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参数资料
| 型号： | TAS5518PAGRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 21/105页 |
| 文件大小： | 1514K |
| 代理商： | TAS5518PAGRG4 |
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Introduction
14
SLES115 — August 2004
TAS5518
7 Biquads
in Series
Bass and
Treble
Loudness
DRC
Input Mixer
1 Other
Channel Output
From 7 Available
32Bit
Trunc
PWM
Proc
Volume
A_to_ipmix
B_to_ipmix
A
SDIN1
B
C_to_ipmix
D_to_ipmix
C
SDIN2
D
E_to_ipmix
F_to_ipmix
E
SDIN3
F
G_to_ipmix
H_to_ipmix
G
SDIN4
H
Max
Volume
Left
Right
Channel
Volume
Master
Volume
Bass and Treble
Bypass
Bass and Treble
In-Line
Pre-
Volume
Post-
Volume
DRC
In-Line
DRC
Bypass
Output
Gain
Output Mixer Sums
Any Two Channels
PWM
Output
Figure 16. TAS5518 Detailed Channel Processing
1.5.2 I2C Coefficient Number Formats
The architecture of the TAS5518 is contained in ROM resources within the TAS5518 and cannot be altered.
However, mixer gain, level offset, and filter tap coefficients, which can be entered via the I2C bus interface,
provide a user with the flexibility to set the TAS5518 to a configuration that achieves the system level goals.
The firmware is executed in a 48-bit signed fixed-point arithmetic machine. The most significant bit of the 48-bit
data path is a sign bit, and the 47 lower bits are data bits. Mixer gain operations are implemented by multiplying
a 48-bit signed data value by a 28-bit signed gain coefficient. The 76-bit signed output product is then truncated
to a signed 48-bit number. Level offset operations are implemented by adding a 48-bit signed offset coefficient
to a 48-bit signed data value. In most cases, if the addition results in overflowing the 48-bit signed number
format, saturation logic is used. This means that if the summation results in a positive number that is greater
than 0x7FFF_FFFF_FFFF (the spaces are used to ease the reading of the hexadecimal number), the number
is set to 0x7FFF_FFFF_FFFF. If the summation results in a negative number that is less than
0x8000_0000_0000 0000, the number is set to 0x8000_0000_0000 0000.
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