DATEL, Inc., Mansfield, MA 02048 (USA)

• Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 • E-mail:sales@datel.com • Internet: www.datel.com

Features

DMS-20PC Series, 3½ Digit, LED Display, Digital Panel Voltmeters combine a

precision A/D converter; a factory-trimmed, highly stable, voltage reference; and a

large (0.37"/9.4mm), easy-to-read LED display in a single package that is only

slightly larger than the display itself. Displays are offered in either red, orange,

amber, yellow or green colors. High-intensity and low-power (35mW total) red LED's

are also optional.

These low-cost meters are fully self-contained and fully functional. Their

subminiature (1.38" x 0.88" x 0.48"), epoxy-encapsulated cases incorporate built-in

color filters and bezels; are moisture and vibration proof; and function well in the

harshest environments. Their 12-pin, dual-in-line configuration offers component-like,

plug-in convenience and maximum versatility. Operating temperature range is 0 to

+60°C.

The meters come with one of four, differential, input voltage ranges: ±200mV, ±2V

±20V or ±200V. Input impedance is a minimum 800k

Ω. CMRR is typically 86dB (dc

to 60Hz), and CMV is ±2V. Input overvoltage protection (on the non-inverting input)

is ±250V. Devices are fully calibrated at the factory to an accuracy of ±1 count

(±0.05% of full scale range) and never require calibration or adjustment.

A DISPLAY ENABLE function permits the display to be disabled for "power-

down" operation. All models have a DISPLAY TEST function. Standard red LED

models offer an optional DISPLAY HOLD function.

Small size, low cost and adjustment-free reliability make the DMS-20PC Series

the best choice for all your 3½ digit, LED, DPM applications.

Figure 1. DMS-20PC Series Simplified Schematic

••••• Lowest-cost LED meters

••••• Subminiature size:

1.38" x 0.88" x 0.48"

35mm x 22mm x 12mm

••••• Large (0.37"/9.4mm) LED display

••••• Choice of 5 LED colors

••••• High-intensity or low-power (7mA) red

LED's optional

••••• Epoxy-encapsulated, 12-pin DIP package

with built-in color filter and bezel

••••• 4 differential input voltage ranges

••••• Factory calibrated, ±1 count accuracy

••••• Single +5V power supply

••••• User-selectable decimal point placement

••••• DISPLAY ENABLE function for

"power-down" mode

••••• DISPLAY TEST and HOLD (optional)

functions

••••• 0 to +60°C temperature range

3½ Digit, LED Display

Low-Cost, Subminiature

Digital Panel Voltmeters

DMS-20PC Series

Actual Size

(+) INPUT HI

(–) INPUT LO

ANALOG

COMMON

REFERENCE OUT

REFERENCE IN

+5V SUPPLY

R1

DP 1

DP 2

DP 3

6

5

4

11

12

10

8

7

1

3

DC/DC

CONVERTER

2

5V RETURN

+5V

–5V

R2

» +2.0V

DATA

909k

V+

V–

A/D

CONVERTER

0 Vdc

0.01

µF

9

DISPLAY

ENABLE

+5V

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.

DISPLAY

TEST/HOLD

11

Pin 9 is DISPLAY TEST on all but eight models. On those models

(-H option), it is DISPLAY HOLD.

1

2

3

2

1

3

®®

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