Table of Contents
Advertisement
www.ti.com
4
Digital Interface
Connector J19 (Samtec part number ERF8-025-01-L-D-RZ-L-TR socket strip connector) provides the
digital I/O connections between the ADS86xxEVM board and the simple capture card. Consult Samtec at
www.samtec.com
the pin outs for connector J19.
Pin Number
J19.1
J19.4
J19.5
J19.6
J19.8
J19.11
J19.12
J19.13
J19.14
J19.33, J19.34
J19.35
J19.38
J19.39
J19.45-49
J19.2, J19.10, J19.16, J19.50
4.1
Serial Interface (SPI)
The ADS86xx device uses SPI serial communication in mode 1 (CPOL = 0, CPHA = 1) with clock speeds
up to 18 MHz. The ADS86xxEVM offers 49.9-Ω resistors between the SPI signals and J19 to aid with
signal integrity. Typically, in high-speed SPI communication, fast signal edges can cause overshoot; these
49.9-Ω resistors slow down the signal edges in order to minimize signal overshoot.
2
4.2
I
C Bus for the Onboard EEPROM
The ADS86xxEVM has an I
the onboard EEPROM. The bus is not used in any form by the ADS86xx converter.
4.3
microSD Card
The ADS86xxEVM has a microSD card that contains the software files for the simple capture card. The
contents of the microSD card must not be deleted or altered.
SBAU245A – June 2015 – Revised July 2015
Submit Documentation Feedback
or call 1-800-SAMTEC-9 for a variety of mating connector options.
Table 9. Connector J19 Pin Out
Signal
DAISY
EVM_PRESENT
REFSEL
RST/PD
A
EVM_ID_SDA
EVM_ID_SCL
3V3_SDCC
5V_SDCC
SCLK
CS
SDI
SDO
EVMSDxxxxx
GND
2
C bus that records the board name and assembly date to communicate with
Copyright © 2015, Texas Instruments Incorporated
Description
Daisy input for the ADC
EVM present, active low (connected to GND)
Reference selection input for the ADC
Reset or power-down input for the ADC
No connection
2
I
C data for the onboard EEPROM
2
I
C clock for the onboard EEPROM
3.3-V digital supply from the simple capture card
Unregulated 5-V supply from the simple capture card
Clock input for the ADC
Chip-select input for the ADC
Data input for the ADC
Data output from the ADC
Digital connections for the onboard micro secure digital
(microSD) card
Ground connections
ADS86xxEVM-PDK Evaluation Module
Digital Interface
Table 9
summarizes
9
Advertisement
Table of Contents
