CS4525-CNZ Cirrus Logic Inc, CS4525-CNZ Datasheet - Page 80

• Manufacturer Part Number: CS4525-CNZ
• Description: IC AMP AUDIO PWR 30W QUAD 48QFN
• Manufacturer: Cirrus Logic Inc
• Series: Popguard®r
• Type: Class Dr

Specifications of CS4525-CNZ

• Output Type: 2-Channel (Stereo) or 4-Channel (Quad)
• Package / Case: 48-QFN
• Max Output Power X Channels @ Load: 30W x 1 @ 4 Ohm; 15W x 2 @ 8 Ohm
• Voltage - Supply: 8 V ~ 18 V
• Features: ADC, Depop, I²C, I²S, Mute, PWM, Short-Circuit and Thermal Protection, Volume Control
• Mounting Type: Surface Mount
• Product: Class-D
• Output Power: 30 W
• Thd Plus Noise: 10 %
• Operating Supply Voltage: 2.5 V to 5 V
• Supply Current: 54 mA
• Maximum Power Dissipation: 180 mW
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Audio - Load Impedance: 4 Ohms, 6 Ohms, 8 Ohms
• Audio Load Resistance: 8 Ohms, 4 Ohms
• Minimum Operating Temperature: 0 C
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 2.375 V
• Amplifier Class: D
• No. Of Channels: 4
• Supply Voltage Range: 8V To 18V
• Load Impedance: 4ohm
• Operating Temperature Range: 0°C To +70°C
• Amplifier Case Style: QFN
• No. Of Pins: 48
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1586 - REFERENCE BOARD FOR CS4525 PWM
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 598-1264

80
9.10
9.10.1 Soft Ramp and Zero Cross Control (SZCMode[1:0])
9.10.2 Enable 50% Duty Cycle for Mute Condition (Mute50/50)
9.10.3 Auto-Mute (AutoMute)
SZCMode1
7
Volume and 2-Way Cross-Over Configuration (Address 55h)
Default = 10
Function:
Sets the soft ramp and zero crossing detection modes by which volume and muting changes will be im-
plemented.
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.
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
tion.
SZCMode[1:0] Setting
Mute50/50 Setting
AutoMute Setting
00 ........................................ Immediate Change
01 ........................................ Zero Cross
10 ........................................ Soft Ramp
11......................................... Soft Ramp on Zero Cross
0 .......................................... 50% duty cycle for mute conditions disabled.
1 .......................................... 50% duty cycle for mute conditions enabled.
0 .......................................... Auto-mute on static 0’s or -1’s disabled.
1 .......................................... Auto-mute on static 0’s or -1’s enabled.
SZCMode0
6
Mute50/50
Soft Ramp & Zero Crossing Mode
50% Duty Cycle Mute State
AutoMute State
When immediate change is selected, all level changes will take effect immediately in one step.
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.
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.
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.
5
AutoMute
4
“Volume and Muting Control” on page 36
En2Way
3
2WayFreq2
2
2WayFreq1
1
for more informa-
2WayFreq0
CS4525
DS726PP2
0