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Si4355
3.4.1. Synthesizer Frequency Control
The frequency is set by changing the integer and fractional settings to the synthesizer. The WDS calculator will
automatically provide these settings, but the synthesizer equation is shown below for convenience. Initial
frequency settings are configured in the EZConfig setup and can also be modified using the API commands:
FREQ_CONTROL_INTE, FREQ_CONTROL_FRAC2,
FREQ_CONTROL_FRAC1, and
RF_channel = ? ? fc_inte + ------------------ ? ? ? ------------------------------- ? Hz ?
outdiv
2
FREQ_CONTROL_FRAC0.
fc_frac 4 ? freq_xo
19
Note: The fc_frac/2 19 value in the above formula must be a number between 1 and 2. The LSB of fc_frac must be "1".
Table 9. Output Divider (Outdiv) Values
Outdiv
12
8
4
Lower (MHz)
284
425
850
Upper (MHz)
350
525
960
3.4.1.1. EZ Frequency Programming
EZ frequency programming allows for easily changing radio frequency using a single API command. The base
frequency is first set using the EZConfig setup. This base frequency will correspond to channel 0. Next, a channel
step size is also programmed within the EZConfig setup. The resulting frequency will be:
RF Frequency = Base Frequency + Channel ? Step Size
The second argument of the START_RX is CHANNEL, which sets the channel number for EZ frequency
programming. For example, if the channel step size is set to 1 MHz, the base frequency is set to 900 MHz, and a
CHANNEL number of 5 is programmed during the START_RX command, the resulting frequency will be 905 MHz.
If no CHANNEL argument is written as part of the START_RX command, it will default to the previous value. The
initial value of CHANNEL is 0 and so will be set to the base frequency if this argument is never used.
3.5. Crystal Oscillator
The Si4355 includes an integrated crystal oscillator with a fast start-up time of less than 250 μs. The design is
differential with the required crystal load capacitance integrated on-chip to minimize the number of external
components. By default, all that is required off-chip is the crystal. The default crystal is 30 MHz, but the circuit is
designed to handle any XTAL from 25 to 32 MHz, set in the EZConfig setup. The crystal load capacitance can be
digitally programmed to accommodate crystals with various load capacitance requirements and to adjust the
frequency of the crystal oscillator. The tuning of the crystal load capacitance is programmed through the
GLOBAL_XO_TUNE API property. The total internal capacitance is 11 pF and is adjustable in 127 steps (70
fF/step). The crystal frequency adjustment can be used to compensate for crystal production tolerances. The
frequency offset characteristics of the capacitor bank are demonstrated in Figure 3.
Rev 1.0
13
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