VCCDIG supplies power the rest of the IC. These supplies have moderate supply noise rejection and contribute moderately to total supply-induced noise. In most cases, VCCPLL and VCCDIG can also be decoupled with capacitors placed close to the IC.
Layout Considerations
All differential signal outputs are of equal length and use coupled 50 transmission lines so that propagation delay skew is minimized. The on-board impedance matching resistive networks provided for the PECL outputs allow easy interface of the EV kit to standard test equipment with 50 terminations to ground. These minimum loss pads are optimized for both forward and reverse 50 impedance and attenuate the MAX3891's output signal by 0.46V/V (6dB). SMA connectors are provided for all high-speed differential outputs (SDI, SLBI, and SCLKO) and for the differential reference clock input (RCLK). SMB connectors are provided for the single-ended input data signals (PDI_) parallel input clock (PCLKI) and parallel output clock (PCLKO) Supply power is routed to the MAX3891 through five separate, independently filtered voltage supplies: VCCDIG, VCCO, VCCPLL, VCCVCO, and VCCPECL.
Jumpers and Test Points
The MAX3891 EV kit provides jumpers to allow easy configuration of the MAX3891's mode of operation. Table 1 gives a brief description of the MAX3891's jumper functions. The SOS jumper, JU1, configures the data output path. For normal operation, short pins 1 and 2 of JU1 to disable the SLBO outputs. For system loopback diagnostic testing, remove the shunt from JU1 to enable the system loopback outputs. The MAX3891 has the ability to use multiple reference clock frequencies. Use the CLKSET jumpers JU2, JU3, and JU4 to program the MAX3891's reference clock input for 38.88MHz, 51.84MHz, 77.76MHz, or 155.52MHz (Table 2). For example, remove the shunts from JU3 and JU5 and short pins 1 and 2 of JU4 for operation using a 51.84MHz reference clock.
Table 1. Jumpers, Test Points, and Connections
NAME JU1 JU3, JU4, JU5 JU6 TYPE Two-pin header Two-pin header Two-pin header DESCRIPTION Used to enable/disable the SLBO outputs. Used to program the reference clock frequency Used to short the filter (FIL ) pins NORMAL POSITION Shorted
Table 2. CLKSET Jumper Functions
fRCLK (MHz) 155.52 77.76 See Table 2 51.84 38.88 Open Open Open Open JU3 Shorted (to VCC) Open Open Shorted (20k to ground) Open JU4 JU5 Open Open Open Shorted (to ground)
2
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MAX3891 Evaluation Kit
Quick Start
The MAX3891 allows the use of multiple reference clock frequencies. Be sure to set the clockset jumpers appropriately for your reference clock frequency. The following procedure sets up the EV kit for a 155.52MHz reference clock. 1) Verify that the shunts are in place on 2-pin headers JU1 and JU3. JU1 will disable the SLBO outputs and JU3 will select the input reference clock frequency of 155.52MHz. 2) Verify that the shunts are removed from 2-pin headers JU4, JU5, and JU6. 3) Connect the differential output of your reference clock through 50 cables to the differential RCLK inputs. 4) Connect your single-ended signal source outputs through 50 cables to the parallel data (PDI_) inputs. If 16 separate 155.52MHz signal generators are not available, tie the unused parallel data inputs to either a PECL high or PECL low. To tie an input to a PECL high, remove the 130 PECL biasing resistor. To tie an input to a PECL low, reverse positions of the PECL input biasing resistors. 5) Connect the differential parallel input clock through 50 cables to the PCLKI inputs. 6) Connect the serial data and clock outputs through 50 cables to a 50 oscilloscope (minimum 3GHz bandwidth) or test equipment. 7) Power up the EV kit with a 3.3V supply and check the signal at the output.
Evaluates: MAX3891
Exposed Pad Package
The exposed pad (EP) 64-pin TQFP incorporates features that provide a very low thermal-resistance path for heat removal from the IC--either to a PC board or to an external heat sink. The MAX3891's EP must be soldered directly to a ground plane with good thermal conductance.
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MAX3891 Evaluation Kit Evaluates: MAX3891
J26 SMA VCCDIG 3R3V VCC J46 L1 56nH L2 56nH L3 56nH L4 56nH L5 56nH VCC C1 0.1F R1 49.9 VCC R2 49.9 VCC R5 24.3 J3 SMA R4 27.4 R6 221 R9 24.3 J4 SMA R8 27.4 R10 221 R13 24.3 J5 SMA R12 27.4 R14 221 R17 24.3 J6 SMA R16 27.4 C6 0.1F J7 SMB R7 130 JU1 VCC R11 130 VCCO C3 0.1F VCC R3 10k 1 2 3 4 VCCO 5 6 VCCO 7 8 9 10 11 12 VCCO 13 VCCDIG 14 15 16 VCCO C15 0.1F GND VCCVCO C11 0.1F C5 0.1F
J25 SMA
J28 SMB
VCCDIG VCC0 VCCPLL VCCVCO VCCPECL VCCPLL C10 0.1F R22 20k
JU3 JU4
C4 R36 0.1F 130
R20 130
R29 27.4
R93 221 R25 24.3
C12 33F GND J47
C13 0.1F
JU5 JU6 C8 0.1F C7 0.33F VCCPLL
VCC R37 82.5
VCC
R21 82.5
VCC
R95 130
C9 0.1F
VCCPECL VCCPECL VCCDIG
64 63 62 61 60 59 58 57
VCC GND FIL+ FILVCC CLKSET RCLKRCLK+
J2 SMA
C2 0.1F
VCC 56 PCLKO55 PCLKO+ 54 VCC 53 PDI0 52 VCC 51 PDI1 50 GND 49
J1 SMA
GNDTEST VCCDIG R23 JU7 20k JU8 GND VCC PDI2 VCC PDI3 VCC PDI4 VCC PDI5 VCC PDI6 VCC PDI7 VCC PDI8 GND 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 JU9 VCCPECL C37
GND VCC SLBOSLBO+ VCC
0.1F
VCC R15 130 VCC R19 130
SOS VCC SCLKOSCLKO+ VCC SDOSDO+ VCC VCC PLKI+ PLKI-
U1 MAX3891
VCCPECL C36
0.1F
GND PDI15 VCC PDI14 VCC PDI13 VCC PDI12 25 V CC 26 PDI11 27 V CC 28 PDI10 29 V
30 PDI9 31 VCC 32 VCC
CC
VCCDIG
R18 VCC 221 R40 82.5 R32 130 VCC R41 82.5
17 18 19 20 21 22 23 24
C14 0.1F
C35 0.1F
VCCPECL
VCCPECL
C34 0.1F
R27 VCC 82.5 R26 130 C16 0.1F
R31 VCC 82.5 R30 130 C17 0.1F
R35 VCC 82.5 R34 130 C18 0.1F
R39 VCC 82.5 R38 130 C19 0.1F
R43 VCC R47 VCC R51 VCC 82.5 82.5 82.5 R42 130 C20 0.1F R46 130 C21 0.1F R50 130 C22 0.1F
J8 SMB
C32 0.1F
R33 130
J9 SMB
J10 SMB
J11 SMB
J12 SMB
J13 SMB
J14 SMB
J15 SMB
Figure1. MAX3891 EV Kit Schematic 4 _______________________________________________________________________________________
MAX3891 Evaluation Kit Evaluates: MAX3891
J27 SMB
J24 SMB
J23 SMB
R28 27.4
C31 0.1F R89 221
R85 130
C30 0.1F
R81 130
R24 24.3 VCC R91 130
VCC R87 82.5
VCC
R83 82.5
VCC R79 82.5 VCC R78 130 C28 0.1F J21 SMB C27 0.1F J20 SMB C26 0.1F J19 SMB C29 0.1F J22 SMB
R75 82.5 VCC R74 130
R71 82.5 VCC R70 130
R67 82.5 VCC R66 130
R63 82.5 R62 130
C25 0.1F J18 SMB
VCC
R59 82.5 VCC R58 130
C24 0.1F J17 SMB
R55 82.5 R54 130
C23 0.1F J16 SMB
Figure1. MAX3891 EV Kit Schematic (continued) _______________________________________________________________________________________ 5
MAX3891 Evaluation Kit Evaluates: MAX3891
1.0"
Figure 2. MAX3891 EV Kit Component Placement Guide
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MAX3891 Evaluation Kit Evaluates: MAX3891
1.0"
Figure 3. MAX3891 EV Kit PC Board Layout --Component Side
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MAX3891 Evaluation Kit Evaluates: MAX3891
1.0"
Figure 4. MAX3891 EV Kit PC Board Layout--Ground Plane
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MAX3891 Evaluation Kit Evaluates: MAX3891
1.0"
Figure 5. MAX3891 EV Kit PC Board Layout--Power Plane
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit 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 _____________________ 9 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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