STA333IS datasheet(27/43 Pages) STMICROELECTRONICS

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STA333IS

Max power correction

Setting the MPC bit turns on special processing that corrects the STA333IS power device at

high power. This mode lowers 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 does not affect channels 3 and 4, the

line-out channels.

Noise-shaper bandwidth selection

AM mode enable

The STA333IS features an FFX processing mode that minimizes the amount of noise

generated in the frequency range of AM radio. This mode is intended for use when FFX is

operating in a device with an active AM tuner. 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

Distortion compensation variable enable

Table 26. Max power correction

Bit

R/W

RST

Name

Description

1R/W

1MPC

1: enable power bridge correction for THD reduction

near maximum power output.

Table 27. Noise-shaper bandwidth selection

Bit

R/W

RST

Name

Description

2R/W

0NSBW

1: 3rd order NS

0: 4th order NS

Table 28. AM mode enable

Bit

R/W

RST

Name

Description

3R/W

0AME

0: normal FFX operation

1: AM reduction mode FFX operation

Table 29. PWM speed mode

Bit

R/W

RST

Name

Description

4R/W

0PWMS

0: normal speed (384 kHz) all channels

1: odd speed (341.3 kHz) all channels

Table 30. Distortion compensation variable enable

Bit

R/W

RST

Name

Description

5R/W

0DCCV

0: uses preset DC coefficient

1: uses DCC coefficient

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