CS42516 datasheet(73/90 Pages) CIRRUS

73 / 90 page

DS583F1

CS42516

8. APPENDIX A: EXTERNAL FILTERS

8.1

ADC Input Filter

The analog modulator samples the input at 6.144 MHz (internal MCLK=12.288 MHz). The digital filter will

reject signals within the stopband of the filter. However, there is no rejection for input signals which are

× 6.144 MHz) the digital passband frequency, where n=0,1,2,... Refer to Figure 24 for a recommended

analog input buffer that will attenuate any noise energy at 6.144 MHz, in addition to providing the optimum

source impedance for the modulators. The use of capacitors that have a large voltage coefficient (such as

general-purpose ceramics) must be avoided since these can degrade signal linearity.

8.2

DAC Output Filter

The CS42516 is a linear phase design and does not include phase or amplitude compensation for an exter-

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

alog circuitry.

100

µF

100 k

Ω

10 k

Ω

3.32 k

Ω

2.8 k

Ω

0.1

µF

100

µF

470 pF

C0G

634

Ω

634

Ω

634

Ω

2700 pF

C0G

A INL1+

A INL1-

AINR1+

AINR1-

100

µF

100 k

Ω

10 k

Ω

3.32 k

Ω

2.8 k

Ω

0.1

µF

100

µF

470 pF

C0G

634

Ω

634

Ω

634

Ω

2700 pF

C0G

332

Ω

332

Ω

Figure 24. Recommended Analog Input Buffer

AINL

AINR

AOUT +

AOUT -

390 pF

C0G

1 k

Ω

µF

6.19 k

Ω

1800 pF

C0G

887

Ω

2.94 k

Ω

5.49 k

Ω

1.65 k

Ω

1.87 k

Ω

µF

1200 pF

C0G

5800 pF

C0G

47.5 k

Ω

Analog

Out

Figure 25. Recommended Analog Output Buffer

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