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DAC7750IPWPR.B Datasheet(PDF) 36 Page - Texas Instruments

Part # DAC7750IPWPR.B
Description  DACx750 Single-Channel, 12-Bit and 16-Bit Programmable Current Output Digital-to-Analog Converters for 4-mA to 20-mA Current-Loop Applications
PDF  56 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

DAC7750IPWPR.B Datasheet(HTML) 36 Page - Texas Instruments

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9.1.1.2 Using the ISET-R Pin
The second method to implement HART is to couple the HART signal through the ISET-R pin when IOUT is
operated using an external RSET resistor. The FSK signal from the modem is ac-coupled into the pin through a
series combination of Rin and Cin as shown in Figure 9-2.
T2
T1
DAC
ISET-R
HART
Signal
Conditioning
R1
R3
R2
(ON Only in 4-mA
to 20-mA Range)
Cin
HART SIGNAL
RSET
15 NŸ
Rin
S1
+
A1
+
A2
CAP2
AVDD
CAP1
BOOST
R3-SENSE
IOUT
HART-IN
Figure 9-2. Implementing HART with the ISET-R pin
The magnitude of the ac-current output is calculated with Equation 6.
(VHART × k) / Rin
(6)
where
• VHART is the amplitude of the HART FSK signal from the modem
• k is a constant that represents the gain transfer function from the ISET-R pin to the IOUT pin and depends on
the selected current output range as follows:
– k = 60 for the 4-mA to 20-mA range
– k = 75 for the 0-mA to 20-mA range
– k = 90 for the 0-mA to 24-mA range
The series input resistor and capacitor form a high-pass filter at the ISET-R pin. Select Cin to make sure that all
signals in the HART extended-frequency band pass through unattenuated.
DAC7750, DAC8750
SBAS538D – DECEMBER 2013 – REVISED DECEMBER 2021
www.ti.com
36
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Copyright © 2021 Texas Instruments Incorporated
Product Folder Links: DAC7750 DAC8750



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