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DAC7760IPWPR Datasheet(PDF) 44 Page - Texas Instruments

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Part # DAC7760IPWPR
Description  Single-Channel, 12- and 16-Bit Programmable Current Output and Voltage Output Digital-to-Analog Converters for 4-mA to 20-mA Current Loop Applications
PDF  63 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DAC7760IPWPR Datasheet(HTML) 44 Page - Texas Instruments

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12-/16-BitBa_
DACBa_
RSET
R2
T1
A1
+
T2
A2
R3
í
í
12.5 k
HART FSK Input
C1
C2
CAP2
CAP1
AVDD
GND
IOUT
BOOST
DACx760
IOUT
+VSENSE
GND
±VSENSE
VOUT
+
±
Copyright © 2016, Texas Instruments Incorporated
44
DAC7760, DAC8760
SBAS528B – JUNE 2013 – REVISED JUNE 2016
www.ti.com
Product Folder Links: DAC7760 DAC8760
Submit Documentation Feedback
Copyright © 2013–2016, Texas Instruments Incorporated
Application Information (continued)
Figure 92. VOUT and IOUT Tied Together to One Terminal
The buffer amplifier prevents leakage through the internal 60-kΩ resistor in current output mode and does not
allow it to be seen as a parallel load. The VOUT pin is in high impedance mode in this case and allows minimal
leakage current. Note that the offset of the external amplifier adds to the overall VOUT offset error and any
potential phase shift from the external amplifier can cause VOUT stability issues.
9.1.2 Implementing HART in All Current Output Modes
If it is desirable to implement HART irrespective of the RANGE bit settings, there are two ways to do this.
9.1.2.1 Using CAP2 Pin on VQFN Package
The first method of implementing HART is to couple the signal through the CAP2 pin, as conceptualized in
Figure 93. Note that this pin is only available in the 40-pin VQFN package.
Figure 93. Implementing HART on IOUT Using the CAP2 Pin
In Figure 93, R3 is nominally 40 Ω, and R2 is dependent on the current output range (set by the RANGE bits) as
described below:
•
4-mA to 20-mA range: R2 = 2.4 kΩ typical
•
0-mA to 20-mA range: R2 = 3 kΩ typical
•
0-mA to 24-mA range: R2 = 3.6 kΩ typical
The purpose of the 12.5-kΩ resistor is to create a filter when CAP1 and CAP2 are used.



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