Si4721 datasheet(45/164 Pages) SILABS

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Si47xx-EVB

Rev. 0.8

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

Devices

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

All

Maximum Line Input

Level (mVpk)

The maximum line input level of the max audio input

signal that the user supplies to the device. This num-

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.

0–Line Input Attenu-

ation

All

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

All

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