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DESCRIPTION
Demonstration circuit 2520A shows the proper way to drive
®
the
LTC
2344
ADC. The LTC2344 is a low noise, high speed,
simultaneous sampling 16-/18-bit successive approximation
register (SAR) ADC. The LTC2344 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 DC2520A demonstrates the DC and AC performance of
the LTC2344 in conjunction with the DC590/DC2026 and
DC890 data collection boards. Use the DC590/DC2026 to
BOARD PHOTO
V
IN2
0V to 4.096V
V
IN1
0V to 4.096V
16-/18-Bit, Octal 400ksps, SAR ADC
–9V
GND
+9V
Figure 1. DC2520A Connection Diagram
DEMO MANUAL DC2520A
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 DC2520A 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/DC2520A
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.
DC590 OR DC2026
CLK
100MHz MAX
2.5V
P-P
LTC2344
DC890
dc2520af
1
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Related Manuals for Linear Technology DC2520A
Summary of Contents for Linear Technology DC2520A
- Page 1 LTC2344 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 DC2520A 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 DC2520A 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, Driving R4 with discrete logic may result in slow rising opamps, 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 DC2520A installing a 0Ω resistor in the R7 position. This should...
- Page 5 The area immediately surrounding the ADC on LTC2344, component selection is important so as to not the DC2520A 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 DC2520A DC2520A SETUP Figure 3. PScope Screen Shot Figure 4. PScope Tool Bar dc2520af...
- Page 7 DEMO MANUAL DC2520A DC2520A SETUP Figure 5. PScope Configuration Menu dc2520af...
- Page 8 DEMO MANUAL DC2520A DC2520A SETUP Figure 6. QuikEval Screen Shot Figure 7. QuikEval Configuration Menu dc2520af...
- 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.
- Page 11 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC2520A-B DC2520A-A...
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