DATEL DMS-30LCD-0-9B, DMS-30LCD-0-9, DMS-30LCD-0-5B, DMS-30LCD-0-5, DMS-30LCD-3-9B Datasheet

DATEL, Inc., Mansfield, MA 02048 (USA) • Tel: [phone] Fax: [phone] • Email: [e-mail] • Internet: www.datel.com

Figure 1. DMS-30LCD Series Simplified Schematic

DMS-30LCD Series

3½ Digit, LCD Display

Low-Power, Miniature

Digital Panel Voltmeters

Features

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Large (0.4"/10.2mm), enhanced­contrast, LCD display

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Single +5V supply or 9V battery

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Power as low as 3.2mW

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Miniature size:

2.17" x 0.92" x 0.43"
55mm x 23mm x 11mm

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Epoxy-encapsulated, 12-pin DIP

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Backlit displays optional

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4 differential input voltage ranges

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High accuracy, ±1 count (±0.05%)

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Autopolarity changeover and overrange
indication

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User-selectable decimal point placement

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Numerous "plug-on" application boards

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0 to +60°C temperature range

Offering all the outstanding features and benefits of DATEL's industry leading
DMS-20LCD Series of 3½ Digit LCD Panel Meters, DMS-30LCD meters offer larger,
more easily readable displays at slightly higher power consumptions. Like all DMS
Series LCD meters, these miniature (2.17" x 0.92" x 0.43"), epoxy-encapsulated
devices offer component-like ease-of-use, outstanding reliability and easy installation
in either panels or pc-cards.

DMS-30LCD devices operate from a single +5V supply or a 9V battery. Battery­operated units typically draw 350µA and consume a mere 3.2mW. Backlit models are
available for low-light applications; though we have found many designers prefer
DATEL's unique low-power LED meters in those circumstances.

Offering 4 optional input voltage ranges (±200mV, ±2V, ±20V or ±200V), DMS­30LCD meters have an extremely user-friendly input structure. They can be used in
differential or single-ended modes. Input impedance is a minimum 800kΩ. CMRR is
typically 86dB. CMV is ±2V, and inputs are overvoltage protected to ±100V.

Each meter incorporates an extremely stable, double regulated reference and is
fully calibrated at our factory prior to encapsulation. We guarantee outstanding initial
accuracy (±1 count) and excellent stability over temperature (±0.15 counts/°C).
These extremely rugged meters are moisture and vibration proof and never require
adjustment or recalibration.

For popular applications (4-to-20mA, rms-to-dc conversion, ac line power, J and K
thermocouples, etc.), the DMS-30LCD Series includes a complete line of "plug-on"
application boards that conveniently convert your meter into an application-specific
instrument.

Actual Size

+1.23V REFERENCE OUT

(+) INPUT HI

(–) INPUT LO

ANALOG
COMMON

REFERENCE OUT

REFERENCE IN

+5V SUPPLY/

+BATTERY

R1

DP 1

DP 2

DP 3

6

5

4

9

11

12

10

8

7

1

3

DC/DC

CONVERTER

2

5V RETURN/

–BATTERY

+5V

–5V

+5V

1.23V
REF.

R2

»

+2.0V

DATA

909k

V+

V–

A/D

CONVERTER

0 Vdc

0.01µF

1

DISPLAY TEST/

BACKLIGHT

R2 is not used on ± 2 0 0 m V (-0) models or ±2V (-1) models.
R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models.

J1

DC/DC converter is not used on 9V-powered models,
J1 is connected.

Display Test function is not available on backlit models.

1.82k

3

2

1

3

2

®®

www.datel.com

2

Analog Inputs Min. Typ. Max.

Units

Full Scale Input Range:

DMS-30LCD-0 -- ±200 -- mV
DMS-30LCD-1 -- ±2 -- Volts
DMS-30LCD-2 -- ±20 -- Volts
DMS-30LCD-3 -- ±200 -- Volts

Input Impedance:

DMS-30LCD-0, -1 100 1000 -- M

Ω

DMS-30LCD-2, -3 0.8 1 -- M

Ω

Overvoltage Protection

➀

DMS-30LCD-0, -1, -2 -- -- ±100 Volts
DMS-30LCD-3 -- -- ±250 Volts

Common Mode Voltage Range

➁

-- -- ±2 Volts

CMRR (dc to 60Hz) -- 86 -- dB
Control Inputs ➂
Decimal Point Placement (Pins 4-6):

Functionality Tie to pin 3 to activate
Logic Compatibility TTL (on 5V-powered models)

Display T est (Pin 2) Tie to pin 1 to activate
Backlight (Pin 2) Tie to pin 3 to turn on backlight
Performance
Sampling Rate 2.5 samples per second

Accuracy (1 minute warm-up):

DMS-30LCD-0 (VIN = +0.19) -- ±1 ±2 Counts
DMS-30LCD-1 (VIN = +1.9V) -- ±1 ±2 Counts
DMS-30LCD-2 (VIN = +19V) -- ±2 ±3 Counts
DMS-30LCD-3 (VIN = +190V) -- ±2 ±3 Counts

Zero Reading (VIN = 0 Volts) "–001" "000" "001"
Temperature Drift (0 to +60°C) -- ±0.15 ±0.3 Cnts/°C
+1.23V Reference Out (Pin 9) +1.20 +1.23 +1.25 Volts
Power Supply Requirements (5V Models)
Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:

Standard Models -- 800 1200 µA
Backlit Models -- 45 60 mA

Power Supply Requirements (9V Models)
Supply Voltage +7.5 +9.0 +14.0 Volts

Supply Current:

Standard Models -- 350 600 µA
Backlit Models -- 45 60 mA

Display
Display Type and Size 3½ Digit LCD, 0.4"/10.2mm high

Polarity Indication Autopolarity ("–" for negative VIN)
Overrange Indication "–1___" for negative VIN

"1___" for positive VIN

Physical/Environmental
Operating Temperature 0--+60°C
Storage Temperature –20 -- +75 °C
Humidity (Non-condensing) 0 -- 95 %
Case Material Polycarbonate
Weight 0.75 ounces (21 grams)

DMS-30LCD

Performance/Functional Specifications

Typical at TA = +25°C and supply voltage = +5V (using the single-ended input circuit) or +9V
(using the differential input circuit), unless otherwise noted.

➀

Applies for transient or continuous overvoltages applied to (+) INPUT
HI (pin 11) with (–) INPUT LO (pin 12) properly connected. Pin 12 is
not overvoltage protected (see Figure 1). Voltages applied to pin 12
should not exceed the supply voltage.

➁

Listed spec applies to 5V-powered models only. For 9V-powered

models, both (–) INPUT LO (pin 12) and (+) INPUT HIGH (pin 11)
must always be at least 1.5V above –BATTERY (pin 3) and at least

1.5V below +BATTERY (pin 1).

➂

See Technical Notes.

DMS-30LCD - 1 - 5

Input Range:

0 = ±200mV
1 = ±2V
2 = ±20V
3 = ±200V

Accessories:

DMS-30-CP Panel cutout punch
DMS-BZL1 DMS-30 bezel assembly
DMS-BZL2 DMS-30 bezel assembly with sealing gasket
RN-DMS Gain/offset potentiometer kit for DMS-EB,

DMS-EB-AC/DC and DMS-EB-DC/DC

Add-On Application Boards:

DMS-EB Multi-purpose (gain/offset, 4-20mA, etc.)
DMS-EB-HTB High-accuracy temperature probe sensing for

±200mV models

DMS-EB-DC/DC Provides isolated +5V power
DMS-EB-TCJ J-type thermocouple inputs for ±2V models
DMS-EB-TCK K-type thermocouple inputs for ±2V models
DMS-EB-RMS For true rms measurements of ac voltages
DMS-EB-AC/DC For ac line-powered applications
DMS-EB-LP For 4-to-20mA loop-powered applications

Leave blank for standard
models.
Add B for backlit models.

Power Source:

5 = +5V
9 = +9V

T echnical Notes

1. +1.23V REFERENCE OUTPUT (Pin 9): This pin is the output of

the meter’s precision +1.23V internal reference, and it is referenced
to ANALOG COMMON (pin 10) which sits at a potential of
approximately +2V. This output should be buffered if used to drive
external loads since sourcing more than 15µA from pin 9 can affect
both the initial accuracy and temperature drift of the meter.

2. ANALOG COMMON (Pin 10): This pin is connected to an internal,
low-noise, "relative" ground. It is used in certain differential and
"floating" measurements as described in the Applications section of
this data sheet and Ap Note 3 of the DATEL Panel Meter Catalog.

Pin 10 should not be connected to pin 3 (5V RETURN/
–BATTERY) or to your system’s analog ground.

3½ DIGIT, LCD DISPLAY DIGITAL PANEL VOLTMETERS

Ordering Information

A panel-mount retaining clip is supplied with each model.

Order on-line at www.datel.com