CS4245 datasheet(11/57 Pages) CIRRUS

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DS656F2

CS4245

6. Guaranteed by design. See Figure 2. RL and CL reflect the recommended minimum resistance and

maximum capacitance required for the internal op-amp’s stability. CL affects the dominant pole of the

internal output amp; increasing CL beyond 100 pF can cause the internal op-amp to become unstable.

DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE

7. Filter response is guaranteed by design.

8. For Single-Speed Mode, the Measurement Bandwidth is 0.5465 Fs to 3 Fs.

For Double-Speed Mode, the Measurement Bandwidth is 0.577 Fs to 1.4 Fs.

For Quad-Speed Mode, the Measurement Bandwidth is 0.7 Fs to 1 Fs.

9. De-emphasis is available only in Single-Speed Mode.

10. Response is clock dependent and will scale with Fs. Note that the amplitude vs. frequency plots of this

data (Figures 21 to 30) have been normalized to Fs and can be de-normalized by multiplying the X-axis

scale by Fs.

Parameter (Note 7,10)

Symbol

Min

Typ

Max

Unit

Combined Digital and On-chip Analog Filter Response

Single-Speed Mode

Passband (Note 7)

to -0.1 dB corner

to -3 dB corner

0.35

0.4992

Frequency Response 10 Hz to 20 kHz

-0.175

+0.01

StopBand

0.5465

StopBand Attenuation

(Note 8)

Group Delay

tgd

10/Fs

De-emphasis Error (Note 9)

Fs = 44.1 kHz

+0.05/-0.25

Combined Digital and On-chip Analog Filter Response

Double-Speed Mode

Passband (Note 7)

to -0.1 dB corner

to -3 dB corner

0.22

0.501

Frequency Response 10 Hz to 20 kHz

-0.15

+0.15

StopBand

0.5770

StopBand Attenuation

(Note 8)

Group Delay

tgd

5/Fs

Combined Digital and On-chip Analog Filter Response

Quad-Speed Mode

Passband (Note 7)

to -0.1 dB corner

to -3 dB corner

0.110

0.469

Frequency Response 10 Hz to 20 kHz

-0.12

StopBand

0.7

StopBand Attenuation

(Note 8)

Group Delay

tgd

2.5/Fs

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