CS4207-DNZ View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS4207-DNZ

Low-power, 4-in / 6-out HD Audio Codec with Headphone Amp

Cirrus Logic 

CS4207

For an improvement from using the single-ended circuitry, both analog stereo input pairs may be configured

in a pseudo-differential topology. This provides common-mode noise rejection for single-ended inputs by

differentially routing LINEIN_C-, MICIN_L-, and/or MICIN_R- with the signal traces. See Figure 12 for the

recommended pseudo-differential input filter.

Left Analog Input 1 //

(differential trac es )

GND

//

(differential trac es )

Right Analog Input 1 //

Left Analog Input 2 //

(differential trac es )

GND

//

GND

//

(differential trac es )

Right Analog Input 2 //

100 k

100 k

100  **

100  1 µF **

100  ** 1 µF

1 µF

Note 1

* 1800 pF

*

1800 pF

LINEIN_L+

LINEIN_C-

LINEIN_R+

100 k

100 k

100  **

100  1 µF **

100 

1 µF

**

1 µF

100  **

1 µF

* 1800 pF

MICIN_L+

MICIN_L-

*

1800 pF

MICIN_R-

MICIN_R+

CS4207

+

PGA

-

-

PGA

+

common mode rejection at input of PGA

reduces external system noise

+

PGA

-

-

PGA

+

* NPO/C0G dielectric capacitors.

** Low ESR, X7R/X5R dielectric capacitors.

Note:

1. These capacitors serve as a charge reservoir for the internal switched capacitor ADC

modulators and should be placed as close as possible to the inputs.

Figure 12. Pseudo-Differential Input Filter

AGND

140

DS880F4

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