The CM1693 represents the first in California Micro Devices’ family of general and special-purpose low-pass filter products featuring Praetorian III technology for high speed interface requirements.
Praetorian III is a patent-pending architecture for creating low-pass filters with high cutoff and rolloff frequencies, close-in stopbands, low total line capacitance, and very steep attenuation curves (-18 dB/octave). Praetorian III devices also maintain the stopband over DC bias. The device is said to be the first product on the market to use a coupled or stacked inductor to create low-pass filters.
The CM1693 attenuates signals starting in the 700 MHz band, an important consideration for designers of CDMA, E-GSM and eventually LTE. It has a frequency rolloff starting at 300 MHz, supporting clocks up to 96 MHz, and rise/fall times as fast as 4 nanoseconds. It integrates ±18kV contact ESD protection and its low line capacitance supports low voltage and drive level interfaces. The IC features good attenuation from 700 MHz to 6 GHz, which envelops all active cellular frequencies.
Because the CM1693 is an inductor-based low-pass filter, rise and fall times are significantly faster than traditional RC-based filters. This has proven to be an important consideration for digital signal integrity. The inductor-based design also means that the attenuation mask has very little sensitivity to DC bias. The device’s C-L-L-C architecture (12 pF – 26 nH – 10 F per channel) provides 4, 6 and 8 channel configurations to provide layout and placement flexibility.
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