RT5509 datasheet(21/58 Pages) RICHTEK

21 / 58 page

RT5509

is a registered trademark of Richtek Technology Corporation

DS5509-00

August

2017

www.richtek.com

Audio Output

Compress

ion Filter

Attack/De

cay Filter

Energy

Filter.

Gain

Audio Input

1-AE

1-AA

1-AD

∑

-1

Alpha Filter Structure

Note :Ω = 1-α

Figure 15. DRC Structure and Signal Processing Path

Speaker Protection Functions

Excursion

Predict

stereo gain in

stereo gain out

data in

data out

(from DSP)

(to clipper)

Sig = u

Pilot

Data path

Control path

Lookahead buffer

Signal

Detect

ALC /Lmt

Gain Gen.

Gain Combining

Signal

Volume

Gain Gen.

Excur.

DCR

Calc.

Excursion Response

i_fb

VBAT

Clip

Ctrl

DC resistance

Maximum Signal Voltage

Figure 16. Block Diagram of SPK Protection Function

The following sub-clauses explain the function of each

sub-block.

Look-Ahead Delay Buffer

Look-ahead delay can be programed from 0 up to 480

samples, which is up to 10ms at 48k sampling rate.

This delay should contain stereo gain synchronization

delay.

Gain Processing on the Data Path

The level control, limiting for protection, and the volume

control are implemented by multiplying the signal on

the data path, with the gain generated from the control

path.

Pilot

The pilot signal, with constant magnitude (30mV) is

added at the last stage of data path. The frequency of

pilot is fixed fp = 50Hz. The pilot is disabled at

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