IC DGTL AUDIO PWM PROC 64-TQFP

TAS5508APAG

Manufacturer Part NumberTAS5508APAG
DescriptionIC DGTL AUDIO PWM PROC 64-TQFP
ManufacturerTexas Instruments
TypePWM Processor
TAS5508APAG datasheet
 


Specifications of TAS5508APAG

ApplicationsDVDMounting TypeSurface Mount
Package / Case64-TQFP, 64-VQFPFor Use WithTAS5342DDV6EVM - TAS5342DDV6EVMTAS5508-5142K7EVM - EVAL MODULE FOR TAS5508B/TAS5142TAS5508-5122C6EVM - EVAL MODULE FOR TAS5508B/TAS5122TAS5508-5121K8EVM - EVAL MODULE FOR TAS5508B/TAS5121
Lead Free Status / RoHS StatusLead free / RoHS CompliantOther names296-17475
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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
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 I
Table
2-3.
48
–1
z
48
–1
z
48
All five coefficients for one biquad filter structure are written to one I
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 2-3. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)
DESCRIPTION
REGISTER FIELD CONTENTS
b
coefficient
u[31:28], b0[27:24], b0[23:16], b0[15:8], b0[7:0]
0
b
coefficient
u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0]
1
b
coefficient
u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0]
2
a
coefficient
u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0]
1
a
coefficient
u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0]
2
2.6
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 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 TAS5508A has two bass and treble tone controls. Each control has
2
a 18-dB I
C control range with selectable corner frequencies and second-order slopes. These controls
operate two channel groups:
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8-Channel Digital Audio PWM Processor
b
0
28
76
76
S
b
1
28
76
76
b
2
28
76
76
Figure 2-12. Biquad Filter Structure
TAS5508A
SLES119A – FEBRUARY 2004 – REVISED JULY 2009
Figure
2-12. The 76-bit ALU in
2
C interface. See
48
Magnitude
Truncation
a
1
–1
z
28
48
a
2
–1
z
28
48
M0012-01
2
C register containing 20 bytes (or five
INITIALIZATION GAIN COEFFICIENT VALUE
DECIMAL
HEX
1.0
0x00, 0x80, 0x00, 0x00
0.0
0x00, 0x00, 0x00, 0x00
0.0
0x00, 0x00, 0x00, 0x00
0.0
0x00, 0x00, 0x00, 0x00
0.0
0x00, 0x00, 0x00, 0x00
Description
29