User Manual

44 DS656F3

CS4245

6.3.4 De-Emphasis Control (Bit 1)

Function:

The standard 50/15 s digital de-emphasis filter response, Figure 20, may be implemented for a sample

rate of 44.1 kHz when the DeEmph bit is configured as shown in Table 9. NOTE: De-emphasis is available

only in Single-Speed Mode.

6.3.5 DAC Master / Slave Mode (Bit 0)

Function:

This bit selects either master or slave operation for serial audio port 2. Setting this bit will select Master

Mode, while clearing this bit will select Slave Mode.

6.4 ADC Control - Address 04h

6.4.1 ADC Functional Mode (Bits 7:6)

Function:

Selects the required range of output sample rates.

DeEmph Description

0 Disabled (default)

1 44.1 kHz de-emphasis

Table 9. De-Emphasis Control

76543210

ADC_FM1 ADC_FM0 Reserved ADC_DIF Reserved MuteADC HPFFreeze ADC_M/S

ADC_FM1 ADC_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

11Reserved

Table 10. Functional Mode Selection

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

F1 F2

3.183 kHz 10.61 kHz

Figure 20. De-Emphasis Curve