AD694 PDF

The operation of the AD can best be understood by dividing the circuit into three functional parts see Figure 1. First, a single supply input amplifier buffers the high level, single-ended input signal. Typical Minimum Supply Voltage vs. Functional Block Diagram The third section, a voltage reference and offset generator, is re- sponsible for providing the 4 mA offset current signal. Maximum RL vs.

Author:Tok Arashira
Country:Libya
Language:English (Spanish)
Genre:History
Published (Last):12 December 2004
Pages:490
PDF File Size:4.77 Mb
ePub File Size:14.39 Mb
ISBN:395-5-98646-331-6
Downloads:11571
Price:Free* [*Free Regsitration Required]
Uploader:Vozuru



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.

IEC 68-2-52 PDF

求助:有没有什么芯片可以代替AD694?

Circuit enclosed. But the OP requested mA. But, if you want the full precision available: The above is more concepuized-- basically two current sinks, one at a constant 4mA, and the other a Voltage to Current translator [V to mA]. The combination creates a 4 to 20mA transmitter, with a linear voltage to current transfer.

KALABHAIRAVA ASHTAKAM LYRICS IN TELUGU PDF

AD694 Bandwidth

The model number is a specific version of a generic that can be purchased or sampled. Status Status indicates the current lifecycle of the product. This can be one of 4 stages: Pre-Release: The model has not been released to general production, but samples may be available. Production: The model is currently being produced, and generally available for purchase and sampling. Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.

NBR 9513 PDF

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.

IDEAL SHREDDER 2260 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. An external pass transistor may be used with the AD to off-load power dissipation, extending the temperature range of operation.

Related Articles