DS640PP4

19

CS44L11

4.8

Volume and Mixing Control (address 09h)

4.8.1

Ramp Speed (RMP_SP)

Default = 01

00 - Ramp speed = approximately 0.1 seconds

01 - Ramp speed = approximately 0.2 seconds

10 - Ramp speed = approximately 0.3 seconds

11 - Ramp speed = approximately 0.65 seconds

Function:

This feature is used in Single-Ended applications to reduce pops in the output caused by the DC-blocking

capacitor. When in Control Port Mode, the Ramp Speed sets the time for the PWM signal to linearly ramp

up and down from the bias point (50% PWM duty cycle). Refer to Section 6.4.

4.8.2

ATAPI Channel Mixing and Muting (ATAPI)

Default = 1001 - HP_A = L, HP_B = R (Stereo)

Function:

The CS44L11 implements the channel mixing functions of the ATAPI CD-ROM specification. Refer to

Table 10 and Figure 5 for additional information.

Note:

All mixing functions occur prior to the digital volume control.

7

6

5

432

10

Reserved

Reserved

RMP_SP1

RMP_SP0

ATAPI3

ATAPI2

ATAPI1

ATAPI0

0

0

0

010

01

ATAPI3

ATAPI2

ATAPI1

ATAPI0

HP_A

HP_B

0000

MUTE

MUTE

0001

MUTE

R

0010

MUTE

L

0011

MUTE

[(L+R)/2]

0100

R

MUTE

0101

R

R

0110

R

L

0111

R

[(L+R)/2]

1000

L

MUTE

1001

L

R

1010

L

L

1011

L

[(L+R)/2]

1100

[(L+R)/2]

MUTE

1101

[(L+R)/2]

R

1110

[(L+R)/2]

L

1111

[(L+R)/2]

[(L+R)/2]

Table 10. ATAPI Decode