Cirrus Logic CS4265 - Manual (Page 38)

38 DS657F3
CS4265
6.3.3 De-Emphasis Control (Bit 1)
Function:
The standard 50/15 s digital de-emphasis filter response, Figure 17 , may be implemented for a sample
rate of 44.1 kHz when the DeEmph bit is configured as shown in Table 8 . NOTE: De-emphasis is available
only in Single-Speed Mode.
6.4 ADC Control - Address 04h
6.4.1 Functional Mode (Bits 7:6)
Function:
Selects the required range of sample rates.
6.4.2 ADC Digital Interface Format (Bit 4)
Function:
The required relationship between LRCK, SCLK and SDOUT is defined by the ADC Digital Interface For-
mat bit. The options are detailed in Table 10 and may be seen in Figure 5 and Figure 6 .
DeEmph Description
0 Disabled (default)
1 44.1 kHz de-emphasis
Table 8. De-Emphasis Control
7 6 5 4 3 2 1 0
FM1 FM0 Reserved ADC_DIF Reserved MuteADC HPFFreeze M/S
FM1 FM0 Mode
0 0 Single-Speed Mode: 4 to 50 kHz sample rates
0 1 Double-Speed Mode: 50 to 100 kHz sample rates
1 0 Quad-Speed Mode: 100 to 200 kHz sample rates
1 1 Reserved
Table 9. Functional Mode Selection
Gain
dB
-10dB
0dB
Frequency
T2 = 15 µs
T1=50 µs
F1 F2
3.183 kHz 10.61 kHz
Figure 17. De-Emphasis Curve