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TAS5508APAGG4 Datasheet(PDF) 27 Page - Texas Instruments

Part No. TAS5508APAGG4
Description  8 Channel Digital Audio PWM Processor
Download  99 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TAS5508APAGG4 Datasheet(HTML) 27 Page - Texas Instruments

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Introduction
19
SLES119 − September 2004
TAS5508A
1.7
Biquad Filters
For 32-kHz to 96-kHz data, the TAS5508A provides 56 biquads across the eight channels (seven per channel)
For 176.4-kHz and 192-kHz data, the TAS5508A 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). The 76-bit ALU in the TAS5508A allows the 76-bit
resolution to be retained when summing the mixer outputs (filter products).
The five 28-bit coefficients for the each of the 56 biquads are programmable via the I2C interface. See
Table 1−3.
76
b
0
28
48
X
76
b
1
28
48
X
76
b
2
28
48
X
Z−1
Z−1
76
48
Magnitude
Truncation
Z−1
Z−1
48
1
28
76
X
a
48
2
28
76
X
a
76
b
0
28
48
X
X
76
b
1
28
48
X
76
b
2
28
48
X
Z−1
Z−1
Z−1
Z−1
76
48
Magnitude
Truncation
Z−1
Z−1
Z−1
Z−1
Z−1
Z−1
48
1
28
76
X
a
48
2
28
76
X
a
Figure 1−15. Biquad Filter Structure
All five coefficients for one biquad filter structure are written to one I2C register containing 20 bytes (or five
32-bit words). The structure is the same for all biquads in the TAS5508A. Registers 0x51 – 0x88 show all the
biquads in the TAS5508A. Note that u(31:28) bits are unused and default to 0x0.
Table 1−3. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)
DESCRIPTION
REGISTER FIELD CONTENTS
INITIALIZATION GAIN COEFFICIENT VALUE
DECIMAL
HEX
bo Coefficient
u(31:28), b0(27:24), b0(23:16), b0(15:8), b0(7:0)
1.0
0x00, 0x80, 0x00, 0x00
b1 Coefficient
u(31:28), b1(27:24), b1(23:16), b1(15:8), b1(7:0)
0.0
0x00, 0x00, 0x00, 0x00
b2 Coefficient
u(31:28), b2(27:24), b2(23:16), b2(15:8), b2(7:0)
0.0
0x00, 0x00, 0x00, 0x00
a1 Coefficient
u(31:28), a1(27:24), a1(23:16), a1(15:8), a1(7:0)
0.0
0x00, 0x00, 0x00, 0x00
a2 Coefficient
u(31:28), a2(27:24), a2(23:16), a2(15:8), a2(7:0)
0.0
0x00, 0x00, 0x00, 0x00
1.8
Bass and Treble Controls
From 32-kHz to 96-kHz data, the TAS5508A has four Bass and Treble tone controls. Each control has a
±18-dB control range with selectable corner frequencies and 2nd order slopes. These controls operate four
channel groups:
L, R & C (Channels 1, 2, and 7)
LS, RS (Channels 3 and 4)
LBS, RBS (or alternately called L and R Lineout.) (Channels 5 and 6)
Sub (Channel 8)
For 176.4 kHz and 192 kHz data, the TAS5508A has two Bass and Treble tone controls. Each control has a
±18-dB I2C control range with selectable corner frequencies and 2nd order slopes. These controls operate
two channel groups:


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