For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, 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

HMC701LP6CE

v09.1112

8 GHz 16-BIT FRACTIONAL-N PLL

Figure 5. RF Input Stage

RF Path ’N’ Divider

the main rF path divider is capable of average divide ratios between 65,531 and 36 in fractional mode, and 65,535

to 32 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 HMc701LP6cE 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. Δ∑ Modulator outputs (gposel=10)

General Data to GPO (gpo_sel=0)

bus.

Prescaler and Reference Path Outputs (gpo_sel = 1)

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

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