TAS5721 datasheet(28/78 Pages) TI1

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–1

AlphaFilterStructure

B0265-01

Energy

Filter

a w

T,K,O

DRC1

DRC2

0x3A

0x40,0x41,0x42

0x3B/0x3C

0x3E/0x3F

0x43,0x44,0x45

0x3D

Compression

Control

Attack

and

Decay

Filters

AudioInput

DRCCoefficient

NOTE:

=1 –

TAS5721

SLOS739A – JULY 2012 – REVISED MARCH 2016

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Feature Description (continued)

T = 9.23 format, all other DRC coefficients are 3.23 format

Figure 55. DRC Structure

9.3.11 Bank Switching

The TAS5721 uses an approach called bank switching together with automatic sample-rate detection. All

processing features that must be changed for different sample rates are stored internally in three banks. The

user can program which sample rates map to each bank. By default, bank 1 is used in 32-kHz mode, bank 2 is

used in 44.1- or 48-kHz mode, and bank 3 is used for all other rates. Combined with the clock-rate autodetection

feature, bank switching allows the TAS5721 to detect automatically a change in the input sample rate and switch

to the appropriate bank without any MCU intervention.

An external controller configures bankable locations (0x29-0x36, 0x3A-0x3F, and 0x58-0x5F) for all three banks

during the initialization sequence.

If auto bank switching is enabled (register 0x50, bits 2:0) , then the TAS5721 automatically swaps the coefficients

for subsequent sample rate changes, avoiding the need for any external controller intervention for a sample rate

change.

By default, bits 2:0 have the value 000; indicating that bank switching is disabled. In that state, updates to

bankable locations take immediate effect. A write to register 0x50 with bits 2:0 being 001, 010, or 011 brings the

system into the coefficient-bank-update state update bank1, update bank2, or update bank3, respectively. Any

subsequent write to bankable locations updates the coefficient banks stored outside the DAP. After updating all

the three banks, the system controller should issue a write to register 0x50 with bits 2:0 being 100; this changes

the system state to automatic bank switching mode. In automatic bank switching mode, the TAS5721

automatically swaps banks based on the sample rate.

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