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DESCRIPTION
The
LTC
2378-20, LTC2377-20
®
low power, low noise SAR ADCs with serial outputs that
operate 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 missing codes at 20
bits. The DC1925A demonstrates the DC and AC perfor-
mance of the LTC2378-20 in conjunction with the DC590
QuikEval™ and DC890 PScope™ data collection boards.
Use the DC590 to demonstrate DC performance such as
BOARD PHOTO
LTC2378-20/LTC2377-20/LTC2376-20
20-Bit,1Msps/500ksps/250ksps, Low
Power, SAR ADCs with 104dB SNR
and
LTC2376-20
are 20-bit,
Figure 1. DC1925A Connection Diagram
DEMO MANUAL DC1925A
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
demonstration circuit 1925A is intended to show recom-
mended 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 or scan the QR code on
the back of the board.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval and PScope are trademarks of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
dc1925af
1
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Related Manuals for Linear Technology LTC2377-20
Summary of Contents for Linear Technology LTC2377-20
- Page 1 LTC2378-20 in conjunction with the DC590 L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and QuikEval™ and DC890 PScope™ data collection boards. QuikEval and PScope are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Page 2: Assembly Options
DEMO MANUAL DC1925A ASSEMBLY OPTIONS Table 1. DC1925A Assembly Options ASSEMBLY VERSION U1 PART NUMBER MAX CONVERSION RATE NUMBER OF BITS MAX CLK IN FREQUENCY DC1925A-A LTC2378CMS-20 1Msps 80MHz DC1925A-B LTC2377CMS-20 500ksps 40MHz DC1925A-C LTC2376CMS-20 250ksps 20MHz DC890 QUICK START PROCEDURE DC890 QUICK START PROCEDURE Check to make sure that all switches and jumpers are Run the PScope software (PScope.exe version K73 or... - Page 3 DEMO MANUAL DC1925A DC1925A SETUP DC Power Reference The DC1925A requires ±9VDC and draws approximately The default reference is a LTC6655 5V reference. If an 100mA. Most of the supply current is consumed by the external reference is used it must settle quickly in the CPLD, op amps, regulators and discrete logic on the board.
- Page 4 DEMO MANUAL DC1925A DC1925A SETUP Figure 3. Single-Ended-to-Differential Driver There are a number of scenarios that can produce mislead- Data Collection ing results when evaluating an ADC. One that is common For SINAD, THD or SNR testing a low noise, low distortion is feeding the converter with a frequency, that is a sub- differential output sine generator such as the Stanford multiple of the sample rate, and which will only exercise...
- Page 5 DEMO MANUAL DC1925A DC1925A SETUP input traces with ground to minimize coupling from other low values to minimize noise and distortion. Metal film traces. Keep traces as short as possible. resistors are recommended to reduce distortion caused by self heating. Because of their low voltage coefficients, Component Selection to further reduce distortion NPO or silver mica capacitors should be used.
- Page 6 DEMO MANUAL DC1925A DC1925A SETUP Figure 6. QuikEval Screen Shot dc1925af...
- Page 7 DEMO MANUAL DC1925A DC1925A JUMPERS Definitions JP5 – V– Selects –3.6V or ground for V–. The default set- ting is –3.6V. Setting V– to ground is useful for evaluating JP1 – EEPROM is for factory use only. Leave this in the single supply operation of the buffer when operating the default WP position.
- Page 8 DEMO MANUAL DC1925A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC1925A General BOM C1-C5, C7, C10, C11, C13-C16, C56 CAP., X7R, 0.1µF, 16V 10% 0603 AVX, 0603YC104KAT2A C6, C9, C18, C24, C26, C29, C59, C60, C62, C69 CAP., X5R, 10µF, 6.3V 20% 0603 AVX, 06036D106MAT2A CAP., X7R, 1µF, 16V 10% 0603 AVX, 0603YC105KAT2A...
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Page 9: Parts List
DEMO MANUAL DC1925A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER RES., CHIP, 2.8k, 1/10W, 1% 0603 YAGEO, RC0603FR-072K8L R28, R80 RES., CHIP, 2k, 1/10W, 1% 0603 YAGEO, RC0603FR-072KL R30, R37, R39, R41, R44, R46, R50, R52, R53, RES., CHIP, 0Ω, 1/10W, 0603 YAGEO, RC0603JR-070RL R33, R34, R86, R87 RES., CHIP, 499Ω, 1/10W, 1% 0603... - Page 10 DEMO MANUAL DC1925A SCHEMATIC DIAGRAM dc1925af...
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Page 11: Schematic Diagram
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 12 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 13 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc. DC1925A-B DC1925A-A DC1925A-C...
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