19-2144; Rev 0; 8/01 MAX3822 Evaluation Kit Features ♦ Fully Assembled and Tested ♦ Easy Loss-of-Power (LOP) Threshold Programming ♦ LOP Indicators ♦ Channel-Select Configuration Pins Ordering Information Component List DESIGNATION QTY DESCRIPTION 19 0.1µF ±10% 10V ceramic capacitors C17–C20 4 0.033µF ±10% 10V ceramic capacitors C26 1 33µF tantalum capacitor C27 1 2.2µF ±10% 10V ceramic capacitor C1–C16, 21, 25, 28 J1–J8, J10–J17 16 SMA connectors (edge mount) EFJohnson 142-0701-801 J9, J18–J22 6 3-pin headers (0.1in centers) J23, J24 2 Shunts J23, J24 2 2-pin headers (0.1in centers) L1, L2 2 56nH SMD inductors LED1–LED5 5 Red T1 packages R1–R5 5 150Ω ±1% resistors R6 1 100Ω ±1% resistor R7 1 1kΩ potentiometer PART MAX3822EVKIT TEMP. RANGE 0°C to +85°C IC PACKAGE 48 TQFP *Exposed pad Component Suppliers SUPPLIER PHONE FAX Coilcraft 847-639-6400 847-639-1469 Sprague 207-324-4140 603-224-1430 Note: Please indicate that you are using the MAX3822 EV kit when contacting these component suppliers. Quick Start 1) Set the channel-select (CS) pin to enable channel 1 by removing the shunt from J9. 2) Set the threshold level to mid-range by adjusting threshold control potentiometers R7 and R8 for 650Ω measured between VTH and ground. R8 1 200Ω potentiometer U1 1 MAX3822ECM 48-pin TQFP 3) Enable the LOP and LOP1 indicators by placing shunts across the LED side of J22 and J18. VCC, GND 2 Test points 4) Ensure shunts on J23 and J24 are in place. None 1 MAX3822 evaluation circuit board, Rev C 5) Connect ground and a +3.3V supply to the proper terminals on the EV kit. None 1 MAX3822 data sheet None 1 MAX3822 EV kit data sheet 6) Connect the inputs of channel 1 to a 50Ω source using 50Ω SMA cables. Set the source to produce a differential 50mVp-p 2.5Gbps signal. 7) Connect the outputs of channel 1 to a 50Ω oscilloscope with 50Ω SMA cables. 8) Power up the EV kit. 9) Check that the amplified and limited input pattern is present on the output. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX3822 General Description The MAX3822 evaluation kit (EV kit) is a fully assembled demonstration board that simplifies evaluation of the MAX3822 quad limiting amplifier. The EV kit is shipped from the factory with all components needed to interface with standard 50Ω test equipment. The kit features on-board power-supply filtering and consumes approximately 240mA with a +3.3V supply. To facilitate evaluation of the MAX3822 at speed, the EV kit is laid out with 50Ω controlled impedance on all signal lines. Evaluates: MAX3822 MAX3822 Evaluation Kit Detailed Description The MAX3822 EV kit contains all components necessary to evaluate the MAX3822 quad-limiting amplifier. The completely assembled and factory-tested EV kit features on-board power-supply filtering and operates from a single +3.3V supply. In quad-channel operation, the MAX3822 EV kit consumes approximately 240mA (current consumption drops to approximately 70mA for single-channel operation). The MAX3822 EV kit is shipped from the factory configured for interfacing with standard 50Ω test equipment. Side-mount SMA connectors are used for the MAX3822’s signal I/O ports. To simplify interfacing to 50Ω test equipment, the EV kit provides AC-coupling for the MAX3822’s CML inputs and outputs. All differential input and output data paths are 50Ω controlledimpedance transmission lines. The MAX3822 EV kit facilitates programming of the input signal level threshold with two potentiometers. Use R7 for coarse tuning and R8 for fine tuning. Test points and LEDs are provided for monitoring the MAX3822’s LOP output. The LOP outputs are connected to the two pins on the OUT side of J18–J22. Program the MAX3822’s operational mode with J9. Single-, dual-, and quad-channel operation is accom- plished by shunting (or removing the shunt from) the appropriate pins of J9. For single-channel operation, remove the shunt from J9 to enable channel 1. For dual-channel operation, shunt pins 1 and 2 on J9 to enable channels 1 and 2. For quad-channel operation, shunt pins 2 and 3 on J9 to enable all four channels. When in single- or dual-channel operation, the unused amplifiers are shut down and overall current consumption is reduced. If desired, current consumption can be further reduced by disabling the LOP diodes’ drive current. Current is delivered to the LEDs through J18–J22. For example, to conserve current while in dual-channel operation, disable LEDs for channels 1 and 2 by removing the shunts from J18 and J19. Connections, Adjustments, and Controls Layout Considerations The MAX3822 quad limiting amplifier is a high-gain, high-frequency device whose performance can be affected by poor board layout. The MAX3822 EV kit is fabricated on a four-layer board with controlled impedance transmission lines and separate power and ground planes. Supply noise filtering is done with inductive filtering and decoupling capacitors placed close to the IC’s VCC pins. Table 1. Jumpers, Test Points, and Indicators 2 NAME TYPE FUNCTION J9 3-pin header Channel-Select Input. Leave all pins open to enable channel 1. Short pins 1 and 2 to activate channels 1 and 2. Short pins 2 and 3 to enable all four channels. J18 3-pin header Connects LOP LED Indicator to the LOP Output of Channel 1. Shunting pins on the LED side causes the LOP output to be connected to the LED and removing the shunt opens the LOP LED. J19 3-pin header Connects LOP LED Indicator to the LOP Output of Channel 2. Shunting pins on the LED side causes the LOP output to be connected to the LED and removing the shunt opens the LOP LED. J20 3-pin header Connects LOP LED Indicator to the LOP Output of Channel 3. Shunting pins on the LED side causes the LOP output to be connected to the LED and removing the shunt opens the LOP LED. _______________________________________________________________________________________ MAX3822 Evaluation Kit Evaluates: MAX3822 Table 1. Jumpers, Test Points, and Indicators (continued) NAME TYPE FUNCTION J21 3-pin header Connects LOP LED Indicator to the LOP Output of Channel 4. Shunting pins on the LED side causes the LOP output to be connected to the LED and removing the shunt opens the LOP LED. J22 3-pin header Connects the General LOP LED Indicator to the General LOP Output of Quad Limiting Amplifier. Shunting on the LED side causes the LOP output to be connected to the LED and removing the shunt opens the LOP LED. J23 2-pin header Jumper from Power Supply to the Device VCC J24 2-pin header Jumper from Power Supply to the LEDs LED1 LED LOP Indicator for Channel 1. Lights when limiting amplifier 1 is in the LOP state. LED2 LED LOP Indicator for Channel 2. Lights when limiting amplifier 2 is in the LOP state. LED3 LED LOP Indicator for Channel 3. Lights when limiting amplifier 3 is in the LOP state. LOP Indicator for Channel 4. Lights when limiting amplifier 4 is in the LOP state. LED4 LED LOP LED5 LED VCC Test point General LOP Indicator. Lights when any of the four limiting amplifiers is in the LOP state. Power-Supply Connection GND Test point R7 Potentiometer Coarse Power-Detection Threshold Adjustment Ground Connection R8 Potentiometer Fine Power-Detection Threshold Adjustment _______________________________________________________________________________________ 3 Evaluates: MAX3822 MAX3822 Evaluation Kit 3 C17 0.033µF R8 200Ω 1 J9 2 P7 J5 C5 0.1µF P8 P9 P10 C6 0.1µF P11 J6 J7 C7 0.1µF J8 C8 0.1µF P12 VCC IN2+ IN2- VTH GND OUT2+ OUT2- U1 VCC VCC IN3+ IN3- VCC VCC OUT3+ OUT3- MAX3822 VCC VCC IN4+ IN4- OUT4+ OUT4- C19 0.033µF C20 0.033µF J23 L2 56nH J24 C9 0.1µF J10 C10 0.1µF J11 P34 P33 C11 0.1µF J12 P32 P31 C12 0.1µF P30 P29 P28 P27 P26 J13 C13 0.1µF J14 P25 C14 0.1µF J15 C15 0.1µF J16 C16 0.1µF J21 R4 150Ω J17 LED4 J20 R3 150Ω LED3 J19 R2 150Ω LED2 J18 R1 150Ω LED1 J22 R5 150Ω LED5 Figure1. MAX3822 EV Kit Schematic 4 C26 33µF L1 56nH P40 P39 P38 P37 OUT1VCC LOP3 LOP4 P6 GND GND P42 P41 P48 P47 P46 P45 P44 P43 P5 OUT1+ P36 P35 P24 C4 0.1µF P3 P4 C27 2.2µF R7 1kΩ IN1+ IN1- LOP1 LOP2 J4 C3 0.1µF P1 P2 P22 P23 J3 GND CZ1+ CZ1GND CZ2+ CZ2GND CS C2 0.1µF GND CZ4CZ4+ GND CZ3CZ3+ GND LOP J2 P13 P14 P15 P16 P17 P18 P19 P20 P21 C1 0.1µF C25 C21 C28 0.1µF 0.1µF 0.1µF 3 C18 0.033µF 1 J1 GND R6 100Ω 2 _______________________________________________________________________________________ VCC MAX3822 Evaluation Kit Evaluates: MAX3822 1.0" 1.0" Figure 2. MAX3822 EV Kit Component Placement Guide— Component Side 1.0" Figure 3. MAX3822 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX3822 EV Kit PC Board Layout—Ground Plane Figure 5. MAX3822 EV Kit PC Board Layout—Power Plane _______________________________________________________________________________________ 5 Evaluates: MAX3822 MAX3822 Evaluation Kit 1.0" Figure 6. MAX3822 EV Kit PC Board Layout—Solder Side 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 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.