Figure 4-27. Adc Switch Routing; Table 4-18. Adc Mux Select Logic; Table 4-19. Vref Switch; Table 4-20. Dac Vref Switch - Texas Instruments AM263 Series User Manual

Hardware Description
There are two muxes (TMUX1136DQAR) that determine the pathing of ADC signals to and from the HSEC
Connector.
MUX Select Signal
ADC1_MUX_SEL
ADC2_MUX_SEL
There are three switches that are used to configure the reference voltages for the ADC and DAC.
• The VREF Switch (SW8) is a single pole double throw switch that controls which 1.8 V reference will be used
for ADC and DAC.
VREF Switch Position
Pin 1-2
Pin 2-3
• The DAC VREF Switch (SW6) is a single pole double throw switch that controls the input for the DAC VREF
inputs of the AM263x SoC.
DAC VREF Switch Position
Pin 1-2
Pin 2-3
38 AM263x Control Card Hardware User's Guide

Table 4-18. ADC MUX Select Logic

Condition
SEL Signal HIGH
SEL Signal LOW
SEL Signal HIGH
SEL Signal LOW

Figure 4-27. ADC Switch Routing

Table 4-19. VREF Switch

Table 4-20. DAC VREF Switch

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Function
S1A → D1
S2A → D2
S1B → D1
S2B → D2
S1A → D1
S2A → D2
S1B → D1
S2B → D2
Reference Selection
On board 1.8 V Reference (REF3318AIDBZT)
HSEC VREF
Reference Selection
AM263x on-die LDO
Output of VREF Switch
SPRUJ09C – MARCH 2022 – REVISED FEBRUARY 2023
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Description
HSEC_ADC0_AIN0 selected
HSEC_ADC0_AIN1 selected
HSEC_DAC_OUT selected
HSEC_DAC_OUT selected
HSEC_ADC4_AIN0 selected
HSEC_ADC4_AIN1 selected
ADC_CAL0 selected
ADC_CAL1 selected
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