Texas Instruments ADC31JB68, User Manual, Page: 14 / 20

14 SLAU630A – August 2015 – Revised August 2016
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Jumper, Connector, and LED Descriptions
Appendix A
SLAU630A – August 2015 – Revised August 2016
Jumper, Connector, and LED Descriptions
A.1 Jumper Descriptions
The EVM jumpers are shown in Table 7 as well as the default settings for the jumpers. Use this table to
reset the EVM in the default configuration, in case of issues.
Table 7. Jumper Descriptions and Default Settings
Jumper Description Default Setting
JP8 LMK SPI bus level translator chip disable
OPEN: enabled
SHORTED: disabled OPEN
JP10 ADC SPI bus level translator ADC-side logic level
SHORT 1–2: 1.8-V logic
SHORT 2–3: 3.3/3.0-V logic SHORT 2–3
JP11 ADC SPI bus-level translator chip disable
OPEN: enabled
SHORTED: disabled OPEN
SW3 LMK_SYNC push-button. Can be used to initiate the LMK04828 device SYNC function.
SW2 LMK_RESET push-button. Can be used to reset the LMK04828 device.
SW1 SYSREF_SW push-button. Can be used to generate a SYSREF signal edge at the ADC’s
SYSREF input. (Components on EVM are not fully populated for this function by default)
A.2 Connector Descriptions
The EVM connectors and their function are described in Table 8 .
Table 8. Connector Descriptions
Connector Description
FMC FMC connector that connects to data capture card
J6 (+5V IN) +5-V power connector
USB USB interface connector for device configuration
VIN+ VIN+ analog input to ADC via transformer network. Grounded by default.
VIN– VIN– analog input to ADC via transformer network
CLK Sampling clock input for ADC via transformer network
SYSREF SYSREF input for ADC via transformer network
REFCLK Optional reference output from LMK04828
EXTREF Optional reference input to LMK04828 CLKin1 or OSCin inputs.