Datasheet

VS1053b Datasheet
11 VS1053B REGISTERS
11.17 Sidestream Sigma-Delta Modulator (SDM)
The Sidestream Sigma-Delta Modulator makes it possible to insert a digital side stream on top
of existing audio.
Note: The SDM provides a direct, low-delay side channel to the Sigma-Delta DACs of VS10xx.
It makes no attempts at low-pass filtering data. Thus there will be practically no image rejection.
If using low samplerates, this may cause audible aliasing distortion.
Sidestream SDM registers, prefix SDM_
Reg Type Reset Abbrev[bits] Description
0xC049 rw 0 CONTROL[12:0] SDM control
0xC04A rw 0 DATA_LEFT SDM left channel data
0xC04B rw 0 DATA_RIGHT SDM right channel data
SDM_CONTROL Bits
Name Bits Description
SDM_ENABLE 12 Set to enable SDM
SDM_DIV 11:0 Set samplerate to XTALI/2/(SDM_DIV+1)
Each time a new (stereo) sample is needed, an SDM interrupt is generated.
Version: 1.22, 2014-12-19 85