參數(shù)資料
型號(hào)： TAS5508BPAGRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 25/103頁(yè)
文件大小： 1198K
代理商： TAS5508BPAGRG4
28
48
76
48
b
0
28
48
76
b
1
S
28
48
76
b
2
76
28
76
48
a
1
28
76
48
a
2
M0012-01
z
–1
z
–1
Magnitude
Truncation
z
–1
z
–1
2.6
Bass and Treble Controls
TAS5508B
8-Channel Digital Audio PWM Processor
SLES162C – DECEMBER 2005 – REVISED JULY 2009
www.ti.com
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 TAS5508B 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
Figure 2-12. 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 TAS5508B. Registers 0x51–0x88 show all
the biquads in the TAS5508B. Note that u[31:28] bits are unused and default to 0x0.
Table 2-3. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)
INITIALIZATION GAIN COEFFICIENT VALUE
DESCRIPTION
REGISTER FIELD CONTENTS
DECIMAL
HEX
b0 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
From 32-kHz to 96-kHz data, the TAS5508B has four bass and treble tone controls. Each control has a
±18-dB control range with selectable corner frequencies and second-order slopes. These controls operate
four channel groups:
L, R, and C (channels 1, 2, and 7)
LS, RS (channels 3 and 4)
LBS, RBS (alternatively called L and R lineout) (channels 5 and 6)
Sub (channel 8)
For 176.4-kHz and 192-kHz data, the TAS5508B has two bass and treble tone controls. Each control has
a
±18-dB I2C control range with selectable corner frequencies and second-order slopes. These controls
operate two channel groups:
Description
28
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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