CS4385(2004) 데이터 시트보기 (PDF) - Cirrus Logic

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CS4385
(Rev.:2004)

114 dB, 192 kHz 8-Channel D/A Converter

Cirrus Logic 

CS4385

3.9.1 Capacitor Placement

Decoupling capacitors should be placed as close to the DAC as possible, with the low val-

ue ceramic capacitor being the closest. To further minimize impedance, these capacitors

should be located on the same layer as the DAC. If desired, all supply pins with similar

voltage ratings may be connected to the same supply, but a decoupling capacitor should

still be placed on each supply pin.

Note: All decoupling capacitors should be referenced to analog ground.

The CDB4385 evaluation board demonstrates the optimum layout and power supply ar-

rangements.

3.10 Analog Output and Filtering

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

ond-order Butterworth filter and differential to single-ended converter which was implemented on

the CS4385 evaluation board, CDB4385 Evaluation Board, as seen in Figure 24. The CS4385

does not include phase or amplitude compensation for an external filter. Therefore, the DAC sys-

tem 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 23 shows how the full-scale differential analog output level specification is derived.

AOUT+

3.85 V

2.5 V

1.15 V

AOUT-

3.85 V

2.5 V

1.15 V

Full-Scale Output Level= (AOUT+) - (AOUT-)= 6.7 Vpp

Figure 23. Full-Scale Output

DS671A1

27

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