Datasheet

VS1053b Datasheet
9 OPERATION
volume (SCI_VOL), and samplerate (SCI_AUDATA) can be set before or during the test. Write
0x4020 to SCI_AIADDR to start the test.
SCI_AICTRLn can be calculated from the desired frequency and DAC samplerate by:
SCI_AICTRLn = F
sin
× 65536/F
s
The maximum value for SCI_AICTRLn is 0x8000U. For the best S/N ratio for the generated
sine, three LSb’s of the SCI_AICTRLn should be zero. The resulting frequencies F
sin
can be
calculated from the DAC samplerate F
s
and SCI_AICTRL0 / SCI_AICTRL1 using the following
equation.
F
sin
= SCI_AICTRLn × F
s
/65536
Sine sweep test can be started by writing 0x4022 to SCI_AIADDR.
Both these tests use the normal audio path, thus also SCI_BASS, differential output mode, and
EarSpeaker settings have an effect.
Version: 1.13, 2011-05-27 65