CS4525 datasheet(56/98 Pages) CIRRUS

56 / 98 page

DS726PP1

CS4525

6.2.5

Digital Signal Flow

In hardware mode, the CS4525 operates as a 2-channel full-bridge PWM amplifier with analog or digital

inputs. Both the PWM outputs and the auxiliary serial outputs are unavailable in hardware mode. To pro-

tect against over-temperature conditions, thermal foldback is included for the internal power stages.

The digital signal flow is shown in Figure 24 below.

Figure 24. Hardware Mode Digital Signal Flow

6.2.5.1

High-Pass Filter

The CS4525 includes a high-pass filter at the beginning of the digital signal processing chain to remove

any DC content from the input signal prior to the remaining internal digital signal processing blocks. The

high-pass filter operates by continuously subtracting a measure of the DC offset from the input signal; it

is always enabled.

6.2.5.2

Mute Control

The CS4525 includes a dedicated MUTE input pin. When low, the PWM outputs will output silence as

modulated signal. When high, the selected input source will be presented at the amplifier outputs.

It should be noted that the auto-mute, soft-ramp, and zero-crossing detection features are active in hard-

ware mode.

6.2.5.3

Warning and Error Reporting

The CS4525 is capable of reporting various error and warning conditions on its TWR, ERROC, and ER-

RUVTE pins.

•The TWR pin indicates the presence of a thermal warning condition. When active concurrently with the

ERRUVTE pin, indicates a thermal error condition.

• The ERROC pin indicates the presence of an over-current condition on one or both of the output chan-

nels.

• The ERRUVTE pin indicates the presence of a VP undervoltage condition. When active concurrently

with the TWR pin, indicates a thermal error condition.

The trigger point for each warning and error condition is defined in the PWM Power Output Characteristics

table on page 20. Each pin implements an active-low open-drain driver and requires an external pull-up

for proper operation.

Left

Full-Bridge

Amplifier

Output

Sample

Rate

Converter

PWM

Modulator

Sample

Rate

Converter

PWM

Modulator

Thermal Foldback

Temp & Current

Sense

ADC/SP

Stereo

Analog In

Serial Audio

Clocks & Data

I²S/LJ

Serial Audio

Input Port

Multi-Bit

ΔΣ ADC

EN_TFB

Right

Full-Bridge

Amplifier

Output

Gate

Drive

Power

Stage

Gate

Drive

Power

Stage

Gate

Drive

Power

Stage

Gate

Drive

Power

Stage

TWR

ERROC

ERRUVTE

MUTE

+3dB

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