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0 to +60擄C temperature range
DMS-20PC Series, 3錕?frac12; 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擄C.
The meters come with one of four, differential, input voltage ranges: 鹵200mV, 鹵2V
鹵20V or 鹵200V. Input impedance is a minimum 800k鈩? CMRR is typically 86dB (dc
to 60Hz), and CMV is 鹵2V. Input overvoltage protection (on the non-inverting input)
is 鹵250V. Devices are fully calibrated at the factory to an accuracy of 鹵1 count
(鹵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 3錕?frac12; digit, LED, DPM applications.
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+5V SUPPLY
+5V
V+
0.01
碌F
V鈥?/div>
祿
+2.0V
2
12
(鈥? INPUT LO
R2
1
鈥?V
DISPLAY 2
ENABLE
DC/DC
CONVERTER
R1
909k
11
(+) INPUT HI
3
5V RETURN
0 Vdc
A/D
CONVERTER
DATA
10 ANALOG
COMMON
4
DP 3
9 DISPLAY
3
TEST/HOLD
5
DP 2
+5V
8
REFERENCE OUT
6
DP 1
7
REFERENCE IN
1
R2 is not used on 鹵200mV (-0) models or 鹵2V (-1) models.
R2 = 100k on 鹵20V (-2) models and 9.1k on 鹵200V (-3) models.
2
3
Only used on 鹵200mV (-0) and 鹵2V (-1) models.
Pin 9 is DISPLAY TEST on all but eight models. On those models
(-H option), it is DISPLAY HOLD.
Figure 1. DMS-20PC Series Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA)
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Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356
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E-mail: sales@datel.com
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Internet: www.datel.com
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