參數(shù)資料
型號(hào)： LTC1966MPMS8#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 模擬專用變換器
英文描述： RMS TO DC CONVERTER, PDSO8
封裝： LEAD FREE, PLASTIC, MSOP-8
文件頁(yè)數(shù)： 6/38頁(yè)
文件大?。?/td> 387K
代理商： LTC1966MPMS8#PBF
LTC1966
14
1966fb
applicaTions inForMaTion
A 1F capacitor is a good choice for many applications.
The peak error at 50Hz/60Hz will be <1% and the DC error
will be <0.1% with frequencies of 10Hz or more.
Note that both Figure 6 and Figure 8 assume AC-coupled
waveforms with a crest factor less than 2, such as sine
waves or triangle waves. For higher crest factors and/or
AC+DCwaveforms,alargerCAVEwillgenerallyberequired.
See Crest Factor and AC + DC Waveforms.
Capacitor Type Selection
The LTC1966 can operate with many types of capacitors.
The various types offer a wide array of sizes, tolerances,
parasitics, package styles and costs.
Ceramic chip capacitors offer low cost and small size,
but are not recommended for critical applications. The
value stability over voltage and temperature is poor with
many types of ceramic dielectrics. This will not cause an
RMS-to-DC accuracy problem except at low frequencies,
where it can aggravate the effects discussed in the pre-
vious section. If a ceramic capacitor is used, it may be
necessary to use a much higher nominal value in order
to assure the low frequency accuracy desired.
Anotherparasiticofceramiccapacitorsisleakage,whichis
again dependent on voltage and particularly temperature.
If the leakage is a constant current leak, the I R drop of
theleakmultipliedbytheoutputimpedanceoftheLTC1966
will create a constant offset of the output voltage. If the
leakisOhmic,theresistordividerformedwiththeLTC1966
output impedance will cause a gain error. For <0.1%
gain accuracy degradation, the parallel impedance of the
capacitor leakage will need to be >1000 times the LTC1966
output impedance. Accuracy at this level can be hard to
achieve with a ceramic capacitor, particularly with a large
value of capacitance and at high temperature.
For critical applications, a film capacitor, such as metalized
polyester, will be a much better choice. Although more
expensive, and larger for a given value, the value stabil-
ity and low leakage make metal film capacitors a trouble
free choice.
Withanytypeofcapacitor,theselfresonanceofthecapaci-
tor can be an issue with the switched capacitor LTC1966.
If the self resonant frequency of the averaging capacitor
is 1MHz or less, a second smaller capacitor should be
added in parallel to reduce the impedance seen by the
LTC1966 output stage at high frequencies. A capacitor 100
times smaller than the averaging capacitor will typically be
small enough to be a low cost ceramic with a high quality
dielectric such as X7R or NPO/COG.
Input Connections
The LTC1966 input is differential and DC coupled. The
LTC1966 responds to the RMS value of the differential
voltage between Pin 2 and Pin 3, including the DC por-
tion of that difference. However, there is no DC-coupled
path from the inputs to ground. Therefore, at least one of
the two inputs must be connected with a DC return path
to ground.
Both inputs must be connected to something. If either
input is left floating, a zero volt output will result.
Figure 8. Peak Error vs Input Frequency with One Cap Averaging
INPUT FREQUENCY (Hz)
1
–2.0
PEAK
ERROR
(%)
–1.6
–1.2
–0.8
–0.4
10
20
50
60
100
1966 F08
0
–1.8
–1.4
–1.0
–0.6
–0.2
C = 100F
C = 47F
C = 22F
C = 10F
C = 4.7F
C = 2.2F
C = 1F
相關(guān)PDF資料
PDF描述
LTC1966HMS8#PBF RMS TO DC CONVERTER, PDSO8
LTC1966MPMS8#TRPBF RMS TO DC CONVERTER, PDSO8
LTC2141IUP-12#PBF 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
LTC2141CUP-12#TRPBF 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
LTC2141CUP-12#PBF 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1967CMS8 功能描述:IC CONVERTER RMS-DC PREC 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
LTC1967CMS8#PBF 功能描述:IC CONVERTER RMS-DC PREC 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
LTC1967CMS8#TR 功能描述:IC CONVERTER RMS-DC PREC 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
LTC1967CMS8#TRPBF 功能描述:IC CONVERTER RMS-DC PREC 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
LTC1967CMS8PBF 制造商:Linear Technology 功能描述:RMS-DC converter, LTC1967 40kHz MSOP
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*