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CDB4350 数据表(PDF) 4 Page - Cirrus Logic |
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CDB4350 数据表(HTML) 4 Page - Cirrus Logic |
4 / 16 page 4 DS691DB1 CDB4350 6. POWER SUPPLY CIRCUITRY Power is supplied to the evaluation board by three binding posts (GND, +12V, and -12V), as shown in Figure 7. The ‘+12V’ and ‘-12V’ terminals supply the active output filters. The +3.3 V and +5.0 V circuitry is powered by regulators fed by the ‘+12V’ terminal. Headers J3, J4, and J7 allow the user to either select +3.3 V or +5.0 V supplies for the various CS4350 voltage supply pins. Alternatively, the user can remove the shunts on J3, J4, and J7, and provide an external power supply. WARNING: Refer to the CS4350 datasheet for maximum allowable voltage levels. Operation outside of this range can cause permanent damage to the device. 7. GROUNDING AND POWER SUPPLY DECOUPLING As with any high-performance converter, the CS4350 requires careful attention to power supply and grounding ar- rangements in order to optimize performance. Figure 2 details the connections to the CS4350 while Figures 8, 9, and 10 show the component placement and top and bottom layout. The decoupling capacitors are located as close to the CS4350 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in ra- diated noise. 8. ANALOG OUTPUT FILTERING The analog output on the CDB4350 has been designed according to the CS4350 datasheet. This output circuit in- cludes an active 2-pole, 50 kHz filter which utilizes the multiple-feedback topology and a passive output filter. |
类似零件编号 - CDB4350 |
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类似说明 - CDB4350 |
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