DMS-20LCD Series
3�½ Digit, LCD Display Digital Panel Voltmeters
FEATURES
Lowest cost
Lowest power, 2mW
Subminiature size:
1.38" x 0.88" x 0.43"
35mm x 22mm x 11mm
Large (0.37"/9.4mm), enhanced-contrast LCD display
Epoxy-encapsulated, 12-pin DIP
Panel or pc-board mountable
4 differential input voltage ranges
High accuracy, ±1 count (±0.05%)
Single +5V supply or 9V battery
Low-battery annunciator
User-selectable decimal point placement
0 to +60°C temperature range
DMS-20LCD Series, 3�½ Digit, LCD Display, Digital Voltmeters represent the ultimate
combination of low price, low power, small size and high performance in digital meters.
Epoxy encapsulated in a subminiature (1.38” x 0.88” x 0.43”), 12-pin DIP package, these
completely self-contained, fully operational meters offer a combination of ruggedness,
long-term reliability and component-like ease-of-use simply not available in any other
meters.
Incorporating a precision reference and a factory-calibrated, autozeroing A/D converter,
DMS-20LCD meters are extremely accurate (±1 count) and are only slightly larger than
their 0.37"/9.4mm, enhanced-contrast, LCD displays. All models incorporate a built-in
bezel and are easily mounted in either panels or pc boards. Both backlit and non-backlit
versions are available.
DMS-20LCD meters have 4 differential input voltage ranges (±200mV, ±2V, ±20V and
±200V) and a user-friendly input structure. Input impedance is a minimum 800k . CMRR
is typically 86dB with a CMV of ±2V. Non-inverting inputs are overvoltage protected to
±100V (±250V for the ±200V input model).
All DMS-20LCD meters operate from a single +5V supply (drawing 400μA) or a single
+9V supply/battery (drawing 230μA). All models have a low-battery ("B") annunciator and
feature autopolarity changeover and overrange indication.
Also available is an application/evaluation board (DMS-EB2) that plugs directly onto the
back of any DMS-20LCD allowing direct inputs for common applications such as 4-20mA
inputs, zero/gain adjust, decimal point location, and input voltage dividing.
SIMPLIFIED SCHEMATIC DIAGRAM
+5V
+5V SUPPLY/ 1
+BATTERY
–5V
N.C.
2
DC/DC
CONVERTER
3
V+
2
12
(–) INPUT LO
0.01μF
R2
1
R1
V–
+2.0V
909k
11
(+) INPUT HI
5V RETURN/ 3
–BATTERY
J1
0 Vdc
A/D
CONVERTER
10 ANALOG
COMMON
DATA
DP 3
4
9
N.C./BACKLIGHT
4
5
DP 2
+5V
8
REFERENCE OUT
6
DP 1
7
REFERENCE IN
1
R2 is not used on ±200mV (-0) models or ±2V (-1) models.
R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models.
Only used on ±200mV (-0) and ±2V (-1) models.
3
DC/DC converter is not used on 9V-powered models,
J1 is connected.
Used on backlit models only.
N.C. for non-backlit models.
2
4
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MPM_DMS20lcd.B03
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MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
