IC DGTL AUDIO PWM PROC 64-TQFP

TAS5508APAG

Manufacturer Part NumberTAS5508APAG
DescriptionIC DGTL AUDIO PWM PROC 64-TQFP
ManufacturerTexas Instruments
TypePWM Processor
TAS5508APAG datasheet
 


Specifications of TAS5508APAG

ApplicationsDVDMounting TypeSurface Mount
Package / Case64-TQFP, 64-VQFPFor Use WithTAS5342DDV6EVM - TAS5342DDV6EVMTAS5508-5142K7EVM - EVAL MODULE FOR TAS5508B/TAS5142TAS5508-5122C6EVM - EVAL MODULE FOR TAS5508B/TAS5122TAS5508-5121K8EVM - EVAL MODULE FOR TAS5508B/TAS5121
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names296-17475
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TAS5508A
8-Channel Digital Audio PWM Processor
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
3.2.3 Back-End Error (BKND_ERR)
Back-end error is used to provide error management for back-end error conditions. Back-end error is a
level-sensitive signal. Back-end error can be initiated by bringing the BKND_ERR terminal low for a
minimum 5 MCLK cycles. When BKND_ERR is brought low, the PWM sets either six or eight channels
into the PWM back-end error state. This state is described in
sequence is initiated, a delay of 5 ms is performed before the system starts the output re-initialization
sequence. After the initialization time, the TAS5508A begins normal operation. Back-end error does not
affect other PWM modulator operations.
The number of channels that are affected by the BKND_ERR signal depends on the 6-channel
configuration signal. If the I
outputs in the PWM back-end error state, while not affecting any other internal settings or operations. If
2
the I
Csetting six configuration is true, the TAS5508A brings the PWM outputs 1–6 to a back-end error
state, while not affecting any other internal settings or operations.
signal states during back-end error.
3.2.3.1 BKND_ERR and VALID
The number of channels that are affected by the BKND_ERR signal depends on the setting of bit D1 of
2
2
I
C register 0xE0. If the I
C setting is 0 (8-channel mode), the TAS5508B places all eight PWM outputs in
the PWM back-end error state. If the I
operation in 6-channel mode, the line-out configuration registers (0x09 and 0x0A) must be 0x00 instead of
the default of 0xE0. In this case, VALID is pulled LOW, and the TAS5508B brings PWM outputs 1,2,3,4,7,
and 8 to a back-end error state, while not affecting line-out channels 5 and 6.
output signal states during back-end error.
3.2.4 Speaker/Headphone Selector (HP_SEL)
The HP_SEL terminal enables the headphone output or the speaker outputs. The headphone output
receives the processed data output from DAP and PWM channels 1 and 2.
In 6-channel configuration, this feature does not affect the two lineout channels.
When low, the headphone output is enabled. In this mode, the speaker outputs are disabled. When high,
the speaker outputs are enabled and the headphone is disabled.
Changes in the pin logic level result in a state change sequence using soft mute to the hard mute (M)
state for both speaker and headphone followed by a soft unmute.
When HP_SEL is low, the configuration of channels 1 and 2 is defined by the headphone configuration
register. When HP_SEL is high, the channel-1 and -2 configuration registers define the configuration of
channels 1 and 2.
46
TAS5508A Controls and Status
2
C setting 6-channel configuration is false, the TAS5508A places all eight PWM
Table 3-4. Device Outputs During Back-End Error
SIGNAL
SIGNAL STATE
Valid
PWM P-outputs
M-state – low
PWM M-outputs
M-state – low
HPPWM P-outputs
M-state – low
HPPWM M-outputs
M-state – low
SDA
Signal input (not driven)
2
C setting is 1, the TAS5508B is in 6-channel mode. For proper
Section
2.12. Once the back-end error
Table 3-4
shows the device output
Low
Table 3-4
shows the device
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