參數(shù)資料
型號: TAS5518PAG
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: GREEN, PLASTIC, TQFP-64
文件頁數(shù): 23/105頁
文件大小: 1514K
代理商: TAS5518PAG
Introduction
16
SLES115 — August 2004
TAS5518
1.5.2.2
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 110.
223 Bit
S_xxxx_xxxx_xxxx_xxxx_xxxx_xxxx.xxxx_xxxx_xxxx_xxxx_xxxx_xxx
20 Bit
216 Bit
222 Bit
Sign Bit
223 Bit
21 Bit
210 Bit
Figure 110. 25.23 Format
Figure 111 shows the derivation of the decimal value of a 48-bit 25.23 format number.
(1 or 0) x 223 + (1 or 0) x 222 + … + (1 or 0) x 20 + (1 or 0) x 21 + … + (1 or 0) x 223
223 Bit
222 Bit
20 Bit
21 Bit
223 Bit
Figure 111. Alignment of 5.23 Coefficient in 32-Bit I2C Word
Two 32-bit words must be sent over the I2C bus to download a level or threshold coefficient into the TAS5518.
The alignment of the 48-bit, 25.23 formatted coefficient in the 8-byte (two 32-bit words) I2C word is shown in
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