PCM1609APT datasheet(20/43 Pages) TI

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MODE CONTROL REGISTERS

User-Programmable Mode Controls

PCM1609A

SLES145A – AUGUST 2005 – REVISED AUGUST 2006

The PCM1609A includes a number of user-programmable functions that are accessed via control registers. The

registers are programmed using the serial control interface that is previously discussed in this data sheet.

Table 3 lists the available mode control functions, along with their reset default conditions and associated

Table 3. User-Programmable Mode Controls

CONTROL

FUNCTION

RESET DEFAULT

BIT(S) LABEL

AT1[7:0], AT2[7:0],

1 through 6, 16,

AT3[7:0], AT4[7:0],

Digital attenuation control, 0 dB to –63 dB in 0.5-dB steps

0 dB, no attenuation

AT5[7:0], AT6[7:0],

AT7[7:0], AT8[7:0]

Soft mute control

Mute disabled

7, 18

MUT[8:1]

DAC1–DAC8 operation control

DAC1–DAC8 enabled

8, 19

DAC[8:1]

Audio data format control

24-bit standard format

FMT[2:0]

Digital filter rolloff control

Sharp rolloff

FLT

SCKO frequency selection

Full rate (= fSCKI)

CLKD

SCKO output enable

SCKO enabled

CLKE

De-emphasis, all channels

De-emphasis all-channel function control

DMC

disabled

De-emphasis all-channel sample rate selection

44.1 kHz

DMF[1:0]

Output phase select

Normal phase

DREV

Zero-flag polarity select

High

ZREV

Read-register index control

REG[6:0] = 01h

REG[6:0]

Read auto-increment control

Auto-increment disabled

INC

General-purpose output enable

Zero-flag enabled

GPOE

General-purpose output bits (GPO1–GPO6)

Disabled

GPO[6:1]

Oversampling rate control

OVER

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