Texas Instruments PCM1681, User Manual

Page: 4 / 41

Submit Documentation Feedback
List of Figures
www.ti.com
1-1 DEM-DAI1681 Functional Block Diagram .......................................................................................................... 10
1-2 Jumper JP001 .................................................................................................................................................... 11
2-1 Demonstration Software Window ....................................................................................................................... 17
2-2 Attenuation Control ............................................................................................................................................. 18
2-3 Operation Control ............................................................................................................................................... 18
2-4 Function Control ................................................................................................................................................. 18
3-1 PCM1681 Performance vs f
S
(Sampling Rate) and f
SYS
(System Clock)............................................................ 22
3-2 THD+N vs Input Level ........................................................................................................................................ 23
3-3 FFT (0 dB) .......................................................................................................................................................... 23
3-4 FFT (–60 dB) ...................................................................................................................................................... 24
3-5 FFT (–90 dB) ...................................................................................................................................................... 24
3-6 FFT (BPZ) .......................................................................................................................................................... 25
3-7 Out-of-Band Noise vs System Clock and Oversampling Condition .................................................................... 25
4-1 Low-Pass Filter Schematic ................................................................................................................................. 28
4-2 Daughtercard Sockets, Connector, and Regulator Schematic ........................................................................... 29
4-3 Digital Audio Interface Schematic ...................................................................................................................... 30
4-4 PCM1681 Daughtercard Schematic ................................................................................................................... 31
4-5 DEM-DAI/MDAC Board Layout—Silkscreen ...................................................................................................... 32
4-6 DEM-DAI/MDAC Board Layout—Top (Component) Side .................................................................................. 33
4-7 DEM-DAI/MDAC Board Layout—Bottom View ................................................................................................... 34
4-8 DEM-PCM1681 Board Layout—Silkscreen ........................................................................................................ 35
4-9 DEM-PCM1681 Board Layout—Top (Component) Side .................................................................................... 35
4-10 DEM-PCM1681 Board Layout—Bottom View .................................................................................................... 36
4
List of Figures
SBAU137 – April 2008