Analog Devices AD2038 Datasheet

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ANALOG
W DEVICES
6 Channel Scanning
0igitalVoltmeter
/
Thermometer
PRELIMINARY TECHNICAL DATA
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)
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.
AD2038: Temperature Monitoring in laboratory, Manu-
facturing, and Quality Control
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 multi-
channel analog data. With appropriate external signal condi-
tioning 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 chan-
nel independent of selection mode. The channel select output
together with converted BCD output provides complete infor-
mation for automatic data collection. For applications where
there are high common mode voltages (CMV) present, the
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Information furnished by Analog Devices is believed to be accurate
and reliable. However, no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
/.'
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 thermo-
meter. Based on the AD203 7 and designed to be used in con-
junction with Analog Devices' AD590 Temperature Transdu-
cer, 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 tempera-
tures 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 propor-
tional to absolute temperature thus eliminating the need for
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