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19-2144; Rev 0; 8/01
MAX3822 Evaluation Kit
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 50 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 50 controlled impedance on all signal lines. o Fully Assembled and Tested o Easy Loss-of-Power (LOP) Threshold Programming o LOP Indicators o Channel-Select Configuration Pins
Features
Evaluates: MAX3822
Component List
DESIGNATION C1-C16, 21, 25, 28 C17-C20 C26 C27 J1-J8, J10-J17 J9, J18-J22 J23, J24 J23, J24 L1, L2 LED1-LED5 R1-R5 R6 R7 R8 U1 VCC, GND None None None QTY 19 4 1 1 16 6 2 2 2 5 5 1 1 1 1 2 1 1 1 DESCRIPTION 0.1F 10% 10V ceramic capacitors 0.033F 10% 10V ceramic capacitors 33F tantalum capacitor 2.2F 10% 10V ceramic capacitor SMA connectors (edge mount) EFJohnson 142-0701-801 3-pin headers (0.1in centers) Shunts 2-pin headers (0.1in centers) 56nH SMD inductors Red T1 packages 150 1% resistors 100 1% resistor 1k potentiometer 200 potentiometer MAX3822ECM 48-pin TQFP Test points MAX3822 evaluation circuit board, Rev C MAX3822 data sheet MAX3822 EV kit data sheet SUPPLIER Coilcraft Sprague PART MAX3822EVKIT
Ordering Information
TEMP. RANGE 0C to +85C IC PACKAGE 48 TQFP
*Exposed pad
Component Suppliers
PHONE 847-639-6400 207-324-4140 FAX 847-639-1469 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 650 measured between VTH and ground. 3) Enable the LOP and LOP1 indicators by placing shunts across the LED side of J22 and J18. 4) Ensure shunts on J23 and J24 are in place. 5) Connect ground and a +3.3V supply to the proper terminals on the EV kit. 6) Connect the inputs of channel 1 to a 50 source using 50 SMA cables. Set the source to produce a differential 50mVp-p 2.5Gbps signal. 7) Connect the outputs of channel 1 to a 50 oscilloscope with 50 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
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MAX3822 Evaluation Kit Evaluates: MAX3822
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 50 test equipment. Side-mount SMA connectors are used for the MAX3822's signal I/O ports. To simplify interfacing to 50 test equipment, the EV kit provides AC-coupling for the MAX3822's CML inputs and outputs. All differential input and output data paths are 50 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 accomplished 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
NAME J9 TYPE 3-pin header FUNCTION 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. 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. 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. 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.
J18
3-pin header
J19
3-pin header
J20
3-pin header
2
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MAX3822 Evaluation Kit Evaluates: MAX3822
Table 1. Jumpers, Test Points, and Indicators (continued)
NAME J21 TYPE 3-pin header FUNCTION 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. 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. Jumper from Power Supply to the Device VCC Jumper from Power Supply to the LEDs LOP Indicator for Channel 1. Lights when limiting amplifier 1 is in the LOP state. LOP Indicator for Channel 2. Lights when limiting amplifier 2 is in the LOP state. 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. General LOP Indicator. Lights when any of the four limiting amplifiers is in the LOP state. Power-Supply Connection Ground Connection Coarse Power-Detection Threshold Adjustment Fine Power-Detection Threshold Adjustment
J22 J23 J24 LED1 LED2 LED3 LED4 LOP LED5 VCC GND R7 R8
3-pin header 2-pin header 2-pin header LED LED LED LED LED Test point Test point Potentiometer Potentiometer
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MAX3822 Evaluation Kit Evaluates: MAX3822
3 2 J9 C17 0.033F C18 0.033F 1 3 2 1 C1 0.1F C2 0.1F C3 0.1F C4 0.1F C5 0.1F C6 0.1F C7 0.1F C8 0.1F P1 P2 P3 P4 P5 P6 P7 J5 P8 P9 P10 P11 P12 IN1+ IN1VCC IN2+ IN2VCC VCC IN3+ IN3VCC IN4+ IN4LOP1 LOP2 LOP3 LOP4 GND CZ4CZ4+ GND CZ3CZ3+ GND LOP R7 1k C9 0.1F P40 P39 P38 P37 P48 P47 P46 P45 P44 P43 P42 P41 C10 0.1F OUT1+ OUT1VCC U1 MAX3822 OUT2+ OUT2VCC VCC OUT3+ OUT3VCC OUT4+ OUT4P36 P35 P34 P33 P32 P31 P30 P29 P28 P27 P26 P25 C11 0.1F C12 0.1F C13 0.1F C14 0.1F C15 0.1F C16 0.1F J21 R4 150 R3 150 R2 150 R1 150 R5 150 LED4 R6 100 R8 200 C25 C21 C28 0.1F 0.1F 0.1F L1 56nH L2 56nH C27 2.2F
GND
C26 33F J23 J24 VCC
J1
J10
GND CZ1+ CZ1GND CZ2+ CZ2GND CS
GND GND
J2
VTH GND
J11
J3
J12
J4
J13
J14
J6
J15
J7
J16
P13 P14 P15 P16 P17 P18 P19 P20 P21
P22 P23
J8
P24
J17
C19 0.033F
C20 0.033F
J20
LED3
J19
LED2
J18
LED1
J22
LED5
Figure1. MAX3822 EV Kit Schematic 4 _______________________________________________________________________________________
MAX3822 Evaluation Kit Evaluates: MAX3822
1.0"
1.0"
Figure 2. MAX3822 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX3822 EV Kit PC Board Layout--Component Side
1.0"
1.0"
Figure 4. MAX3822 EV Kit PC Board Layout--Ground Plane
Figure 5. MAX3822 EV Kit PC Board Layout--Power Plane
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MAX3822 Evaluation Kit Evaluates: MAX3822
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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