TAS5508 datasheet(24/105 Pages) TI

24 / 105 page

Biquads

Series

Bass

and

Treble

Loudness

DRC

Input

Mixer

1 Other

Channel Output

From 7 Available

32-Bit

Trunc

PWM

Proc

A_to_ipmix

B_to_ipmix

SDIN1

C_to_ipmix

D_to_ipmix

SDIN2

Left

Right

Channel Volume

Bass and Treble

Bypass

Bass

and

Treble

Inline

Pre-

Volume

Post-

Volume

Output

Gain

Output Mixer Sums

Any Two Channels

PWM

Output

Left

Right

DRC

Bypass

DRC

Inline

E_to_ipmix

F_to_ipmix

SDIN3

G_to_ipmix

H_to_ipmix

SDIN4

Left

Right

Left

Right

B0016-01

Master

Volume

Max

Volume

2.3.2

2C Coefficient Number Formats

2.3.2.1 28-Bit 5.23 Number Format

TAS5508

8-Channel Digital Audio PWM Processor

SLES091D – FEBRUARY 2004 – REVISED JULY 2009

www.ti.com

Figure 2-3. TAS5508 Detailed Channel Processing

The architecture of the TAS5508 is contained in ROM resources within the TAS5508 and cannot be

altered. However, mixer gain, level offset, and filter tap coefficients, which can be entered via the I2C bus

interface, provide a user with the flexibility to set the TAS5508 to a configuration that achieves

system-level goals.

The firmware is executed in a 48-bit, signed, fixed-point arithmetic machine. The most significant bit of the

48-bit data path is a sign bit, and the 47 lower bits are data bits. Mixer gain operations are implemented

by multiplying a 48-bit, signed data value by a 28-bit, signed gain coefficient. The 76-bit, signed output

product is then truncated to a signed, 48-bit number. Level offset operations are implemented by adding a

48-bit, signed offset coefficient to a 48-bit, signed data value. In most cases, if the addition results in

overflowing the 48-bit, signed number format, saturation logic is used. This means that if the summation

results in a positive number that is greater than 0x7FFF FFFF FFFF (the spaces are used to ease the

reading of the hexadecimal number), the number is set to 0x7FFF FFFF FFFF. If the summation results in

a negative number that is less than 0x8000 0000 0000, the number is set to 0x8000 0000 0000.

All mixer gain coefficients are 28-bit coefficients using a 5.23 number format. Numbers formatted as 5.23

numbers have 5 bits to the left of the binary point and 23 bits to the right of the binary point. This is shown

in Figure 2-4.

Description

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