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DESCRIPTION
Demonstration circuit DC890B along with PScope™ soft-
ware provides a USB based Windows PC hosted digital
data acquisition system supporting CMOS/LVDS output
ADCs up to 250Msps. The DC890B must be powered from
an external 6VDC ±0.5VDC power supply when operat-
ing in LVDS mode. When operating in CMOS mode, the
external power supply is optional. The Linear Technology
supplied PScope evaluation software automatically detects
the DC890B and can also detect many of the standard
ADC demonstration circuits boards. The DC890B will
not enable LVDS mode unless an external 6.0VDC power
source is available. This system provides for fast and easy
performance evaluation of high speed ADCs. DC890B
collects up to 256K word samples and then performs
BOARD PHOTO
DEMO MANUAL DC890B
DC890B QuickStart Guide
various analyses on the data including calculating SNR,
SINAD, THD, SFDR and ENOB. The digitized input, an FFT
of the collected data, the primitive wave of the sample set
or an IFFT of modified frequency domain data is plotted to
a display window to facilitate analyzing distortion products
and sources. Figure 1 shows a picture of the DC890B. The
DC890B is connected to the ADC demonstration circuit via
a 100-pin edge connector, to the PC by a USB A-B cable and
to an optional power supply either by a 5mm power plug
or optionally by turrets. Figure 2 details the connections.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Figure 1. DC890B Board
dc890bf
1
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Summary of Contents for Linear Technology DC890B
- Page 1 ADCs. DC890B L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope collects up to 256K word samples and then performs is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Page 2: Schematic Diagram
DEMO MANUAL DC890B SCHEMATIC DIAGRAM dc890bf... - Page 3 DEMO MANUAL DC890B SCHEMATIC DIAGRAM dc890bf...
- Page 4 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 5 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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