User guide

10 DS686F1
CS4270
DAC COMBINED INTERPOLATION & ANALOG FILTER RESPONSE
The filter characteristics have been normalized to the sample rate (Fs) and can be referenced to the desired sam-
ple rate by multiplying the given characteristic by Fs. (See Note 4)
Notes: 4. Amplitude vs. Frequency plots of this data are available in Section 9. “Filter Plots” on page 38. See
Figures 23 through 46.
5. Response is clock dependent and will scale with Fs.
6. 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.
7. De-emphasis is available only in Single-Speed Mode.
Parameter Symbol Min Typ Max Unit
Single-Speed Mode
Passband (Note 5) to -0.1 dB corner
to -3 dB corner
0
0
-
-
.35
.4992
Fs
Fs
Frequency Response 10 Hz to 20 kHz -.175 - +.01 dB
StopBand .5465 - - Fs
StopBand Attenuation (Note 6) 50 - - dB
Group Delay tgd - 10/Fs - s
De-emphasis Error (Note 8) Fs = 32 kHz
Fs = 44.1 kHz
Fs = 48 kHz
-
-
-
-
-
-
+1.5/+0
+.05/-.25
-.2/-.4
dB
dB
dB
Double-Speed Mode
Passband (Note 5) to -0.1 dB corner
to -3 dB corner
0
0
-
-
.22
.501
Fs
Fs
Frequency Response 10 Hz to 20 kHz -.15 - +.15 dB
StopBand .5770 - - Fs
StopBand Attenuation (Note 6) 55 - - dB
Group Delay tgd - 5/Fs - s
Quad-Speed Mode
Passband (Note 5) to -0.1 dB corner
to -3 dB corner
0
0
-
-
0.110
0.469
Fs
Fs
Frequency Response 10 Hz to 20 kHz -.12 - +0 dB
StopBand 0.7 - - Fs
StopBand Attenuation (Note 6) 51 - - dB
Group Delay tgd - 2.5/Fs - s