Datasheet

TAS5548
SLES270 –NOVEMBER 2012 www.ti.com
All five coefficients for one biquad filter structure are written to one I
2
C register containing 20 bytes (or five
32-bit words). The structure is the same for all biquads in the TAS5548. Registers 0x51–0x88 show all the
biquads in the TAS5548. Note that u[31:28] bits are unused and default to 0x0.
Table 3-1. Contents of One 20-Byte Biquad Filter Register (Default = All-Pass)
INITIALIZATION GAIN COEFFICIENT VALUE
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 0x00, 0x80, 0x00, 0x00
b
1
coefficient u[31:28], b1[27:24], b1[23:16], b1[15:8], b1[7:0] 0.0 0x00, 0x00, 0x00, 0x00
b
2
coefficient u[31:28], b2[27:24], b2[23:16], b2[15:8], b2[7:0] 0.0 0x00, 0x00, 0x00, 0x00
a
1
coefficient u[31:28], a1[27:24], a1[23:16], a1[15:8], a1[7:0] 0.0 0x00, 0x00, 0x00, 0x00
a
2
coefficient u[31:28], a2[27:24], a2[23:16], a2[15:8], a2[7:0] 0.0 0x00, 0x00, 0x00, 0x00
3.5 Bass and Treble Controls
In post-SRC 96kHz processing mode, the TAS5548 has four bass and treble tone control groups. 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)
22 TAS5548 DAP Architecture Copyright © 2012, Texas Instruments Incorporated
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