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dc2326af

DEMO MANUAL DC2326A

Description

LTC2345

16-/18-Bit, Octal 200ksps, SAR ADC

Demonstrationcircuit2326Ashowstheproperwaytodrive

theLTC®2345ADC.TheLTC2345isalownoise,highspeed,

simultaneoussampling16-/18-bitsuccessiveapproximation

interface that allows conversion-by-conversion control of

the input voltage span on a per-channel basis. An internal

2.048V reference and 2× buffer simplify basic operation

while an external reference can be used to increase the

input range and the SNR of the ADC.

The DC2326A demonstrates the DC and AC performance of

the LTC2345 in conjunction with the DC590/DC2026 and

DC890 data collection boards. Use the DC590/DC2026 to

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope,

QuikEval and SoftSpan are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

assembly options

boarD photo

demonstrate DC performance such as peak-to-peak noise

and DC linearity. Use the DC890 if precise sampling rates

are required or to demonstrate AC performance such as

SNR, THD, SINAD and SFDR. The DC2326A is intended

to demonstrate recommended grounding, component

placement and selection, routing and bypassing for this

ADC. A suggested driver circuit for the analog inputs is

also presented.

Designfilesforthiscircuitboardincludingtheschematic,

layout and BOM are available at

http://www.linear.com/demo/DC2326A

Figure 1. DC2326A Connection Diagram

Assembly

Version

U1 Part Number

Max Conversion

Rate

Number of

Channels

Number of

Bits

Max CLK IN

Frequency

CLK IN/fs

Ratio

DC2326A-A

LTC2345-18

200ksps

8

18

60MHz

300

DC2326A-B

LTC2345-16

200ksps

8

16

60MHz

300

–9V

0V to 4.096V

0V to 4.096V

CLK

100MHz MAX

+9V

DC890

DC590 OR DC2026

GND