參數(shù)資料
型號(hào)： LTC1966MPMS8#TRPBF
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)： 7/38頁(yè)
文件大?。?/td> 387K
代理商： LTC1966MPMS8#TRPBF
LTC1966
15
1966fb
applicaTions inForMaTion
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
configurations it will only work well for unipolar input
signals. The LTC1966 input voltage range is from rail-
to-rail, and when the input is driven above VDD or below
VSS (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.
Forsingle-endedAC-coupledapplications,Figure9shows
threealternatetopologies.Thefirstone,showninFigure9a
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 VSS to VDD. If there
is already a suitable voltage reference available, connect
the second input to that point. If not, a midsupply voltage
can be created with two resistors as shown in Figure 9b.
Finally, if the input voltage is known to be between VSS
and VDD, 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 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, CC, 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
TheLTC1966outputisdifferentially,butnotsymmetrically,
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 VSS
(Pin 4) and VDD (Pin 7) less the maximum output voltage
swingdesired.ThislastrestrictionkeepsVOUTitself(Pin5)
within the range of VSS to VDD. 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 VDD – 1V to VDD – 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 VDD is ≤3V.
Figure 9. Single-Ended AC-Coupled Input Connection Alternatives
+–
LTC1966
VDD
VSS
VDD
VSS OR GND
(9a)
CC
IN1
VIN
IN2
2
3
LTC1966
(9b)
CC
R1
100k
R2
100k
IN1
VIN
VDD
IN2
2
3
LTC1966
(9c)
CC
IN1
VIN
1966 F09
VDC
IN2
2
3
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