STA559BW datasheet(31/67 Pages) STMICROELECTRONICS

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STA559BW

Max power correction

Setting the MPC bit turns on special processing that corrects the STA559BW power device

at high power. This mode should lower the THD+N of a full FFX system at maximum power

output and slightly below. If enabled, MPC is operational in all output modes except tapered

(OM[1,0] = 01) and binary. When OCFG = 00, MPC has no effect on channels 3 and 4, the

line-out channels.

Noise-shaper bandwidth selection

AM mode enable

STA559BW features a FFX processing mode that minimizes the amount of noise generated

in frequency range of AM radio. This mode is intended for use when FFX is operating in a

device with an AM tuner active. The SNR of the FFX processing is reduced to approximately

83 dB in this mode, which is still greater than the SNR of AM radio.

PWM speed mode

Table 35. Max power correction

Bit

R/W

RST

Name

Description

1R/W

MPC

0: function disabled

1: enables power bridge correction for THD

reduction near maximum power output.

Table 36. Noise-shaper bandwidth selection

Bit

R/W

RST

Name

Description

R/W

NSBW

1: third-order NS

0: fourth-order NS

Table 37. AM mode enable

Bit

R/W

RST

Name

Description

3R/W

AME

0: normal FFX operation.

1: AM reduction mode FFX operation

Table 38. PWM speed mode

Bit

R/W

RST

Name

Description

4R/W

PWMS

0: normal speed (384 kHz) all channels

1: odd speed (341.3 kHz) all channels

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