CS4525 datasheet(41/91 Pages) CIRRUS

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DS726A1

CS4525

6.1.4.12

2-Way Crossover & Sensitivity Control

The CS4525 implements a dedicated stereo 24 dB/octave Linkwitz-Riley crossover filter with adjustable

cross-over frequency and sensitivity control to facilitate 2-way speaker configurations. The filter’s high-

pass output can be used to drive the tweeter, and its low-pass output is used can be drive the mid-

range/woofer. The sensitivity control is included to adjust the level of the high-pass and low-pass outputs

to compensate for differences in the tweeter and mid-range/woofer sensitivity.

The two-way crossover is implemented with one of two preset internal filter sets. One set is optimized for

a 32 kHz sample rate, and the other is optimized for 44.1 kHz, 48 kHz, and 96 kHz sample rates. The

CS4525 automatically detects the input sample rate and chooses the appropriate filter set to apply. The

available cross-over frequencies are shown in Table 5 below and are configured with the 2WayFreq[2:0]

bits in the Volume Cfg register.

Note that the corner frequency of each filter set scales linearly with the input sample rate.

When the internal ADC is used as the serial audio data source, the input sample rate is nominally 48 kHz

and the corresponding shelving frequency corners are available.

The sensitivity level of the high- and low-pass outputs of the crossovers can be independently adjusted

from 0 dB to -7.5 dB in 0.5 dB increments. The maximum attenuation level of -7.5 dB will compensate for

an approximate 4 dB difference in sound pressure level (SPL) between the tweeter and the mid-

range/woofer drivers. The sensitivity is adjusted using the HighPass[3:0] and LowPass[3:0] bits in the

Sensitivity register. Note that these bits affect the sensitivity of both channel 1 and channel 2 low- and

high-pass outputs.

The 2-way crossover can be enabled by setting the En2Way bit in the Volume Cfg register.

Input Sample Rate

32 kHz

44.1 kHz

48 kHz, 96 kHz

X-Over Freq 0

2.0 kHz

1.92 kHz

2.09 kHz

X-Over Freq 1

2.2 kHz

2.11 kHz

2.30 kHz

X-Over Freq 2

2.4 kHz

2.30 kHz

2.50 kHz

X-Over Freq 3

2.6 kHz

2.49 kHz

2.71 kHz

X-Over Freq 4

2.8 kHz

2.68 kHz

2.92 kHz

X-Over Freq 5

3.0 kHz

2.88 kHz

3.13 kHz

X-Over Freq 6

3.2 kHz

3.07 kHz

3.34 kHz

X-Over Freq 7

3.4 kHz

3.26 kHz

3.55 kHz

Table 5. 2-Way Cross-Over Frequencies

Referenced Control

En2Way............................... “Enable 2-Way Crossover (En2Way)” on page 76

2WayFreq[2:0]..................... “2-Way Cross-Over Frequency (2WayFreq[2:0])” on page 76

HighPass[3:0]...................... “Channel 1 and Channel 2 High-Pass Sensitivity Adjust (HighPass[3:0])” on page 77

LowPass[3:0]....................... “Channel 1 and Channel 2 Low-Pass Sensitivity Adjust (LowPass[3:0])” on page 76

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