RT5508 datasheet(18/57 Pages) RICHTEK

部件名	RT5508

功能描述	Speaker Amplifier with Speaker Protection

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制造商	RICHTEK [Richtek Technology Corporation]

网页	http://www.richtek.com

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RT5508

is a registered trademark of Richtek Technology Corporation

www.richtek.com

DS5508-01

March

2017

18

Sampling Rate Delay

The SRC introduces delay with respect to different I2S sampling rates, which is shown in Table 2.

Table. 2Sampling Rate Conversion Delay

I2S sampling rate

Delay

Absolute Delay

fs = 8k

29/fs

3.6ms

fs = 11.025k

28/fs

2.5ms

fs = 12k

28/fs

2.3ms

fs = 16k

29/fs

1.8ms

fs = 22.05k

26/fs

1.2ms

fs = 24k

26/fs

1.1ms

fs = 32k

29/fs

0.9ms

fs = 44.1k

0/fs

0ms

fs = 48k

0/fs

0ms

The I2S signals at different sampling rate are all

up-sampled to 48ksps or 44.1ksps before DSP

processing or pass-through to PWM + class D amplifier.

The data path delay is dominated by the group delay of

SRC, the look-ahead delay of gain limiter, and some

minor delay in SPK protection algorithm (<0.5ms).

For example: the worst case loopback delay of I2S may

be about 16ms (3.6*2+8+0.5) if fs = 8k and look-ahead

delay = 8ms.

Signal Processing Path

After sampling rate conversion, the signal is processed

by two sub-functions as shown in Figure 13. The

pre-filters are some audio effect related functions, and

the SPK protection block is the core function for

speaker protection.

10 BiQ

HPF

LPF

BWE

D

I sense

Speaker

SI

DCR

impedance

Delay

Gain

Limit

Excur.

Calc.

ALC

Ampl.

Control

Excur.

Control

pilot

DCR.

Control

MBDRC

(Audio Effect) DSP

SPK Protection

Volume /

Ramp

↑↓

From

SRC

1

SPKE

Clip

VBAT

sense

S_clip

Figure 13. Signal Processing Path

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