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Table 1. Square Post Jumpers
Jumper Default Description
Power Supply
JP12 1-2 Connects 3.3-V supply to analog 3.3-V supply of ADS540x
JP13 1-2 Connects 1.8-V supply to digital 1.8-V supply of ADS540x
JP14 1-2 Connects 1.8-V supply to analog 1.8-V supply of ADS540x
JP15 1-2 Connects 1.8-V supply to analog 1.8-V supply AVDDC of ADS540x
(Jumpers JP12, JP13, JP14, JP15 have a ground connection on post 3 allowing use of a 2-post external supply cable connected to
posts 2 and 3, if the different ADC supply domains are driven individually)
ADC Control Pins
SJP1 1-3 Position 1-3 connects trigger input to SMA J9
Position 2-3 connects trigger input to pushbutton switch SW2
Position 4-3 connects trigger input to Samtec connector for trigger from the capture card
JP1 1-2 Connects Enable pin to DVDD. ( Position 2-3 connects Enable to Gnd)
USB Port Power
JP5 1-2 IO Supply Selection (1-2 power from USB port) (2-3 power from EVM)
Surface mount 0-Ω resistor jumpers are described in Table 2. The four SPI lines to the ADC (SCLK, SEN,
SDATA, SDO) are, by default, driven by the USB port on the EVM under the control of the ADS540x SPI
GUI software. Alternatively, drive the SPI signals into the ADC by a field-programmable gate array (FPGA)
located on the capture card that connects to the Samtec connector, in which case four surface mount
resistors must be removed from their default positions and soldered in the alternate positions.
The ADS540x outputs a common mode voltage that may be used to bias the common mode level of the
analog signal. Since the ADS540x has a buffered analog input and the input signal is internally biased to
VCM if the signal is AC coupled, the VCM pin is, by default, unconnected. Install a 0-Ω jumper resistor to
connect the VCM to the analog input termination network.
Table 2. Surface Mount Jumpers
Jumper Default Description
R5 open Connects VCM to transformer termination mid-point for channel 1
R6 open Connects VCM to transformer termination mid-point for channel 2
R12 open Connects the optional trigger signal to the Samtec connector for trigger sourced from the capture card
FPGA
R18 open Connects SEN to TSW140x
R16 installed Connects SEN to USB port
R15 installed Connects SDATA to USB port
R38 open Connects SDATA to TSW140x
R14 installed Connects SCLK to USB port
R43 open Connects SCLK to TSW140x
R17 open Connects SDO to USB port
R45 open Connects SDO to TSW140x
Analog Input Channel Single Ended vs. Differential Option
R20 open Connects SMA Channel A + input to bypass input transformers
L1 0-Ω R Connects SMA Channel A + input to input transformers
R19 open Connects SMA Channel A - input to GND
L2 0-Ω R Connects SMA Channel A - input to bypass input transformers
R39 open Connects Channel A + input bypassing transformers
C14 1 µF Connects Channel A + input from transformers
R40 open Connects Channel A – input bypassing transformers
C15 1 µF Connects Channel A – input from transformers
R23 open Connects SMA Channel B + input to bypass input transformers
6
ADS540x and ADS54T0x Evaluation Module (EVM) SLAU450–July 2012
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