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19-1554; Rev 1; 10/01
MAX3890 Evaluation Kit
General Description
The MAX3890 evaluation kit (EV kit) is an assembled surface-mount demonstration board that provides easy evaluation of the MAX3890 2.5Gbps 16:1 serializer with clock synthesis and low-voltage differential signal (LVDS) inputs. o +3.3V Single Supply o Selectable Reference Clock Frequencies (155.52MHz, 77.76MHz, 51.84MHz, 38.88MHz) o Fully Assembled and Tested Surface-Mount Board
Features
Evaluates: MAX3890
Component List
DESIGNATION QTY DESCRIPTION 0.1F 10%, 25V min ceramic capacitors 0.33F 10%, 16V min, X7R type ceramic capacitor Not installed 33F capacitor Sprague 593D336X9020D SMA connectors (edge mount) SMB connectors (PC mount) SMA connectors (PC mount) Test points 2-pin headers 56nH inductors Coilcraft 0805CS-560XKBC 10k 5% resistor 27 5% resistors 24 5% resistors 220 5% resistors 130 5% resistors 4.99k 1% resistors 20k 5% resistor MAX3890 (64-pin TQFP-EP) MAX3890 PC board MAX3890 data sheet Shunts for JU1-JU3 C1-C6, C10, C11, 11 C13, C14, C15 C7 C8, C9, R1, R2, R23, JU6-JU9 C12 J1-J6 J7-J22, J24-J43 J44, J45 J46, J47 JU1-JU5 L1-L4 R3 R4, R8, R12, R16 R5, R9, R13, R17 R6, R10, R14, R18 R7, R11, R15, R19 R20, R21 R22 U1 None None None 1 0 1 6 36 2 2 5 4 1 4 4 4 4 2 1 1 1 1 3
Ordering Information
PART MAX3890EVKIT *Exposed Pad TEMP RANGE -40C to +85C IC PACKAGE 64 TQFP-EP*
Component Suppliers
SUPPLIER Coilcraft Sprague PHONE 847-639-6400 207-324-4140 FAX 847-639-1469 603-224-1430
Note: Please indicate that you are using the MAX3890 when contacting these suppliers.
Detailed Description
The MAX3890 EV kit simplifies evaluation of the MAX3890. The EV kit operates from a +3.3V single supply and includes all the external components necessary to interface with LVDS inputs and 3.3V positivereferenced emitter-coupled logic (PECL) outputs. The LVDS inputs (PDI_+, PDI_-, PCLKI+, PCLKI-, RCLK+, RCLK-)** are internally terminated with 100 differential input resistance and therefore do not require external termination. Ensure that LVDS devices driving these inputs are not redundantly terminated. The LVDS outputs (PCLKO+, PCLKO-) require a differential termination with a 100 resistor between complementary outputs. Do not terminate these outputs to ground.
Layout Considerations
The PECL outputs have voltage attenuation (0.46) and impedance matching networks on the EV board that allow 50 terminations to ground for oscilloscope interfacing. All signal inputs and outputs use coupled 50 transmission lines. All input signal lines are of equal length to minimize propagation-delay skew. Likewise, all output signal lines are of equal length.
**Note: PCLKO, PCLKI, RCLK, and SCLK are labeled as PCKO, PCKI, RCK, and SCK on PC board.
________________________________________________________________ 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.
Evaluates: MAX3890
VCCDIG
L1 56nH
VCCPLL
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
VCC GND FIL+ FILVCC CKLSET RCLKRCLK+ VCC PCLKOPCLKO+ PDIOPDIO+ PDI1PDI1+ GND
MAX3890 Evaluation Kit
GND PDI15+ PDI15PDI14+ PDI14PDI13+ PDI13PDI12+ PDI12PDI11+ PDI11PDI10+ PDI10PDI9+ PDI9VCC
R14 220 R17 24 R19 130
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Figure 1. MAX3890 EV Kit Schematic
VCCDIG
JU3 JU4 C5 0.1F C4 0.1F J45 RCKJ42 PCKO+ J41 PDI0J40 PDI0+ J39 PDI1J38 PDI1+ J44 RCK+ J43 PCKOC13 0.1F L3 56nH L2 56nH
VCCDIG
2
VCC0 VCCPLL VCCPLL
JU5 L4 56nH
3.3V
J46
3.3V
C12 33F
R22 20k
J47 3.3V JU2 C7 0.33F GND J36 PDI2+ C6 0.1F C15 0.1F R1 OPEN JU6 J37 PDI2-
VCCVCO C10 0.1F C9 OPEN C8 OPEN
R21 4.99k
R20 4.99k
GND
C1 0.1F
J1 SLB0-
VCCVC0
3.3V
VCCDIG GNDTEST JU7 JU8 JU9 R23 OPEN
C2 0.1F R2 OPEN 3.3V 3.3V
C11 0.1F
J35 PDI3-
J2 SLB0+
VCCO GND
J34 PDI3+
J3 SCK0R6 220 3.3V R11 130 VCC0 C3 0.1F
R4 27 JU1
R5 24
R7 130
R3 10k
J33 PDI4-
U1 MAX3890
J32 PDI4+
R8 27 3.3V
R9 24
J4 SCK0+ R10 220 R13 24 3.3V R15 130
J5 SD0-
R12 27
1 2 3 4 VCCO 5 6 VCCO 7 8 9 10 11 12 VCCO 13 VCCDIG 14 15 16 VCC SLBOSLBO+ VCC SOS VCC SCLKOSCLKO+ VCC SDOSDO+ VCC VCC PCLKI+ PCLKIVCCDIG C14 0.1F GND PDI2PDI2+ PDI3PDI3+ PDI4PDI4+ PDI5PDI5+ PDI6PDI6+ PDI7PDI7+ PDI8PDI8+ GND 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
J31 PDI5-
J30 PDI5+
J29 PDI6-
R16 27
J6 SD0+ R18 220
J28 PDI6+
J7 PCKI+
J27 PDI7-
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J26 PDI7+ PDI15+ PDI15- PDI14+ PDI14PDI13+ PDI13PDI12+ PDI12PDI11+ PDI11PDI10+ PDI10PDI9+ PDI9J25 PDI8J9 J10 J11 J12 J13 J14 J15 J16 J17 J18 J19 J20 J21 J22 J24 PDI8+
J8 PCKI-
MAX3890 Evaluation Kit
Jumpers
JU1 should be shorted for normal operation and removed to enable SLBO+ and SLBO- for system loopback testing. The MAX3890 EV kit allows the use of multiple reference clock frequencies with the appropriate setting on JU3, JU4, or JU5. See Table 1 for these jumper settings.
Evaluates: MAX3890
Table 1. CLKSET Jumper Functions
fRCLK (MHz) 155.52 77.76 51.84 38.88 JU3 Shorted (to VCC) Open Open Open JU4 Open Open Shorted (20k to ground) Open JU5 Open Open Open Shorted (to ground)
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 heatsink. The MAX3890's EP must be soldered directly to a ground plane with good thermal conductance.
1.0"
Figure 2. MAX3890 EV Kit Component Placement Guide _______________________________________________________________________________________ 3
MAX3890 Evaluation Kit Evaluates: MAX3890
1.0"
Figure 3. MAX3890 EV Kit PC Board Layout--Component Side
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MAX3890 Evaluation Kit Evaluates: MAX3890
1.0"
Figure 4. MAX3890 EV Kit PC Board Layout--Solder Side
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MAX3890 Evaluation Kit Evaluates: MAX3890
1.0"
Figure 5. MAX3890 EV Kit PC Board Layout--Power Plane
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MAX3890 Evaluation Kit Evaluates: MAX3890
1.0"
Figure 6. MAX3890 EV Kit PC Board Layout--Ground 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 ______________________7 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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