CS42416 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS42416

110 dB, 192 kHz 6-Ch Codec with PLL

Cirrus Logic 

8. APPENDIX A: EXTERNAL FILTERS

CS42416

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

(n × 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.

AINL

100 kΩ

634 Ω

100 µF

470 pF

C0G

-

+

VA

2.8 kΩ

10 kΩ

91 Ω

634 Ω

3.32 kΩ

0.1 µF

100 µF 332 Ω

634 Ω

470 pF

C0G

-

+

91 Ω

2700 pF

C0G

A INL1+

A INL1-

AINR

100 kΩ

634 Ω

100 µF

470 pF

C0G

-

+

VA

2.8 kΩ

10 kΩ

91 Ω

634 Ω

3.32 kΩ

0.1 µF

100 µF 332 Ω

634 Ω

470 pF

C0G

-

+

91 Ω

2700 pF

C0G

A INR1+

A INR1-

Figure 24. Recommended Analog Input Buffer

8.2 DAC Output Filter

The CS42416 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.

AOUT -

AOUT +

1800 pF

C0G

6.19 kΩ

390 pF

5.49 kΩ 2.94 kΩ

C0G

-

1.65 kΩ

5800 pF

887 Ω

C0G

1.87 kΩ

+

1200 pF

C0G

22 µF

22 µF 1 k Ω

47.5 k Ω

Analog

Out

Figure 25. Recommended Analog Output Buffer

DS602F1

61

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