HMC702LP6CE 查看數據表（PDF） - Hittite Microwave

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HMC702LP6CE

14 GHz 16-BIT FRACTIONAL-N PLL

Hittite Microwave 

v07.0411

HMC702LP6CE

14 GHz 16-BIT FRACTIONAL-N PLL

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General Data to GPO (gpo_sel=0)

Setting register gpo_sel=0 in Table 37 assigns the 3-bit data from register gpo_sel_0_data Reg1B<6:4> to the GPO

bus.

Prescaler and Reference Path Outputs (gpo_sel = 1)

Setting register gpo_sel=1 (Reg1B<3:0> Table 37) results in the input crystal being buffered out to GPO3 as shown in

Figure 6. This is useful for example to generate a copy of the input crystal signal to drive other circuits in the application,

while at the same time isolating the noisy circuits from the sensitive crystal output. Often only the synthesizer requires

very low phase noise from the crystal, hence it is desirable to isolate other circuits from the crystal itself and allow the

synthesizer sole use of the low phase noise crystal.

gpo_sel=1 also routes the 250 MHz 14-bit reference path divider to GP02 and the 16-bit 14 GHz VCO path prescaler

output to GP01. This option allows the synthesizer to function as a stand alone fractional or integer prescaler and

provides visibility into the prescaler and reference path timing for sensitive applications.

Figure 6. gpo_01 Outputs

Lock Detect Windows (gpo_sel=2)

Setting register gpo_sel = 2 (Reg1Bh<3:0> Table 37) results in the lock detect window (Figure 12) and the phase

frequency detector UP and DN output control signals (Figure 15) to be routed to pins GPO1, GPO3 and GPO2

respectively. This option gives insight into the Lock Detection Process and could allow the synthesizer to be used with

an external charge pump.

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Figure 7. gpo_02 Outputs

For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824

978-250-3343 tel • 978-250-3373 fax • Order On-line at www.hittite.com

Application Support: apps@hittite.com

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