Datenblatt-Suchmaschine für elektronische Bauteile |
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CDB4339 Datenblatt(PDF) 3 Page - Cirrus Logic |
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CDB4339 Datenblatt(HTML) 3 Page - Cirrus Logic |
3 / 14 page CDB4334/8/9 DS248DB2 25 ANALOG OUTPUT FILTER The evaluation board includes a pair of single pole passive filters and a pair of 3-pole active filters. The passive filters are provided as an example for cost-sensitive desigins. The active filters demon- strate a higher performance alternative with better out-of-band noise rejection. The passive filters, Fig. 4, have a corner frequency of approximately 95 kHz with JP3 and JP6 installed and 190 kHz without JP3 and JP6. The 3-pole active filters are shown in Fig. 3. The output filter options are se- lected via the Left and Right Channel filter jump- ers, Fig. 2. INPUT/OUTPUT FOR CLOCKS AND DATA The evaluation board has been designed to allow the interface to external systems via the 10-pin header, J9. This header allows the evaluation board to accept externally generated clocks and data. The schematic for the clock/data I/O is shown in Figure 10. The 74HC243 transceiver functions as an I/O buffer where jumpers HDR1-HDR6 deter- mine if the transceiver operates as a transmitter or receiver. A transmit function is implemented with the HDR1-HDR6 jumpers in the 8414 position. LRCK, SDATA, and SCLK from the CS8414 will be outputs on J9. The transceiver operates as a re- ceiver with jumpers HDR1-HDR6 in the EXTER- NAL position. MCLK, LRCK, SDATA and SCLK on J9 become inputs. GROUNDING AND POWER SUPPLY DECOUPLING The CS4334/8/9 requires careful attention to power supply and grounding arrangements to optimize performance. Figure 9 shows CDB power arrange- ments. The CDB4334/8/9 ground plane is divided in a manner to control to digital return currents in order to minimize noise. The decoupling capacitors are located as close to the CS4334/8/9 as possible. Extensive use of ground plane fill on both the ana- log and digital sections of the evaluation board yield large reductions in radiated noise effects. |
Ähnliche Teilenummer - CDB4339 |
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Ähnliche Beschreibung - CDB4339 |
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