Datasheet

TAS5548
SLES270 –NOVEMBER 2012 www.ti.com
Because RESET is an asynchronous signal, clicks and pops produced during the application (the leading
edge) of RESET cannot be avoided. However, the transition from the hard-mute state (Non PWM
Switching) to the operational state is performed using a quiet start-up sequence to minimize noise. This
control uses the PWM reset and unmute sequence to shut down and start up the PWM. If a completely
quiet reset or power-down sequence is desired, MUTE should be applied before applying RESET.
The rising edge of the reset pulse begins device initialization before the transition to the operational mode.
During device initialization, all controls are reset to their initial states. Table 5-2 shows the default control
settings following a reset.
Table 5-2. 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 I
2
S, 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 1
AM interference mode tuned frequency and 0000, BCD
input mode
36 TAS5548 Controls and Status Copyright © 2012, Texas Instruments Incorporated
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