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Programmable LPF Screens ADC Circuits

April 30, 2013
This lowpass filter provides programmable screening of bandwidths from 5 to 72 MHz suitable for integration into microwave radios.

Model HMC1023LP5E is an integrated-circuit (IC) lowpass filter (LPF) with programmable gain from 0 to 10 dB across bandwidths from 5 to 72 MHz, the latter the new bandwidth used in microwave radios. This sixth-order, fully calibrated filter is ideal for baseband and intermediate-frequency (IF) signal-processing applications and can achieve more than 80-dB attenuation of unwanted signals. It adds a typical noise figure of 10 dB, with third-order intercept of typically +30 dBm and second-order intercept of typically +60 dBm. When calibrated, the programmed bandwidth is accurate within ±2.5%. The filter circuit includes an integrated analog-to-digital-converter (ADC) driver, programmable input impedance, and adjustable output common mode voltage from 0.9 to 3 V with a 2 Vpp signal. A built-in filter bypass option enables bandwidth of 100 MHz or more while maintaining programmed gain and common mode control settings. The LPF, which draws typically 240 mA from a +5-VDC supply, is housed in a 5 x 5 mm plastic leadless surface-mount package and can handle operating temperatures from -40 to +85°C.

Hittite Microwave Corp., 2 Elizabeth Dr., Chelmsford, MA 01824; (978) 250-3343, FAX: (978) 250-3373, www.hittite.com

About the Author

Jack Browne | Technical Contributor

Jack Browne, Technical Contributor, has worked in technical publishing for over 30 years. He managed the content and production of three technical journals while at the American Institute of Physics, including Medical Physics and the Journal of Vacuum Science & Technology. He has been a Publisher and Editor for Penton Media, started the firm’s Wireless Symposium & Exhibition trade show in 1993, and currently serves as Technical Contributor for that company's Microwaves & RF magazine. Browne, who holds a BS in Mathematics from City College of New York and BA degrees in English and Philosophy from Fordham University, is a member of the IEEE.

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