Electronic Component Distributor. Source::Texas Instruments
P.N:LM98640CVAL Desc:EVAL BOARD FOR LM98640
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1.0 Introduction
The LM98640CVAL Board is designed to allow
quick evaluation and design development of
National Semiconductor’s LM98640QML
Analog Front End. This development board is
designed to function in several different
configurations.
The primary configuration connects the
LM98640QML evaluation board to National
Semiconductor’s Wavevision 5 Data Capture
Board (WV5). The AFEval software is used to
communicate to the LM98640QML’s SPI port as
well as retrieve Data Output from the device for
display or external analysis. The present
revision of the WV5 board is limited to 30k
samples per channel. Future revisions will
allow for very deep memory capture (up to 8MB
total).
The LM98640QML evaluation board also
comes with an auxiliary adapter card. This card
allows the LM98640QML output to be routed to
one of three connectors for external data
capture and analysis. To facilitate this
configuration, a Total Phase Aardvark I2C/SPI
Host Adapter is supplied to perform the SPI
communication using the AFEval tool.
A PCB footprint for and external clock oscillator
is provided on board to allow testing without the
need of an external clock source. An SMA
connection is available for connecting an
external clock source when a variable
frequency may be desired.
The power supply for the LM98640QML and
surrounding circuitry can be made through the
WV5 board or from external bench top supplies
when the WV5 board is not being implemented.
The CCD signal inputs are made via SMD type
connections. The signals can be routed directly
to the AFE, AC coupled, emitter follower
buffered, or sent into a video multiplexer to
create a CCD type signal from a non CCD
source.
2.0 Board Assembly
The LM98640CVAL Evaluation Board comes
pre-assembled. Refer to the Bill of Materials in
Section 6
for a description of components, to
Figure 1
for major component placement and to
Section 4
for the Evaluation Board schematic.
The Evaluation Board comes as a single board
with two distinct partitions. The Evaluation
partition is on the right side, and the Adapter
Card is on the left. The two partitions should be
carefully separated to connect the AFE data
output to the desired Adapter Card connector.
Figure 1. Evaluation Board Layout
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