2

DMS-20PC

3 ½

DIGIT ,

LED

DISPLA Y

DIGIT AL

P ANEL V O L TMETERS

Performance/Functional Specifications

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 See Technical Notes.

➂ The DISPLAY HOLD function is optional on standard red and green LED models only.

See Ordering Information.

Leave blank for standard

models.

Add -H for DISPLAY

HOLD option (available on

standard red and green

LED models only).

DMS-20PC - 1 - RS

LED Color:

AS = Standard Amber

GS = Standard Green

OS = Standard Orange

RS = Standard Red

YS = Standard Yellow

RH = High-Intensity Red

RL = Low-Power Red

Accessories:

DMS-20-CP

Panel cutout punch

DMS-BZL3

DMS-20 bezel assembly

DMS-BZL4

DMS-20 bezel assembly with sealing gasket

DMS-EB2

Application/evaluation board with standard

MOLEX connector, decimal point solder pads

and attenuation resistor pads.

Technical Notes

1. REFERENCE OUTPUT (Pin 8) and INPUT (Pin 7): Pin 8 is a

precision reference actively trimmed at the factory. In normal

operation, pin 8 must be tied to pin 7 to achieve all listed accuracy

and drift specifications.

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) or to

your system’s analog ground.

3. Decimal Point Placement: The location of the decimal point is

user-selectable, and the decimal point control pins (DP1-DP3) are

active low functions. Select the appropriate decimal point by tying

the appropriate pin (pin 4, 5 or 6) to pin 3 (5V RETURN). Unused

decimal point location pins should be left open.

Hard wiring is preferable, however, you can use logic gates to

exercise dynamic control over the location of the decimal point if the

following drive conditions are met:

Model

Applied "0" Voltage

Load Current*

DMS-20PC-X-RL

+0.05V max.

0.7mA max.

All Others

+0.4V max.

6mA max.

* The driving gates must be able to sink this much current

Ordering Information

Input Range:

0 = ±200mV

1 = ±2V

2 = ±20V

3 = ±200V

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

Analog Inputs

Min.

Typ.

Max.

Units

Full Scale Input Range:

DMS-20PC-0

--

±200

--

mV

DMS-20PC-1

--

±2

--

Volts

DMS-20PC-2

--

±20

--

Volts

DMS-20PC-3

--

±200

--

Volts

Input Impedance:

DMS-20PC-0, -1

100

1000

--

M

Ω

DMS-20PC-2, -3

0.8

1

--

M

Ω

Overvoltage Protection ➀

--

--

±250

Volts

Common Mode Voltage Range

--

--

±2

Volts

CMRR (dc to 60Hz)

--

86

--

dB

Control Inputs ➁ ➂

Decimal Point Placement (Pins 4-6)

Tie to pin 3 to activate

Display Test (Pin 9)

Tie to pin 1 to activate all segments

Display Hold (Pin 9) ➂

Tie to pin 1 to hold last reading

Performance

Sampling Rate

2.5 samples per second

Accuracy (3 minute warm-up):

--

±1

±3

Counts

--

±1

±3

Counts

--

±2

±3

Counts

--

±2

±3

Counts

"– 001"

"000"

"001"

Temperature Drift (0 to +60°C)

--

±0.2

±0.4

Cnts/°C

Power Supply Requirements

Supply Voltage

+4.75

+5.00

+5.25

Volts

Supply Current:

DMS-20PC-X-RS

--

+60

+90

mA

DMS-20PC-X-RL

--

+7

+12

mA

DMS-20PC-X-AS

--

+90

+120

mA

DMS-20PC-X-GS

--

+90

+120

mA

DMS-20PC-X-OS

--

+90

+120

mA

DMS-20PC-X-YS

--

+90

+120

mA

DMS-20PC-X-RS-H

--

+60

+90

mA

DMS-20PC-X-GS-H

--

+90

+120

mA

DMS-20PC-X-RH

--

+60

+90

mA

Display

Display Type and Size

3½ Digit LED, 0.37"/9.4mm high

Polarity Indication

Overrange Indication

Physical/Environmental

Operating Temperature

0--

+60

°C

Storage Temperature

– 40

--

+75

°C

Humidity (Non-condensing)

0

--

95

%

Case Material

Polycarbonate

Weight

0.4 ounces (11 grams)

Order on-line at www.datel.com