參數(shù)資料
型號(hào)： CS4202-JQZR
廠商： Cirrus Logic Inc
文件頁數(shù)： 22/66頁
文件大?。?/td> 0K
描述： IC CODEC AUDIO '97 48-TQFP
標(biāo)準(zhǔn)包裝： 2,000
類型： 音頻編解碼器 '97
數(shù)據(jù)接口： 串行
分辨率（位）： 24 b
ADC / DAC 數(shù)量： 1 / 1
三角積分調(diào)變： 是
動(dòng)態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： 90 / 90
電壓 - 電源，模擬： 4.75 V ~ 5.25 V
電壓 - 電源，數(shù)字： 4.75 V ~ 5.25 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-TQFP（9x9）
包裝： 帶卷 (TR)
Micrel, Inc.
MIC3001
August 2004
29
M9999-082404-A
hbwhelp@micrel.com or (408) 955-1690
The LUTOFF register determines the range of measured
temperatures that are actually spanned by the tables. The
temperature span of the tables versus the value of
LUTOFF is given in Table 18.
LUTOFF
Temperature Span
tCOMP (min) – tCOMP (max)
00h
0°C to 127°C
01h
–2°C to 125°C
02h
–4°C to +123°C
0Fh
–30°C to 97°C
Table 18. Range of Temperature Compensation
Table vs. LUTOFF
The internal state machine calculates a new table index
each time a new average temperature value becomes
available. This table index is derived from the average
temperature value and LUTOFF. The table index is then
converted into a table address for each of the four look-up
tables. These operations can be expressed as:
(12)
where TAVG(n) is the current average temperature; and
TABLE_ADDRESS=INDEX+BASE_ADDRES
where BASE_ADDRESS is the physical base address of
each table, i.e., 00h, 40h, 80h, or C0h (all tables reside in the
I2CADR+4 page of memory).
At any given time, the current table index can be read in the
LUTINDX register.
Figures 12 and 13 illustrate the operation of the temperature
compensation tables.
Figure 12 is a graphical illustration of the use of the
LUTOFF register to control the temperature range spanned
by the temperature compensation tables. Note that, if the
LUTINDX becomes greater than 63 or less than zero, the
maximum or minimum table value is used, respectively. The
tables do not “roll over.”
Figure 13 llustrates that the table values are used as offsets
to the nominal value of the parameter in question. APCSET
is used as an example, but all four tables function
identically. Note that the shape and magnitude of the
compensation curve do not change as the nominal value
changes.
Figure 12. Examples of LUTOFF Operation
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