Driving the Clock and Inputs
5
SNAU212 – June 2017
Copyright © 2017, Texas Instruments Incorporated
ADC1xD1x00CVAL Board User’s Guide
3.2
Driving the Analog Inputs
The analog inputs may be driven AC-coupled and must be driven differentially. Depending upon the
application, an amplifier or balun board may be used to achieve single-ended to differential conversion.
4
Jumper Settings
Most of the jumper pins on the EVAL board are also available for customer use, and are more clearly
explained in the datasheet; some exceptions are the TEST pins as described below. These pins are
related to internal test functions and are not available.
The ADC may be used in either Extended Control Mode (ECM) or Non-ECM, also known as
pin-control
mode
; this is set by the ECEb pin. In ECM, the ADC modes and settings are written through the Serial
Port Interface. Some control pins remain active in ECM.
Table 3. Control Pins and Function
PIN (BOARD)
PIN (DATASHEET)
I/O
FUNCTION
TEST_LP
N/A
N/A
Internal test function; do not connect
ECEB
ECEb
Input
ECM and Non-ECM: Extended
Control Mode Enable bar select
TPN
TPM
Input
Non-ECM only: Test Pattern Mode
select
NDM
NDM
Input
ECM and Non-ECM: Non-Demux
Mode select
TEST_IO
N/A
N/A
Internal test function; do not connect
POR_EN
N/A
N/A
Internal test function; do not connect
D/-
D/-
Input
Differential DCLK Reset DES DES
Input Non-ECM only: DES Mode
select
LSPSM
LSPSM
Input
Low sampling power saving mode
DDR_PH
DDRPh
Input
Non-ECM only: DDR Phase select
FSR
FSR
Input
Non-ECM only: Full-Scale Range
select
PDQ
PDQ
Input
ECM and Non-ECM: Power-Down
Q-channel
PDI
PDI
Input
ECM and Non-ECM: Power-Down I-
channel
SCSB
SCSb
Input
SPI: Serial Chip Select bar
SDO
SDO
Output
SPI: Serial Data Out
SDI
SDI
Input
SPI: Serial Data In
SCLK
SCLK
Input
SPI: Serial Clock
TEST_RSV1
N/A
N/A
Internal test function; do not connect
TEST_RSV2
N/A
N/A
Internal test function; do not connect
TDIODE
/-
Output
Temperature Sensor Diode
terminals
CALRUN
CalRun
Output
Calibration Running indication
VBG
VBG
I/O
Bandgap Voltage Output / LVDS
Common-mode Voltage select
TEST_CF
N/A
N/A
Internal test function; do not connect
RCLK
RCLK+/-
Input
AutoSync: Reference Clock Input
RCOUT1
/-
Output
AutoSync: Reference Clock
Differential Output 1
RCOUT2
/-
Output
AutoSync: Reference Clock
Differential Output 2
In Non-ECM, the following control pins are available.
