19-2792; Rev 0; 3/03 MAX4383 Evaluation Kit Features ♦ Video Filter Solution for ATSC and HighResolution Graphics Applications ♦ 5-Pole Active Multiple Feedback (Rauch) Video Filter ♦ 30MHz Bandwidth at -3dB (typ) ♦ >40dB Attenuation at 74.25MHz ♦ +5V Single-Supply or ±5V Dual-Supply Operation ♦ Surface-Mount Construction ♦ Fully Assembled and Tested ♦ Eliminates Costly Inductors with More Accurate R-C Components Ordering Information PART TEMP RANGE IC PACKAGE MAX4383EVKIT 0°C to +70°C 14 TSSOP Simplified Circuit R13 R12 R2 R7 C1 C4 R11 VCC R3 R1 INPUT R14 VCC U1A R5 R6 VCC C2 U1B VEE R16 C6 R9 C3 VEE VCC U1C R4 R15 VEE R10 R8 C5 OUTPUT U1D VEE Typical Application Circuit LOWPASS FILTER G = 2V/V R15 ZO = 75Ω DAC MPEG ENCODER R16 DAC LOAD DISPLAY DOES VIDE O MAX4383 EV Kit ________________________________________________________________ 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: MAX4383 General Description The MAX4383 evaluation kit (EV kit) demonstrates the capability of the high-speed MAX4383 op amp configured in a 5-pole, lowpass, multiple feedback (Rauch) filter that provides a Butterworth response with a bandwidth of -3dB at 30MHz (typ). This circuit can be used for video anti-aliasing and reconstruction filtering for HDTV, Progressive DVD, and XGA resolution graphics displays. The MAX4383 EV kit is designed to drive a 75Ω back-terminated load, common in video applications, with an overall gain of 1. The MAX4383 EV kit is a fully assembled and tested surface-mount board that operates from either a +5V single supply or ±5V dual supplies. Evaluates: MAX4383 MAX4383 Evaluation Kit Component Suppliers PHONE FAX Murata SUPPLIER 770-436-1300 770-436-3030 www.murata.com WEBSITE Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Please indicate that you are using the MAX4383 when contacting these suppliers. Component List Required equipment: • Dual ±5.0V DC power supply • Signal generation platform (e.g., Tektronix TG 2000) DESIGNATION QTY C1, C4 2 3.3pF ±0.25pF, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H3R3CT 1 68pF ±5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H680J or TDK C1608C0G1H680JT 1 27pF ±5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H270J or TDK C1608C0G1H270JT 1) Connect the output from the 75Ω video signal generator to the INPUT BNC connector on the EV kit. 1 33pF ±5%, 50V C0G ceramic capacitor (0603) Taiyo Yuden UMK107CG330JZ or TDK C1608C0G1H330JT 1 100pF ±5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H101J TDK C1608C0G1H101JT 3) Connect the +5.0V supply to the VCC pad. Connect ground to the GND pad. 4) Connect the -5.0V supply to the VEE pad. For singlesupply (+5.0V) operation, connect VEE to ground and bias the input appropriately. C7, C9 2 10µF ±20%, 6.3V X5R ceramic capacitors (0805) Taiyo Yuden JMK212BJ106MG or TDK C2012X5R0J106M C8, C10 2 0.1µF ±10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K R1, R2, R4, R5, R7–R13 11 210Ω ±1% resistors (0805) R3 1 100Ω ±1% resistor (0805) C2 DESCRIPTION Quick Start • Video measurement set (e.g., Tektronix VM 700A) The MAX4383 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for board operation. Do not turn on the power supply until all connections are completed. Procedures C3 C5 C6 R6 1 121Ω ±1% resistor (0805) R14, R15, R16 3 75Ω ±1% resistors (0805) R17 0 Not installed, resistor (0805) U1 1 MAX4383EUD (14-pin TSSOP) INPUT, OUTPUT 2 BNC connectors None 1 MAX4383 PC board 2 2) Connect the input of the 75Ω video measurement set to the OUTPUT BNC connector on the EV kit. 5) Set the signal generator for multiburst sweep. 6) Turn on the ±5.0V DC power supply. 7) Analyze the filtered output signal with the VM700 video measurement set. Note: The generator (signal source) and the video test set (load) must be 75Ω terminated, and the signal source must also provide a DC return to ground. This is the function of R16 and R15, respectively. These resistors are set to 75W in the MAX4383 EV kit. If a 50Ω system is used, R16 must be changed to 50Ω. If a 50Ω analyzer is used, R15 must be 50Ω. The DAC must supply a DC voltage to bias the input of the MAX4383. If your DAC has insufficient bias to do this, add a 5.6kΩ resistor between VCC and the junction of R16 and R14. _______________________________________________________________________________________ MAX4383 Evaluation Kit The MAX4383 EV kit is a fully assembled and tested surface-mount circuit board that demonstrates the capability of the high-speed MAX4383 op amp configured in a 5-pole, active lowpass multiple feedback filter circuit. The filter can be used for video anti-aliasing or as a reconstruction filter for ATSC (HDTV) or high-resolution (XGA) graphics. The circuit has a 75Ω DAC load (R16), a gain of 2V/V, and a 75Ω source (R15) for driving a 75Ω back-terminated load to an overall gain of 1. The board operates from either a +5V single supply or ±5V dual supplies. GAIN vs. FREQUENCY MAX4383EV fig01 5 0 -5 GAIN (dB) -10 -15 -20 -25 -30 -35 -40 -45 1 10 100 FREQUENCY (MHz) Figure 1. Gain vs. Frequency Response of the EV Kit Filter The MAX4383 EV kit demonstrates a lower cost, but more accurate way to design video filters. Using R-C, rather than L-C components, it provides a 30MHz, -3dB bandwidth with >40dB rejection at 74.25MHz (Figure 1), as well as group-delay compensation and buffering using a single MAX4383 quad op amp. The improved tolerance of R-C, versus L-C components, removes the need for production tuning. Some initial tuning may be required to account for the variation in the DAC load and parasitic components due to PC board layout differences. The MAX4383 EV kit uses dual supplies, but the MAX4383 can be run from a single supply. The MAX4383 EV kit is a Rauch, or multiple feedback realization of a 5-pole modified Legendre characteristic using one 1st-order +6dB gain stage and two 2nd-order unity-gain stages. The final stage is a 1st-order group delay compensator, which drives the back-terminated 75Ω load to an overall unity gain. There are three sensitive points in the circuit; R14, which controls the real pole, C1 and C4, that control the high-frequency poles, and C5 that sets the group delay compensation. The MAX4383 EV kit comes with a 75Ω termination (R16) and a BNC connector (INPUT) in place of the DAC normally found at the input for measurement purposes, and this reduces the gain to -6dB overall. The values of R14 and R16 are based on the DAC with a typical load resistance of 25Ω to 35Ω. To accommodate different load resistors, adjust the value of the R14 and the C6 product accordingly. The values of C1 and C4 reflect a two-sided PC board with minimal ground plane around the op amps pins. C5 adjusts the group delay compensation. Adjust the value of C1 and C4 for bandwidth before adjusting C5 for group-delay variation compensation. _______________________________________________________________________________________ 3 Evaluates: MAX4383 Detailed Description Evaluates: MAX4383 MAX4383 Evaluation Kit VCC R14 75Ω INPUT 3 BNC GND C7 10µF C9 10µF C8 0.1µF C10 0.1µF 11 4 INA+ VEE VEE OUTD VCC C6 100pF R16 75Ω R15 75Ω 14 OUTPUT BNC R11 210Ω R13 210Ω R17 OPEN U1 2 INA- MAX4383 IND- 13 R12 210Ω 1 OUTA R1 210Ω C2 68pF IND+ 12 C5 33pF R3 100Ω R2 210Ω 6 INB- OUTC INB+ INC+ R10 210Ω R9 210Ω C4 3.3pF R7 210Ω 8 C1 3.3pF 5 10 R4 210Ω R8 210Ω 7 R5 210Ω OUTB INC- 9 R6 121Ω C3 27pF ALL RESISTORS ARE ±1%. Figure 2. MAX4383 EV Kit Schematic 4 _______________________________________________________________________________________ MAX4383 Evaluation Kit Evaluates: MAX4383 Figure 3. MAX4383 EV Kit Component Placement Guide— Component Side Figure 4. MAX4383 EV Kit PC Board Layout—Component Side Figure 5. MAX4383 EV Kit PC Board Layout—Solder Side Figure 6. MAX4383 EV Kit Component Placement Guide— 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 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.