TAS5508 datasheet(28/105 Pages) TI

28 / 105 page

Noise Floor With No

Additional Precision

Maximum Signal Amplitude

Ideal Input

Possible Outputs

Desired Output

Filter

Operation

Signal

Bits

Input

Overflow

Reduced

SNR

Signal

Output

Noise Floor as a Result

of Additional Precision

Signal

Bits

Output

Values Retained by

Overflow Bits

M0010-01

2.4

Input Crossbar Mixer

Gain Coefficient

SDIN1-L

Gain Coefficient

SUM

Gain Coefficient

M0011-01

SDIN1-R

SDIN4-R

2.5

Biquad Filters

TAS5508

8-Channel Digital Audio PWM Processor

SLES091D – FEBRUARY 2004 – REVISED JULY 2009

www.ti.com

Figure 2-10. TAS5508 Digital Audio Processing

The TAS5508 has a full 8

＝8 input crossbar mixer. This mixer permits each signal processing channel

input to be any ratio of any of the eight input channels, as shown in Figure 2-11. The control parameters

for the input crossbar mixer are programmable via the I2C interface. See the Input Mixer Registers

(0x41–0x48, Channels 1–8), Section 7.16, for more information.

Figure 2-11. Input Crossbar Mixer

For 32-kHz to 96-kHz data, the TAS5508 provides 56 biquads across the eight channels (seven per

channel).

For 176.4-kHz and 192-kHz data, the TAS5508 has 21 biquads across the three channels (seven per

channel). All of the biquad filters are second-order direct form I structure.

The direct form I structure provides a separate delay element and mixer (gain coefficient) for each node in

the biquad filter. Each mixer output is a signed 76-bit product of a signed 48-bit data sample (25.23 format

number) and a signed 28-bit coefficient (5.23 format number), as shown in Figure 2-12. The 76-bit ALU in

the TAS5508 allows the 76-bit resolution to be retained when summing the mixer outputs (filter products).

Description

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