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DC1925A-A

Description
board demo ltc2378-20
CategoryDevelopment board/suite/development tools   
File Size2MB,16 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC1925A-A Overview

board demo ltc2378-20

DEMO MANUAL DC2135A
LTC2378-20
2ppm Linearity,
DC Accurate Driver
Description
Demonstration circuit 2135A shows a simple DC accurate
ADC driver circuit that converts a ±10V single-ended input
signal into a fully differential signal capable of driving the
LTC2378-20
with a combined linearity error of only 2ppm.
The LTC2378-20 is a low power, low noise 20-bit SAR
ADC with a serial output that operates from a single 2.5V
supply. The following text refers to the LTC2378-20 but
applies to all parts in the family, the only difference being
the maximum sample rate. The LTC2378-20 supports a ±5V
fully differential input range with a 104dB SNR, consumes
only 21mW and achieves ±2ppm INL max with no miss-
ing codes at 20 bits. The DC2135A is the PCB that goes
with DN1032. Refer to this design note for the theory of
operation for this demo circuit. An option for a pseudo-
differential input drive is provided. The DC2135A can be
used with either the DC890 or DC590 USB controllers.
Use the DC890 if precise sampling rates are required or to
demonstrate AC performance such as SNR, THD, SINAD
and SFDR. Use the DC590 to look at DC performance or
to generate histograms showing peak-to-peak noise. The
demonstration circuit 2135A also is intended to show
recommended grounding, component placement and
selection, routing and bypassing for this ADC.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2135A
An LTspice Simulation of the ADC Driver is available at
http://www.linear.com/LTC2378-20
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope
and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
–16V
GND
+16V
3.3V
P-P
64MHz MAX
CLK IN
TO DC890
±10V A
IN
TO DC590
Figure 1. DC2135A Connection Diagram
dc2135af
1

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