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Linear Technology DC2581A Demo Manual
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Linear Technology DC2581A Demo Manual

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DESCRIPTION
Demonstration circuit 2581A shows the proper way to drive
the
LTC
2341
ADC. The LTC2341 is a low noise, high speed,
®
simultaneous sampling 16-/18-bit successive approximation
register (SAR) ADC. The LTC2341 has a flexible SoftSpan
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 DC2581A demonstrates the DC and AC performance of
the LTC2341 in conjunction with the DC590/DC2026 and
DC890 data collection boards. Use the DC590/DC2026 to
DEMO MANUAL DC2581A
16-/18-Bit, Dual 666ksps, SAR ADC
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 DC2581A is intended to
™
demonstrate recommended grounding, component place-
ment and selection, routing and bypassing for this ADC. A
suggested driver circuit for the analog inputs is also presented.
Design files for this circuit board including the schematic,
layout and BOM are available at
http://www.linear.com/demo/DC2581A
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.
Figure 1. DC2581A Connection Diagram
LTC2341
dc2581af
1

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Summary of Contents for Linear Technology DC2581A

  • Page 1 LTC2341 in conjunction with the DC590/DC2026 and L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PScope, DC890 data collection boards. Use the DC590/DC2026 to QuikEval and SoftSpan are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Assembly Options

    The analog inputs by default are Help menu. Updates can be downloaded from the Tools DC coupled. Connect the DC2581A to a DC890 USB High menu. Check for updates periodically as new features Speed Data Collection Board using connector P1. Then, may be added.
  • Page 3 Assembly Options table. If the clock input is to be driven with logic, it is recommended The DC2581A requires ±9VDC and draws +132mA/–52mA. that the 49.9Ω termination resistor (R4) be removed. Most of the supply current is consumed by the FPGA, op Driving R4 with discrete logic may result in slow rising amps, regulators and discrete logic on the board.
  • Page 4 There setting the REF jumper (JP1) to the EXT position and is also a button to return PScope to the default DC2581A installing a 0Ω resistor in the R7 position. This should...
  • Page 5 The area immediately surrounding the ADC on LTC2341, component selection is important so as to not the DC2581A should be used as a guideline for placement, degrade performance. Resistors should have low values and routing of the various components associated with to minimize noise and distortion.
  • Page 6 DEMO MANUAL DC2581A DC2581A SETUP Figure 3. PScope Screen Shot Figure 4. PScope Tool Bar dc2581af...
  • Page 7 DEMO MANUAL DC2581A DC2581A SETUP Figure 5. PScope Configuration Menu dc2581af...
  • Page 8 DEMO MANUAL DC2581A DC2581A SETUP Figure 6. QuikEval Screen Shot Figure 7. QuikEval Configuration Menu dc2581af...
  • Page 9 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 10 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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