User Manual
Table Of Contents
- 1. Pin Description
- 2. Characteristics and Specifications
- Recommended Operating Conditions
- Absolute Maximum Ratings
- DAC Analog Characteristics
- Power and Thermal Characteristics
- Combined Interpolation & On-Chip Analog Filter Response
- Combined Interpolation & On-Chip Analog Filter Response
- DSD Combined Digital & On-Chip Analog Filter Response
- Digital Characteristics
- Switching Characteristics - PCM
- Switching Characteristics - DSD
- Switching Characteristics - Control Port - I·C Format
- Switching Characteristics - Control Port - SPI Format
- 3. Typical Connection Diagram
- 4. Applications
- 4.1 Master Clock
- 4.2 Mode Select
- 4.3 Digital Interface Formats
- Figure 8. Format 0 - Left-Justified up to 24-bit Data
- Figure 9. Format 1 - I·S up to 24-bit Data
- Figure 10. Format 2 - Right-Justified 16-bit Data
- Figure 11. Format 3 - Right-Justified 24-bit Data
- Figure 12. Format 4 - Right-Justified 20-bit Data
- Figure 13. Format 5 - Right-Justified 18-bit Data
- 4.3.1 OLM #1
- 4.3.2 OLM #2
- 4.4 Oversampling Modes
- 4.5 Interpolation Filter
- 4.6 De-Emphasis
- 4.7 ATAPI Specification
- 4.8 Direct Stream Digital (DSD) Mode
- 4.9 Grounding and Power Supply Arrangements
- 4.10 Analog Output and Filtering
- 4.11 The MUTEC Outputs
- 4.12 Recommended Power-Up Sequence
- 4.13 Recommended Procedure for Switching Operational Modes
- 4.14 Control Port Interface
- 4.15 Memory Address Pointer (MAP)
- 5. Register Quick Reference
- 6. Register Description
- 6.1 Chip Revision (Address 01h)
- 6.2 Mode Control 1 (Address 02h)
- 6.3 PCM Control (Address 03h)
- 6.4 DSD Control (Address 04h)
- 6.5 Filter Control (Address 05h)
- 6.6 Invert Control (Address 06h)
- 6.7 Group Control (Address 07h)
- 6.8 Ramp and Mute (Address 08h)
- 6.9 Mute Control (Address 09h)
- 6.10 Mixing Control (Address 0Ah, 0Dh, 10h, 13h)
- 6.11 Volume Control (Address 0Bh, 0Ch, 0Eh, 0Fh, 11h, 12h)
- 6.12 PCM Clock Mode (Address 16h)
- 7. Filter Response Plots
- Figure 24. Single-Speed (fast) Stopband Rejection
- Figure 25. Single-Speed (fast) Transition Band
- Figure 26. Single-Speed (fast) Transition Band (detail)
- Figure 27. Single-Speed (fast) Passband Ripple
- Figure 28. Single-Speed (slow) Stopband Rejection
- Figure 29. Single-Speed (slow) Transition Band
- Figure 30. Single-Speed (slow) Transition Band (detail)
- Figure 31. Single-Speed (slow) Passband Ripple
- Figure 32. Double-Speed (fast) Stopband Rejection
- Figure 33. Double-Speed (fast) Transition Band
- Figure 34. Double-Speed (fast) Transition Band (detail)
- Figure 35. Double-Speed (fast) Passband Ripple
- Figure 36. Double-Speed (slow) Stopband Rejection
- Figure 37. Double-Speed (slow) Transition Band
- Figure 38. Double-Speed (slow) Transition Band (detail)
- Figure 39. Double-Speed (slow) Passband Ripple
- Figure 40. Quad-Speed (fast) Stopband Rejection
- Figure 41. Quad-Speed (fast) Transition Band
- Figure 42. Quad-Speed (fast) Transition Band (detail)
- Figure 43. Quad-Speed (fast) Passband Ripple
- Figure 44. Quad-Speed (slow) Stopband Rejection
- Figure 45. Quad-Speed (slow) Transition Band
- Figure 46. Quad-Speed (slow) Transition Band (detail)
- Figure 47. Quad-Speed (slow) Passband Ripple
- 8. References
- 9. Parameter Definitions
- 10. Package Dimensions
- 11. Ordering Information
- 12. Revision History
24 DS619F1
CS4364
4.5 Interpolation Filter
To accommodate the increasingly complex requirements of digital audio systems, the CS4364 incorporates
selectable interpolation filters for each mode of operation. A “fast” and a “slow” roll-off filter is available in
each of Single-, Double-, or Quad-Speed Modes. These filters have been designed to accommodate a va-
riety of musical tastes and styles. The FILT_SEL bit is used to select which filter is used (see the “Parameter
Definitions” on page 47 for more details).
When in Hardware Mode, only the “fast” roll-off filter is available.
Filter specifications can be found in Section 2, and filter response plots can be found in Figures 24 to 47.
4.6 De-Emphasis
The CS4364 includes on-chip digital de-emphasis filters. The de-emphasis feature is included to accommo-
date older audio recordings that utilize pre-emphasis equalization as a means of noise reduction. Figure 16
shows the de-emphasis curve. The frequency response of the de-emphasis curve will scale proportionally
with changes in sample rate, Fs if the input sample rate does not match the coefficient which has been se-
lected.
In Software Mode the required de-emphasis filter coefficients for 32 kHz, 44.1 kHz, or 48 kHz are selected
via the de-emphasis control bits.
In Hardware Mode only the 44.1 kHz coefficient is available (enabled through the M2 pin). If the input sam-
ple rate is not 44.1 kHz and de-emphasis has been selected then the corner frequencies of the de-emphasis
filter will be scaled by a factor of the actual Fs over 44,100.
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1 F2
3.183 kHz 10.61 kHz
Figure 16. De-Emphasis Curve