Datasheet DMS-20PC (Murata)

www.murata-ps.com DMS-20PC Series
3½ Digit, LED Display, Low-Cost, Subminiature Digital Panel Voltmeters New Low-power blue and green LEDs
FEATURES
DMS-20PC Series, 3½ Digit, LED Display, Digital Panel Voltmeters combine a preci-  sion A/D converter; a factory-trimmed, highly stable, voltage reference; and a large Lowest-cost LED meters (0.37"/9.4mm), easy-to-read LED display in a single package that is only slightly larger  Subminiature size: than the display itself. Displays are offered in either red, orange, amber, yellow, green or 1.38" x 0.88" x 0.48" (35mm x 22mm x 12mm) blue colors. High-intensity and low-power (35mW total) red LEDs are also optional.  Large (0.37"/9.4mm) LED display 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 fi lters and Choice of 6 LED colors bezels; are moisture and vibration proof; and function well in the harshest environments.  High-intensity or low-power (7mA) red LEDs optional Their 12-pin, dual-in-line confi guration offers component-like, plug-in convenience and  Epoxy-encapsulated, 12-pin DIP package with built-in maximum versatility. Operating temperature range is 0 to +60°C. color fi lter and bezel The meters come with one of four, differential, input voltage ranges: ±200mV, ±2V  ±20V or ±200V. Input impedance is a minimum 800kΩ. CMRR is typically 86dB (dc to 4 differential input voltage ranges 60Hz), and CMV is ±2V. Input overvoltage protection (on the non-inverting input) is ±250V.  Factory calibrated, ±1 count accuracy Devices are fully calibrated at the factory to an accuracy of ±1 count (±0.05% of full scale  Single +5V power supply range) and never require calibration or adjustment.  A DISPLAY ENABLE function permits the display to be disabled for "power-down" User-selectable decimal point placement operation. All models have a DISPLAY TEST function. Standard red LED models offer an  DISPLAY ENABLE function for "power-down" mode optional DISPLAY HOLD function.  DISPLAY TEST and HOLD (optional) functions Small size, low cost and adjustment-free reliability make the DMS-20PC Series the best  choice for all your 3½ digit, LED, DPM applications. 0 to +60°C temperature range
SIMPLIFIED SCHEMATIC DIAGRAM
+5V 1 12 V+ +5V SUPPLY (–) INPUT LO 1 2 R2 0.01 –5V µF 2 R1 11 DISPLAY DC/DC (+) INPUT HI ENABLE CONVERTER V– 909k »+2.0V 3 10 A/D ANALOG 5V RETURN CONVERTER COMMON 0 Vdc DATA 4 9 DISPLAY 3 DP 3 TEST/HOLD 5 8 DP 2 +5V REFERENCE OUT 6 7 DP 1 REFERENCE IN 1 R2 is not used on ±200mV (-0) models or ±2V (-1) models. 2 Only used on ±200mV (-0) and ±2V (-1) models. R2 = 100k on ±20V (-2) models and 9.1k on ±200V (-3) models. 3 Pin 9 is DISPLAY TEST on all but eight models. On those models (-H option), it is DISPLAY HOLD. For full details go to
www.murata-ps.com/rohs Figure 1. DMS-20PC Series simplifi ed schematic www.murata-ps.com/support MPM_DMS_20PC.F01
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