19-4884; Rev 0; 8/09 MAXFILTERBRD The MAXFILTERBRD is an unpopulated PCB design to evaluate the MAX7408–MAX7415/MAX7418–MAX7425 5th-order, lowpass, switched-capacitor filters (SCFs). Contact the factory for free samples of the pin-compatible MAX7408–MAX7415/MAX7418–MAX7425 SCFs to evaluate these devices. Features S CLK Pad for External Clock Frequency S Lead(Pb)-Free and RoHS Compliant S Proven PCB Layout Ordering Information PART TYPE MAXFILTERBRD+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Part Selection Table OPERATING VOLTAGE PART FILTER TYPE MAX7408CUA+ 5V Elliptic MAX7409CUA+ 5V Bessel MAX7410CUA+ 5V Butterworth MAX7411CUA+ 5V Elliptic MAX7412CUA+ 3V Elliptic MAX7413CUA+ 3V Bessel MAX7414CUA+ 3V Butterworth MAX7415CUA+ 3V Elliptic MAX7418CUA+ 5V Elliptic MAX7419CUA+ 5V Bessel MAX7420CUA+ 5V Butterworth MAX7421CUA+ 5V Elliptic MAX7422CUA+ 3V Elliptic MAX7423CUA+ 3V Bessel MAX7424CUA+ 3V Butterworth MAX7425CUA+ 3V Elliptic Component List (Suggested Components) DESIGNATION DESCRIPTION 0 Not installed, 47pF Q5%, 50V C0G ceramic capacitor (0805) Murata GRM2165C1H470J or similar 0 Not installed, 2200pF Q5%, 50V C0G ceramic capacitor (0805) Murata GRM2165C1H222J or similar C3, C4 0 Not installed, 0.1FF Q10%, 16V X7R ceramic capacitors (0603) Murata GCM188R71C104K or similar JU1, JU2 0 Not installed, 2-pin headers— shorted by PC trace R1 0 Not installed, 10kI Q1% resistor (0805) U1 0 Not installed, lowpass SCF (8 FMAXM) See the Part Selection Table — 1 PCB: MAXFILTERBRD+ C1 C2 Note: Contact the factory to order a free sample of any of the SCF parts. QTY Component Supplier SUPPLIER Murata Electronics North America, Inc. PHONE 770-436-1300 WEBSITE www.murata-northamerica.com Note: Indicate that you are using the MAXFILTERBRD when contacting this component supplier. µMAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX7408–MAX7415/MAX7418–MAX7425 General Description Evaluates: MAX7408–MAX7415/MAX7418–MAX7425 MAXFILTERBRD OSCILLOSCOPE Tektronix TDS3012 OR SIMILAR SINE-WAVE INPUT FUNCTION GENERATOR 1 Agilent 33120A OR SIMILAR SINE-WAVE FREQUENCY: 0.001kHz TO 15kHz FILTER’S SINE-WAVE OUTPUT FILTEREVKIT AMPLITUDE: 4VP-P MAX OFFSET: 2.2VDC TYPICAL EXTERNAL CLOCK GND +5V/+3V POWER SUPPLY HP E3610 OR SIMILAR Figure 1. Filter Evaluation Test Block Diagram Quick Start • MAXFILTERBRD Required Equipment • Suggested components (see Component List) • 5 V or 3V DC power supply (depending on the IC installed) • Function generator (e.g., HP 33120A) • 2-channel digital oscilloscope (e.g., Tektronix TDS3012) the 5V supply to the VDD pad and the negative terminal of the supply to the GND pad closest to the VDD pad. If the installed IC is the MAX7412–MAX7415 or MAX7422–MAX7425, connect the positive terminal of the 3V supply to the VDD pad and the negative terminal of the supply to the GND pad closest to the VDD pad (see Figure 1). Set the function generator to 4VP-P max, 2.2V offset (typ), and 1kHz sine wave, and connect the signal to the IN pad. Procedure 3) C onnect the first channel of the oscilloscope to the IN pad. Caution: Do not turn on power supply until all connections are completed. 4) C onnect the second channel of the oscilloscope to the OUT pad. 1) Install all suggested components shown in the Component List onto the MAXFILTERBRD. 5) C onnect the oscilloscope’s ground probe to any GND pads. 2) If the installed IC is the MAX7408–MAX7411 or MAX7418–MAX7421, connect the positive terminal of 6) Turn on the power supply. 7) Verify the output on the OUT pad. 2 _______________________________________________________________________________________ MAXFILTERBRD The MAXFILTERBRD is an unpopulated PCB design to evaluate the MAX7408–MAX7415/MAX7418–MAX7425 5th-order, lowpass SCFs. Internal Clock The MAXFILTERBRD uses the internal oscillator when a capacitor is installed on C1. Refer to corresponding installed IC data sheet. For the MAX7409/MAX7410/MAX7413/MAX7414, the frequency can be altered using the following formula: fOSC (kHz) = k/C1 (pF) External Clock An external clock that matches the specification of the corresponding IC data sheet can be used by cutting the trace of jumper JU2. Drive the CLK pin with a CMOS gate powered from 0 to VDD. Apply the clock signal to the CLK pad. Shutdown The MAXFILTERBRD is configured for normal operation once the desired IC is installed. The desired IC enters shutdown by cutting the trace of jumper JU1 and driving the IC SHDN pin low through the side of the jumper that is still connected to the part. where k = 30 x 103 and fOSC is the internal oscillator frequency. For the MAX7408/MAX7411/MAX7412/MAX7415, k = 27 x 103. For the MAX7418/MAX7421/MAX7422/MAX7425, k = 87 x 103. For the MAX7419/MAX7420/MAX7423/MAX7424, k = 110 x 103. _______________________________________________________________________________________ 3 Evaluates: MAX7408–MAX7415/MAX7418–MAX7425 Detailed Description of Hardware NOTE: INSTALL COMPONENTS FROM SUGGESTED COMPONENTS. MAX7410 EXAMPLE: INTERNAL OSCILLATOR WITH fC APPROXIMATELY 5kHz. Evaluates: MAX7408–MAX7415/MAX7418–MAX7425 MAXFILTERBRD Figure 2. MAXFILTERBRD Schematic 4 _______________________________________________________________________________________ MAXFILTERBRD Figure 5. MAXFILTERBRD PCB Layout—Solder Side Figure 4. MAXFILTERBRD Component PCB Layout— Component Side Figure 6. MAXFILTERBRD Component Placement Guide— Solder Side Evaluates: MAX7408–MAX7415/MAX7418–MAX7425 Figure 3. MAXFILTERBRD Component Placement Guide— Component 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 © 2009 Maxim Integrated Products 5 Maxim is a registered trademark of Maxim Integrated Products, Inc.