PCM3794A datasheet(21/68 Pages) BURR-BROWN

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PCM3793A

PCM3794A

SLAS529A – JANUARY 2007 – REVISED FEBRUARY 2007

Table 3. Recommended Power-On Sequence

STEP

NOTE

SETTINGS

–

Turn on all power supplies(1)

4027h

Headphone amplifier L-ch volume (–6 dB)(2)

4127h

Headphone amplifier R-ch volume (–6 dB)(2)

4227h

Speaker amplifier L-ch volume (–6 dB)(2)

4327h

Speaker amplifier R-ch volume (–6 dB)(2)

4427h

Digital attenuator L-ch (–24 dB)(2)

4527h

Digital attenuator R-ch (–24 dB)(2)

4620h

DAC audio interface format (left-justified)(3)

4BC0h

Headphone detection enable and inverting polarity. Short and thermal detection enable

5102h

ADC audio interface format (left-justified)(3)

5A10h

VCOM ramp up/down time control. PG1, PG2 gain control (0 dB)

49E0h

DAC (DAL, DAR) and analog bias power up

5601h

Zero-cross detection enable

4803h

Analog mixer (MXL, MXR) power up

5811h

Analog mixer input (SW2, SW5) select

49FCh

Headphone amplifier (HPL, HPR, HPC) power up

4C03h

Speaker amplifier shut down release

4A01h

VCOM power up

523Fh

Analog front end (ADL, ADR, D2S, MCB, PG1, 2, 5, 6) power up

5711h

Analog input (MUX3, MUX4) select. Analog input (MUX1, MUX2) select

4F0Ch

Analog input L-ch (PG3) volume (0 dB)(2)

500Ch

Analog input R-ch (PG4) volume (0 dB)(2)

–

Any settings for other devices or wait time, 450 ms(4)(5)

49FFh

Speaker amplifier (SPL, SPR) power up (5)

(1)

VDD should be turn on prior to or simultaneously with the other power supplies. It is recommended to set register data with the system

clock input after turning all power supplies on.

(2)

Any level is acceptable for volume or attenuation. Level should be resumed by register data recorded when system power off.

(3)

Audio interface format should be set to match the DSP or decoder being used.

(4)

The PCM3793A requires time for VCOM to reach the common level from GND level. The delay depends on the capacitor value for VCOM

and the setting of register 125 PTM[1:0], RES[4:0]. The default setting is 450 ms at VCOM = 4.7 µs.

(5)

The PCM3794A does not require this setting because it has no speaker output.

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