TLV320DAC3101 Datasheet, PDF (46/100 Pages) Texas Instruments – Low-Power Stereo Audio DAC With Audio Processing and Stereo Class-D Speaker Amplifier

TLV320DAC3101
SLAS666A – JANUARY 2010 – REVISED MAY 2012
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The TLV320DAC3101 has a short-circuit protection feature for the speaker drivers that is always enabled
to provide protection. If the output is shorted, the output stage shuts down on the overcurrent condition.
(Current limiting is not an available option for the higher-current speaker-driver output stage.) In case of a
short circuit on either channel, the output is disabled and a status flag is provided as a read-only bit on
page 1 / register 32, bit D0.
If shutdown occurs due to an overcurrent condition, then the device requires a reset to re-enable the
output stage. Resetting can be done in two ways. First, the device master reset can be used, which
requires either toggling the RESET pin or using the software reset. If master reset is used, it resets all of
the registers. Second, a dedicated speaker power-stage reset can be used that keeps all of the other
device settings. The speaker power-stage reset is done by setting page 1 / register 32, bit D7 for SPLP
and SPLM and by setting page 1 / register 32, bit D6 for SPRP and SPRM. If the fault condition has been
removed, then the device returns to normal operation. If the fault is still present, then another shutdown
occurs. Repeated resetting (more than three times) is not recommended, as this could lead to
overheating.
To minimize battery current leakage, the SPLVDD and SPRVDD voltage levels should not be less
than the AVDD voltage level.
The TLV320DAC3101 has a thermal protection (OTP) feature for the speaker drivers which is always
enabled to provide protection. If the device is overheated, then the output stops switching. When the
device cools down, the device resumes switching. An overtemperature status flag is provided as a read-
only bit on page 0 / register 3, bit D1. The OTP feature is for self-protection of the device. If die
temperature can be controlled at the system/board level, then overtemperature does not occur.
5.5.13 Audio Output-Stage Power Configurations
After the device has been configured (following a RESET) and the circuitry has been powered up, the
audio output stage can be powered up and powered down by register control.
These functions soft-start automatically. By using these register controls, it is possible to control these four
output-stage configuratios independently.
See Table 5-25 for register control of audio output-stage power configurations.
Audio Output Pins
HPL
HPR
SPLP / SPLM
SPRP / SPRM
Table 5-25. Audio-Output Stage-Power Configurations
Desired Function
Power down HPL driver
Power up HPL driver
Power down HPR driver
Power up HPR driver
Power down left class-D drivers
Power up left class-D drivers
Power down right class-D drivers
Power up right class-D drivers
Page 1 / Register, Bit Values
Page 1 / register 31, bit D7 = 0
Page 1 / register 31, bit D7 = 1
Page 1 / register 31, bit D6 = 0
Page 1 / register 31, bit D6 = 1
Page 1 / register 32, bit D7 = 0
Page 1 / register 32, bit D7 = 1
Page 1 / register 32, bit D6 = 0
Page 1 / register 32, bit D6 = 1
5.5.14 DAC Setup
The following paragraphs are intended to guide a user through the steps necessary to configure the
TLV320DAC3101.
Step 1
The system clock source (master clock) and the targeted DAC sampling frequency must be identified.
Depending on the targeted performance, the decimation filter type (A, B, or C) and DOSR value can be
determined:
• Filter A should be used for 48-kHz high-performance operation; DOSR must be a multiple of 8.
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