DSP56156 Motorola Inc, DSP56156 Datasheet - Page 73
DSP56156
Manufacturer Part Number
DSP56156
Description
16-bit Digital Signal Processor
Manufacturer
Motorola Inc
Datasheet
1.DSP56156.pdf
(76 pages)
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68
Design Considerations
Analog I/O Considerations
The output should be used differentially if at all possible. Analog signal traces should be
shielded by running traces connected to analog ground next to them. Unused board area on
both interconnect levels should be copper filled and connected to analog ground. The copper
fill is only shown on this page for clarity and simplicity. The ADC input anti-aliasing should
be done with respect to VREF.
Figure 49 presents four options for good power supply connections.
47 k
SPK OUT
47 k
Figure 48 Suggested Bottom Layer Routing
Freescale Semiconductor, Inc.
47 k
47 k
For More Information On This Product,
DSP56156 Data Sheet
Copper Fill of unused board space
should be connected to the analog ground plane.
Go to: www.freescale.com
BIAS
AUX
MIC
28
1nF
5.6 k
0.25 F
MIC IN
MOTOROLA
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