Datasheet

TLV320AIC3107

SLOS545D –NOVEMBER 2008 –REVISED DECEMBER 2014

www.ti.com

Because of soft-stepping, the host does not know when the DAC has been actually muted. This may be

important if the host wishes to mute the DAC before making a significant change, such as changing sample

rates. In order to help with this situation, the device provides a flag back to the host via a read-only register bit

that alerts the host when the part has completed the soft-stepping and the actual volume has reached the

desired volume level. The soft-stepping feature can be disabled through register programming. If soft-stepping is

enabled, the MCLK signal should be kept applied to the device until the DAC power-down flag is set. When this

flag is set, the internal soft-stepping process and power down sequence is complete, and the MCLK can then be

stopped if desired.

The TLV320AIC3107 also includes functionality to detect when the user switches on or off the de-emphasis or

digital audio processing functions, to first (1) soft-mute the DAC volume control, (2) change the operation of the

digital effects processing, and (3) soft-unmute the part. This avoids any possible pop/clicks in the audio output

due to instantaneous changes in the filtering. A similar algorithm is used when first powering up or down the

DAC. The circuit begins operation at power up with the volume control muted, then soft-steps it up to the desired

volume level. At power down, the logic first soft-steps the volume down to a mute level, then powers down the

circuitry.

10.3.3.3.5 Increasing DAC Dynamic Range

The TLV320AIC3107 allows trading off dynamic range with power consumption. The DAC dynamic range can be

increased by writing to Page 0, Register 109 bits D7-D6. The lowest DAC current setting is the default, and the

dynamic range is displayed in the datasheet table. Increasing the current can increase the DAC dynamic range

by up to 1.5dB.

10.3.3.3.6 Analog Output Common-Mode Adjustment

The output common-mode voltage and output range of the analog output are determined by an internal bandgap

reference, in contrast to other codecs that may use a divided version of the supply. This scheme is used to

reduce the coupling of noise that may be on the supply (such as 217-Hz noise in a GSM cellphone) into the

audio signal path.

However, due to the possible wide variation in analog supply range (2.7 V – 3.6 V), an output common-mode

voltage setting of 1.35 V, which would be used for a 2.7 V supply case, will be overly conservative if the supply is

actually much larger, such as 3.3 V or 3.6 V. In order to optimize device operation, the TLV320AIC3107 includes

a programmable output common-mode level, which can be set by register programming to a level most

appropriate to the actual supply range used by a particular customer. The output common-mode level can be

varied among four different values, ranging from 1.35 V (most appropriate for low supply ranges, near 2.7 V) to

1.8 V (most appropriate for high supply ranges, near 3.6 V). Note that there is also some limitation on the range

of DVDD voltage as well in determining which setting is most appropriate.

Table 5. Appropriate Settings

CM SETTING RECOMMENDED AVDD_DAC, RECOMMENDED DVDD

DRVDD

1.35 2.7 V – 3.6 V 1.525 V – 1.95 V

1.50 3.0 V – 3.6 V 1.65 V – 1.95 V

1.65 V 3.3 V – 3.6 V 1.8 V – 1.95 V

1.8 V 3.6 V 1.95 V

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