AD694 DATASHEET PDF

The AD is a monolithic current transmitter that accepts high level signal inputs to drive a standard 4—20 mA current loop for the control of valves, actuators, and other devices com- monly used in process control. The input signal is buffered by an input amplifier that can be used to scale the input signal or buffer the output from a current mode DAC. Precalibrated in- put spans of 0 V to 2 V and 0 V to 10 V are selected by simple pin strapping; other spans may be programmed with external resistors. The output stage compliance extends to within 2 V of VS and its special design allows the output voltage to extend below common in dual supply operation. An alarm warns of an open 4—20 mA loop or noncompliance of the output stage.

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The AD is a monolithic current transmitter that accepts high level signal inputs to drive a standard 4—20 mA current loop for the control of valves, actuators, and other devices com- monly used in process control.

The input signal is buffered by an input amplifier that can be used to scale the input signal or buffer the output from a current mode DAC. Precalibrated in- put spans of 0 V to 2 V and 0 V to 10 V are selected by simple pin strapping; other spans may be programmed with external resistors.

The output stage compliance extends to within 2 V of VS and its special design allows the output voltage to extend below common in dual supply operation. An alarm warns of an open 4—20 mA loop or noncompliance of the output stage. An external pass transistor may be used with the AD to off-load power dissipation, extending the temperature range of operation. The AD is the ideal building block for systems requiring noise immune 4—20 mA signal transmission to operate valves, actuators, and other control devices, as well as for the transmis- sion of process parameters such as pressure, temperature, or flow.

It is recommended as a replacement for discrete designs in a variety of applications in industrial process control, factory automation, and system monitoring. One Technology Way, P.

Box , Norwood, MA , U.

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AD694 Analog Devices, AD694 Datasheet

For this reason, span, offset, and nonlinearity are specified with the input amplifiers operating in their linear range. The input voltage used for the tests is 5 mV to 2 V and 5 mV to 10 V for the two precalibrated input ranges. Span and zero accuracy are tested with the buffer amplifier configured as a follower. See Note 1. The voltage reference output over temperature will fall inside of a box whose length is determined by the temperature range and whose height is determined by the maximum temperature coefficient multiplied by the temperature span in degrees C. Allowable temperature range of operation is dependent upon internal power dissipation.

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Page Reference Short Circuit to Common. Voltage Compliance vs. First, a single supply input amplifier buffers the high level, single-ended input signal. Adj Pin 6 allows the offset current to be adjusted to any cur- rent in the range 4. In normal mA operation, Pin 9 is connected to ground. Tying Pin potential greater turns off the 4 mA offset current

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