TAS5548DCAR datasheet(34/116 Pages) TI1

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GainCoefficient

SDIN1-L

GainCoefficient

SUM

GainCoefficient

M0011-01

SDIN1-R

SDIN4-R

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

TAS5548

SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

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Figure 31. TAS5548 Digital Audio Processing

7.4.11 Input Crossbar Mixer

The TAS5548 has a full 10×8 input crossbar mixer. This mixer permits each signal-processing channel input to

be any mix of any of the eight input channels, as shown in Figure 32. The control parameters for the input

crossbar mixer are programmable via the I2C interface. See Input Mixer Registers, Channels 1–8 (0x41–0x48)

for more information.

Figure 32. Input Crossbar Mixer

7.4.12 Biquad Filters

For 32-kHz to 96-kHz data, the TAS5548 provides 56 biquads across the eight channels (seven per channel).

For 176.4-kHz and 192-kHz data, the TAS5548 has 22 biquads with channels 1 and 2 having 5 biquads each,

and channels 7 and 8 having 6 biquads each.

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 60-bit product of a signed 32-bit data sample (9.23 format number)

and a signed 28-bit coefficient (5.23 format number), as shown in Figure 33. The 60-bit ALU in the TAS5548

allows the 60-bit resolution to be retained when summing the mixer outputs (filter products). All of the biquad

filters are second-order direct form I structure.

The five 28-bit coefficients for the each of the 56 biquads are programmable via the I2C interface. See Table 7.

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