HMC1197LP7FE datasheet(57/57 Pages) AD

57 / 57 page

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

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

3.10

using an external Vco

In order to configure HMC1197LP7FE to use with an external VCO, Register 17 needs to be configured to

disable the on chip VCO and VCO to PLL path. Enable External Buffer, second CP link and External I/O

switch. To make these changes Reg 17 [0:11] should be configured as 3157d.

HMC1197LP7FE is configured as PLL alone used with External VCO HMC384LP4E. Loop Filter components

are used as in Figure 53

Figure 53.Loop filter components for HMC1197LP7FE is configured as PLL alone used with external VCO

HMC384LP4E

Figure 54.Closed Loop Phase Noise with External HMC384LP4E VCO @ 2200 MHz.

For detailed theory of operation of PLL/VCO, please refer to the “PLLs with Integrated VCOs - RF VCOs Operating

Guide”

-180

-160

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-80

-60

-40

100

1000

10000

OFFSET (KHz)

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