参数资料
型号: TAS5508PAGR
厂商: TEXAS INSTRUMENTS INC
元件分类: 消费家电
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封装: GREEN, PLASTIC, TQFP-64
文件页数: 27/105页
文件大小: 1286K
代理商: TAS5508PAGR
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
48
SDIN1-L
28
48
Gain Coefficient
48
28
48
SUM
w
Gain Coefficient
48
28
48
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
28
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