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参数资料
| 型号： | TAS5504PAGRG4 |
| 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： | 14/96页 |
| 文件大小： | 1216K |
| 代理商： | TAS5504PAGRG4 |
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Introduction
13
SLES123 October 2004
TAS5504
The decimal value of a 5.23 format number can be found by following the weighting shown in Figure 16. 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 16 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 16. Conversion Weighting Factors—5.23 Format to Floating Point
Gain coefficients, entered via the I2C bus, must be entered as 32-bit binary numbers. The format of the 32-bit
number (4-byte or 8-digit hexadecimal number) is shown in Figure 17.
u
Coefficient
Digit 8
u u u
S x x x
Coefficient
Digit 7
x. x x x
Coefficient
Digit 6
x x x x
Coefficient
Digit 5
x x x x
Coefficient
Digit 4
x x x x
Coefficient
Digit 3
x x x x
Coefficient
Digit 2
x x x x
Coefficient
Digit 1
Fraction
Digit 5
Sign
Bit
0
Fraction
Digit 6
Fraction
Digit 4
Fraction
Digit 3
Fraction
Digit 2
Fraction
Digit 1
Integer
Digit 1
u = unused or don’t care bits
Digit = hexadecimal digit
Figure 17. Alignment of 5.23 Coefficient in 32-Bit I2C Word
As Figure 17 shows, the hex value of the integer part of the gain coefficient cannot be concatenated with the
hex value of the fractional part of the gain coefficient to form the 32-bit I2C coefficient. The reason is that the
28-bit coefficient contains 5 bits of integer, and thus the integer part of the coefficient occupies all of one hex
digit and the most significant bit of the second hex digit. In the same way, the fractional part occupies the lower
3 bits of the second hex digit, and then occupies the other five hex digits (with the eighth digit being the
zero-valued most significant hex digit).
1.4.2.2
48-Bit 25.23 Number Format
All level adjustment and threshold coefficients are 48-bit coefficients using a 25.23 number format. Numbers
formatted as 25.23 numbers means that there are 25 bits to the left of the decimal point and 23 bits to the right
of the decimal point. This is shown in Figure 18.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TAS5508 | 制造商:TI 制造商全称:Texas Instruments 功能描述:8 Channel Digital Audio PWM Processor |
| TAS5508-5121K8EVM | 功能描述:音频 IC 开发工具 TAS5508-TAS5121K8 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TAS5508-5122C6EVM | 功能描述:音频 IC 开发工具 TAS5508-5122C6 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TAS5508-5142K7EVM | 功能描述:音频 IC 开发工具 HI PERF MULTI PWM RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TAS5508A | 制造商:TI 制造商全称:Texas Instruments 功能描述:8 Channel Digital Audio PWM Processor |
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