DSP56156 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

DSP56156

16-bit Digital Signal Processor

Motorola => Freescale 

Design Considerations

Analog I/O Considerations

Freescale Semiconductor, Inc.

47 kΩ

BIAS

AUX

MIC

28 1nF

0.25 µF

MIC IN

5.6 kΩ

47 kΩ

47 kΩ

Copper Fill of unused board space

should be connected to the analog ground plane.

47 kΩ

SPK OUT

Figure 48 Suggested Bottom Layer Routing

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.

68

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Go to: www.freescale.com

MOTOROLA

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