Datasheet

Figure 47-9. Interpolator Spectral Mask for 16x OSR
0 1*f
s
2*f
s
3*f
s
4*f
s
5*f
s
6*f
s
7*f
s
8*f
s
-120
-96
-72
-48
-24
0
frequency (Hz), overall mask
gain (dB), overall mask
3rd order SINC filter overall mask for OSR = 16
0 f
s
/16 f
s
/8 3*f
s
/16 f
s
/4 5*f
s
/16 3*f
s
/8 7*f
s
/16 f
s
/2
-12
-9.6
-7.2
-4.8
-2.4
0
frequency (Hz), 0–f
s
/2 mask
gain (dB), 0–f
s
/2 mask
3rd order SINC filter 0–f
s
/2 mask for OSR = 16
Figure 47-10. Interpolator Spectral Mask for 32x OSR
0 2*f
s
4*f
s
6*f
s
8*f
s
10*f
s
12*f
s
14*f
s
16*f
s
-120
-96
-72
-48
-24
0
frequency (Hz), overall mask
gain (dB), overall mask
3rd order SINC filter overall mask for OSR = 32
0 f
s
/16 f
s
/8 3*f
s
/16 f
s
/4 5*f
s
/16 3*f
s
/8 7*f
s
/16 f
s
/2
-12
-9.6
-7.2
-4.8
-2.4
0
frequency (Hz), 0–f
s
/2 mask
gain (dB), 0–f
s
/2 mask
3rd order SINC filter 0–f
s
/2 mask for OSR = 32
47.6.9.7 Dithering-Interpolation Mode
It is possible to enable both Dithering and Interpolation at the same time by setting DACCTRLx.DITHER
and DACCTRLx.OSR prior to enabling the DAC. In Dithering-Interpolation mode, the output of dithering is
sampled at a number of events corresponding to the OSR value. The valid OSR value is 2, 4, 8, or 16.
Figure 47-11. Dithering-Interpolation Data Path
data/N-events
data/event
16bit
16bit
16bit
12bit
SINC
DITHER
1
0
DAC
DACCTRL.FEXT
data/16-events
APB
DAC Controller
DATABUF
SAM D5x/E5x Family Data Sheet
DAC – Digital-to-Analog Converter
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 1683