Linear Technology DC890B, Quick Start Manual, Page: 1 / 13

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 890B
FastDAACS
1
DC890B QuickStart Guide
DESCRIPTION
Demonstration circuit DC890B along with QuickEval-
II
™ software 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 6±0.5VDC
power supply when operating in LVDS mode. When
operating in CMOS mode, the external power supply is
optional. The Linear Technology supplied QuickEval-
II 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. The QuickEval-II system provides
for fast and easy performance evaluation of high speed
ADCs. FastDAACS collects up to 256K word samples
and then performs various analyses on the data includ-
ing 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 modi-
fied frequency domain data is plotted to a display win-
dow 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.
Figure 1. DC890B FastDAACS Board
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