參數(shù)資料
型號(hào)： 71M6521DE-IMR/F
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, QCC68
封裝： LEAD FREE, LQFN-68
文件頁數(shù)： 63/103頁
文件大小： 1691K
代理商： 71M6521DE-IMR/F
71M6521DE/71M6521FE
Energy Meter IC
DATA SHEET
OCTOBER 2010
Page: 62 of 103
2005-2010 Teridian Semiconductor Corporation
v1.1
A Maxim Integrated Products Brand
19-5370; 10/10
Example: Let us assume a crystal characterized by the measurements shown in Table 61:
Deviation from
Nominal
Temperature [°C]
Measured
Frequency [Hz]
Deviation from
Nominal
Frequency [PPM]
+50
32767.98
-0.61
+25
32768.28
8.545
0
32768.38
11.597
-25
32768.08
2.441
-50
32767.58
-12.817
Table 61: Frequency over Temperature
The values show that even at nominal temperature (the temperature at which the chip was calibrated for energy), the deviation
from the ideal crystal frequency is 11.6 PPM, resulting in about one second inaccuracy per day, i.e. more than some standards
allow. As Figure 30 shows, even a constant compensation would not bring much improvement, since the temperature
characteristics of the crystal are a mix of constant, linear, and quadratic effects.
32767.5
32767.6
32767.7
32767.8
32767.9
32768
32768.1
32768.2
32768.3
32768.4
32768.5
-50
-25
0
25
50
Figure 30: Crystal Frequency over Temperature
One method to correct the temperature characteristics of the crystal is to obtain coefficients from the curve in Figure 30 by
curve-fitting the PPM deviations. A fairly close curve fit is achieved with the coefficients a = 10.89, b = 0.122, and c = –0.00714
+
=
6
2
6
10
1
c
T
b
T
a
f
nom
When applying the inverted coefficients, a curve (see Figure 31) will result that effectively neutralizes the original crystal
characteristics.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
71M6521DH 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs
71M6521DH-IGT/F 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs
71M6521DH-IGTR/F 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Energy Meter ICs
71M6521FE 制造商:TERIDIAN 制造商全稱:TERIDIAN 功能描述:Energy Meter IC
71M6521FE-DB 功能描述:開發(fā)板和工具包 - 8051 71M6521FE Demo Brd RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓:
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