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參數資料
| 型號： | MX636KH |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | True RMS-to-DC Converters |
| 中文描述： | RMS TO DC CONVERTER, 0.1 MHz, MBCY10 |
| 封裝： | METAL CAN, TO-100, 10 PIN |
| 文件頁數： | 10/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | MX636KH |
M
Frequenc y 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 ±3dB 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 ±12V, and for the
MX536A it is ±20V. A 7V
RMS
signal with a crest factor
of 3 has a peak input of 21V.
Applic ation in a Low-Cost DV M
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)
E
100
PK-PK RIPPLE
R
X
= 0
PK-PK RIPPLE
(ONE POLE)
C2 = 4.7
μ
F
PK-PK RIPPLE
(TWOPOLE)
C2 = C3 = 4.7
μ
F
DC ERROR
(ALL FILTERS)
MX536A
2.2
μ
F
1
μ
F
2.2
μ
F
2.2
μ
F
1
μ
F
MX636
4.7
μ
F
1
μ
F
4.7
μ
F
4.7
μ
F
1
μ
F
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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相關代理商/技術參數 |
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|---|---|
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