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| 19-2388; Rev 0; 4/02 MAX3274 Evaluation Kit General Description The MAX3274 evaluation kit (EV kit) simplifies evaluation of the MAX3274 limiting amplifier. The EV kit allows quick threshold level selections, provides appropriate impedance matching circuitry, and includes calibration circuits. The MAX3274 EV kit is fully assembled and tested. Features o Test Points for Easy Monitoring of LOS and LOS o Separate Pullup Supply (VLOS) Pin for LOS and LOS Outputs o Jumpers Allow Quick Selection for Loss-of-Signal Threshold Level, Squelch, and Bandwidth Evaluates: MAX3274 Component List DESIGNATION C1, C4 C2, C5-C15 C3 QTY 2 12 1 DESCRIPTION 33F 10%, 10V min tantalum capacitors (case B) 0.1F 10%, 10V min ceramic capacitors (0402) 0.1F 10%, 10V min ceramic capacitor (0603) SMA connectors, edge mount, tab centers EFJohnson 142-0701-851 2-pin headers, 0.1in centers Shunts 4.7H inductor Coilcraft 1008CT-040XKBC (1008) 4.7k 5% resistors (0402) 1.5k 1% resistor (0402) 681 1% resistor (0402) 401 1% resistor (0402) Open Test points Digi-Key 5000K-ND MAX3274UGE (MAX3274EVKIT) MAX3274, rev B, EV kit circuit board MAX3274 data sheet SUPPLIER AVX 1 4 1 1 2 2 5 1 1 1 Coilcraft Murata Venkel PART MAX3274EVKIT Ordering Information TEMP RANGE 0C to +85C IC PACKAGE 16 QFN J1-J8 JU1-JU4, JU6, JU7 JU1-JU4, JU6, JU7 L1 R1, R2, R6, R8 R3 R4 R5 R9, R10 TP1, TP2, GND, VCC, VLOS U1 None None 8 6 6 Component Suppliers PHONE 803-946-0690 847-639-6400 770-436-1300 800-950-8365 FAX 803-626-3123 847-639-1469 770-436-3030 512-794-0087 ________________________________________________________________ Maxim Integrated Products 1 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. MAX3274 Evaluation Kit Evaluates: MAX3274 Quick Start 1) Connect OUT+ and OUT- to a 50 terminated oscilloscope. 2) Connect IN+ and IN- to a 500mVP-P, 2.125Gbps differential data stream. 3) Remove jumper JU6 to disable squelch. 4) Connect shunt at jumper JU7 to use VCC as the pullup supply for LOS and LOS outputs. 5) Connect shunt at jumper JU4 for 2.125Gbps operation. 6) Connect a +3.3V power supply to the VCC pad, and then connect the power-supply ground to the GND pad. 7) Observe a limited signal at the output (~1.1VP-P differential for the MAX3274). Calibration Strip The calibration strip can be used to calibrate out the effects of the circuit board, such as connectors, in critical measurements such as deterministic jitter and rise/fall times. Table 1. Jumpers NAME FUNCTION Selects input bandwidth, open for 1.0625Gbps and closed for 2.125Gbps Closed to enable squelch, opened to disable squelch When using an external pullup supply for LOS and LOS other than VCC, remove jumper JU1, JU2, JU3 Select loss-of-signal threshold level JU4 JU6 JU7 Detailed Description The MAX3274 dual-rate limiting amplifier is designed to accept a differential signal from a 100 differential output transimpedance preamplifier. In order for output data to be valid, incoming data must be above the threshold voltage set by placing a shunt at jumper JU1, JU2, or JU3. LOS and LOS are open-collector outputs and indicate whether the input data stream voltage is below the threshold voltage. The EV kit supplies the required pullup resistors for LOS and LOS. Placing a shunt at jumper JU6 enables squelch and disables output if incoming data voltage is below the threshold level. The shunt can be removed from jumper JU7 if the user wants to interface the LOS and LOS pins with a voltage different from VCC. With a shunt at jumper JU4, the input filter is disabled and the chip is ready to accept data at 2.125Gbps. To evaluate the chip at 1.0625Gbps, remove the shunt at jumper JU4. 2 _______________________________________________________________________________________ MAX3274 Evaluation Kit Evaluates: MAX3274 VCC L1 4.7H JU7 VLOS C1 33F GND C2 0.1F C5 0.1F C6 0.1F C7 0.1F C4 33F C3 0.1F R1 4.7k TP1 16 SMA J1 IN+ C8 0.1F 1 C9 0.1F INSMA J2 2 ININ+ GND 15 LOS 14 LOS R2 4.7k TP2 13 GND 12 R10* C11 0.1F OUTSMA J4 C10 0.1F OUT+ SMA J3 OUT+ U1 MAX3274 OUT- 11 3 VCC VCC 10 4 BWSEL TH 9 R3 1.5k R4 681 R5 401 TEST 5 SQUELCH 6 VCC 7 GND 8 JU1 JU4 R8 4.7k C13 0.1F SMA J6 CALIBRATION STRIP R9 OPEN C12 0.1F SMA J5 C14 0.1F SMA J7 NC JU6 R6 4.7k C15 0.1F SMA J8 JU2 JU3 R10*- OPEN Figure 1. MAX3274 EV Kit Schematic _______________________________________________________________________________________ 3 MAX3274 Evaluation Kit Evaluates: MAX3274 Figure 2. MAX3274 EV Kit Component Placement Guide--Component Side 4 _______________________________________________________________________________________ MAX3274 Evaluation Kit Evaluates: MAX3274 Figure 3. MAX3274 EV Kit PC Board Layout--Component Side Figure 4. MAX3274 EV Kit PC Board Layout--Ground Plane Figure 5. MAX3274 EV Kit PC Board Layout--Power Plane Figure 6. MAX3274 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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