19-0824; Rev 2; 3/96
True RMS-to-DC Converters
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 7V
RMS
for the MX536A
and 0 to 200mV
RMS
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.
____________________________Features
o
True RMS-to-DC Conversion
o
Computes RMS of AC and DC Signals
o
Wide Response:
2MHz Bandwidth for V
RMS
> 1V (MX536A)
1MHz Bandwidth for V
RMS
> 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)
800碌A typ (MX636)
MX536A/MX636
Ordering Information
PART
MX536AJC/D
MX536AJCWE
MX536AJD
MX536AJH
MX536AJN
MX536AJQ*
MX536AKCWE
MX536AKD
MX536AKH
MX536AKN
MX536AKQ*
MX536ASD
TEMP. RANGE
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
0擄C to +70擄C
-55擄C to +125擄C
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
________________________Applications
Digital Multimeters
Battery-Powered Instruments
Panel Meters
Process Control
Pin Configurations
TOP VIEW
I
OUT
10
R
L
1
COMMON
2
+V
S
3
V
IN
4
9
BUF IN
8
BUF OUT
MX536A
MX636B
5
-V
S
7
dB
6
C
AV
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 T
A
= +25擄C.
_________Typical Operating Circuits
C
AV
TO-100
V
IN
1
N.C. 2
-V
S
3
C
AV
4
dB 5
BUF OUT 6
BUF IN 7
14 +V
S
13 N.C.
12 N.C.
V
IN
1
2
ABSOLUTE
VALUE
SQUARER
DIVIDER
14
13
12
11
+V
S
-V
S
MX536A
MX636
3
4
5
11 N.C.
10 COMMON
9
8
R
L
I
OUT
V
OUT
CURRENT
MIRROR
10
9
6
7
BUF
8
DIP
Pin Configurations continued at end of data sheet.
Typical Operating Circuits continued at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.