STA339BWS datasheet(34/79 Pages) STMICROELECTRONICS

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STA339BWS

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DocID015276 Rev 8

Setting the MPC bit turns on special processing that corrects the STA339BWS 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

STA339BWS 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

Distortion compensation variable enable

Table 37. Noise-shaper bandwidth selection

Bit

R/W

RST

Name

Description

R/W

NSBW

1: third-order NS

0: fourth-order NS

Table 38. AM mode enable

Bit

R/W

RST

Name

Description

R/W

AME

0: normal FFX operation.

1: AM reduction mode FFX operation

Table 39. PWM speed mode

Bit

R/W

RST

Name

Description

R/W

PWMS

0: normal speed (384 kHz) all channels

1: odd speed (341.3 kHz) all channels

Table 40. Distortion compensation variable enable

Bit

R/W

RST

Name

Description

R/W

DCCV

0: use preset DC coefficient

1: use DCC coefficient

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