FEATURES Complete, No External Components Needed Small Size: x 0.4" Module Input: to +10V; Output: to 20mA Low Drift: 0.005%/°C max; Nonlinearity: 0.005% max (2B20B) Wide Temperature Range: to +85°C Single Supply: to +32V Meets ISA Std 50.1 for Type 3, Class L and U, Nonisolated Current Loop Transmitters Economical APPLICATIONS Industrial Instrumentation and Control Systems D/A Converter - Current Loop Interface Analog Transmitters and Controllers Remote Data Acquisition Systems
GENERAL DESCRIPTION Model is a complete, modular voltage-to-current converter providing the user with a convenient way to produce a current output signal which is proportional to the voltage input. The nominal input voltage range to +10V. The output current range to 20mA into a grounded load. Featuring low drift (0.005%/°C max, 2B20B) over the to +85°C temperature range and single supply operation to +32V), model 2B20 is available in two accuracy grades. The 2B20B offers precision performance with nonlinearity error of 0.005% (max) and guaranteed low offset error of ±0.1% max and span error of ±0.2% max, without external trims. The is an economical solution for applications with lesser accuracy requirements, featuring nonlinearity error of 0.025% (max), offset error of ±0.4% (max), span error of ±0.6% (max), and span stability of 0.01%/°C max. The 2B20 is contained in a small x 0.4"), rugged, epoxy encapsulated package. For maximum versatility, two signal input (VIN1 and VIN2) and two reference input (REFIN1 and REFIN2) terminals are provided. Utilizing terminals VIN1 and REFIN1 eliminates the need for any external components, since offset and span are internally calibrated. If higher accuracy (up ±0.01%) is required, inputs VIN2 and REFIN2 with series trim potentiometers may be utilized. APPLICATIONS Model 2B20 has been designed for applications in process control and monitoring systems to transmit information between subsystems or separated system elements. The 2B20 can serve as a transmission link between such elements of process control system as
transmitters, indicators, controllers, recorders, computers, actuators and signal conditioners. In a typical application, model 2B20 may act as an interface between the D/A converter output of a microcomputer-based system and a process control device such as a variable position valve. Another typical application of the 2B20 may as a current output stage of a proportional controller to interface devices such as current-to-position converters and current-to-pneumatic transducers. DESIGN FEATURES AND USER BENEFITS Process Signal Compatibility: To provide output signal compatibility, the 2B20 meets the requirements of the Instrument Society of America Standard S50.1, "Compatibility of Analog Signals for Electronic Industrial Process Instruments" for Type 3, Class L and U, nonisolated current loop transmitters. External Reference Use: For increased flexibility, when ratiometric operation is desired, the 2B20 offers a capability of connecting an external reference (i.e., from multiplying D/A converter) to the REFIN2 terminal. Wide Power Supply Range: A wide power supply range to +32V dc) allows for operation with either a +12V battery, a +15V powered data acquisition system, a +24V powered process control instrumentation.
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