CRD4525-Q1 Cirrus Logic Inc, CRD4525-Q1 Datasheet - Page 29

• Manufacturer Part Number: CRD4525-Q1
• Description: REFERENCE BOARD FOR CS4525 PWM
• Manufacturer: Cirrus Logic Inc
• Series: Popguard®r

Specifications of CRD4525-Q1

• Amplifier Type: Class D
• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 15W x 2 @ 8 Ohm
• Voltage - Supply: 12 V ~ 18 V
• Operating Temperature: 0°C ~ 70°C
• Board Type: Fully Populated
• Utilized Ic / Part: CS4525
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1586

DS726PP3
6.1.3
6.1.4
Clocks & Data
Clocks & Data
Serial Audio
Serial Audio
Serial Audio
Temperature
Serial Audio
Analog In
Data I/O
Data In
Stereo
Sense
The CS4525 internal ADC includes a dedicated high-pass filter to remove any DC content from the ADC
output signal prior to the internal ADC/serial audio input port input multiplexor. This high-pass filter can be
bypassed by clearing the EnAnHPF bit.
Input Source Selection
The CS4525 can accept analog or digital audio input signals. Digital audio input signals are supplied
through the serial audio input port as outlined in
signals are supplied through the internal ADC as outlined in
is selected by the ADC/SP bit in the Input Config register.
In software mode, the serial audio input port supports I²S, Left-Justified and Right-Justified data formats.
The serial audio input port digital interface format is configured by the DIF[2:0] bits in the Input Config reg-
ister.
Digital Sound Processing
The CS4525 implements flexible digital sound processing operations including bass management cross-
over, 2-way speaker crossovers, high- and low-pass shelving filters, programmable parametric EQ filters,
adaptive loudness compensation, channel mixers, and volume controls.
The digital signal flow is shown in
in the following sections.
Referenced Control
ADC/SP...............................
DIF[2:0] ...............................
EnAnHPF ............................
Right
Left
ADC
Serial Audio
Serial Audio
Serial Port
Input Port
Interface
Auxiliary
Delay
High-
Pass
Ch. A
Ch. B
Register Location
“Input Source Selection (ADC/SP)” on page 71
“Input Serial Port Digital Interface Format (DIF [2:0])” on page 71
“ADC High-Pass Filter Enable (EnAnHPF)” on page 71
Parametric EQ
High-Pass
Bass/Treble
Adaptive
Loudness
Compensation
2-Ch Mixer
2.1 Bass Mgr
Linkwitz-Riley
Crossover
De-Emphasis
Volume
Processing
Audio
Figure 14. Digital Signal Flow
Figure 14
Ch. 1
Ch. 2
Sub
Converter
Converter
Converter
Thermal Foldback
Sample
Sample
Sample
Rate
Rate
Rate
Loudness
Temperature Sense
below. The signal processing blocks are described in detail
Ch. A
Ch. B
Sub
“Serial Audio Interfaces” on page
Modulator
Modulator
Modulator
PWM
PWM
PWM
Thermal Limiter
“Analog Inputs” on page
Output
Config
PWM
Aux Serial Data Select
Ch. A HPF
Ch. A LPF
Ch. B HPF
Ch. B LPF
Ch. B HPF
Drive
Drive
Drive
Drive
Gate
Gate
Gate
Gate
62. Analog audio input
Ch. B LPF
Ch. A HPF
Ch. A LPF
Power
Power
Power
Power
61. The input source
Stage
Stage
Stage
Stage
Ch. A
Ch. B
CS4525
Amplifier
Out 1
Amplifier
Out 2
Amplifier
Out 3
Amplifier
Out 4
PWM Modulator
Output 1
PWM Modulator
Output 2
Ch. 1
Ch. 2
Sub
Data to
Aux Port
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