19-0824; Rev 2; 3/96
True RMS-to-DC Converters
The MX536A and MX636 are true RMS-to-DC converters. They feature low power and are designed to accept
low-level input signals from 0 to 7VRMS for the MX536A
and 0 to 200mVRMS for the MX636. Both devices accept
complex input waveforms containing AC and DC components. They can be operated from either a single supply or dual supplies. Both devices draw less than 1mA
of quiescent supply current, making them ideal for battery-powered applications.
Input and output offset, positive and negative waveform
symmetry (DC reversal), and full-scale accuracy are
laser trimmed, so that no external trims are required to
achieve full rated accuracy.
________________________Applications
Digital Multimeters
Battery-Powered Instruments
Panel Meters
Process Control
Pin Configurations
TOP VIEW
RL 1
IOUT
10
8 BUF OUT
COMMON 2
MX536A
MX636B
+VS 3
VIN
9 BUF IN
4
5
-VS
7 dB
6 CAV
____________________________Features
o True RMS-to-DC Conversion
o Computes RMS of AC and DC Signals
o Wide Response:
2MHz Bandwidth for VRMS > 1V (MX536A)
1MHz Bandwidth for VRMS > 100mV (MX636)
o Auxiliary dB Output: 60dB Range (MX536A)
50dB Range (MX636)
o Single- or Dual-Supply Operation
o Low Power: 1.2mA typ (MX536A)
800µA typ (MX636)
Ordering Information
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-55°C to +125°C
PART
MX536AJC/D
MX536AJCWE
MX536AJD
MX536AJH
MX536AJN
MX536AJQ*
MX536AKCWE
MX536AKD
MX536AKH
MX536AKN
MX536AKQ*
MX536ASD
Ordering Information continued at end of data sheet.
* Maxim reserves the right to ship ceramic packages in lieu of
CERDIP packages.
** Dice are specified at TA = +25°C.
_________Typical Operating Circuits
CAV
TO-100
VIN 1
14 +VS
N.C. 2
12 N.C.
VIN
13 N.C.
-VS 3
CAV 4
dB 5
MX536A
MX636
ABSOLUTE
VALUE
2
-VS
SQUARER
DIVIDER
3
IOUT
VOUT
CURRENT
MIRROR
12
10
9
6
7
+VS
11
5
RL
14
13
4
10 COMMON
8
BUF IN 7
1
11 N.C.
9
BUF OUT 6
PIN-PACKAGE
Dice**
16 Wide SO
14 Ceramic
10 TO-100
14 Plastic DIP
14 CERDIP
16 Wide SO
14 Ceramic
10 TO-100
14 Plastic DIP
14 CERDIP
14 Ceramic
BUF
8
DIP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MX536A/MX636
General Description
