Clocking - Texas Instruments ADS1263EVM-PDK User Manual

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3.3 Clocking

Figure 3-11 shows the different clocking options for the ADS1263EVM. The default configuration connects a 0-Ω
resistor (R44) between the ADS1263 CLKIN pin and ground. Shorting CLKIN to ground automatically chooses
the ADS1263 internal 7.3728-MHz oscillator to be the ADC clock source.
0.1uF
Figure 3-11. ADS1263EVM External Voltage Reference Circuit (Optional)
An external clock can also be provided to the ADC.
First, an external 7.3728-MHz oscillator can be installed by using component Y1. The supply voltage for the
recommended clocking component can be a maximum of 3.3 V and is tied to DVDD as a result. Review the data
sheet parameters for any alternate components to confirm operation with these settings. See
selected clock requires a different DVDD voltage. In all cases, using an external clock at Y1 requires installing a
0-Ω resistor at R31 and removing R44.
The ADS1263EVM also offers the option of connecting an external clock using SMA connector J7. Choosing this
clock option also requires installing a 0-Ω resistor at R37 and removing R44. However, neither of these external
clock options are installed by default.
SBAU206B – APRIL 2015 – REVISED MAY 2023
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DVDD
Y1
4
VDD OUT
DNP
C25
DNP 1
STANDBY GND
ASEMB-7.3728MHZ-XY-T
GND
Clock has a VDD max of
3.3V --> disconnect DVDD
shunt to apply
J7
1
DNP
EXT Clock
GND
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R31 0
3
DNP
2
GND
GND
R37 0
DNP
Figure 3-11 shows multiple ways to apply an external clock.
Analog Interface
CLKIN
R44
0
Section 5 if the
ADS1263EVM-PDK Evaluation Module 15