TAS5705PAPR datasheet(42/71 Pages) TI

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Lf(Ch1)

Rf(Ch2)

Ls(Ch3)

Rs(Ch4)

Sub(Ch6)

10dB

BassManagementOutput

BassManagementOutput=BS_Out(linear)=Ch6=F

3.121+(A +B+C+D)

BS_Out(log)=20

log(BS_Out)

B0291-01

BANK SWITCHING

TAS5705

SLOS549 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com

The Bass Management function is explained in Figure 48.

NOTE: Selection of A, B, C, D, or F is determined by the input multiplexer selection register (0x20).

Figure 48. Bass Management Block Diagram

Downmix is defined by I2C register 0x21, bits (3:0), as listed in Table 5.

Table 5. Downmix Definitions

Bits 3:0

Definition

X0X0

L' = (0.000 × Ls + 0.000 × L) / 1.000

X0X1

L' = (0.000 × Ls + 1.000 × L) / 1.000

X1X0

L' = (1.000 × Ls + 0.000 × L) / 1.000

X1X1

L' = (0.707 × Ls + 1.000 × L) / 1.707

0X0X

R' = (0.000 × Rs + 0.000 × R) / 1.000

0X1X

R' = (0.000 × Rs + 1.000 ×R) / 1.000

1X0X

R' = (1.000 × Rs + 0.000 × R) / 1.000

1X1X

R' = (0.707 × Rs + 1.000 × R) / 1.707

The TAS5705 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 the TAS5705. The

TAS5705 has three full banks storing information, one for 32 kHz, one for 44.1/48 kHz, and one for all other data

rates. Combined with the clock-rate autodetection feature, bank switching allows the TAS5705 to detect

automatically a change in the input sample rate and switch to the appropriate bank without any MCU

intervention.

The TAS5705 supports three banks of coefficients to be updated during the initialization. One bank is for 32 kHz,

a second bank is for 44.1/48 kHz, and a third bank is for all other sample rates. An external controller updates

the three banks (see the I2C register mapping table for bankable locations) during the initialization sequence.

If the autobank switch is enabled (register 0x50, bits 2:0) , then the TAS5705 automatically swaps the

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

sample rate change.

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