TAS5508C Datasheet, PDF (85/107 Pages) Texas Instruments – 8-Channel Digital Audio PWM Processor

TAS5508C
www.ti.com
SLES257 – SEPTEMBER 2010
Each gain coefficient is in 28-bit (5.23) format so 0x80 0000 is a gain of 1. Each gain coefficient is written
as a 32-bit word with the upper four bits not used.
Table 7-19. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)
DESCRIPTION
REGISTER FIELD CONTENTS
b₀ coefficient
b₁ coefficient
b₂ coefficient
a₁ coefficient
a₂ coefficient
u[31:28], b0[27:24], b0[23:16], b0[15:8], b0[7:0]
u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0]
u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0]
u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0]
u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0]
DEFAULT GAIN COEFFICIENT VALUES
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
7.19 Bass and Treble Bypass Register, Channels 1–8 (0x89–0x90)
Channels 1, 2, 3, 4, 5, 6, 7, and 8 are mapped into registers 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
and 0x90, respectively. Eight bytes are written for each channel. Each gain coefficient is in 28-bit (5.23)
format so 0x80 0000 is a gain of 1. Each gain coefficient is written as a 32-bit word with the upper four bits
not used.
Table 7-20. Channel 1–8 Bass and Treble Bypass Register Format
REGISTER
NAME
Channel bass and
treble bypass
Channel bass and
treble inline
TOTAL
BYTES
CONTENTS
u[31:28], bypass[27:24], bypass[23:16], bypass[15:8], bypass[7:0]
8
u[31:28], inline[27:24], inline[23:16], inline[15:8], inline[7:0]
INITIALIZATION VALUE
0x00, 0x80, 0x00, 0x00
0x00, 0x00, 0x00, 0x00
7.20 Loudness Registers (0x91–0x95)
Table 7-21. Loudness Register Format
I²C SUB- TOTAL
ADDRESS BYTES
REGISTER NAME
0x91
4 Loudness Log2 gain (LG)
0x92
Loudness Log2 offset (LO)
8
Loudness Log2 LO
0x93
4 Loudness gain (G)
0x94
Loudness offset upper
16 bits (O)
8
Loudness O offset lower 32
bits (O)
0x95
Loudness biquad (b₀)
Loudness biquad (b₁)
20 Loudness biquad (b₂)
Loudness biquad (a₁)
Loudness biquad (a₂)
DESCRIPTION OF CONTENTS
u[31:28], LG[27:24], LG[23:16], LG[15:8], LG[7:0]
u[31:24], u[23:16], LO[15:8], LO[7:0]
LO[31:24], LO[23:16], LO[15:8], LO[7:0]
u[31:28], G[27:24], G[23:16], G[15:8], G[7:0]
u[31:24], u[23:16], O[15:8], O[7:0]
O[31:24], O[23:16], O[15:8], O[7:0]
u[31:28], b0[27:24], b0[23:16], b0[15:8], b0[7:0]
u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0]
u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0]
u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0]
u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0]
DEFAULT STATE
0xFF, 0xC0, 0x00, 0x00
0x00, 0x00, 0x00, 0x00
0x00, 0x00, 0x00, 0x00
0x00, 0x00, 0x00, 0x00
0x00, 0x00, 0x00, 0x00
0x00, 0x00, 0x00, 0x00
0x00, 0x00, 0xD5, 0x13
0x00, 0x00, 0x00, 0x00
0x0F, 0xFF, 0x2A, 0xED
0x00, 0xFE, 0x50, 0x45
0x0F, 0x81, 0xAA, 0x27
Copyright © 2010, Texas Instruments Incorporated
Serial-Control Interface Register Definitions
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