参数资料
型号: MX536AJCWE
厂商: Maxim Integrated
文件页数: 11/13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
Frequency Response
The MX536A/MX636 utilizes a logarithmic circuit in per-
forming the RMS computation of the input signal. The
bandwidth of the RMS converters is proportional to sig-
nal level. Figures 11 and 12 represent the frequency
response of the converters from 10mV to 7V
RMS
for the
MX536A and 1mV to 1V for the MX636, respectively.
The dashed lines indicate the upper frequency limits for
1%, 10%, and ?dB of reading additional error.
Caution must be used when designing RMS measuring
systems so that overload does not occur. The input
clipping level for the MX636 is ?2V, and for the
MX536A it is ?0V. A 7V
RMS
signal with a crest factor
of 3 has a peak input of 21V.
Application in a Low-Cost DVM
A low-cost digital voltmeter (DVM) using just two inte-
grated circuits plus supporting circuitry and LCD dis-
play is shown in Figure 13. The MAX130 is a 3 1/2 digit
integrating A/D converter with precision bandgap refer-
ence. The 10M&input attenuator is AC coupled to pin
6 of the MX636 buffer amplifier. The output from the
MX636 is connected to the MAX130 to give a direct
reading to the LCD display.
True RMS-to-DC Converters
10 ______________________________________________________________________________________
14
13
12
11
10
9
8
1
2
3
4
5
6
7
ABSOLUTE
VALUE
SQUARER
DIVIDER
CURRENT
MIRROR
BUF
V
IN
-V
S
+V
S
+V
S
V
RMS
 OUT
C
AV
I
OUT
R
L
COMMON
N.C.
N.C.
N.C.
dB
N.C.
C2
MX536A
MX636
Figure 7. MX536A/MX636 with a One-Pole Output Filter
14
13
12
11
10
9
8
1
2
3
4
5
6
7
ABSOLUTE
VALUE
SQUARER
DIVIDER
CURRENT
MIRROR
BUF
V
IN
-V
S
+V
S
V
RMS
 OUT
C
AV
C3
C2
R
X
*
* MX536A = 25k&
  MX636 = 10k&
MX536A
MX636
Figure 8. MX536A/MX636 with a Two-Pole Output Filter
0.1
10
1k
10k
1
10
FREQUENCY (Hz)
100
PK-PK RIPPLE
R
X
 = 0
PK-PK RIPPLE
(ONE POLE)
C2 = 4.7礔
PK-PK RIPPLE
(TWO POLE)
C2 = C3 = 4.7礔
DC ERROR
(ALL FILTERS)
MX536A
2.2礔
1礔
2.2礔
2.2礔
1礔
MX636
4.7礔
1礔
4.7礔
4.7礔
1礔
ONE-POLE FILTER
C2
C
AV
TWO-POLE FILTER
C2
C3
C
AF
Figure 9. Performance Features of Various Filter Types for
MX536A/MX636
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