CS4237B datasheet(95/114 Pages) CIRRUS

Part #	CS4237B

Description	CrystalClear Advanced Audio System with 3D Sound

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Manufacturer	CIRRUS [Cirrus Logic]

Direct Link	http://www.cirrus.com

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ferrite bead to the VD1 supply as shown in the

Reference Design Data Sheet. These pins must

be connected to a 5V supply.

VA provides power to the sensitive analog sec-

tions of the chip and should have a clean,

regulated supply to minimize power supply cou-

pled noise in the analog inputs and outputs.

ADC/DAC FILTER RESPONSE PLOTS

Figures 34 through 39 show the overall fre-

quency response, passband ripple, and transition

band for the ADCs and DACs. Figure 40 shows

the DACs’ deviation from linear phase. Since the

filter response scales based on sample frequency

selected, all frequency response plots x-axis are

shown from 0 to 1, where 1 is equivalent to Fs.

Therefore, for any given sample frequency, mul-

tiply the x-axis values by the sample frequency

selected to get the actual frequency.

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

0.00.10.20.30.40.50.60.70.8

0.91.0

Input Frequency ( x Fs)

Figure 34. ADC Filter Response

0.2

0.1

0.0

-0.1

-0.2

-0.3

-0.4

-0.5

-0.6

-0.7

-0.8

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.350.40

0.45

0.50

Input Frequency ( x Fs)

Figure 35. ADC Passband Ripple

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

0

.40

0

.45

0

.50

0

.55

0

.60

0

.65

0

.70

Input Frequency ( x Fs)

Figure 36. ADC Transition Band

DS213PP4

CS4237B

95

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CS4237B Datasheet(PDF) 95 Page - Cirrus Logic

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