Evaluates: MAX7408–MAX7415/
MAX7418–MAX7425
MAXFILTERBRD
General Description
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-compat-
ible 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
Component Supplier
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 0Not 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+
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.
2 Maxim Integrated
Evaluates: MAX7408–MAX7415/
MAX7418–MAX7425
MAXFILTERBRD
Quick Start
Required Equipment
• 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 4VP-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
FUNCTION GENERATOR 1
SINE-WAVE INPUT
OSCILLOSCOPE
MAXFILTERBRD
EV KIT
POWER SUPPLY
HP E3610 OR SIMILAR
Tektronix TDS3012
OR SIMILAR
EXTERNAL CLOCK
GND +5V/+3V
SINE-WAVE FREQUENCY:
0.001kHz TO 15kHz
FILTER’S SINE-WAVE OUTPUT
AMPLITUDE: 4VP-P MAX
OFFSET: 2.2VDC TYPICAL
Agilent 33120A OR SIMILAR
3Maxim Integrated
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:
fOSC (kHz) = k/C1 (pF)
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.
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.
4 Maxim Integrated
Evaluates: MAX7408–MAX7415/
MAX7418–MAX7425
MAXFILTERBRD
Figure 2. MAXFILTERBRD Schematic
NOTE: INSTALL COMPONENTS FROM SUGGESTED COMPONENTS.
MAX7410 EXAMPLE: INTERNAL OSCILLATOR WITH fC APPROXIMATELY 5kHz.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 5
© 2009 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
Evaluates: MAX7408–MAX7415/
MAX7418–MAX7425
MAXFILTERBRD
Figure 3. MAXFILTERBRD Component Placement Guide—
Component Side
Figure 5. MAXFILTERBRD PCB Layout—Solder Side
Figure 4. MAXFILTERBRD Component PCB Layout—
Component Side
Figure 6. MAXFILTERBRD Component Placement Guide—
Solder Side
