- 您现在的位置：买卖IC网 > PDF目录22183 > LTC1966CMS8 (Linear Technology)IC PREC RMS/DC CONV MCRPWR 8MSOP PDF资料下载
参数资料
| 型号： | LTC1966CMS8 |
| 厂商： | Linear Technology |
| 文件页数： | 14/38页 |
| 文件大小： | 391K |
| 描述： | IC PREC RMS/DC CONV MCRPWR 8MSOP |
| 标准包装： | 50 |
| 电流 - 电源： | 155µA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页
LTC1966
14
1966fb
applicaTions inForMaTion
A 1礔 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 + DC waveforms, a larger C
AVE
will generally be required.
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.
Another parasitic of ceramic capacitors is leakage, which is
again dependent on voltage and particularly temperature.
If the leakage is a constant current leak, the I " R drop of
the leak multiplied by the output impedance of the LTC1966
will create a constant offset of the output voltage. If the
leak is Ohmic, the resistor divider formed with the LTC1966
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.
With any type of capacitor, the self resonance of the capaci-
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
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 = 100礔
C = 47礔
C = 22礔
C = 10礔
C = 4.7礔
C = 2.2礔
C = 1礔
相关PDF资料 |
PDF描述 |
|---|---|
| GBB106DHHR-S621 | CONN EDGECARD 212POS .050 SOLDER |
| RAC15-24SB-E | CONV AC/DC 2A 6.5-18VIN 3.0-5.5V |
| PR1502G-T | DIODE FAST REC 1.5A 100V DO-15 |
| GBB106DHHR-S578 | CONN EDGECARD 212POS .050 SLD |
| VI-JVJ-IZ | CONVERTER MOD DC/DC 36V 25W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1966CMS8#PBF | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:管件 |
| LTC1966CMS8#TR | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:管件 |
| LTC1966CMS8#TRPBF | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装: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 类别:集成电路 (IC) >> PMIC - RMS 至 DC 转换器 系列:- 标准包装:46 系列:- 电流 - 电源:1.2mA 电源电压:±18 V，36 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。