TAS5504_06 datasheet(86/96 Pages) TI

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Serial Control Interface Register Definitions

SLES123 − October 2004

TAS5504

6.27 Volume Biquad Register (0xCF)

Each gain coefficient is in 28-bit (5.23) format so 0x800000 is a gain of 1. Each gain coefficient is written as

a 32-bit word with the upper four bits not used.

Table 6−32. Volume Biquad Register Format (Default = All-pass)

DESCRIPTION

DEFAULT GAIN COEFFICIENT VALUES

DESCRIPTION

DECIMAL

HEX

bo Coefficient

0U (31:28), b0 (27:24), b0 (23:16), b0 (15:8), b0 (7:0)

1.0

0x00, 0x80, 0x00, 0x00

b1 Coefficient

U (31:28), b1 (27:24), b1 (23:16), b1 (15:8), b1 (7:0)

0.0

0x00, 0x00, 0x00, 0x00

b2 Coefficient

U (31:28), b2 (27:24), b2 (23:16), b2 (15:8), b2 (7:0)

0.0

0x00, 0x00, 0x00, 0x00

a1 Coefficient

0U (31:28), a1 (27:24), a1 (23:16), a1 (15:8), a1 (7:0)

0.0

0x00, 0x00, 0x00, 0x00

a2 Coefficient

U (31:28), a2 (27:24), a2 (23:16), a2 (15:8), a2 (7:0)

0.0

0x00, 0x00, 0x00, 0x00

6.28 Volume Treble and Bass Slew Rates (0xD0)

Table 6−33. Volume Gain Update Rate (Slew Rate)

D31−D10

FUNCTION

512 step update at 4 Fs, 42.6 ms at 48 kHz

1024 step update at 4 Fs, 85.3 ms at 48 kHz

2048 step update at 4 Fs, 170 ms at 48 kHz

Table 6−34. Treble and Bass Gain Step Size (Slew Rate)

FUNCTION

No operation

Minimum rate – Updates every 0.083 ms (every LRCLK at 48 kHz)

Update ever 0.67 ms (32 LRCLKs at 48 kHz)

Default rate − Updates every 1.31 ms (63 LRCLKs at 48 kHz). This is the

maximum constant time that can be set for all sample rates.

Minimum rate – Updates every 5.08 ms (every 255 LRCLKs at 48 kHz)

6.29 Volume Registers (0xD1, 0xD2, 0xD7, and 0xD8)

Channels 1, 2, 3, and 4 are mapped into registers 0xD1, 0xD2, 0xD7, and 0xD8.

Master volume is mapped into register 0xD9.

Bits D31 − D12 are Don’t Care.

Table 6−35. Volume Registers

D31

D30

D29

D28

D27

D26

D25

D24

FUNCTION

Unused bits

D23

D22

D21

D20

D19

D18

D17

D16

FUNCTION

Unused bits

D15

D14

D13

D12

D11

D10

FUNCTION

V11

V10

Volume

FUNCTION

Volume

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