HMC1197LP7FE datasheet(28/57 Pages) AD

28 / 57 page

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

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

1.3.7.2 integer Frequency tuning

In integer mode the digital Δ∑ modulator is shut off and the N divider (Reg 03h) may be programmed to any

integer value in the range 16 to 219-1. To run in integer mode configure Reg 06h as described, then program

the integer portion of the frequency as explained by (EQ 12), ignoring the fractional part.

a. Disable the Fractional Modulator, Reg 06h[11] = 0

b. Bypass the delta-sigma modulator Reg 06h[7] = 1

c. To tune to frequencies (<2050 MHz), select the appropriate output divider valueReg 16h[5:0].

1.3.7.3 Fractional Mode

The HMC1197LP7FE is placed in fractional mode by setting the following registers:

a. Enable the Fractional Modulator, Reg 06h[11]=1

b. Connect the delta sigma modulator in circuit, Reg 06h[7]=0

1.3.7.4 Fractional Frequency tuning

This is a generic example, with the goal of explaining how to program the output frequency. Actual variables

are dependant upon the reference in use.

The HMC1197LP7FE in fractional mode can achieve frequencies at fractional multiples of the reference.

The frequency of the HMC1197LP7FE, fvco, is given by

fvco =

(Nint + Nfrac) = fint + ffrac

fxtal

(EQ 12)

fout = fvco/ k

(EQ 13)

Where:

fout

is the output frequency after any potential dividers.

is 1 for fundamental, or k = 2,4,6,…58,60,62 depending on the selected output

divider value (Reg 16h[5:0])

Nint

is the integer division ratio, Reg 03h, an integer number between 20 and

524,284

Nfrac

is the fractional part, from 0.0 to 0.99999...,Nfrac=Reg 04h/224

is the reference path division ratio, Reg 02h

fxtal

is the frequency of the reference oscillator input

fpd

is the PD operating frequency, fxtal/R

As an example:

fout

1402.5 MHz

fvco

2,805 MHz

fxtal

= 50 MHz

= 1

fpd

= 50 MHz

Nint

= 56

Nfrac

= 0.1

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rights of third parties that may result from its use. Specifications subject to change without notice. No

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