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| 型号： | MX536AJCWE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/13页 |
| 文件大小： | 134K |
| 描述： | IC CONV TRUE RMS-DC 2MHZ 16SOIC |
| 标准包装： | 46 |
| 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 |
ly proportional to the value of C
AV
. Waveforms with high
crest factors, such as a pulse train with low duty cycle,
should have an average time constant chosen to be at
least ten times the signal period.
Using a large value of C
AV
to remove the output ripple
increases the settling time for a step change in the input
signal level. Figure 3 shows the relationship between
C
AV
and settling time, where 115ms settling equals 1礔
of C
AV
. The settling time, or time for the RMS converter to
settle to within a given percent of the change in RMS
level, is set by the averaging time constant, which varies
approximately 2:1 between increasing and decreasing
input signals. For example, increasing input signals
require 2.3 time constants to settle to within 1%, and 4.6
time constants for decreasing signals levels.
In addition, the settling time also varies with input signal
levels, increasing as the input signal is reduced, and
decreasing as the input is increased as shown in
Figures 6a and 6b.
Using Post Filters
A post filter allows a smaller value of C
AV
, and reduces
ripple and improves the overall settling time. The value
of C
AV
should be just large enough to give the maxi-
mum DC error at the lowest frequency of interest. The
post filter is used to remove excess output ripple.
Figures 7, 8, and 9 give recommended filter connec-
tions and values for both the MX536A and MX636.
Table 1 lists the number of time constants required for
the RMS section to settle to within different percentages
of the final value for a step change in the input signal.
Decibel Output (dB)
The dB output of the MX536A/MX636 originates in the
squarer/divider section and works well over a 60dB
range. The connection for dB measurements is shown
in Figure 10. The dB output has a temperature drift of
0.03dB/癈, and in some applications may need to be
compensated. Figure 10 shows a compensation
scheme. The amplifier can be used to scale the output
for a particular application. The values used in Figure
10 give an output of +100mV/dB.
True RMS-to-DC Converters
_______________________________________________________________________________________ 9
10
0
1
2.5
1m
100m
10
1
5
7.5
RMS INPUT LEVEL (V)
10m
MX536A
Figure 6a. MX536A Settling Time vs. Input Level
10
0
1
2.5
1m
100m
1
5
7.5
RMS INPUT LEVEL (V)
10m
MX636
Figure 6b. MX636 Settling Time vs. Input Level
Settling Time
to Within
Stated % of
New RMS
Level
1%
0.1%
0.01%
4.6?4.6?
6.9?6.9?
9.2?9.2?
Table 1. Number of RC Time Constants
(?/SPAN>) Required for MX536A/MX636 RMS
Converters to Settle to Within Stated % of
Final Value
FOR
DECREASING
AMPLITUDES
Basic Formulas
PARAMETERS
Note:(?/SPAN>) Settling Times for Linear RC Filter
4.6?2.0?
6.9?3.1?/DIV>
9.2?4.2?
FOR
INCREASING
AMPLITUDES
V 1 - e
-T/RC
V e
-T/RC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MX536AJCWE+ | 功能描述:IC CONV TRUE RMS-DC 2MHZ 16SOIC 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 |
| MX536AJD | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MX536AJED | 制造商:未知厂家 制造商全称:未知厂家 功能描述:RMS-to-DC Converter |
| MX536AJEDD | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MX536AJEJD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:RMS-to-DC Converter |
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