SI47XX-EVB Datasheet, PDF (45/164 Pages) Silicon Laboratories – Thank you for purchasing the Silicon Laboratories

Si47xx-EVB
5.5. FM Transmitter Settings (Analog Mode) Property Window
FM transmitter settings can be configured through the properties window by selecting WindowProperties.
Properties are grouped into categories which can be selected from the drop-down box in the upper right of the
window. For convenience, all FM transmitter properties are also located in WindowPropertiesTX: All. Analog
mode properties will be available if Analog Mode was selected in the initialization window.
Figure 39. FM Transmitter Settings in Analog Mode Property Window
Table 9. FM Transmitter Settings in Analog Mode Property Window Descriptions
Item
Description
Range
Line Input
Attenuation (k)
The Si47xx has four attenuator settings (636, 416,
301, and 190 mVp). It will tell the maximum audio
input signal that the user can give to the LIN and RIN
input. The attenuator setting will determine the audio
input impedance (LIN and RIN) of the device.
190 mVp,
301 mVpk,
416 mVp,
636 mVpk
Maximum Line Input The maximum line input level of the max audio input 0–Line Input Attenu-
Level (mVpk) signal that the user supplies to the device. This num-
ation
ber has to be less than or equal to the attenuation set-
ting. The max line input level will correspond to the
max audio deviation set in the audio deviation window
on the main GUI. Make sure that the actual audio
input signal does not exceed this limit, otherwise the
audio signal will become distorted.
Reference Clock
Frequency (Hz)
This field is used to specify the frequency of the
reference clock. The input to the RCLK pin divided by
the prescaler is the reference clock. The reference
clock must be in the range of 31130 to 34406 Hz.
31130–34406 Hz
Devices
All
All
All
Rev. 0.8
45