True RMS-to-DC Converters
4 _______________________________________________________________________________________
Input Bias Current
20 300
nA
Input Resistance
10
8
&
Output Current
Source
+5
mA
Sink
-130
礎
Short-Circuit Current
20
mA
UNITS
MIN TYP MAX
CONDITIONS
PARAMETER
Input and Output Voltage Range
-V
S
to
(+V
S
- 2.5)
V
Input Offset Voltage
R
S
= 25k&
Small-Signal Bandwidth
?.5 ?
mV
1
MHz
Slew Rate (Note 4)
5
V/祍
ELECTRICAL CHARACTERISTICSMX536A (continued)
(T
A
= +25癈, +V
S
= +15V, -V
S
= -15V, unless otherwise noted.)
ELECTRICAL CHARACTERISTICSMX636
(T
A
= +25癈, +V
S
= +3V, -V
S
= -5V, unless otherwise noted.)
V
IN
= 200mV
MHz
1.5
V
IN
= 200mV
?dB Bandwidth
900
V
IN
= 100mV
kHz
100
V
IN
= 10mV
130
MX636K
Bandwidth for 1%
Additional Error (0.09dB)
90
V
IN
= 200mV
kHz
14
V
IN
= 100mV
MX636J
-0.5
V
IN
= 10mV
Additional Error
-0.2
? of
Reading
Specified Accuracy
Crest Factor = 6
?.1 ?.1
Crest Factor = 3
Total Error, External Trim
(Note 5)
mV ? of
Reading
?.3 ?.1
MX636K
?.2 ?.5
MX636J
Total Error, Internal Trim
(Notes 5, 6)
mV ? of
Reading
?.5 ?.0
Crest Factor 1 to 2
V
OUT
= [avg. (V
IN
)2]
1/2
Transfer Equation
?.1
Total Error vs. DC Reversal
? of
Reading
?.2
mV ? of
Reading/V
?.1 ?.01
MX636J
Total Error vs. Supply
MX636K
Total Error vs. Temperature
(0癈 to +70癈)
mV ? of
Reading/癈
?.1 ?.01
?.1 ?.005
MX636K
MX636J
UNITS
MIN TYP MAX
CONDITIONS
PARAMETER
BUFFER AMPLIFIER
Figure 3
ms/礔 C
AV
25
Averaging Time Constant
CONVERSION ACCURACY
ERROR vs. CRESTFACTOR(Note 3)
FREQUENCYRESPONSE(Notes 6, 8)