DAC8742HEVM Hardware Overview
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10
SLAU700A – June 2017 – Revised November 2017
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Copyright © 2017, Texas Instruments Incorporated
DAC8742H Evaluation Module
4.7
HART/PAFF Shunt Selection
The DAC8742HEVM includes various options in allowing the user to connect to an external filter or
external reference. Additionally, these external options can be bypassed as the DAC8742H device
includes an internal HART/PAFF filter, as well as an internal reference. The following configurations
display the jumper configurations required for external filter use or internal filter operation.
4.7.1
Internal Mode
Table 11
lists the internal mode shunt selection.
Table 11. Internal Mode Shunt Selection
Jumper
Position
Description
JP8
CLOSED/HART
HART: Connects to 0.022-µF load capacitor
OPEN/PAFF
JP9
(1 – 2) HART/PAFF
Connects MODINF to MOD_IN terminal block
J7
JP10
(1 – 2) PAFF
HART: Connects to 2200 pF
(2 – 3) HART
PAFF: Connects to 2700 pF
JP11
(1 – 2) HART
HART: Connects to 2200 pF
(2 – 3) PAFF
PAFF: Connects to 2700 pF
JP12
(1 – 2) HART/PAFF
Connects MODINF to MOD_IN terminal block
J7
JP16
(5 – 6) HART
HART: Connects to 680 pF
(7 – 8) PAFF
PAFF: Connects to 120 pF
4.7.2
External Mode With Internal REF
Table 12
lists the external filter mode with internal REF shunt selection.
Table 12. External Filter Mode With Internal REF Shunt Selection
Jumper
Position
Description
JP8
CLOSED/HART
HART: Connects to 0.022-µF load
capacitor
OPEN/PAFF
JP9
(1 – 2) HART
Connects MODINF to MOD_IN terminal
block J7
(2 – 3) PAFF
JP12
(1 – 2) HART
Connects MODINF to MOD_IN terminal
block J7
(2 – 3) PAFF
JP16
(3 – 4) HART
HART: Connects to 150-k filter network
(1 – 2) PAFF
PAFF: Connects to 27-k filter network
