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DMS-20LCD-3-5

Description
3 1/2 Digit, LCD Display Low-Cost, Subminiature Digital Panel Voltmeters
File Size218KB,6 Pages
ManufacturerETC
Download Datasheet View All

DMS-20LCD-3-5 Overview

3 1/2 Digit, LCD Display Low-Cost, Subminiature Digital Panel Voltmeters

®
®
www.datel.com
DMS-20LCD Series
3½ Digit, LCD Display
Low-Cost, Subminiature
Digital Panel Voltmeters
DMS-20LCD Series, 3½ 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 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 (±200mV, ±2V, ±20V
and ±200V) and a user-friendly input structure. Input impedance is a minimum 800kΩ.
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.
Actual Size
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
Backlit displays optional
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
+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
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 ±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
Figure 1. DMS-20LCD Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA)
Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
Email: sales@datel.com
Internet: www.datel.com
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