TAS5548DCAR datasheet(21/116 Pages) TI1

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TAS5548

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SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

Table 2. Values Set During Reset

CONTROL

SETTING

Output mixer configuration

0xD0 bit 30 = 0 (remapped output mixer configuration)

High pass

Enabled

Unmute from clock error

Hard unmute

Input automute

Enabled

Output automute

Enabled

Serial data interface format

I2S, 24-bit

Individual channel mute

No channels are muted

Automute delay

14.9 ms

Automute threshold 1

< 8 bits

Automute threshold 2

Same as automute threshold 1

Modulation limit

93.7% (Note: Some power stages require a lower

modulation index)

Six- or eight-channel configuration

Eight channels

Volume and mute update rate

Volume ramp 42.6 ms

Treble and bass slew rate

Update every 1.31 ms

Bank switching

Manual bank selection is enabled

Biquad coefficients

Set to all pass

Input mixer coefficients

Input N

→ Channel N, no attenuation

Output mixer coefficients

Channel N

→ Output N, no attenuation

Subwoofer sum into Ch1 and Ch2

Gain of 0

Ch1 and Ch2 sum in subwoofer

Gain of 0

Bass and treble bypass/inline

Bypass

DRC bypass/inline

Bypass

DRC

Default values

Master volume

Mute

Individual channel volumes

0 dB

All bass and treble indexes

0 dB

Treble filter sets

Filter set 3

Bass filter sets

Filter set 3

Loudness

Loudness disabled, default values

AM interference mode enable

Disabled

AM interference mode IF

455 kHz

AM interference mode select sequence

AM interference mode tuned frequency and

0000, BCD

input mode

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.

7.3.6.2.2

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.

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