DMS-20LCD Series www.murata-ps.com 3 Digit, LCD Display Digital Panel Voltmeters DMS-20LCD Series, 3 Digit, LCD Display, Digital Voltmeters represent the ultimate FEATURES combination of low price, low power, small size and high performance in digital meters. Lowest cost Epoxy encapsulated in a subminiature (1.38 x 0.88 x 0.43), 12-pin DIP package, these Lowest power, 2mW completely self-contained, fully operational meters offer a combination of ruggedness, Subminiature size: long-term reliability and component-like ease-of-use simply not available in any other 1.38 x 0.88 x 0.43 meters. 35mm x 22mm x 11mm Incorporating a precision reference and a factory-calibrated, autozeroing A/D converter, DMS-20LCD meters are extremely accurate (1 count) and are only slightly larger than Large (0.37 /9.4mm), enhanced-contrast LCD display their 0.37 /9.4mm, enhanced-contrast, LCD displays. All models incorporate a built-in Epoxy-encapsulated, 12-pin DIP bezel and are easily mounted in either panels or pc boards. Both backlit and non-backlit Panel or pc-board mountable versions are available. 4 differential input voltage ranges DMS-20LCD meters have 4 differential input voltage ranges (200mV, 2V, 20V and 200V) and a user-friendly input structure. Input impedance is a minimum 800k. CMRR High accuracy, 1 count (0.05%) is typically 86dB with a CMV of 2V. Non-inverting inputs are overvoltage protected to Single +5V supply or 9V battery 100V (250V for the 200V input model). Low-battery annunciator All DMS-20LCD meters operate from a single +5V supply (drawing 400A) or a single User-selectable decimal point placement +9V supply/battery (drawing 230A). All models have a low-battery ) annunciator and feature autopolarity changeover and overrange indication. 0 to +60C temperature range Also available is an application/evaluation board (DMS-EB2) that plugs directly onto the back of any DMS-20LCD allowing direct inputs for common applications such as 4-20mA inputs, zero/gain adjust, decimal point location, and input voltage dividing. SIMPLIFIED SCHEMATIC DIAGRAM +5V 12 1 +5V SUPPLY/ V+ () INPUT LO +BATTERY 1 2 R2 0.01F 5V 3 R1 2 11 DC/DC N.C. (+) INPUT HI CONVERTER V 909k +2.0V 3 10 J1 ANALOG 5V RETURN/ A/D BATTERY COMMON CONVERTER 0 Vdc DATA 9 4 4 DP 3 N.C./BACKLIGHT 5 8 DP 2 REFERENCE OUT +5V 6 7 DP 1 REFERENCE IN 3 1 R2 is not used on 200mV (-0) models or 2V (-1) models. DC/DC converter is not used on 9V-powered models, R2 = 100k on 20V (-2) models and 9.1k on 200V (-3) models. J1 is connected. 2 4 Only used on 200mV (-0) and 2V (-1) models. Used on backlit models only. N.C. for non-backlit models. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MPM DMS20LCD.C01 Page 1 of 6DMS-20LCD Series 3 Digit, LCD Display Digital Panel Voltmeters Performance/Functional Speci cations Typical at TA = +25C and supply voltage = +5V (using the single-ended input circuit) or +9V (using the differential input circuit), unless otherwise noted. Physical/Environmental Analog Inputs Min. Typ. Max. Units Operating Temperature 0 +60 C Full Scale Input Range: Storage Temperature 20 +75 C DMS-20LCD-0 200 mV Humidity (non-condensing) 0 95 % DMS-20LCD-1 2 Volts Case Material Polycarbonate DMS-20LCD-2 20 Volts Weight 0.4 ounces (11 grams) DMS-20LCD-3 200 Volts Input Impedence: Applies for transient or continuous overvoltages applied to (+) INPUT HI (pin 11) with () INPUT LO (pin 12) properly connected. Pin 12 is not DMS-20LCD-0, -1 100 1000 M overvoltage DMS-20LCD-2, -3 0.8 1 M protected (see Figure 1). Voltages applied to pin 12 should not exceed the supply voltage. Overvoltage Protection Listed spec applies to 5V-powered models only. For 9V-powered models, both DMS-20LCD-0, -1, -2 100 Volts () INPUT LO (pin 12) and (+) INPUT HIGH (pin 11) must always be at least DMS-20LCD-3 250 Volts 1.5V above BATTERY (pin 3) and at least 1.5V below +BATTERY (pin 1). See Technical Notes. Common Mode Voltage Range 2 Volts CMRR (dc to 60Hz) 86 dB Ordering Information Control Inputs DMS-20LCD - 1 - 5 - C Decimal Pt. Placement (Pins 4-6) Tie to pin 3 to activate Add -C for RoHS Functionality Tie to pin 3 to activate Logic Compatibility TTL (on 5V-powered models) Input Range: Leave blank for standard 0 = 200mV Backlight (Pin 9) Tie to pin 3 to turn on backlight models. 1 = 2V Add B for backlit models. Performance 2 = 20V 3 = 200V Sampling Rate 2.5 reading per second Power Source: 5 = +5V Accuracy (1 minute warm-up): 9 = +9V Accessories: DMS-20PC-0 (Vin = +0.19V) 1 2 Counts DMS-20-CP Panel cutout punch DMS-20PC-1 (Vin = +1.9V) 1 2 Counts DMS-BZL3-C DMS-20 bezel assembly DMS-BZL4-C DMS-20 bezel assembly with sealing gasket DMS-20PC-2 (Vin = +19V) 2 3 Counts DMS-EB2-C Application/evaluation board with standard DMS-20PC-3 (Vin = +190V) 2 3 Counts MOLEX connector, decimal point solder pads and attenuation resistor pads. Zero Reading (Vin = 0 Volts) 001 000 001 A panel-mount retaining clip is supplied with each model. Temperature Drift (0 = +60C) 0.2 0.4 Cnts/C See www.murata-ps.com/dpm-availability for model-speci c availability. Power Supply Requirements (5V Models) Supply Voltage +4.75 +5.00 +5.25 Volts TECHNICAL NOTES Supply Current: Standard Models +400 +650 A 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 Backlit Models +35 +50 mA must be tied to pin 7 to achieve all listed accuracy and drift speci ca- Power Supply Requirements (9V Models) tions. Supply Voltage +7.5 +9.0 +14.0 Volts 2. ANALOG COMMON (Pin 10): This pin is connected to an internal, Supply Current: low-noise, relative ground. It is used in certain differential and oat- Standard Models +230 +350 A ing measurements as described in the Applications section of this data Backlit Models +35 +50 mA sheet and Ap Note DMS-AN3 at