TAS5548DCAR datasheet(83/116 Pages) TI1

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TAS5548

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SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

7.6.2.34 PSVC Volume Biquad Register (0xCF)

Each gain coefficient is in 28-bit (5.23) format, so 0x80 0000 is a gain of 1. Each gain coefficient is written as a

32-bit word with the upper four bits not used. Note that this register should be used only with the PSVC feature

its use is not required. For systems not using this feature, it is recommended that this biquad be set to all-pass

(default).

Table 57. Volume Biquad Register Format (Default = All-Pass)

DEFAULT GAIN COEFFICIENT VALUES

DESCRIPTION

DECIMAL

HEX

bo coefficient

u[31:28], b0[27:24], b0[23:16], b0[15:8], b0[7:0]

1.0

0080 0000

b1 coefficient

u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0]

0.0

0000 0000

b2 coefficient

u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0]

0.0

0000 0000

a1 coefficient

u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0]

0.0

0000 0000

a2 coefficient

u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0]

0.0

0000 0000

7.6.2.35 Volume, Treble, and Bass Slew Rates Register (0xD0)

Volume Gain Update Rate (Slew Rate)

D31

D30

D29–D11

D10

FUNCTION

512 step update at 4 Fs, 21.3 ms at 96 kHz

1024 step update at 4 Fs, 42.65 ms at 96 kHz

2048 step update at 4 Fs, 85 ms at 96 kHz

256 step update at 4 Fs, 10.65 ms at 96kHz

Abort volume ramp if there is a change in the volume of any

channel

Enable PWM shutdown on headphone change

Table 58. Treble and Bass Gain Step Size (Slew Rate)

FUNCTION

No operation

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

Updates every 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.

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

Note: Once the volume command is given, no I2C commands should be issued until volume ramp has finished.

The lock out time is 1.5 × slew rate or defined in 0xD0

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