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DAC8760IPWPR.B Datasheet(PDF) 47 Page - Texas Instruments |
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DAC8760IPWPR.B Datasheet(HTML) 47 Page - Texas Instruments |
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47 / 69 page  DACx760 IOUT +VSENSE GND ±VSENSE VOUT + ± Copyright © 2016, Texas Instruments Incorporated Figure 9-2. VOUT and IOUT Tied Together to One Pin 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 9-3. Note that this pin is only available in the 40-pin VQFN package. + 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 Figure 9-3. Implementing HART on IOUT Using the CAP2 Pin In Figure 9-3, 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. To insert the external HART signal on the CAP2 pin, an external ac-coupling capacitor is typically connected to CAP2. The high-pass filter 3-dB frequency would be determined by the resistive impedance looking into CAP2 (R2 + 12.5 kΩ) and the coupling capacitor value. The 3-dB frequency would be 1 /(2 × π × [R2 + 12.5 kΩ] × [Coupling Cap Value]). www.ti.com DAC7760, DAC8760 SBAS528D – JUNE 2013 – REVISED DECEMBER 2021 Copyright © 2021 Texas Instruments Incorporated Submit Document Feedback 47 Product Folder Links: DAC7760 DAC8760 |
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