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Description
Demonstration circuit 2326A shows the proper way to drive
®
the
LTC
2345
ADC. The LTC2345 is a low noise, high speed,
simultaneous sampling 16-/18-bit successive approximation
register (SAR) ADC. The LTC2345 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 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
assembly options
Assembly
Version
U1 Part Number
DC2326A-A
LTC2345-18
DC2326A-B
LTC2345-16
boarD photo
0V to 4.096V
0V to 4.096V
16-/18-Bit, Octal 200ksps, SAR ADC
Max Conversion
Rate
200ksps
200ksps
–9V
GND
+9V
V
IN2
V
IN1
Figure 1. DC2326A Connection Diagram
DEMO MANUAL DC2326A
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.
Design files for this circuit board including the schematic,
layout and BOM are available at
http://www.linear.com/demo/DC2326A
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.
Number of
Number of
Channels
Bits
8
18
8
16
DC590 OR DC2026
CLK
100MHz MAX
2.5V
P-P
LTC2345
Max CLK IN
CLK IN/fs
Frequency
Ratio
60MHz
300
60MHz
300
DC890
dc2326af
1
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Related Manuals for Linear LTC2345
Summary of Contents for Linear LTC2345
- Page 1 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.
- Page 2 (Pscope.exe version K82 or ™ settings as described in the DC2326A Jumpers section of later) which can be downloaded from www.linear.com/ this manual. The default connections configure the ADC to designtools/software. use the onboard reference and regulators to generate all Complete software documentation is available from the the required bias voltages.
- Page 3 DEMO MANUAL DC2326A Dc2326a setup 0.1µF U25B R107 LT6237IDD R108 1000pF 49.9 – C104 C100 0.1µF R113 R119 R124 U25A R123 LT6237IDD 49.9 – – C112 C102 1000pF R129 C116 dc2326 F02 Figure 2. 0V–4.096V Single-Ended to Fully Differential DC Coupled Driver DC Power conversion rate is shown in the Assembly Options table.
- Page 4 DEMO MANUAL DC2326A Dc2326a setup Reference To change the default settings for the LTC2345 in PScope, click on the Set Demo Bd Options button in the PScope The default reference is the LTC2345 internal 4.096V tool bar shown in Figure 4. This will open the Configure reference.
- Page 5 ADC. Here are some things to remember when laying recommended to reduce distortion caused by self heat- out a board for the LTC2345. A ground plane is necessary ing. Because of their low voltage coefficients, to further to obtain maximum performance. Keep bypass capacitors reduce distortion NPO or silver mica capacitors should be as close to supply pins as possible.
- Page 6 DEMO MANUAL DC2326A Dc2326a setup Figure 3. PScope Screen Shot Figure 4. PScope Tool Bar dc2326af...
- Page 7 DEMO MANUAL DC2326A Dc2326a setup Figure 5. PScope Configuration Menu dc2326af...
- Page 8 DEMO MANUAL DC2326A Dc2326a setup Figure 6. QuikEval Screen Shot Figure 7. QuikEval Configuration Menu dc2326af...
- 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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