STA350BW datasheet(71/86 Pages) STMICROELECTRONICS

71 / 86 page

STA350BW

Doc ID 018572 Rev 3

71/86

7.17

EQ coefficients and DRC configuration register (addr 0x31)

Bits AMGC[3:2] change the behavior of the bits AMGC[1:0] as given in Table 73 below.

When AMGC[3:2] = 01 then the bits 1:0 are defined as given here in Table 74.

The AC0, AC1, AC2 settings are designed for the loudspeaker protection function, limiting at

the minimum any audio artifacts introduced by typical anti-clipping/DRC algorithms. More

detailed information is available in the applications notes “Configurable output power rate

using STA335BW” and “STA335BWS vs STA335BW”.

The XOB bit can be used to bypass the crossover filters. Logic 1 means that the function is

not active. In this case, the high-pass crossover filter works as a pass-through on the data

path (b0 = 1, all the other coefficients at logic 0) while the low-pass filter is configured to

have zero signal on channel-3 data processing (all the coefficients are at logic 0).

XOB

Reserved

AMGC[3]

AMGC[2]

Reserved

SEL[1]

SEL[0]

Table 72.

EQ RAM select

SEL[1:0]

EQ RAM bank selected

00/11

Bank 0 activated

Bank 1 activated

Bank 2 activated

Table 73.

Anti-clipping and DRC preset

AMGC[3:2]

Anti clipping and DRC preset selected

DRC/Anti-clipping behavior described in Table 53 on page 53 (default).

DRC/Anti-clipping behavior is described Table 74 on page 71

10/11

Reserved, do not use

Table 74.

Anti-clipping selection for AMGC[3:2] = 01

AMGC[1:0]

Mode

AC0, stereo anticlipping 0 dB limiter

AC1, stereo anticlipping +1.25 dB limiter

AC2, stereo anticlipping +2 dB limiter

Reserved do not use

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