DDC101U Datasheet, PDF (26/29 Pages) Texas Instruments – 20-BIT ANALOG-TO-DIGITAL CONVERTER

DATA
INPUT
DDC101
DATA
DATA
OUTPUT INPUT
DDC101
DATA
DATA
OUTPUT INPUT
DDC101
DATA
OUTPUT
DATA
TRANSMIT
In
DATA
TRANSMIT
In
DATA
TRANSMIT
In
FIGURE 26. Daisy Chained DDC101s.
DATA
INPUT
DDC101
DATA OUTPUT
DATA TRANSMIT In
DATA
INPUT
DDC101
DATA OUTPUT
DATA TRANSMIT In
Data Output
DATA
INPUT
DDC101
DATA OUTPUT
DATA TRANSMIT In
FIGURE 27. DDC101 Parallel Operation.
MULTIPLE DDC101 OPERATION
Multiple DDC101 units can be connected in serial or parallel
configuration as illustrated in Figures 26 and 27.
DATA OUTPUT can be used with DATA INPUT to “daisy
chain” the output of several DDC101 units together to
minimize wiring; in this mode of operation, the serial data
output is shifted through multiple DDC101s (Figure 26).
DATA OUTPUT is in a high impedance state until DATA
TRANSMIT In is active. In this way, several DDC101 units
can be connected in parallel to be enabled by the DATA
TRANSMIT In line (Figure 27).
DDC101 EVALUATION FIXTURE
The DEM-DDC101P-C Evaluation Fixture is highly recom-
mended for initial evaluation of the DDC101. It is designed
for ease of use. The only additional equipment required to do
Enable
a complete evaluation of the performance of the DDC101 is
an IBM compatible PC with EGA or VGA graphics, a
parallel interface port, a laser printer (optional), a ±5VDC
power supply, and a signal source.
The DEM-DDC101P-C software is mouse compatible and
retrieves data from up to 32 DDC101s in an easy to read,
graphical format on the screen. The DEM-DDC101P-C
Evaluation Fixture includes a PC Interface Board (with
necessary parts), a DDC101 Board, a 25-pin ribbon connec-
tor and a 34-pin ribbon connector. The PC Interface Board
makes timing commands and access to and from the DDC101
test board possible through the provided PC software. Data
sheet, LI-439, provides complete information describing the
evaluation fixture.
®
DDC101
26