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GENERAL DESCRIPTION

The AD74115H is a single-channel, software-configurable, input

and output device for industrial control applications. The AD74115H

provides a wide range of use cases, integrated on a single chip.

These use cases include analog output, analog input, digital output,

digital input, resistance temperature detector (RTD), and thermocouple

measurement capability. The AD74115H also has an integrated

HART modem. A serial peripheral interface (SPI) is used to

handle all communications to the device, including communications

with the HART modem. The digital input and digital outputs can

be accessed via the SPI or the general-purpose input and output

(GPIO) pins to support higher speed data rates.

The device features a 16-bit, Σ-Δ analog-to-digital converter (ADC)

and a 14-bit digital-to-analog converter (DAC). The AD74115H

contains a high accuracy 2.5 V on-chip reference that can be used

as the DAC and ADC reference.

Power and isolation can be provided using the ADP1034 companion

product. When using the ADP1034 and AD74115H together,

programmable power control (PPC) is available on the positive

analog supply, AVDD, which allows for an optimized power solution

in the end application. An on-chip charge pump can be enabled if

unipolar capability is required.

FEATURES

? Single-channel software configurable input and output

? Multiple configurable modes to a single pin

? Voltage input

? Current input

? Voltage output

? Current output

? Digital input

? Digital output

? 2-wire, 3-wire, or 4-wire RTD measurements

? Thermocouple measurement

? Overvoltage tolerant on screw terminal facing pins, powered or

unpowered

? Auxiliary high voltage sense pins

? 10 ppm/°C reference temperature coefficient

? 16-bit, Σ-Δ ADC with optional 50 Hz and 60 Hz rejection

? 14-bit monotonic DAC

? Unipolar and bipolar capability

? Integrated HART modem

? On-chip diagnostics including open-circuit and short-circuit detection

? Internal temperature sensor, ±5°C accuracy

? SPI-compatible

? Wide power supply range

? Programmable power control

? Temperature range: ?40°C to +105°C

? 48-lead LFCSP

APPLICATIONS

? Isolated industrial control systems

? Process control

? Factory automation

? Building control systems