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

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

11

HMC702LP6CE

v10.0812

14 GHz 16-BIT FRACTIONAL-N PLL

RF Path ’N’ Divider

the main rF path divider including a fixed divide-by-2, is capable of average divide ratios of even numbers between

131,062 and 72 in fractional mode, and 131,070 to 64 in integer mode. the reason for the difference between integer

and fractional modes is that the fractional divider actually divides by up to ±4 from the average divide number. actual

division ratios when used with a given Vco will depend upon the reference frequency used and the desired output

band.

General Purpose Output (GPO) Interface

the HMc702LP6cE features a 3-wire General Purpose output (GPo) interface. GPo registers are described in

access including:

a. General Data output from SPi register gpo_sel_0_

data (gpo_sel=0)

b. Prescaler & reference path outputs (gpo_sel=1)

c. Lock Detect Windows (gpo_sel=2)

d. anti-cycle Slip waveforms (gpo_sel=3)

e. internal synchronized frac strobe with clocks

(gposel=4)

f. Δ∑ Modulator Phase accumulator (gposel=6)

g. auxiliary oscillators (gposel=7)

h. Multiple Vco control, Latch Enables (gposel=9)

i. Δ∑ Modulator outputs (gposel=10)

General Data to GPO (gpo_sel=0)

bus.

Prescaler and Reference Path Outputs (gpo_sel = 1)

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

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