MAXFILTERBRD
Evaluates: MAX7408–MAX7415/
MAX7418–MAX7425
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 10 3 .
For the MAX7418/MAX7421/MAX7422/MAX7425, k = 87 x 10 3 .
For the MAX7419/MAX7420/MAX7423/MAX7424, k = 110 x 10 3 .
Maxim Integrated
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.
3
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