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HMC701LP6CE Datasheet(PDF) 7 Page - Hittite Microwave Corporation |
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HMC701LP6CE Datasheet(HTML) 7 Page - Hittite Microwave Corporation |
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7 / 46 page  For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 11 11 - 8 HMC701LP6CE v03.0709 8 GHz 16-Bit Fractional-N Synthesizer 1. reference Path input Buffers 2. reference Path Divider 3. Vco Path input Buffer 4. Vco Path Multi-Modulus Prescaler/Divider 5. Δ∑ fractional Modulator 6. Phase frequency Detector 7. charge Pump 8. Main serial Port 9. Vco serial Port for stepped Vco support 10. temperature sensor 11. Power on reset circuit 12. Vco autocalibration subsystem 13. cW sweeper subsystem 14. auxiliary clock Generator 15. General Purpose output (GPo) Bus 16. Multiple Vco controller Theory of Operation the hMc701LP6ce synthesizer consists of the following functional blocks each of these blocks is described briefly in the following section. Reference Path the full reference Path block diagram is shown in figure 7. the ultra low noise phase detector requires the best possible reference signal. since a given application may desire to use a square wave or a 50 ohm sinusoidal crystal source, hMc701LP6ce offers two input ports, each one optimized for the lowest possible noise for the source type being used. for absolute best low noise performance, the sine wave path should be used. the user should use only one ref path input, that is the input that matches their reference source type. note the input is defaulted to the square wave input on power up. should the sine reference path be used, it is necessary to enable the sine input, shut down the square wave input and set the mux (rfp_buf_sin_en=1, rfp_buf_sq_en=0, rfp_buf_sin_sel=1, table 12). the unused port should be left open. the reference path supports input frequencies of up to 200 Mhz typical, however the maximum frequency at the phase detector (PfD) depends upon the mode of operation, worst case at +85°c, 70 Mhz in fractional mode and 110 Mhz in integer mode. hence reference inputs of greater than the PfD maximum frequency must use the appropriate r divider setting. a further restriction exists. if the Vco auto calibration feature is used, the reference input must not exceed 60 Mhz. Figure 7. Reference Sine Input Stages the unused reference port is normally not connected. |
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