RF2052TR7 RFMD, RF2052TR7 Datasheet - Page 20

• Manufacturer Part Number: RF2052TR7
• Description: IC RF MIXER PLL/VCO 32-QFN
• Manufacturer: RFMD

Specifications of RF2052TR7

• Rf Type: UHF, VHF
• Frequency: 30MHz ~ 2.5GHz
• Number Of Mixers: 1
• Gain: -2dB
• Noise Figure: 12dB
• Secondary Attributes: Up/Down Converter
• Current - Supply: 75mA
• Voltage - Supply: 2.7 V ~ 3.6 V
• Package / Case: 32-VFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 689-1089-2

RF2052
Setting The Operating Frequency
Setting the operating frequency of the device requires a number of registers to be programmed.
A total of four registers must be programmed to set the device operating frequency. This will take 5.2us for each path at maxi-
mum clock speed.
To change the frequency of the VCO it will be necessary to repeat these operations. However, if the frequency shift is small it
may not be necessary to reprogram the VCOSEL and LODIV bits reducing the register writes to three.
For an example on how to determine the integer and fractional parts of the synthesizer PLL division ratio please refer to the
detailed description of the PLL on page 11.
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P2_VCOSEL and
P2_NUM_MSB
P2_NUM_LSB,
Set operating
programmed
frequencies
P2_CT_DEF
Frequency
P2_LODIV
Program
Program
Program
Program
P2_N
When programming the operating frequency it is
necessary to select the appropriate VCO and LODIV
values. The P2_VCOSEL and P2_LODIV bits are
located in the PLL2x0 register.
If the LO frequency is above 2GHz the LO path current
(CFG5) should be set to 0xC
The integer part of the PLL division ratio is
programmed into the PLL2x3 register.
The MSB of the fractional part of the synthesizer PLL
divider value is programmed into the PLL2x1 register.
The LSB of the fractional part of the synthesizer PLL
divider value is programmed into the PLL2x2 register
together with the CT_CAL bits if fast frequency
switching is required.
(Depending on required frequency resolution and
coarse tune settings this may not be required.)
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DS100630