FEATURES4–20 mA, 0–20 mA Output RangesPrecalibrated Input Ranges: 0 V to 2 V, 0 V to 10 VPrecision Voltage Reference Programmable to 2.000 V or 10.000 VSingle or Dual Supply OperationWide Power Supply Range: 4.5 V to 36 VWide Output ComplianceInput Buffer AmplifierOpen-Loop AlarmOptional External Pass Transistor to Reduce Self-Heating Errors0.002% Typ Nonlinearity
PRODUCT DESCRIPTION
The AD694 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 commonly 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 input 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.
Active laser trimming of the AD694’s thin film resistors results
in high levels of accuracy without the need for additional adjustments and calibration. An external pass transistor may be used
with the AD694 to off-load power dissipation, extending the
temperature range of operation.
The AD694 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 transmission 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.
The AD694 is available in hermetically seaLED, 16-pin CERDIP
and plastic SOIC, specified over the –40°C to +85°C industrial
temperature range, and in a 16-pin plastic DIP, specified over
the 0°C to +70°C temperature range.
PRODUCT HIGHLIGHTS
1. The AD694 is a complete voltage in to 4–20 mA out current
transmitter.
2. Pin programmable input ranges are precalibrated at 0 V to
2 V and 0 V to 10 V.
3. The input amplifier may be configured to buffer and scale the
input voltage, or to serve as an output amplifier for current
output DACs.
4. The output voltage compliance extends to within 2 V of the
positive supply and below common. When operated with a
5 V supply, the output voltage compliance extends 30 V below common.
5. The AD694 interfaces directly to 8-, 10-, and 12-bit single
supply CMOS and bipolar DACs.
6. The 4 mA zero current may be switched on and off with a
TTL control pin, allowing 0–20 mA operation.
7. An open collector alarm warns of loop failure due to open
wires or noncompliance of the output stage.
8. A monitored output is provided to drive an external pass
transistor. The feature off-loads power dissipation to extend
the temperature range of operation and minimize self-heating
error.
专业代理，全新到货，大量现货欢迎询问！！！
质优价廉，品质保证！
批号：13+
专业代理全线产品，优势的进货渠道，专业的销售团队，一手货源，全国最低价供应！
为您提供专业、快捷、可靠的产品
深圳德田科技有限公司
Shenzhen Spring Technology Co.,Ltd
地址：深圳市福田区振华路122号海外装饰大厦A座201B室
Shenzhen futian district zhenhua road 122 overseas decoration building, room 211, block A, 518031
李先生
电话（Tel）：(+86-755) 8350 5153
传真（Fax）：(+86-755) 8350 2530
邮箱: info@dt-ic.com
网址：www.dt-ic.com