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HMC900LP5E データシート(PDF) 18 Page - Analog Devices |
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HMC900LP5E データシート(HTML) 18 Page - Analog Devices |
18 / 26 page For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 3 - 18 3 HMC900LP5E v04.0811 50 MHz DUAL PROGRAMMABLE LOW PASS FILTER with DRIVER Output Driver The HMC900lP5e output driver consists of a differential class aB driver which is designed to drive typical aDC loads directly or can drive up to 200Ω in parallel with 50 pF to aC ground per differential output. Note that the output common mode of the driver is controlled directly via the CMI/CMQ pin and can be set as per “Table 1. electrical specifications”. also note, that driver loading does not impact filter transfer responses. The output common mode of the driver is controlled directly via the CMI/CMQ pin and can be set as per the “Table 1. electrical specifications”. a block diagram showing output connections is presented below. Figure 22. Output Driver Block Diagram RC Calibration Circuit The RC Calibration block uses a known user supplied clock to measure an on chip RC time constant. This measurement is representative of the uncorrected corner frequency error for a given bandwidth for the lPF. Calibration is normally done at room temperature Refer to “Table 1. electrical specifications” for further details on the variation of the 3dB cutoff point with temperature. With this information, the HMC900lP5e can correctly fine tune the lPF by adjusting the resistors in the lPF to center the corner frequency to the desired bandwidth. The calibration for the HMC900lP5e proceeds as follows: 1. the clock used for calibration is programmed between 20 MHz and 100 MHz via Reg 05h. also note that for clocks between 20 MHz and 40 MHz the doubler must be enabled via Reg 01h. 2. the RC calibration circuit is enabled via Reg 01h. 3. a calibration cycle is initialized by writing to Reg 04h. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. For price, delivery, and to place orders: Analog Devices, Inc., One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 Phone: 781-329-4700 • Order online at www.analog.com Application Support: Phone: 1-800-ANALOG-D |
同様の部品番号 - HMC900LP5E |
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同様の説明 - HMC900LP5E |
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