ADC12D1000_15 Datasheet, PDF (48/86 Pages) Texas Instruments – GSPS Ultra High-Speed ADC

ADC12D1000, ADC12D1600
SNAS480N – MAY 2010 – REVISED AUGUST 2015
www.ti.com
Device Functional Modes (continued)
7.4.2 Demux/Non-Demux Mode
The ADC12D1x00 may be in one of two demultiplex modes: Demux Mode or Non-Demux Mode (also sometimes
referred to as 1:1 Demux Mode). In Non-Demux Mode, the data from the input is simply output at the sampling
rate on one 12-bit bus. In Demux Mode, the data from the input is output at half the sampling rate, on twice the
number of buses. Demux/Non-Demux Mode may only be selected by the NDM pin. In Non-DES Mode, the
output data from each channel may be demultiplexed by a factor of 1:2 (1:2 Demux Non-DES Mode) or not
demultiplexed (Non-Demux Non-DES Mode). In DES Mode, the output data from both channels interleaved may
be demultiplexed (1:4 Demux DES Mode) or not demultiplexed (Non-Demux DES Mode).
7.5 Programming
7.5.1 Control Modes
The ADC12D1x00 may be operated in one of two control modes: Non-extended Control Mode (Non-ECM) or
Extended Control Mode (ECM). In the simpler Non-ECM (also sometimes referred to as Pin Control Mode), the
user affects available configuration and control of the device through the control pins. The ECM provides
additional configuration and control options through a serial interface and a set of 16 registers, most of which are
available to the customer.
7.5.1.1 Non-Extended Control Mode
In Non-extended Control Mode (Non-ECM), the Serial Interface is not active and all available functions are
controlled through various pin settings. Non-ECM is selected by setting the ECE Pin to logic-high. For the control
pins, "logic-high" and "logic-low" refer to V_A and GND, respectively. Nine dedicated control pins provide a wide
range of control for the ADC12D1x00 and facilitate its operation. These control pins provide DES Mode selection,
Demux Mode selection, DDR Phase selection, execute Calibration, Calibration Delay setting, Power-down I-
channel, Power-down Q-channel, Test Pattern Mode selection, and Full-Scale Input Range selection. In addition
to this, two dual-purpose control pins provide for AC-DC-coupled Mode selection and LVDS output common-
mode voltage selection. See Table 5 for a summary.
Table 5. Non-ECM Pin Summary
PIN NAME
LOGIC-LOW
LOGIC-HIGH
DEDICATED CONTROL PINS
DES
Non-DES Mode
DES
Mode
NDM
Demux
Mode
Non-Demux Mode
DDRPh
0° Mode
90° Mode
CAL
See Calibration Pin (CAL)
CalDly
Shorter delay
Longer delay
PDI
I-channel active
Power Down
I-channel
PDQ
Q-channel active
Power Down
Q-channel
TPM
Non-Test Pattern Mode
Test Pattern Mode
FSR
Lower FS input Range
Higher FS input Range
DUAL-PURPOSE CONTROL PINS
V_CMO
V_BG
AC-coupled operation
Not allowed
Not allowed
Higher LVDS common-mode
voltage
FLOATING
Not valid
Not valid
Not valid
Not valid
Not valid
Power Down
I-channel
Power Down
Q-channel
Not valid
Not valid
DC-coupled operation
Lower LVDS common-mode
voltage
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