MAXFILTERBRD

MAXFILTERBRD MAXIM | Alldatasheet

Document overview

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• PDF pages: 5

Technical content

Features

S CLK Pad for External Clock Frequency S Lead(Pb)-Free and RoHS Compliant S Proven PCB Layout

Ordering Information

Part Selection Table Component List (Suggested Components) 19-4884; Rev 0; 8/09 +Denotes lead(Pb)-free and RoHS compliant. Note: Contact the factory to order a free sample of any of the SCF parts. µMAX is a registered trademark of Maxim Integrated Products, Inc. Note: Indicate that you are using the MAXFILTERBRD when contacting this component supplier. PART TYPE MAXFILTERBRD+ EV Kit PART OPERATING VOLTAGE 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 DESIGNATION QTY DESCRIPTION C1 0 Not installed, 47pF Q5%, 50V C0G ceramic capacitor (0805) Murata GRM2165C1H470J or similar C2 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 FMAX See the Part Selection Table — 1 PCB: MAXFILTERBRD+ SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

• MAXFILTERBRD
• Suggested components (see the Component List)
• 5V or 3V DC power supply (depending on the IC installed)
• Function generator (e.g., HP 33120A)
• 2-channel digital oscilloscope (e.g., Tektronix TDS3012) Procedure Caution: Do not turn on power supply until all connec - tions are completed. 1) Install all suggested components shown in the Component List onto the MAXFILTERBRD. 2) If the installed IC is the MAX7408–MAX7411 or MAX7418–MAX7421, connect the positive terminal of the 5V supply to the VDD pad and the negative termi- nal 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 4V P-P max, 2.2V offset (typ), and 1kHz sine wave, and connect the signal to the IN pad. 3) Connect the first channel of the oscilloscope to the IN pad. 4) Connect the second channel of the oscilloscope to the OUT pad. 5) Connect the oscilloscope’s ground probe to any GND pads. 6) Turn on the power supply. 7) Verify the output on the OUT pad.

Figure 1. Filter Evaluation Test Block Diagram

Evaluates: MAX7408–MAX7415/ MAX7418–MAX7425 MAXFILTERBRD Detailed Description of Hardware 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 the corresponding installed IC data sheet. For the MAX7409/MAX7410/MAX7413/MAX7414, the frequency can be altered using the following formula: f OSC (kHz) = k/C1 (pF) where k = 30 x 10 3 and f OSC 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. 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.

Figure 2. MAXFILTERBRD Schematic NOTE: INSTALL COMPONENTS FROM SUGGESTED COMPONENTS. MAX7410 EXAMPLE: INTERNAL OSCILLATOR WITH fC APPROXIMATELY 5kHz.