廬
廬
www.datel.com
DMS-20LCD Series
3錕?frac12; Digit, LCD Display
Low-Cost, Subminiature
Digital Panel Voltmeters
DMS-20LCD Series, 3錕?frac12; 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 (鹵1 count) and are only slightly
larger than their 0.37"/9.4mm, enhanced-contrast, LCD displays. All models incorpo-
rate 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 (鹵200mV, 鹵2V, 鹵20V
and 鹵200V) and a user-friendly input structure. Input impedance is a minimum 800k鈩?
CMRR is typically 86dB with a CMV of 鹵2V. Non-inverting inputs are overvoltage
protected to 鹵100V (鹵250V for the 鹵200V input model).
All DMS-20LCD meters operate from a single +5V supply (drawing 400碌A) or a
single +9V supply/battery (drawing 230碌A). 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.
Actual Size
Features
鈥?/div>
Lowest cost
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Lowest power, 2mW
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Subminiature size:
1.38" x 0.88" x 0.43"
35mm x 22mm x 11mm
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Large (0.37"/9.4mm), enhanced-
contrast LCD display
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Backlit displays optional
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Epoxy-encapsulated, 12-pin DIP
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Panel or pc-board mountable
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4 differential input voltage ranges
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High accuracy, 鹵1 count (鹵0.05%)
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Single +5V supply or 9V battery
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Low-battery annunciator
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User-selectable decimal point placement
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0 to +60擄C temperature range
+5V
+5V SUPPLY/ 1
+BATTERY
鈥?V
N.C.
2
DC/DC
CONVERTER
3
V+
2
12
(鈥? INPUT LO
0.01碌F
R2
1
R1
V鈥?/div>
祿
+2.0V
909k
11
(+) INPUT HI
5V RETURN/ 3
鈥揃ATTERY
J1
0 Vdc
A/D
CONVERTER
10 ANALOG
COMMON
4
DP 3
DATA
9
N.C./BACKLIGHT
4
DP 2
5
+5V
8
REFERENCE OUT
6
DP 1
7
REFERENCE IN
1
R2 is not used on 鹵200mV (-0) models or 鹵2V (-1) models.
R2 = 100k on 鹵20V (-2) models and 9.1k on 鹵200V (-3) models.
Only used on 鹵200mV (-0) and 鹵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
Figure 1. DMS-20LCD Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA)
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Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
鈥?/div>
Email: sales@datel.com
鈥?/div>
Internet: www.datel.com
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