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参数资料
| 型号： | TAS3103IDCP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO38 |
| 封装： | PLASTIC, HTSSOP-38 |
| 文件页数： | 106/148页 |
| 文件大小： | 1247K |
| 代理商： | TAS3103IDCP |
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31
3 Firmware Architecture
3.1
I2C Coefficient Number Formats
The firmware for the TAS3103 is housed in ROM resources within the TAS3103 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 TAS3103 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. There are exceptions to the use of saturation logic for summations that overflow—see the
section Digital Audio Processor (DAP) Arithmetic Unit.
3.1.1
28-Bit 5.23 Number Format
All mixer gain coefficients are 28-bit coefficients using a 5.23 number format. Numbers formatted as 5.23 numbers
means that there are 5 bits to the left of the decimal point and 23 bits to the right of the decimal point. This is shown
in the Figure 31.
223 Bit
S_xxxx.xxxx_xxxx_xxxx_xxxx_xxx
24 Bit
21 Bit
20 Bit
Sign Bit
23 Bit
Figure 31. 5.23 Format
The decimal value of a 5.23 format number can be found by following the weighting shown in Figure 32. If the most
significant bit is logic 0, the number is a positive number, and the weighting shown yields the correct number. If the
most significant bit is a logic 1, then the number is a negative number. In this case every bit must be inverted, a 1 added
to the result, and then the weighting shown in Figure 32 applied to obtain the magnitude of the negative number.
(1 or 0) x 23 + (1 or 0) x 22 +
… + (1 or 0) x 20 + (1 or 0) x 21 + … + (1 or 0) x 24 + … + (1 or 0) x 223
23 Bit
22 Bit
20 Bit
21 Bit
24 Bit
223 Bit
Figure 32. Conversion Weighting Factors—5.23 Format to Floating Point
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS3108 | 制造商:TI 制造商全称:Texas Instruments 功能描述:AUDIO DIGITAL SIGNAL PROCESSORS |
| TAS3108DCP | 功能描述:音频 DSP 8-Channel Audio DSP RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3108DCPG4 | 功能描述:音频 DSP 8-Channel Audio DSP RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3108DCPR | 功能描述:音频 DSP 8-Channel Audio DSP RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
| TAS3108DCPRG4 | 功能描述:音频 DSP 8-Channel Audio DSP RoHS:否 制造商:Texas Instruments 工作电源电压: 电源电流: 工作温度范围: 安装风格: 封装 / 箱体: 封装:Tube |
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