Datasheet

TAS5508C
SLES257–SEPTEMBER 2010 www.ti.com
Table 3-1. Device Outputs During Reset (continued)
SIGNAL SIGNAL STATE
SDA Signal input (not driven)
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 (M) 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. A detailed description of these
sequences is contained in the PWM section. 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 3-2 shows the default control
settings following a reset.
Table 3-2. Values Set During Reset
CONTROL SETTING
Clock register Not valid
High pass Disabled
Unmute from clock error Hard unmute
PSVC Hi-Z Disabled
Post DAP detection automute Enabled
Eight Ch PreDAP detection automute Enabled
De-emphasis De-emphasis disabled
Channel configuration control Configured for the default setting
Headphone configuration control Configured for the default setting
Serial data interface format I
2
S 24 bit
Individual channel mute No channels are muted
Automute delay 5 ms
Automute threshold 1 < 8 bits
Automute threshold 2 Same as automute threshold 1
Modulation limit Maximum modulation limit of 97.7%
Six- (or eight – low) channel configuration Eight channels
Slew rate limit Disengaged for all channels
Interchannel delay –32, 0, –16, 16, –24, 8, –8, –24
Shutdown PWM on error Enabled
Volume and mute update rate Volume ramp 85 ms
Treble and bass slew rate Update every 1.31 ms
Bank switching Manual bank selection is enabled
Auto bank switching map All channels use bank 1
Biquad coefficients (5508) 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 (5508) Gain of 0
Ch1 and Ch2 sum in subwoofer (5508) Gain of 0
Bass and treble bypass Gain of 1
Bass and treble inline Gain of 0
DRC bypass (5508) Gain of 1
DRC inline (5508) Gain of 0
DRC (5508) DRC disabled, default values
44 TAS5508C Controls and Status Copyright © 2010, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): TAS5508C