PCM3060 datasheet(34/48 Pages) TI2

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PCM3060

SLAS533B – MARCH 2007 – REVISED MARCH 2008

B15

B14

B13

B12

B11

B10

RSV

OVER

RSV

DREV2

MUT22

MUT21

OVER: Oversampling Rate Control (DAC)

Default value: 0

OVER

System clock = 512 fS or 768 fS

System clock = 256 fS or 384 fS

System clock = 128 fS or 192 fS

OVER = 0

×64 Oversampling (default)

×32 Oversampling (default)

×16 Oversampling (default)

OVER = 1

×128 Oversampling

×64 Oversampling

×32 Oversampling

The OVER bit is used to control the oversampling rate of the delta-sigma D/A converters.

Setting OVER = 1 might improve out-of-band noise characteristics in some application environments, but it might

also slightly affect baseband performance.

Writing over this bit during normal operation may generate pop noise.

DREV2: Output Phase Select (DAC)

Default value: 0

DREV2 = 0

Normal output (default)

DREV2 = 1

Inverted output

The DREV2 bit is used to control the phase of the analog signal outputs (VOUTL and VOUTR).

MUT2x: Soft Mute Control (DAC)

where x = 1 or 2, corresponding to the DAC output VOUTL (x = 1) and VOUTR (x = 2).

Default value: 0

MUT2x = 0

Mute disabled (default)

MUT2x = 1

Mute enabled

The mute bits, MUT21 and MUT22, are used to enable or disable the soft mute function for the corresponding

DAC outputs, VOUTL and VOUTR. The soft mute function is incorporated into the digital attenuators. When mute is

disabled (MUT2x = 0), the attenuator and DAC operate normally. When mute is enabled by setting MUT2x = 1,

the digital attenuator for the corresponding output is decreased from the current setting to infinite attenuation at

the rate of one 0.5-dB step for every 8/fS time interval. By setting MUT2x = 0, the attenuator is increased to the

previously programmed attenuation level at the rate of one 0.5-dB step for every 8/fS time interval. This provides

pop-free muting of the DAC output.

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