Texas Instruments ADS7853EVM-PDK, Руководство пользователя, Страница: 9 / 41

www.ti.com
Digital Interface
3 Digital Interface
Socket strip connector J6 provides the digital I/O connections between the ADSxx53EVM board and the
simple capture card board.
Table 4 summarizes the pin-outs for connector J6.
Table 4. Connector J6 Pin Out
Pin Number Signal Description
J6.2, J6.10, J6.15, J6.16,
GND Ground connections
J6.18
J6.4 EVM PRESENT EVM present signal, active low
I
2
C bus; used only used to program the U7
J6.11, J6.12 I
2
C™ bus
EEPROM on the EVM board
3.3V digital supply from the simple capture card
J6.13 DVDD
controller board
J6.34 CS Chip select, active low
J6.36 SCLK Serial interface clock
J6.38 SDI Serial data input
J6.40 SDO_A Serial data output for channel A
J6.42 SDO_B Serial data output for channel B
3.1 Serial Interface (SPI)
The ADSxx53 digital output is available in SPI-compatible format, which makes interfacing with
microprocessors, digital signal processors (DSPs), and FPGAs easy. The ADSxx53EVM offers 47-
Ω
resistors between the SPI signals and connector J6 to aid with signal integrity. Typically, in high-speed
SPI communication, fast signal edges can cause overshoot; these 47-
Ω resistors slow down the signal
edges in order to minimize signal overshoot.
3.2 I
2
C Bus for Onboard EEPROM
The ADSxx53EVM has an I
2
C bus to communicate with the onboard EEPROM that records the board
name and assembly date. It is not used in any form by the ADSxx53 converter.
9 SBAU210A – June 2014 – Revised August 2014 ADS8353EVM-PDK and ADS7853EVM-PDK
Submit Documentation Feedback
Copyright © 2014, Texas Instruments Incorporated