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參數(shù)資料
| 型號： | LTC1966IMS8 |
| 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)： | 15/32頁 |
| 文件大?。?/td> | 444K |
| 代理商： | LTC1966IMS8 |
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15
LTC1966
sn1966 1966fas
For single-ended DC-coupled applications, simply con-
nect one of the two inputs (they are interchangeable) to
the signal, and the other to ground. This will work well for
dual supply configurations, but for single supply con-
figurations it will only work well for unipolar input sig-
nals. The LTC1966 input voltage range is from rail-to-rail,
and when the input is driven above V
DD
or below V
SS
(ground for single supply operation) the gain and offset
errors will increase substantially after just a few hundred
millivolts of overdrive. Fortunately, most single supply
circuits measuring a DC-coupled RMS value will include
some reference voltage other than ground, and the
second LTC1966 input can be connected to that point.
For single-ended AC-coupled applications, Figure 9 shows
three alternate topologies. The first one, shown in Figure
9a uses a coupling capacitor to one input while the other
is grounded. This will remove the DC voltage difference from
the input to the LTC1966, and it will therefore not be part
of the resulting output voltage. Again, this connection will
work well with dual supply configurations, but in single
supply configurations it will be necessary to raise the volt-
age on the grounded input to assure that the signal at the
active input stays within the range of V
SS
to V
DD
. If there
is already a suitable voltage reference available, connect the
second input to that point. If not, a midsupply voltage can
Finally, if the input voltage is known to be between V
SS
and
V
DD
, it can be AC coupled by using the configuration
shown in Figure 9c. Whereas the DC return path was
provided through Pin 3 in Figures 9a and 9b, in this case,
the return path is provided on Pin 2, through the input
signal voltages. The switched capacitor action between
the two input pins of the LTC1966 will cause the voltage on
APPLICATIOU
W
U
U
the coupling capacitor connected to the second input to
follow the DC average of the input voltage.
For differential input applications, connect the two inputs to
the differential signal. If AC coupling is desired, one of the
two inputs can be connected through a series capacitor.
In all of these connections, to choose the input coupling
capacitor, C
C
, calculate the low frequency coupling time
constant desired, and divide by the LTC1966 differential
input impedance. Because the LTC1966 input impedance
is about 100 times its output impedance, this capacitor is
typically much smaller than the output averaging capaci-
tor. Its requirements are also much less stringent, and a
ceramic chip capacitor will usually suffice.
Output Connections
The LTC1966 output is differentially, but not symmetri-
cally, generated. That is to say, the RMS value that the
LTC1966 computes will be generated on the output (Pin 5)
relative to the output return (Pin 6), but these two pins are
not interchangeable. For most applications, Pin 6 will be
tied to ground (Pin 1), and this will result in the best
accuracy. However, Pin 6 can be tied to any voltage
between V
SS
(Pin 4) and V
DD
(Pin 7) less the maximum
output voltage swing desired. This last restriction keeps
V
OUT
itself (Pin 5) within the range of V
SS
to V
DD
. If a
reference level other than ground is used, it should be a
low impedance, both AC and DC, for proper operation of
the LTC1966.
Use of a voltage in the range of V
DD
– 1V to V
DD
– 1.3V can
lead to errors due to the switch dynamics as the NMOS
transistor is cut off. For this reason, it is recommended
that OUT RTN = 0V if V
DD
is
≤
3V.
Figure 9. Single-Ended AC-Coupled Input Connection Alternatives
+
LTC1966
V
DD
V
DD
V
SS
V
DD
V
SS
OR GND
(9a)
C
C
IN1
V
IN
IN2
2
3
LTC1966
(9b)
C
C
R1
100k
R2
100k
IN1
V
IN
V
DD
IN2
2
3
LTC1966
(9c)
C
C
IN1
V
IN
1966 F07
V
DC
IN2
2
3
相關(guān)PDF資料 |
PDF描述 |
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| LTC1966 | Precision Micropower, SIGMA RMS-to-DC Converter |
| LTC1966CMS8 | Precision Micropower, SIGMA RMS-to-DC Converter |
| LTC1967 | Precision Extended Bandwidth, RMS-to-DC Converter |
| LTC1967CMS8 | Precision Extended Bandwidth, RMS-to-DC Converter |
| LTC1967IMS8 | Precision Extended Bandwidth, RMS-to-DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1966IMS8#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 |
| LTC1966IMS8#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 |
| LTC1966IMS8#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 |
| LTC1966IMS8PBF | 制造商:Linear Technology 功能描述:RMS-to-DC Converter Prec. uPower MSOP8 |
| LTC1966MPMS8#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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