TAS2020 datasheet(25/79 Pages) TI2

25 / 79 page

To achieve a limiter that tracks the selected supply below a threshold, configure the limiter as explained in the

previous example, except program the LIM_TH_MIN[23:0] register to the desired minimum threshold. This is

shown in Figure 6-6 below.

Figure 6-6. Limiter with Inflection Point and Minimum Threshold

The limiter has a configurable attack rate (dB/Sample), hold time ( no of samples) and release rate (db/Sample),

which are available via the LIM_ATK_RATE[23:0], LIM_HLD_COUNT[23:0], LIM_RLS_RATE[23:0] register bits.

6.4.2.5 Tone Generator

TAS2020 can generate internally a sine tone using an integrated tone generator. This feature can be enabled

by configuring the register bit INTERNAL_TONE_GEN_ENZ to low. The tone signal will start playing back on

the output by configuring the INTERNAL_TONE_PLAYBACK_EN bit high. When set high, the device will start

generating a sine tone based on the programmed TONE_GEN_CNTRL_xx registers. The tone generator can

generate any frequency from 16Hz to a maximum frequency of 0.45*Fs, where Fs is the sampling rate of the

input digital clocks. The amplitude of the tone signal can also be controlled using the TONE_GEN_CNTRL_xx

registers. It is recommended to program the tone frequency and amplitude using the PPC3 Software.

The internally generated tone can be mixed with incoming audio stream, or can replace the input audio stream

and only tone signal is generated using INTERNAL_TONE_MIXING_EN register.

Table 6-20. Internal tone generator mixing options

INTERNAL_TONE_MIXING_EN

Configuration

Only internal tone is generated.

1(default)

Internally generated tone is mixed

with input audio data and played

together.

The tone generator can use external clock source like BCLK, or it can be generated using internal oscillator to

generate tone signals even with no external clock sources using INTERNAL_TONE_CLK_SEL register.

Table 6-21. Internal tone clock source selection

INTERNAL_TONE_CLK_SEL

Configuration

0 (default)

Tone generator uses external

clocks

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TAS2020

SLASFD4A – AUGUST 2024 – REVISED JULY 2026

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TAS2020 Datasheet(PDF) 25 Page - Texas Instruments