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| 19-1664; Rev 0; 4/00 MAX3770 Evaluation Kit General Description The MAX3770 evaluation kit (EV kit) simplifies evaluation of the MAX3770/MAX3771 Fibre Channel data repeater ICs. This fully assembled and factory-tested kit enables testing of all the devices' functions. 50 SMA connectors and controlled impedance transmission lines are provided for the differential data inputs and outputs, as well as the voltage-controlled oscillator (VCO) clock outputs. A test/calibration path enables the user to calibrate test equipment so accurate measurements can be taken. On-board 75 to 50 impedance transformation networks simplify interfacing with standard 50 test equipment. Jumpers allow the user to enable or disable the data repeater IC frequency lock indicator and the VCO's clock outputs. The VCO frequency lock can be monitored visually with the provided LED and through the LOCK test point. o Fully Assembled and Tested o Frequency Lock Indicator o On-Board 75 to 50 Impedance Conversion Networks for Interfacing with Standard Test Equipment o Test Signal Path for Board Characterization and Jitter Calibration o Jumpers for Controlling the Clock Output and Frequency Lock Indicator Features Evaluates: MAX3770/MAX3771 Ordering Information PART MAX3770EVKIT TEMP. RANGE 0C to +70C IC PACKAGE 16 QSOP Component List DESIGNATION QTY C1-C6, C8, C9, C12-C15 C7 C10 C11 J1-J6, J10-J13 J8, J9 None L1 LED1 LOCK, VCC, GND R1, R2, R4, R5, R7, R8, R11, R12, R14, R15 R3, R6, R9, R13, R16 R10 U1 None None 12 1 1 1 10 2 2 1 1 3 DESCRIPTION 0.1F 10%, 25V (min) ceramic caps 0.22F 10%, 25V (min) ceramic cap 2.2F 10%, 25V (min) ceramic cap 33F 10%, 16V (min) tantalum cap SMA connectors (edge mount) 3-pin headers (0.1in centers) Shunts for J8, J9 56nH inductor Coilcraft 0805HT-56NTKBC Red LED T-1 package 1-pin headers (0.1in centers) Note: To evaluate the MAX3771, order the MAX3770 EV kit and obtain samples of the MAX3771. Component Suppliers SUPPLIER Coilcraft PHONE 847-639-6400 FAX 847-639-1469 Note: Please indicate that you are using the MAX3770 EV kit when contacting this component supplier. Detailed Description Quick Start 1) Connect a differential signal source to the input at IN+ and IN-. Set the differential signal amplitude to 500mV peak to peak (p-p). Set the input signal data rate to 2.125Gbps for the MAX3770 or 1.062Gbps for the MAX3771. 2) If the clock output is desired, connect a shunt across pins 2 and 3 of J9 (CLKEN) to enable the clock output. Shunt pins 1 and 2 of J9 if no clock output is desired (Tables 1 and 2). 3) Enable the frequency lock indicator by shunting pins 2 and 3 of J8 (LOCKEN). Shunt pins 1 and 2 if no lock indication is desired. 4) Connect the data and clock outputs (OUT+, OUT-, CLK+, and CLK-) through 50 matched-impedance cables to a 50 oscilloscope with a minimum bandwidth of 3GHz. 10 43.2 1% resistors 5 1 1 1 1 178 1% resistors 150 1% resistor MAX3770CEE or MAX3771CEE 16-pin QSOP MAX3770/MAX3771 circuit board MAX3770/MAX3771 data sheet ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX3770 Evaluation Kit Evaluates: MAX3770/MAX3771 Table 1. Adjustments and Control Descriptions* COMPONENT J8 NAME LOCKEN FUNCTION Enables/disables the frequency lock indicator. Shunt between pins 1 and 2 to disable the frequency lock indicator; shunt between pins 2 and 3 to enable the frequency lock indicator. Enables/disables the PLL's clock output. Shunt between pins 1 and 2 to disable the clock output; shunt between pins 2 and 3 to enable the clock output. Provides a visual indication when the PLL is not frequency locked. LED is illuminated when the PLL is not frequency locked. Frequency lock indicator test point. A TTL high indicates the PLL is frequency locked; a TTL low indicates the PLL has lost lock. J9 LED1 J7 CLKEN LOCK LOCK *See Quick Start first. 5) Power up the EV kit with a +3.3V supply. On the scope, the differential amplitude of the signal should be between 300mVp-p and 600mVp-p. Table 2. Control Functions LOCKEN (J8) 0 0 1 1 CLKEN (J9) 0 1 0 1 LOCK Disabled Disabled Enabled Enabled CLOCK Disabled Enabled Disabled Enabled Control Functions The MAX3770 EV kit is equipped with two 3-pin headers that allow the user to enable or disable the outputs of the VCO clock and frequency lock indicator. Header pin 1 is connected to ground, pin 2 is connected to the device's control pin, and pin 3 is connected to VCC. Table 2 gives the output states obtained when the control pins are forced high or low. Program a 0 by shunting pins 1 and 2; program a 1 by shunting pins 2 and 3. Test/Calibration Circuit The test/calibration signal path contains the same type of SMA connectors, transmission line layout, and impedance-transformation networks provided for the data repeater IC's signal I/Os. The test/calibration circuit can be used for PC board characterization and jitter calibration. Input and Output Impedance Conversion The MAX3770/MAX3771 are designed to operate in 75 environments--the default for most Fibre Channel applications. For convenient interface with standard test equipment, the MAX3770 EV kit is equipped with impedance-transformation resistor networks on its inputs (50 to 75) and outputs (75 to 50). The impedancetransformation networks also introduce signal attenuation. The input signal is attenuated by a factor of 0.64, and the output signal is attenuated by a factor of 0.43. For example, a 600mV differential signal applied to the input terminals of the MAX3770 EV kit will produce a 381mV differential input signal across the IC's input pins. If a 335mV differential signal is observed at the output terminals of the MAX3770 EV kit, the IC's actual output is a 780mV differential signal. Layout Considerations MAX3770/MAX3771 performance can be greatly affected by circuit board layout and design. Use good highfrequency design techniques, including minimizing ground inductances and using fixed-impedance transmission lines on the data and clock signals. 2 _______________________________________________________________________________________ MAX3770 Evaluation Kit Evaluates: MAX3770/MAX3771 LOCK R10 150 J7 LOCK C7 0.22F 1 C1 0.1F J1 IN2 C2 0.1F J2 IN2 R1 43.2 3 4 R3 178 R2 43.2 5 6 7 8 FIL+ FILGND IN+ INGND VCC VCC LOCK 16 15 14 13 12 11 10 9 R4 43.2 C3 0.1F J3 CLK+ R6 178 C4 0.1F J4 CLK- U1 MAX3770 MAX3771 CLK+ CLKCLKEN GND OUT+ OUTLOCKEN R5 43.2 R7 43.2 C5 0.1F J5 OUT+ R9 178 C6 0.1F J6 OUT- R8 43.2 J8 J9 CLKEN LOCKEN L1 56nH VCC C11 33F GND C12 0.1F J10 TEST2+ R13 C13 178 0.1F J11 TEST2C14 0.1F C10 2.2F C9 0.1F C8 0.1F R11 43.2 R14 43.2 J12 TEST1+ R16 178 C15 0.1F J13 TEST1- R12 43.2 R15 43.2 Figure 1. MAX3770 EV Kit Schematic _______________________________________________________________________________________ 3 MAX3770 Evaluation Kit Evaluates: MAX3770/MAX3771 1.0" 1.0" 1.0" Figure 2. MAX3770 EV Kit Component Placement Guide-- Component Side Figure 3. MAX3770 EV Kit PC Board Layout--Component Side 4 _______________________________________________________________________________________ MAX3770 Evaluation Kit Evaluates: MAX3770/MAX3771 1.0" 1.0" Figure 4. MAX3770 EV Kit PC Board Layout--Solder Side Figure 5. MAX3770 EV Kit PC Board Layout--Ground Plane _______________________________________________________________________________________ 5 MAX3770 Evaluation Kit Evaluates: MAX3770/MAX3771 1.0" Figure 6. MAX3770 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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