CS4525 datasheet(80/98 Pages) CIRRUS

80 / 98 page

DS726PP1

CS4525

9.10 Volume and 2-Way Cross-Over Configuration (Address 55h)

9.10.1 Soft Ramp and Zero Cross Control (SZCMode[1:0])

Default = 10

Function:

Sets the soft ramp and zero crossing detection modes by which volume and muting changes will be im-

plemented.

9.10.2 Enable 50% Duty Cycle for Mute Condition (Mute50/50)

Default = 0

Function:

When set, the amplifiers will output a non-modulated 50%-duty-cycle signal for all mute conditions. This

bit does not cause a mute condition to occur. The Mute50/50 bit only defines operation during a normal

mute condition.

9.10.3 Auto-Mute (AutoMute)

Default = 1

Function:

When enabled, the outputs of the CS4525 will mute following the reception of 8192 consecutive audio

samples of static 0 or -1. A single sample of non-static data will release the mute. Detection and muting

is done independently for each channel. See “Volume and Muting Control” on page 36 for more informa-

tion.

543

SZCMode1

SZCMode0

Mute50/50

AutoMute

En2Way

2WayFreq2

2WayFreq1

2WayFreq0

SZCMode[1:0] Setting

Soft Ramp & Zero Crossing Mode

00 ........................................Immediate Change

When immediate change is selected, all level changes will take effect immediately in one step.

01 ........................................Zero Cross

Zero cross dictates that signal level changes, both muting and attenuation, will occur on a signal

zero crossing to minimize audible artifacts. The requested level change will occur after a timeout

period (approximately 18.7 ms for a PWM switch rate of 384/768 kHz and 17.0 ms for a PWM

switch rate of 421.875/843.75 kHz) if the signal does not encounter a zero crossing. The zero cross

function is independently monitored and implemented for each channel.

10 ........................................Soft Ramp

Soft ramp allows level changes, both muting and attenuation, to be implemented by incrementally

ramping, in ½ dB steps, from the current level to the new level at a rate of ½ dB per 4 sample peri-

ods for 32, 44.1, and 48 kHz, and ½ dB per 8 sample periods for 96 kHz.

11.........................................Soft Ramp on Zero Cross

Soft ramp on zero cross dictates that signal level changes, both muting and attenuation, will occur in

½ dB steps and be implemented on a signal zero crossing. The ½ dB level change will occur after a

timeout period (approximately 18.7 ms for a PWM switch rate of 384/768 kHz and 17.0 ms for a

PWM switch rate of 421.875/843.75 kHz) if the signal does not encounter a zero crossing. The zero

cross function is independently monitored and implemented for each channel.

Mute50/50 Setting

50% Duty Cycle Mute State

0 ..........................................50% duty cycle for mute conditions disabled.

1 ..........................................50% duty cycle for mute conditions enabled.

AutoMute Setting

AutoMute State

0 ..........................................Auto-mute on static 0’s or -1’s disabled.

1 ..........................................Auto-mute on static 0’s or -1’s enabled.

CS4525 Datenblatt(PDF) 80 Page - Cirrus Logic

CS4525 Datenblatt(HTML) 80 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98

Datenblatt Download

Link URL