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參數(shù)資料
| 型號： | LTC1966CMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | Precision Micropower, SIGMA RMS-to-DC Converter |
| 中文描述： | RMS TO DC CONVERTER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 17/32頁 |
| 文件大小： | 444K |
| 代理商： | LTC1966CMS8 |
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17
LTC1966
sn1966 1966fas
prior generation log/antilog RMS-to-DC converters, whose
averaging time constants are dependent on the signal
level, resulting in excruciatingly long waits for the output
to go to zero.
The shape of the rising and falling edges will be dependent
on the total percent change in the step, but for less than the
100% changes shown in Figure 11, the responses will be
less distorted and more like a standard exponential decay.
For example, when the input amplitude is changed from
100mV to 110mV (+10%) and back (–10%), the step
responses are essentially the same as a standard expo-
nential rise and decay between those two levels. In such
cases, the time constant of the decay will be in between
that of the rising edge and falling edge cases of Figure 11.
Therefore, the worst case is the falling edge response as
it goes to zero, and it can be used as a design guide.
APPLICATIOU
W
U
U
Figure12 shows the settling accuracy vs settling time for
a variety of averaging capacitor values. If the capacitor
value previously selected (based on error requirements)
gives an acceptable settling time, your design is done.
But with 100
μ
F, the settling time to even 10% is a full 38
seconds, which is a long time to wait. What can be done
about such a design If the reason for choosing 100
μ
F is
to keep the DC error with a 75mHz input less than 0.1%,
the answer is: not much. The settling time to 1% of 76
seconds is just 5.7 cycles of this extremely low frequency.
Averaging very low frequency signals takes a long time.
However, if the reason for choosing 100
μ
F is to keep the
peak error with a 10Hz input less than 0.05%, there is
another way to achieve that result with a much improved
settling time.
Figure 11a. LTC1966 Rising Edge with C
AVE
= 1
μ
F
Figure 11b. LTC1966 Falling Edge with C
AVE
= 1
μ
F
TIME (SEC)
0
0
L
20
40
60
80
100
120
0.1
0.2
0.3
0.4
1966 F11a
0.5
C
AVE
= 1
μ
F
TIME (SEC)
0
0
L
20
40
60
80
100
120
0.2
0.4
0.6
0.8
1966 F11b
1
C
AVE
= 1
μ
F
SETTLING TIME (SEC)
0.01
0.1
S
1
10
1
10
0.1
100
1966 F12
C = 100
μ
F
C = 47
μ
F
C = 22
μ
F
C = 10
μ
F
C = 4.7
μ
F
C = 2.2
μ
F
C = 0.47
μ
F
C = 0.22
μ
F
C = 0.1
μ
F
C = 1
μ
F
Figure 12. LTC1966 Settling Time with One Cap Averaging
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PDF描述 |
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| LTC1967 | Precision Extended Bandwidth, RMS-to-DC Converter |
| LTC1967CMS8 | Precision Extended Bandwidth, RMS-to-DC Converter |
| LTC1967IMS8 | Precision Extended Bandwidth, RMS-to-DC Converter |
| LTTJ | Precision Extended Bandwidth, RMS-to-DC Converter |
| LTC1968 | Precision Wide Bandwidth, RMS-to-DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1966CMS8#PBF | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966CMS8#TR | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966CMS8#TRPBF | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966CMS8PBF | 制造商:Linear Technology 功能描述:RMS-to-DC Converter Prec. uPower MSOP8 |
| LTC1966HMS8#PBF | 功能描述:IC RMS/DC CONV MICROPWR 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
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