DATEL DMS-40LCD-1-2-9, DMS-40LCD-1-2-5B, DMS-40LCD-1-2-5, DMS-40LCD-0-1-9B, DMS-40LCD-0-1-9 Datasheet

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

4½ Digit, LCD Display

Low-Power, Miniature

Digital Panel Voltmeters

DMS-40LCD Series

Figure 1. DMS-40LCD Series Simplified Schematic

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Scientific-grade accuracy, ±2 counts

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Low power, typically 12.5mW

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Miniature size:

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

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Large (0.4"/10.2mm), enhanced­contrast, 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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3 differential, dual, input voltage ranges

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Single +5V supply or 9V battery

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User-selectable decimal point placement

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Low-battery "BAT" annunciator

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0 to +50°C temperature range

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Low Cost

Offering a unique combination of low cost, scientific-grade accuracy (±2 counts),
component-like convenience and outstanding reliability, DMS-40LCD Series 4½ Digit
DPM's provide the ultimate combination of price, precision and convenience. These
miniature (2.17" x 0.92" x 0.43") digital voltmeters combine an advanced, autozeroing
A/D converter, a precision reference circuit and a large (0.4"/10.2mm high), easy-to­read LCD display in a single, fully encapsulated, 12-pin DIP package. All models
incorporate a built-in bezel and are easily mounted in either panels or pc boards.

Each DMS-40LCD meter has a dual-range, differential, input configuration
(±200mV/±2V, ±2V/±20V or ±20V/±200V) and is available with a backlit or non-backlit
display. Input impedance is a minim um 800k Ω, and CMRR is typically 86dB (dc to
60Hz). CMV is ±2V, and all models are overvoltage protected to ±250V (on their non­inverting inputs).

All DMS-40LCD meters are fully functional and operate from a single +5V supply
(drawing 3.5mA max.) or a single 9V supply/battery (drawing 2.5mA max.). All models
feature autopolarity changeover and overrange indication. A displa y HOLD function is
standard on all non-backlit models.

Thanks to their rugged epoxy-based encapsulation and their advanced, factory­calibrated A/D converters, DMS-40LCD meters are able to withstand the harshest
environments and never require adjustment or calibration. Plug-in convenience, long­term stability and wide operating temperature range (0 to +50°C) make DMS-40LCD
meters the right solution for any high-accuracy DPM requirement.

Features

Actual Size

(+) INPUT HI

(–) INPUT L

O

ANALOG
COMMON

REFERENCE
IN/OUT

+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

»

+2.2V

DATA

V+

V–

A/D

CONVERTER

0 Vdc

0.01µF

J1

BAT

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R1 = 100k on ±200mV/±2V (-0/1) models and 909k on all other models.
R2 is not used on ±200mV/±2V (-0/1) models.
R2 = 101k on ±2V/±20V (-1/2) models and 9.2k on ±20V/±200V (-2/3) models.

HOLD/
BACKLIGHT

BAT

➁ DC/DC converter is not used on 9V-powered models,

J1 is connected.

RANGE

SELECT

DP 4

➂ Hold function is not available on backlit models.

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www.datel.com

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DMS-40LCD - 0/1 - 5

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Each model in the DMS-40LCD Series offers two input voltage ranges
that are user-selectable via pin strapping. 5V-powered models can be
used to perform either differential or single-ended measurements. 9V­powered models can only be used for differential measurements.

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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.

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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).

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See Technical Notes.

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.

DMS-40LCD

T echnical Notes

1. Input V oltage Range Selection: Each model in the DMS-40LCD

Series offers two, user-selectable, input voltage ranges as
indicated in the Perfor mance/Functional Specifications Table and
the Ordering Information. To select the higher range of any
device (such as the ±2V range for the DMS-40LCD-0/1), connect
pin 2 (RANGE SELECT) to pin 1 (+5V SUPPLY/+BATTERY). To
select the lower range, leave pin 2 open.

2. Decimal Point Placement: The location of the decimal point is
user-selectable, and the decimal point control pins (DP1-DP4)
are active low functions. Select the appropriate decimal point by
tying the appropriate pin (pin 4, 5, 6 or 8) to pin 3 (5V RETURN/
–BATTERY). Unused decimal point location pins should be left
open. For 5V-powered models, the decimal location pins are TTL
compatible and may be hard wired as described above or driven
with 5V TTL logic gates.

3. Low Battery Annunciator: The "BAT" annunciator in the upper
left-hand corner of the display turns on when the supply voltage
for 5V-powered models falls below approximately +3.75V or when
the supply voltage for 9V-powered models falls below approxi­mately 7.2V. This function can not be disabled.

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

Power Source:

5 = +5V
9 = +9V

Accessories:

DMS-30-CP Panel cutout punch
DMS-BZL1 DMS-40 bezel assembly
DMS-BZL2 DMS-40 bezel assembly with sealing gasket
DMS-EB Application/evaluation board with standard

MOLEX connector, decimal point solder pads
and attenuation resistor pads.

4½ DIGIT, LCD DISPLAY DIGITAL PANEL VOLTMETERS

Ordering Information

Input Ranges:

0/1 = ±200mV/±2V
1/2 = ±2V/±20V
2/3 = ±20V/±200V

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

Analog Inputs Min. Typ. Max. Units
Full Scale Input Range:

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DMS-40LCD-0/1 -- ±200/±2 -- mV/V
DMS-40LCD-1/2 -- ±2/±20 -- V/V
DMS-40LCD-2/3 -- ±20/±200 -- V/V

Input Impedance:

DMS-40LCD-0/1 100 1000 -- M

Ω

DMS-40LCD-1/2 0.8 1 -- M

Ω

DMS-40LCD-2/3 0.8 1 -- M

Ω

Overvoltage Protection

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-- -- ±250 Volts

Common Mode Voltage Range

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-- -- ±2 Volts

CMRR (dc to 60Hz) -- 86 -- dB
Control Inputs ➃
Decimal Point Placement (Pins 4-6, 8):

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

Hold/Backlight Functionality (Pin 9):

Backlit Models Tie to pin 3 to turn on backlight
Non-backlit Models Tie to pin 3 to hold last reading

Performance
Sampling Rate 2.5 samples per second
Accuracy (3 minute warm-up):

DMS-40LCD-0/1 (VIN = +0.19/1.9V) -- ±2 ±3 Counts
DMS-40LCD-1/2 (VIN = +1.9V) -- ±2 ±3 Counts
DMS-40LCD-1/2 (VIN = +19V) -- ± 3 ±4 Counts
DMS-40LCD-2/3 (VIN = +19/190V) -- ±3 ±4 Counts

Zero Reading (VIN = 0 Volts) "–0001" "0000" "0001"
Temperature Drift (0 to +50°C):

DMS-40LCD-0/1 -- ±0.4 ±0.8 Cnts/°C
DMS-40LCD-1/2 -- ±0.6 ±1 Cnts/°C
DMS-40LCD-2/3 -- ±0.6 ±1 Cnts/°C

Power Supply Requirements (5V Models)
Supply Voltage +4.75 +5.00 +5.25 Volts
Supply Current:

Standard Models -- +2.5 +3.5 mA
Backlit Models -- +37 +45 mA

Power Supply Requirements (9V Models

)

Supply Voltage +7.5 +9.0 +14.0 Volts
Supply Current:

Standard Models -- +1.5 +2.5 mA
Backlit Models -- +37 +45 mA

Display
Display Type and Size 4½ Digit LCD, 0.4"/10.2mm high
Polarity Indication Autopolarity ("–" for negative VIN)
Overrange Indication "–1____" for negative VIN

"1____" for positive V IN

Physical/Environmental
Operating Temperature 0--+50°C
Storage Temperature –20 -- +75 °C
Humidity (Non-condensing) 0 -- 95 %
Case Material Polycarbonate
Weight 0.75 ounces (21 grams)

Order on-line at www.datel.com