Linear Technology DC890B - USB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS) DC890B DC890B Ficha De Dados

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dc890bf

DEMO MANUAL DC890B

DC890B QuickStart Guide 

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.

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 

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.