CS4525 datasheet(35/98 Pages) CIRRUS

35 / 98 page

DS726PP1

CS4525

6.1.4.8

Bass Management

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

over frequency to achieve bass management for 2.1 configurations. The filter’s stereo high-pass outputs

are used to drive the full-range speakers, and its stereo low-pass outputs are each attenuated by 6 dB

and summed to drive the sub channel.

The bass management crossover is implemented with one of two preset internal filter sets. One set is op-

timized 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 bass management cross-over frequencies are shown in Table 4 below and are con-

figured with the BassMgr[2:0] bits in the EQ Config 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 BassMgr[2:0] bits also allow the bass manager to be disabled. When disabled, the bass management

crossover is bypassed and no signal is presented on the sub channel.

To allow full-range headphone operation, when the HP_DETECT/MUTE pin is configured for headphone

detection (the HP/Mute bit is set), the operation of the bass manager is affected by the active state of the

headphone detection input signal. In this configuration, when the bass manager is enabled, (BassMgr[2:0]

bits not equal to ‘000’) and the headphone detection input signal becomes active, the bass manager will

be automatically disabled. When the headphone detection input signal becomes inactive, the bass man-

ager will be automatically reconfigured to operate as dictated by the BassMgr[2:0] bits.

Input Sample Rate

32 kHz

44.1 kHz

48 kHz, 96 kHz

Bass Manager Freq 1

80 Hz

77 Hz

83 Hz

Bass Manager Freq 2

120 Hz

115 Hz

125 Hz

Bass Manager Freq 3

160 Hz

153 Hz

167 Hz

Bass Manager Freq 4

200 Hz

192 Hz

209 Hz

Bass Manager Freq 5

240 Hz

230 Hz

250 Hz

Bass Manager Freq 6

280 Hz

268 Hz

292 Hz

Bass Manager Freq 7

320 Hz

307 Hz

334 Hz

Table 4. Bass Management Cross-Over Frequencies

Referenced Control

BassMgr[2:0] ....................... “Bass Cross-Over Frequency (BassMgr[2:0])” on page 79

HP/Mute .............................. “HP_Detect/Mute Pin Mode (HP/Mute)” on page 70

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