TLV320AIC3268 Datasheet, PDF (247/263 Pages) Texas Instruments – Low Power Stereo Audio Codec

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Typical Applications (continued)
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TLV320AIC3268
SLAS953A – JANUARY 2014 – REVISED FEBRUARY 2014
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±70 ±60 ±50 ±40 ±30 ±20 ±10
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Input Amplitude (dBFS)
C013
Conditions: Differential Lineout, R_load=10kΩ, CM=0.9V
Figure 113. Total Harmonic Distortion + Noise versus Input Amplitude
9.3 Initialization Setup
The TLV320AIC3268 has multiple power supply domains to support various functions. Before the device is fully
functional, all the power supplies must be enabled. The section Power On Sequence describes the supported
power supply sequencing for TLV320AIC3268.
9.3.1 Power On Sequence
There are two recommended power sequence possible for TLV320AIC3268:
1) Speaker/Microphone Supplies, then Digital Supplies, then Analog Supplies
2) Speaker/Microphone Supplies, then Digital and Analog Supplies
The first power on sequence is useful if the end system uses separate analog and digital supplies. This is useful
to improve the efficiency of the digital rails by using a DC/DC converter, while keeping the analog supplies clean
by using a low-dropout regulator (LDO). While it is recommended to separate analog and digital supplies, if all
the 1.8V supplies (analog and digital) must be tied together, the second power sequence can be utilized.
9.3.1.1 Power On Sequence 1 - Separate Digital and Analog Supplies
Figure 114 shows a timing diagram for the case where all supplies are provided separately. In such case, the
depicted sequence should be used. The dashed lines marked in blue color refer to an internally supplied voltage.
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