TAS5508C
SLES257–SEPTEMBER 2010
www.ti.com
Ideal Input
Possible Outputs
Desired Output
Values Retained by
Overflow Bits
Overflow
Maximum Signal Amplitude
Filter
Operation
Reduced
SNR
Signal
Output
Signal
Bits
Output
Signal
Bits
Input
Noise Floor With No
Additional Precision
Noise Floor as a Result
of Additional Precision
M0010-01
Figure 2-10. TAS5508C Digital Audio Processing
2.4 Input Crossbar Mixer
The TAS5508C 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.
Gain Coefficient
28
48
SDIN1-L
48
Gain Coefficient
28
48
48
48
SDIN1-R
SUM
w
w
w
48
Gain Coefficient
28
SDIN4-R
M0011-01
Figure 2-11. Input Crossbar Mixer
2.5 Biquad Filters
For 32-kHz to 96-kHz data, the TAS5508C provides 56 biquads across the eight channels (seven per
channel).
For 176.4-kHz and 192-kHz data, the TAS5508C has 21 biquads across the three channels (seven per
channel). All of the biquad filters are second-order direct form I structure.
28
Description
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