TAS5548 datasheet(37/120 Pages) TI

37 / 120 page

TAS5548

www.ti.com

SLES270 – NOVEMBER 2012

After the initialization time, the TAS5548 starts the transition to the operational state with the master

volume set at mute.

Because the TAS5548 has an internal oscillator time base, following the release of reset, oscillator trim

command is needed so the TAS5548 can detect the MCLK and data rate and perform the initialization

sequences. The PWM outputs are held at a mute state until the master volume is set to a value other than

mute via I2C.

5.2.2

Power Down (PDN)

The TAS5548 can be placed into the power-down mode by holding the PDN terminal low. When the

power-down mode is entered, both the PLL and the oscillator are shut down. Volume is immediately set to

full attenuation (there is no ramp down). This control uses the PWM mute sequence that provides a low

click and pop transition to a non PWM switching mute state.

Power down is an asynchronous operation that does not require MCLK to go into the power-down state.

To initiate the power-up sequence requires MCLK to be operational and the TAS5548 to receive five

MCLKs prior to the release of PDN.

As long as the PDN pin is held low, the device is in the power-down state with the PWM outputs not

switching. During power down, all I2C and serial data bus operations are ignored. Table 5-3 shows the

device output signals while PDN is active.

Table 5-3. Device Outputs During Power Down

SIGNAL

SIGNAL STATE

VALID

Low

PWM P-outputs

Not Switching = Low

PWM M-outputs

Not Switching = Low

SDA

Inputs Ignored

PSVC

Low

Following the application of PDN, the TAS5548 does not perform a quiet shutdown to prevent clicks and

pops produced during the application (the leading edge) of this command. The application of PDN

immediately performs a PWM stop. A quiet stop sequence can be performed by first applying MUTE

before PDN.

When PDN is released, the system goes to the end state specified by the MUTE and BKND_ERR pins

and the I2C register settings.

TAS5548 Controls and Status

Submit Documentation Feedback

Product Folder Links: TAS5548

TAS5548 Datasheet(PDF) 37 Page - Texas Instruments

TAS5548 Datasheet(HTML) 37 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL