AD2038| Datasheet

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6 Channel Scanning 0igitalVoltmeter Thermometer /

OBS
AD2038:

FEATURES Automatic Scan of 6.Channel Inputs Manual Selection of Individual Channel External Channel Selection by BCD Code :t199.9mV or :t1.999V dc Full Scale Range Isolated Analog Input Parallel BCD Output Accessible Gain Points for Implementation of Selectable Gain, to 6V dc F .S. :t12V dc and +5V dc for External Use AD2038: High Accuracy Temperature Measurements Used with AD590 Transducer 0.1 Resolution; 6 Channels -55.0 C to +150.0 C (-67.0 F to +199.9 F)

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APPLICATIONS AD2037: Multi-point Measurements for Data Acquisition, logging and Control Data Processing from: Pressure and Flow Transducers; RTD and Thermistor Transducers; AD590 Temperature Transducers; l VDT and level Transducers; Voltage and Current Sources. Temperature Monitoring in laboratory, facturing, and Quality Control Manu-

OLE

AD2037 has as a standard feature, a floating opto isolated analog front end that will withstand CMV's up to 2 50V rms. The :!:199.9mV full scale range or :!:1.999V dc full scale range are user selectable via a jumper on the rear connector. Other full scale ranges, to 6V dc, are programmable, via one (1) external resistor. AD2038 GENERAL DESCRIPTION The AD2038 is a dedicated 6 channel digital scaQning thermometer. Based on the AD203 7 and designed to be used in conjunction with Analog Devices' AD590 Temperature Transducer, the AD2038 retains all of the input/output features of the AD2037 as well as the channel selection methods. The AD2038 and AD590 will measure and display temperatures to :t1.3 C accuracy over the temperature range of -55.00e to +150.00e (-67.0oF to 200.0 F), over limited temperature ranges around a calibration point, accuracies approach a few tenths of a degree. The AD590 is a laser trimmed, two terminal IC Temperature Sensor. Its output is a current (lJ,lA per oK) linearly proportional to
absolute temperature thus eliminating the need for (continued on page 3)

AD2037 GENERAL DESCRIPTION The AD2037 is a low cost 3 1/2 digit, ac line powered, 6 channel digital scanning voltmeter designed to interface to printers, computers, serial data transmitters, telephone lines, etc., for display, control, logging or transmission of multichannel analog data. With appropriate external signal conditioning on each channel, the AD203 7 becomes a versatile building block for a broad range of data acquisition, data logging, or control applications. Channel selection is made via three methods: manual, using the switch provided on the front; Auto/Scan, where the AD2037 cycling on an internal clock can continually scan the 6 input channels; or External selection, where control inputs provided on the rear connector enables channel selection via external BCD code. A separate channel select output identifies the selected channel independent of selection mode. The channel select output together with converted BCD output provides complete information for automatic data collection. For applica
tions where there are high common mode voltages (CMV) present, the

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