PCM1774 datasheet(13/49 Pages) TI

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Power-Supply Current

PCM1774

SLAS551 – JULY 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)

4427h

Digital attenuator L-ch (–24 dB)(2)

4527h

Digital attenuator R-ch (–24 dB) (2)

4620h

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

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

49ECh

Headphone amplifier (HPL, HPR, HPC) power up

4A01h

VCOM power up

5230h

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

5711h

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

(1)

VDD should be turned 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 powers off.

(3)

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

Table 4. Recommended Power-Off Sequence

STEP

NOTE

SETTINGS

447Fh

DAC L-ch digital soft-mute enable(1)

457Fh

DAC R-ch digital soft-mute enable(1)

5811h

Analog mixer input (SW2, SW5) select

49ECh

Headphone amplifier (HPL, HPR, HPC) power up(2)

5200h

Analog front end (D2S, MCB, PG1, 2, 5, 6) power down

5A00h

PG1, PG2 gain control (0 dB)

4A00h

VCOM power down

–

Wait time (750 ms) (3)

49E0h

Headphone amplifier (HPL, HPR, HPC) power down, speaker amplifier (SPL, SPR) power down

4800h

Analog mixer (MXL, MXR) power down

4900h

DAC (DAL, DAR) and analog bias power down

–

Turn off all power supplies.(4)

(1)

Any level is acceptable for volume or attenuation.

(2)

The headphone amplifier must be operating during the power-off sequence.

(3)

PCM1774 requires time for VCOM to reach the ground level from the common level. The wait time allowed depends on the settings of

(4)

Power supply sequencing is not required. It is recommended to turn off all power supplies after setting the registers with the system

clock input.

The current consumption of the PCM1774 depends on power up/down status of each circuit module. In order to

reduce the power consumption, disabling each module is recommended when it is not used in an application or

operation. Table 5 shows the current consumption in some states.

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