HMC1197LP7FE datasheet(31/57 Pages) AD

31 / 57 page

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

HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

w/ Fractional-n Pll & Vco, 100 - 4000 MHz

NINT = Reg 03h =

2800.2 10

61.44 10

VCO

floor







Reg 0Ch =

(

)

(

)

(

)

61.44 10

3072

20000

gcd 100 10 ,61.44 10

gcd

VCOk

dC h

××

−

To program Reg 04h, the closest integer-N boundary frequency fN that is less than the

desired VCO frequency fVCO must be calculated. fN = fPD ∙ NINT. Using the current example:

(

)

(

)

45 61.44 10

2764.8

2800.2 10

2764.8 10

Then Reg04h

9666560

938000

61.44 10

INT

VCO

MHz

ceil













































×−

−

1.3.7.6.2.2

Hittite exact Frequency channel Mode

If it is desirable to have multiple, equally spaced, exact frequency channels that fall within

the same interval (ie. fN ≤ fVCOk < fN+1) where fVCOk is shown in Figure 40 and 1 ≤ k ≤ 224,

it is possible to maintain the same integer-N (Reg 03h) and exact frequency register (Reg 0Ch) settings

and only update the fractional register (Reg 04h) setting. The Exact Frequency Channel Mode is possible

if (EQ 16) is satisfied for at least two equally spaced adjacent frequency channels, i.e. the channel step

size.

To configure the HMC1197LP7FE for Exact Frequency Channel Mode, initially and only at the beginning,

integer (Reg 03h) and exact frequency (Reg 0Ch) registers need to be programmed for the smallest fVCO

frequency (fVCO1 in Figure 40), as follows:

Calculate and program the integer register setting Reg 03h = NINT = floor(fVCO1/fPD), where fVCO1 is

shown in Figure 40 and corresponds to minimum channel VCO frequency. Then the lower integer

boundary frequency is given by fN = NINT ∙ fPD.

Calculate

and

program

the

exact

frequency

value

Reg

0Ch

fPD/fgcd,

where fgcd = gcd((fVCOk+1 - fVCOk),fPD) = greatest common divisor of the desired equidistant channel

spacing and the PD frequency ((fVCOk+1 - fVCOk) and fPD).

Then, to switch between various equally spaced intervals (channels) only the fractional register (Reg 04h)

needs to be programmed to the desired VCO channel frequency fVCOk in the following manner:

Reg04h=

(

)

ceil

VCOk

FRAC







−

wherefN=floor(fVCO1/fPD),andfVCO1,as showninFigure40,represents

the smallest channel VCO frequency that is greater than fN.

Example: To configure the HMC1197LP7FE for Exact Frequency Mode for equally spaced intervals of 100

kHz where first channel (Channel 1) = fVCO1 = 2800.200 MHz and Phase Detector (PD) rate fPD = 61.44

MHz proceed as follows:

First check

that the exact frequency mode for this fVCO1 = 2800.2 MHz (Channel 1)

and fVCO2 = 2800.2 MHz + 100 kHz = 2800.3 MHz (Channel 2) is possible.

(

)

(

)

































≥=

≥

×>

gcd1

gcd2

gcd1

gcd2

gcd(

)

gcd(

)

61.44 10

gcd 2800.2 10 ,61.44 10

120 10

3750

61.44 10

gcd 2800.3 10 ,61.44 10

20 10

3750

VCO

and f

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

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