User guide

DS900F1 14

CS4244

ADC DIGITAL FILTER CHARACTERISTICS

Test Conditions (unless otherwise specified): Device configured as shown in Section 2. on page 7. Input sine

wave: 1 kHz; VA_SEL = 0 for VA = 3.3 VDC, 1 for VA = 5.0 VDC.; Measurement Bandwidth is 20 Hz to 20 kHz

unless otherwise specified. See filter plots in Section 7. on page 59.

Note:

15. Response is clock-dependent and will scale with Fs.

16. The ADC group delay is measured from the time the analog inputs are sampled on the AINx pins to

the FS/LRCK transition (rising or falling) after the last bit of that (group of) sample(s) has been

transmitted on SDOUTx.

17. The amount of time from input of half-full-scale step function until the filter output settles to 0.1% of

full scale.

Parameter (Note 15) Min Typ Max Unit

Passband (Frequency Response) to -0.1 dB corner 0 - 0.4535 Fs

Passband Ripple -0.09 - 0.17 dB

Stopband 0.6 - - Fs

Stopband Attenuation 70 - - dB

Single-Speed Mode

ADC Group Delay (Note 16) - 9.5/Fs - s

High-Pass Filter Characteristics (48 kHz Fs)

Frequency Response -3.0 dB

-0.13 dB

Phase Deviation @ 20 Hz - 10 - Deg

Passband Ripple -0.09 - 0.17 dB

Filter Settling Time (Note 17) -

25000/Fs

Double-Speed Mode

ADC Group Delay (Note 16) - 9.5/Fs - s

High-Pass Filter Characteristics (96 kHz Fs)

Frequency Response -3.0 dB

-0.13 dB

Phase Deviation @ 20 Hz - 10 - Deg

Passband Ripple -0.15 - 0.17 dB

Filter Settling Time (Note 17)

25000/Fs