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DKFC2072A Datasheet(PDF) 10 Page - RF Micro Devices

Part # DKFC2072A
Description  2.7GHz RF SYNTHESIZER/VCO WITH INTEGRATED RF MIXER
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Manufacturer  RFMD [RF Micro Devices]
Direct Link  http://www.rfmd.com
Logo RFMD - RF Micro Devices

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RFFC2071A/2A
DS140110
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.
External Modulation
The RFFC2071A and RFFC2072A fractional-N synthesizer can be used to modulate the frequency of the VCO. There are two
dedicated registers, EXT_MOD and FMOD, which can be used to configure the device as a modulator. It is possible to modulate
the VCO in two ways:
1.Binary FSK
The MODSETUP bits in the EXT_MOD register are set to 11. GPO3 is then configured as an input and used to control the signal
frequency. The frequency deviation is set by the MODSTEP and MODULATION bits in the EXT_MOD and FMOD registers respec-
tively.
The modulation frequency is calculated according to the following formula:
Where MODULATION is a 2's complement number and FPD is the phase detector frequency.
2.Continuous Modulation
The MODSETUP bits in the EXT_MOD register are set to 01. The frequency deviation is set by the MODSTEP and MODULATION
bits in the EXT_MOD and FMOD registers respectively. The VCO frequency is then changed by writing a new value into the MOD-
ULATION bits, the VCO frequency is instantly updated. An arbitrary frequency modulation can then be performed dependant
only on the rate at which values are written into the FMOD register.
The modulation frequency is calculated according to the following formula:
Where MODULATION is a 2's complement number and FPD is the phase detector frequency.
Programming Information
The RFFC2071A and RFFC2072A share a common serial interface and control block. Please refer to the register map and pro-
gramming guides which are available for download from http://rfmd.com/products/IntSynthMixer/.
Evaluation Boards
Evaluation boards for RFFC2071A and RFFC2072A are provided as part of a design kit, along with the necessary cables and
programming software tool to enable full evaluation of the device. The evaluation board has been configured for wideband
operation. The mixer inputs and outputs are connected to wideband transmission line transformer baluns. Design kits can be
ordered from www.rfmd.com or from local RFMD sales offices and authorized sales channels. For ordering codes please see
“Ordering Information” on page 22. For further details on how to set up the design kits please refer to the user guide which can
be downloaded from http://rfmd.com/products/IntSynthMixer/.
FMOD
2
MODSTEP F
PD
MODULATION
 2
16

=
FMOD
2
MODSTEP F
PD
MODULATION
 2
16

=


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