Datasheet

TAS5548
www.ti.com SLES270 –NOVEMBER 2012
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 11-26. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)
DEFAULT GAIN COEFFICIENT VALUES
DESCRIPTION REGISTER FIELD CONTENTS
DECIMAL HEX
b
0
coefficient u[31:28], b0[27:24], b0[23:16], b0[15:8], b0[7:0] 1.0 0080 0000
b
1
coefficient u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0] 0.0 0000 0000
b
2
coefficient u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0] 0.0 0000 0000
a
1
coefficient u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0] 0.0 0000 0000
a
2
coefficient u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0] 0.0 0000 0000
11.23 Bass and Treble 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 reserved.
Table 11-27. Channel 1–8 Bass and Treble Bypass Register Format
REGISTER TOTAL
CONTENTS DEFAULT VALUE
NAME BYTES
Channel bass and Bypass 0080 0000
treble bypass
8
Channel bass and Inline 0000 0000
treble inline
11.24 Loudness Registers (0x91–0x95)
Table 11-28. Loudness Register Format
I
2
C SUB- TOTAL
REGISTER NAME DESCRIPTION OF CONTENTS DEFAULT STATE
ADDRESS BYTES
0x91 4 Loudness Log2 gain (LG) u[31:28], LG[27:24], LG[23:16], LG[15:8], LG[7:0] 0FC0 0000
0x92 4 Loudness Log2 offset (LO) LO[31:24], LO[23:16], LO[15:8], LO[7:0] 0000 0000
0x93 4 Loudness gain (G) u[31:28], G[27:24], G[23:16], G[15:8], G[7:0] 0000 0000
Loudness offset lower 32 bits O[31:24], O[23:16], O[15:8], O[7:0] 0000 0000
0x94 4
(O)
Loudness biquad (b
0
) u[31:28], b0[27:24], b0[23:16], b0[15:8], b0[7:0] 00FE 5045
Loudness biquad (b
1
) u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0] 0F81 AA27
0x95 20 Loudness biquad (b
2
) u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0] 0000 D513
Loudness biquad (a
1
) u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0] 0000 0000
Loudness biquad (a
2
) u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0] 0FFF 2AED
Copyright © 2012, Texas Instruments Incorporated Serial-Control Interface Register Definitions 91
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