Datasheet

TLV320DAC3100

www.ti.com

SLAS671A –FEBRUARY 2010–REVISED MAY 2012

5.2.1.5 Software Power Down

By default, all circuit blocks are powered down following a reset condition. Hardware power up of each

circuit block can be controlled by writing to the appropriate control register. This approach allows the

lowest power-supply current for the functionality required. However, when a block is powered down, all of

the register settings are maintained as long as power is still being applied to the device.

5.2.2 Audio Analog I/O

The TLV320DAC3100 has a stereo audio DAC. It supports a wide range of analog interfaces to support

different headsets and analog outputs. The TLV320DAC3100 has features to interface output drivers (8-Ω,

16-Ω, 32-Ω). A special circuit has also been included in the TLV320DAC3100 to insert a short key-click

sound into the stereo audio output. The key-click sound is used to provide feedback to the user when a

particular button is pressed or item is selected. The specific sound of the keyclick can be adjusted by

varying several register bits that control its frequency, duration, and amplitude. See Key-Click Functionality

With Digital Sine-Wave Generator (PRB_P25), Section 5.5.7.

5.3 Digital Processing Low-Power Modes

The TLV320DAC3100 device can be tuned to minimize power dissipation, to maximize performance, or to

an operating point between the two extremes to best fit the application. The choice of processing blocks,

PRB_P1 to PRB_P25 for stereo playback, also influences the power consumption. In fact, the numerous

processing blocks have been implemented to offer a choice among configurations having a different

balance of power optimization and signal-processing capabilities.

5.3.1 DAC Playback on Headphones, Stereo, 48 kHz, DVDD = 1.8 V, AVDD = 3.3 V,

HPVDD = 3.3 V

DOSR = 128, Processing Block = PRB_P7 (Interpolation Filter B)

Power consumption = 24.28 mW

Table 5-1. PRB_P7 Alternative Processing Blocks, 24.28 mW

Processing Block Filter Estimated Power Change (mW)

PRB_P1 A 1.34

PRB_P2 A 2.86

PRB_P3 A 2.11

PRB_P8 B 1.18

PRB_P9 B 0.53

PRB_P10 B 1.89

PRB_P11 B 0.87

PRB_P23 A 1.48

PRB_P24 A 2.89

PRB_P25 A 3.23

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