参数资料
型号: LTC1966CMS8#TR
厂商: Linear Technology
文件页数: 31/38页
文件大小: 391K
描述: IC PREC RMS/DC CONV MCRPWR 8MSOP
标准包装: 2,500
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: 带卷 (TR)
其它名称: LTC1966CMS8TR
LTC1966
31
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The calculations of the error terms for a 200mV full-scale
case are:
 
Gain =
Reading at 200mVReading at 20mV
180mV
Output Offset =
Reading at 20mV
Gain
20mV
DC, 2 Point
DC based calibration is preferable in many cases because a
DC voltage of known, good accuracy is easier to generate
than such an AC calibration voltage. The only down side
is that the LTC1966 input offset voltage plays a role. It is
therefore suggested that a DC based calibration scheme
check at least two points: 眆ull-scale. Applying the full-
scale input can be done by physically inverting the voltage
or by applying the same +full-scale input to the opposite
LTC1966 input.
For an otherwise AC-coupled application, only the gain
term may be worth correcting for, but for DC-coupled ap-
plications, the input offset voltage can also be calculated
and corrected for.
The calculations of the error terms for a 200mV full-scale
case are:
Gain =
Reading at 200mV+Reading at200mV
400mV
Input Offset =
Reading at200mVReading at 200mV
2"Gain
applicaTions inForMaTion
Note: Calculation of and correction for input offset voltage
are the only way in which the two LTC1966 inputs (IN1,
IN2) are distinguishable from each other. The calculation
above assumes the standard definition of offset; that a
positive offset is the case of a positive voltage error inside
the device that must be corrected by applying a like nega-
tive voltage outside. The offset is referred to whichever
pin is driven positive for the +full-scale reading.
DC, 3 Point
One more point is needed with a DC calibration scheme
to determine output offset voltage: +10% of full scale.
The calculation of the input offset is the same as for the
2-point calibration above, while the gain and output offset
are calculated for a 200mV full-scale case as:
Gain =
Reading at 200mVReading at 20mV
180mV
Output Offset =
Reading at 200mV+Reading at200mV400mV"Gain
2
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LTC1966CMS8 IC PREC RMS/DC CONV MCRPWR 8MSOP
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