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參數(shù)資料
| 型號： | MX536AJCWE |
| 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, 0.09 MHz, PDSO16 |
| 封裝： | SOP-16 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | MX536AJCWE |
M
_______________Detailed Desc ription
The MX536A/MX636 uses an implicit method of RMS
computation that overcomes the dynamic range as well
as other limitations inherent in a straightforward compu-
tation of the RMS. The actual computation performed
by the MX536A/MX636 follows the equation:
V
RMS
= Avg. [V
IN2
/V
RMS
]
The input voltage, V
IN
, applied to the MX536A/MX636 is
processed by an absolute-value/voltage to current con-
verter that produces a unipolar current I
1
(Figure 1).
This current drives one input of a squarer/divider that
produces a current I
4
that has a transfer function:
I
4
= I
1
2
I
3
The current I
4
drives the internal current mirror through
a lowpass filter formed by R1 and an external capaci-
tor, C
AV
. As long as the time constant of this filter is
greater than the longest period of the input signal, I
4
is
averaged. The current mirror returns a current, I
3
, to the
square/divider to complete the circuit. The current I
4
is
then a function of the average of (I
12
/I
4
), which is equal
to I
1RMS
.
The current mirror also produces a 2 · I
4
output current,
I
OUT
, that can be used directly or converted to a volt-
age using resistor R2 and the internal buffer to provide
a low-impedance voltage output. The transfer function
for the MX536A/MX636 is:
V
OUT
= 2 · R2 · I
RMS
= V
IN
The dB output is obtained by the voltage at the emitter
of Q3, which is proportional to the -log V
IN
. The emitter
follower Q5 buffers and level shifts this voltage so that
the dB output is zero when the externally set emitter
current for Q5 approximates I
3
.
S tandard Connec tion
(Figure 2)
The standard RMS connection requires only one exter-
nal component, C
AV
. In this configuration the
MX536A/MX636 measures the RMS of the AC and DC
levels present at the input, but shows an error for low-
frequency inputs as a function of the C
AV
filter capaci-
tor. Figure 3 gives practical values of C
AV
for various
values of averaging error over frequency for the stan-
dard RMS connections (no post filtering). If a 3μF
capacitor is chosen, the additional error at 100Hz will
be 1%. If the DC error can be rejected, a capacitor
should be connected in series with the input, as would
typically be the case in single-supply operation.
The input and output signal ranges are a function of the
supply voltages. Refer to the electrical characteristics for
guaranteed performance. The buffer amplifier can be
used either for lowering the output impedance of the cir-
cuit, or for other applications such as buffering high-
impedance input signals. The MX536A/MX636 can be
used in current output mode by disconnecting the inter-
nal load resistor, R
L
, from ground. The current output is
available at pin 8 (pin 10 on the “H” package) with a
nominal scale of 40μA/V
RMS
input for the MX536A and
100μA/V
RMS
input for the MX636. The output is positive.
True RMS -to-DC Converters
6
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—MX636 (continued)
(T
A
= +25°C, +V
S
= +3V, -V
S
= -5V, unless otherwise noted.)
PARAMETER
POWER SUPPLY
Rated Performance
Dual Supplies
Single Supply
Quiescent Current (Note 10)
+3/-5
V
V
V
+2/-2.5
+5
±16.5
+24
1
UNITS
MIN
TYP
MAX
CONDITIONS
0.8
mA
Note 1:
Accuracy is specified for 0 to 7V
RMS
, DC or 1kHz sine-wave input with the MX536A connected as in Figure 2.
Note 2:
Error vs. crest factor is specified as an additional error for 1V
RMS
rectangular pulse stream, pulse width = 200μs.
Note 3:
Input voltages are expressed in volts RMS, and error as % of reading.
Note 4:
With 2k
external pull-down resistor.
Note 5:
Accuracy is specified for 0 to 200mV, DC or 1kHz sine-wave input. Accuracy is degraded at higher RMS signal levels.
Note 6:
Measured at pin 8 of DIP and SO (I
OUT
), with pin 9 tied to COMMON.
Note 7:
Error vs. crest factor is specified as an additional error for 200mV
RMS
rectangular pulse input, pulse width = 200μs.
Note 8:
Input voltages are expressed in volts RMS.
Note 9:
With 10k
external pull-down resistor from pin 6 (BUF OUT) to -V
S
.
Note 10:
With BUF input tied to COMMON.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MX636 | True RMS-to-DC Converters |
| MX536AKCWE | Circular Connector; No. of Contacts:6; Series:MS27474; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:8; Circular Contact Gender:Socket; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:8-35 RoHS Compliant: No |
| MX536AJH | JT 66C 66#22M PIN PLUG |
| MX636JCWE | RECTIFIER GPP 1000V 3A DO-201AD |
| MX636JD | RECTIFIER STANDARD SINGLE 3A 1000V 1000 200A-ifsm 10uA-ir 1V-vf DO-201AD 1.2K/REEL-13 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MX536AJCWE+ | 功能描述:IC CONV TRUE RMS-DC 2MHZ 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝: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:未知廠家 制造商全稱:未知廠家 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:未知廠家 制造商全稱:未知廠家 功能描述:RMS-to-DC Converter |
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