General Description
The MX536A and MX636 are true RMS-to-DC convert-
ers. 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 com-
ponents. They can be operated from either a single sup-
ply or dual supplies. Both devices draw less than 1mA
of quiescent supply current, making them ideal for bat-
tery-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
____________________________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)
800A typ (MX636)
MX536A/MX636
True RMS-to-DC Converters
________________________________________________________________
Maxim Integrated Products
1
14
13
12
11
10
9
8
1
2
3
4
5
6
7
+VS
N.C.
COMMON
RL
IOUT
VIN
N.C.
-VS
CAV
dB
BUF OUT
BUF IN
MX536A
MX636
DIP
TOP VIEW
MX536A
MX636B
TO-100
8
9
10
1
2
3
4
5
6
7
BUF IN
BUF OUT
dB
CAV
-VS
+VS
IOUT
RL
COMMON
VIN
Pin Configurations
14
13
12
11
10
9
8
1
2
3
4
5
6
7
ABSOLUTE
VALUE
SQUARER
DIVIDER
CURRENT
MIRROR
BUF
VIN
-VS
+VS
VOUT
CAV
_________Typical Operating Circuits
19-0824; Rev 2; 3/96
PART
MX536AJC/D
MX536AJCWE
MX536AJD
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
Dice**
16 Wide SO
14 Ceramic
Ordering Information
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.
MX536AJH
MX536AJN
0°C to +70°C
10 TO-100
14 Plastic DIP
MX536AJQ*
MX536AKCWE
0°C to +70°C
14 CERDIP
16 Wide SO
MX536AKD
MX536AKH
0°C to +70°C
14 Ceramic
10 TO-100
MX536AKN
0°C to +70°C
14 Plastic DIP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
MX536AKQ*
0°C to +70°C
14 CERDIP
MX536ASD
-55°C to +125°C
14 Ceramic
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.