STA32613TR データシートの表示（PDF） - STMicroelectronics

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STA32613TR

2.1 HIGH EFFICIENCY DIGITAL AUDIO SYSTEM

STMicroelectronics 

STA326

7.6.4 AM Mode Enable

BIT

R/W

RST

NAME

DESCRIPTION

3

R/W

0

AME

AM Mode Enable:

0 – Normal DDX® operation.

1 – AM reduction mode DDX® operation.

The STA326 features a DDX® processing mode that minimizes the amount of noise generated in the fre-

quency 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 ~83dB in this mode, which is still greater

than the SNR of AM radio.

7.6.5 PWM Speed Mode

BIT R/W RST

4

R/W

0

NAME

PWMS

DESCRIPTION

PWM Speed Selection: Normal or Odd

Table 14. PWM Output Speed Selections

PWMS (1...0)

0

1

PWM Output Speed

Normal Speed (384kHz) All Channels

Odd Speed (341.3kHz) All Channels

7.6.6 Zero-Crossing Volume Enable

BIT

R/W

RST

NAME

DESCRIPTION

6

R/W

1

ZCE

Zero-Crossing Volume Enable:

1 – Volume adjustments will only occur at digital zero-crossings

0 – Volume adjustments will occur immediately

The ZCE bit enables zero-crossing volume adjustments. When volume is adjusted on digital zero-cross-

ings no clicks will be audible.

7.6.7 Soft Volume Update Enable

BIT

R/W

RST

NAME

DESCRIPTION

7

R/W

1

SVE

Soft Volume Enable:

1 – Volume adjustments will use soft volume

0 – Volume adjustments will occur immediately

The STA326 includes a soft volume algorithm that will step through the intermediate volume values at a

predetermined rate when a volume change occurs. By setting SVE=0 this can be bypassed and volume

changes will jump from old to new value directly. This feature is only available if individual channel volume

bypass bit is set to ‘0’.

7.7 Configuration Register F (Address 05h)

D7

EAPD

0

D6

PWDN

1

D5

ECLE

0

D4

RES

1

D3

D2

BCLE

IDE

1

1

D1

OCFG1

1

D0

OCFG0

0

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