HMC701LP6CE datasheet(20/40 Pages) AD

20 / 40 page

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

HMC701LP6CE

v09.1112

8 GHz 16-BIT FRACTIONAL-N PLL

where

Nint

is the integer division ratio, an integer number between 36 and 65,533

(dsm_intg (Reg0Fh table 26))

Nfrac

is the fractional part, a number from 1 to 224 (dsm_frac Reg10h table 27)

is the reference path division ratio, (rfp_div_ratio Reg03h<13:0> table 14)

fxtal

is the frequency of the crystal oscillator input (XSin or XrEF Figure 4)

as an Example:

fxtal

= 50 MHz

= 1

fref

= 50 MHz

Nint

= 46

Nfrac

= 1

(EQ 14)

in this example the output frequency of 2,300,000,002.98 Hz is achieved by programming the 16-bit binary value of

46d = 2Eh = 0000 0000 0010 1110 into dsm_intg.

Similarly the 24-bit binary value of the fractional word is written into dsm_frac,

1d = 000 001h = 0000 0000 0000 0000 0000 0001

Example 2: Set the output to 4.600 025 GHz using a 100 MHz reference, r=2.

Find the nearest integer value, nint, nint = 92, fint = 4.600 000 GHz

this leaves the fractional part to be ffrac =25 kHz

(EQ 15)

Since Nfrac must be an integer number, the actual fractional frequency will be 25,001.17 Hz, an error of 1.17 Hz.

Here we program the 16-bit nint = 92d = 5ch = 0000 0000 0101 1100 and

the 24-bit nfrac = 8389d = 20c5h = 0000 0010 0000 1100 0101

in addition to the above frequency programming words, the fractional mode must be enabled using the frac register.

other DSM configuration registers should be set to the recommended values. register setup files are available on

request.

Integer Frequency

the synthesizer is capable of operating in integer mode. in integer mode the digital Δ∑ modulator is normally shut

off and the division ratio of the Vco divider is set at a fixed value. to run in integer mode set dsm_integer_mode

(Reg12h<3> table 29) and clear dsm_rstb (Reg01h<13> table 12). then program the integer portion of the frequency,

NINT, as explained by (EQ 13), ignoring the fractional part.

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

HMC701LP6CE датащи(PDF) 20 Page - Analog Devices

HMC701LP6CE датащи(HTML) 20 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

датащи скачать

ссылки URL