Cirrus-logic CS4365 Instrukcja Użytkownika Pobierz pdf (Strona 28)

28 DS670F2

CS4365

4.10 Analog Output and Filtering

The application note “Design Notes for a 2-Pole Filter with Differential Input” discusses the second-order

Butterworth filter and differential to single-ended converter which was implemented on the CS4365 evalua-

tion board, CDB4365, as seen in Figure 20. The CS4365 does not include phase or amplitude compensa-

tion for an external filter. Therefore, the DAC system phase and amplitude response will be dependent on

the external analog circuitry. The off-chip filter has been designed to attenuate the typical full-scale output

level to below 2 Vrms.

Figure 19 shows how the full-scale differential analog output level specification is derived.

AOUT+

AOUT-

Full-Scale Output Level= (AOUT+) - (AOUT-)= 6.6 Vpp

4.15 V

2.5 V

0.85 V

4.15 V

2.5 V

0.85 V

Figure 19. Full-Scale Output

Figure 20. Recommended Output Filter

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Cirrus-logic CS4365 Instrukcja Użytkownika Strona 28