TAS2564 datasheet(34/118 Pages) TI1

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ICLA

CALC

LIMITER

ATTACK/

RELEASE

ICLA_EN

LIMITER

ICLA_MODE

BOP ATTACK/

RELEASE

LIM_MAX_ATN

ATTNUATION

APPLIED

BOP

ATTN

LIMITER

ATTACK/

RELEASE

LIM_MAX_ATN

PUBLISHED ON

ICLA

BOP ACTIVE PHASE (BOP_*$,1 • 0dB)

PAUSE LIMITER UPDATES

VBATT<BOP_TH

ICLA

TAS2564

SLASEI6A – OCTOBER 2019 – REVISED DECEMBER 2019

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Product Folder Links: TAS2564

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Table 49. PCM Digital Volume Control

DVC_PCM[31:0]

VOLUME (dB)

0x0000 0D43 (MIN)

-110

...

0x4000 0000

0 (default)

...

0x5092 BEE4 (MAX)

Table 50. Digital Volume Ramp Rate

DVC_RAMP[31:0]

RAMP RATE @ 48kHz (s)

0x0000 0D43

...

0x7FFC 963B

1 s

8.4.2.3 Auto-Mute During Idle Channel Mode

Device will stop playing audio if the input audio level drops below the programmable threshold for a

programmable timer window. If this behavior is not preferred, threshold level can be kept at very low levels.

8.4.2.4 Auto-Start/Stop on Audio Clocks

The TAS2564 can enter low power software shutdown when the TDM clocks are stopped instead of going into

clock error. The device will resume operation when the clocks resume.

8.4.2.5 Supply Tracking Limiters with Brown Out Prevention

The TAS2564 monitors battery voltage (VBAT) and along with the audio signal to automatically decrease gain

when the audio signal peaks exceed a programmable threshold. This helps prevent clipping and extends

playback time through end of charge battery conditions. The limiters threshold can be configured to track the

monitored voltage below a programmable inflection point with a programmable slope. A minimum threshold sets

the limit of threshold reduction from the voltage tracking. Configurable attack rate, hold time and release rate are

provided to shape the dynamic response of each limiter. If the ICLA is enabled the actual attenuation is based on

the ICLA configuration using the calculated attenuation value of all devices on the selected ICLA bus.

Figure 37. Limiter and Brown Out Prevention Interaction Diagram

A Brown Out Prevention (BOP) feature provides a priority input to provide a fast response to transient dips in the

battery supply (VBAT) which at end of charge conditions that can cause system level brown out. When the

selected supply dips below the brown-out threshold the BOP will begin reducing gain at a configurable attack

rate. When the VBAT supply rises above the brownout threshold, the BOP will begin to release after the

programmed hold time. During a BOP event the limiter updates will be paused. This is to prevent a limiter from

releasing during a BOP event. The VBAT limiter is enabled by setting the LIMB_EN bit high.

TAS2564 Datasheet(PDF) 34 Page - Texas Instruments

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