User guide

Si471x-EVB
22 Preliminary Rev. 0.4
Audio Level High
Threshold (dBFS)
Set the threshold in which an interrupt will be generated when the audio
input level rises above this threshold for the duration greater than the Audio
Level High Duration setting. This may also be called loud detection indicator.
–70 to 0
Audio Level High
Duration (mSec)
Set the duration for the audio level high before an interrupt is generated.
0–65535
Line Input
Attenuation
The Si471x chip has 4 attenuator setting (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 chip.
190 mVp,
301 mVpk,
416 mVp,
636 mVpk
Maximum Line
Input Level
The maximum line input level is like a fine adjustment of the max audio input
signal that the user supply to the chip. This number has to be less than or
equal to the attenuation setting. 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, other-
wise the audio signal will become distorted.
0–636 mVpk
Table 3. Analog Property Window Explanations (Continued)
Item Explanation Range