STA328 datasheet(29/57 Pages) STMICROELECTRONICS

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STA328

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6.5

Configuration register E (addr 0x04)

By enabling MPC and setting MPCV = 1, the max power correction becomes variable. By

adjusting the MPCC registers (address 0x27, 0x28) it becomes possible to adjust the THD

at maximum unclipped power to a lower value for a particular application.

Setting the MPC bit corrects the DDX® power device at high power. This mode lowers the

THD+N of a full DDX® system at maximum power output and slightly below.

The STA328 features a DDX® processing mode that minimizes the amount of noise

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

operating in a device with an active AM tuner. The SNR of the DDX® processing is reduced

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

SVE

ZCE

Reserved

PWMS

AME

Reserved

MPC

MPCV

001

Table 33.

Max power correction variable

Bit

R/W

RST

Name

Description

0RW

MPCV

Max power correction variable:

0: use standard MPC coefficient

1: use MPCC bits for MPC coefficient

Table 34.

Max power correction

Bit

R/W

RST

Name

Description

1RW

MPC

Max power correction:

0: MPC disabled

1: MPC enabled

Table 35.

AM mode enable

Bit

R/W

RST

Name

Description

3RW

AME

AM mode enable:

0: normal DDX® operation.

1: AM reduction mode DDX® operation.

Table 36.

PWM speed mode

Bit

R/W

RST

Name

Description

PWMS

PWM speed selection: normal or odd

Table 37.

PWM output speed selections

PWMS[1:0]

PWM output speed

Normal speed (384 kHz) all channels

Odd speed (341.3 kHz) all channels

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