User guide

12 DS686F1

CS4270

ADC DIGITAL FILTER CHARACTERISTICS

Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. (Note 9)

Notes: 9. Plots of this data are contained in Section 9. “Filter Plots” on page 38. See Figures 23 through 46.

10. The filter frequency response scales precisely with Fs.

11. Response shown is for Fs equal to 48 kHz. Filter characteristics scale with Fs.

Parameter Symbol Min Typ Max Unit

Single-Speed Mode

Passband (-0.1 dB) (Note 10) 0-0.49Fs

Passband Ripple - - 0.035 dB

Stopband (Note 10) 0.57 - - Fs

Stopband Attenuation 70 - - dB

Group Delay t

- 12/Fs - s

Double-Speed Mode

Passband (-0.1 dB) (Note 10) 0-0.49Fs

Passband Ripple - - 0.05 dB

Stopband (Note 10) 0.56 - - Fs

Stopband Attenuation 69 - - dB

Group Delay t

-9/Fs- s

Quad-Speed Mode

Passband (-0.1 dB) (Note 10) 0-0.26Fs

Passband Ripple - - 0.05 dB

Stopband (Note 10) 0.50 - - Fs

Stopband Attenuation 60 - - dB

Group Delay t

-5/Fs- s

High-Pass Filter Characteristics

Frequency Response -3.0 dB

-0.13 dB (Note 11)

Phase Deviation @ 20 Hz (Note 11) - 10 - deg

Passband Ripple --0dB