參數資料
型號: TAS5508PAGR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: GREEN, PLASTIC, TQFP-64
文件頁數: 28/105頁
文件大?。?/td> 1286K
代理商: TAS5508PAGR
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
TAS5508
8-Channel Digital Audio PWM Processor
www.ti.com
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
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 TAS5508. Registers 0x51–0x88 show all the
biquads in the TAS5508. 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 TAS5508 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 TAS5508 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:
L and R
Sub
The bass and treble filters use a soft update rate that does not produce artifacts during adjustment.
Description
29
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