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19-1427; Rev 0; 1/99
MAX3690 Evaluation Kit
General Description
The MAX3690 evaluation kit (EV kit) is an assembled surface-mount demonstration board that provides easy evaluation of the MAX3690 622Mbps serializer with TTL input, clock synthesis, and differential PECL output.
____________________________Features
o +3.3V Single Supply o 77.76MHz Overhead Generation Clock Reference Frequency o Selectable Input Clock Reference Frequencies 77.76MHz 51.84MHz 38.88MHz o Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX3690
Component List
DESIGNATION QTY C4-C12, C16-C21 C13, C22 C14 C15* C2, C3, R2, R11, JU1, JU2, JU4 L1-L5* R3, R4 R5, R6 R7, R8 R9, R10 R12 PCLKI, PD0-PD7, PCLKO RCLK, SD+, SD15 2 1 1 0 5 2 2 2 2 1 10 DESCRIPTION 0.1F, 25V min, 10% ceramic capacitors (0603) 1F, 10V min, 10% ceramic capacitors (0805) X7R 1F, 25V min, 10% ceramic capacitor (0805) 33F 10%, 10V min tantalum cap AVX TAJD336K010 Do not install 56nH inductors Coilcraft 0805CS-560XKBC 27, 5% resistors (0603) 220, 5% resistors (0603) 130, 5% resistors (0603) 24, 5% resistors (0603) 20k, 5% resistor (0603) SMB connectors (PC mount) Suhner 82 SMB-50-0-1/111 SMA connectors (PC mount) E.F. Johnson 142-0701-206 or Digi-Key J495-ND Test points Mouser 151-203 2x2 pin header (0.1" centers) Digi-Key S2012-36-ND Shunt Digi-Key S9000-ND MAX3690ECJ (32 TQFP) MAX3690 EV kit circuit board, Rev. B MAX3690 data sheet*
Ordering Information
PART MAX3690EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 32 TQFP
Component Suppliers
SUPPLIER Coilcraft Sprague PHONE 847-639-6400 603-224-1961 FAX 847-639-1469 603-224-1430
Note: Please indicate that you are using the MAX3690 when contacting these component suppliers.
Detailed Description
The MAX3690 EV kit simplifies evaluation of the MAX3690ECJ. The EV kit operates from a single +3.3V supply and includes all the external components necessary to interface with TTL inputs and 3.3V PECL outputs.
PD_, PCLKI
These TTL inputs are high impedance, with a range of 0 to VCC (+3.3V) with respect to ground. All input signal lines are of equal length to minimize propagation-delay skew.
3
RCLK
See Table 1 for changing reference clock rates. In normal operation with a high-impedance TTL reference source, RCLK should be driven like PCLKI with R2 open and C2 shorted. If RCLK is driven by a 50 TTL source, R2 should be 50, JU1 should be shorted, and C2 should be shorted. If a non-TTL source is used for RCLK, C2 = 0.1F (ensure trace under C2 is cut) and V CC / 2 should be applied to the stub on the nonground side of JU1. Important: Note that the output of the reference clock generator must swing at least 1.2V peak to peak.
VCC, GND JU3 None U1* None None
2 1 1 1 1 1
* Supplied by Maxim.
PCLKO
PCLKO is designed to drive a high-impedance TTL input. To drive other I/O standards, a converter on this output is recommended. The PCLKO output is sensitive to capacitance loading (see MAX3690 data sheet for specified capacitance loading).
1
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX3690 Evaluation Kit Evaluates: MAX3690
SD+, SDThe PECL outputs have an attenuation and impedance matching network on the EV board that allows 50 terminations to ground for oscilloscope interfacing. All signal inputs and outputs use coupled 50 transmission lines. All output signal lines are of equal length.
Table 1. Jumper JU3 Functions
SHUNT LOCATION 1-2* 3-4* Open REFERENCE CLOCK FREQUENCY 51.84 38.88 77.76 CKSET PIN Connected to a 20k termination to GND Connected to GND Floating
* Pins 1 and 2 are the top two pins.
JU2 C12 0.1F C22 1F VCCPLL JU4 VCCPLL C13 1F 24 GND 23 FIL22 FIL+ 21 VCC 20 CKSET 19 GND 18 GND 17 GND C10 0.1F C7 0.1F VCC SD+ SD16 15 14 13 12 11 10 9 C6 0.1F VCCECL VCCLVDS +3.3V J15 PCLKO R10 R8 24 130 C9 0.1F C21 0.1F +3.3V R9 24 R3 27 VCCVCO C11 0.1F JU3 R12 20k R11 OPEN +3.3V
J13 SD+
R7 130
R6 220
JU1 C3 0.1F J2 RCLK C2 SHORT VCCPLL VCCDIG J3 PCLKI C5 0.1F R2 OPEN
25 26 C4 0.1F 27 28 29 30 31 32
GND GND RCLK
C8 0.1F R4 27 J14 SDR6 220
U1
VCC VCC
MAX3690
VCC PCLKI GND GND PD0 PD1 PD2 PD3 PD4 PD5 PD6 PD7 VCC PCLKO PCLKO GND
J5 PD0 J6 PD1 JU11 L1 56nH C16 0.1F JU12 L2 56nH C17 0.1F J17 +3.3V C15 33F J18 GND JU15 L5 C14 1F JU14 L4 JU13 L3 56nH C18 0.1F 56nH C19 0.1F 56nH C20 0.1F
1
2
3
4
5
6
7
8
J11 PD7
VCCVCO
J12 PD6
VCCPLL J7 PD2 VCCDIG J8 PD3 VCCECL J10 PD4 J9 PD5
VCCLVDS
Figure 1. MAX3690 EV Kit Schematic
2 _______________________________________________________________________________________
MAX3690 Evaluation Kit Evaluates: MAX3690
1.0"
1.0"
Figure 2. MAX3690 EV Kit PC Board Layout--Component Side
Figure 3. MAX3690 EV Kit PC Board Layout--Solder Side
1.0" 1.0"
1.0" 1.0"
Figure 4. MAX3690 EV Kit PC Board Layout--Power Plane
Figure 5. MAX3690 EV Kit PC Board Layout--Ground Plane
3
_______________________________________________________________________________________
MAX3690 Evaluation Kit Evaluates: MAX3690
1.0"
Figure 6. MAX3690 EV Kit PC Board Layout--Silk Screen
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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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