User Manual

DS656F3 11

CS4245

6. Guaranteed by design. See Figure 2. R

and C

reflect the recommended minimum resistance and

maximum capacitance required for the internal op-amp’s stability. C

affects the dominant pole of the

internal output amp; increasing C

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 dB

StopBand 0.5465 - - Fs

StopBand Attenuation (Note 8) 50 - - dB

Group Delay tgd - 10/Fs - s

De-emphasis Error (Note 9) Fs = 44.1 kHz - - +0.05/-0.25 dB

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 dB

StopBand 0.5770 - - Fs

StopBand Attenuation (Note 8) 55 - - dB

Group Delay tgd - 5/Fs - s

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 - 0 dB

StopBand 0.7 - - Fs

StopBand Attenuation (Note 8) 51 - - dB

Group Delay tgd - 2.5/Fs - s