Linear Technology DC1805A Series Manual

Driving 18-bit sar adc

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Description
The LTC
6362 is a low power, low noise differential op
®
amp with rail-to-rail input and output swing that has been
optimized to drive low power SAR ADCs. The amplifier
may be configured to buffer a fully differential input signal
or convert a single-ended input signal to a differential
output signal.
The LTC2380/LTC2379/LTC2378/LTC2377/LTC2376 are low
power, low noise ADCs with serial outputs that can operate
from a single 2.5V supply. The DC1805A demonstrates
the DC and AC performance of the LTC6362 driving the
LTC2379-18 when used in conjunction with the DC590B
QuikEval™ and DC718 fast DACs data collection boards.
DEMO MANUAL DC1805A
Use the DC590B to demonstrate DC performance such
as peak-to-peak noise and DC linearity. Use the DC718
if precise sampling rates are required or to demonstrate
AC performance such as SNR, THD, SINAD and SFDR.
The DC1805A is intended to demonstrate recommended
grounding, component placement and selection, routing
and bypassing for LTC6362 and the ADC.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
Figure 1. DC1805A Connection Diagram
Driving 18-Bit SAR ADC
LTC6362
dc1805af
1

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Summary of Contents for Linear Technology DC1805A Series

  • Page 1 DC and AC performance of the LTC6362 driving the 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 LTC2379-18 when used in conjunction with the DC590B the property of their respective owners.
  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1805A Description Table 1. DC1805A Assembly Options ASSEMBLY VERSION PART NUMBER MAX CONVERSION RATE NUMBER OF BITS MAX CLK IN FREQUENCY DC1805A-A LTC2380CMS-16 2Msps 100MHz DC1805A-B LTC2378CMS-16 1Msps 50MHz DC1805A-C LTC2377CMS-16 500ksps 25MHz DC1805A-D LTC2376CMS-16 250ksps 12.5MHz DC1805A-E LTC2379CMS-18 1.6Msps 99.2MHz...
  • Page 3 DEMO MANUAL DC1805A Quick start proceDure This board is tested by measuring the distortion at the 3) Apply the clock signal to connector J1. Clock frequency differential output given a –1dBFS, 2kHz single-ended 99.2MHz (to achieve 1.6Msps conversion rate, please input as shown in Figure 2.
  • Page 4: Analog Input

    DEMO MANUAL DC1805A Dc1805a setup DC Power Reference The DC1805A requires 9VDC and draws less than 70mA. The default reference is a LTC6655 5V reference. An external Most of the supply current is consumed by the CPLD, reference can be used by removing (U3) and populating regulators and discrete logic on the board.
  • Page 5 DEMO MANUAL DC1805A Dc1805a setup Jumpers JP4 – Ties the WP pin to V or GND. WP is the hardware write-protect pin. If tied to V , hardware write protection JP1 – Sets the DC bias for V of the LTC6362 to be is enabled.
  • Page 6: Parts List

    IC., Tinylogic UHS Inverter, SC70-5 Fairchild, NC7SZ04P5X U2, U5 IC., Tinylogic ULP-A Unbuffered Inverter, SC70-5 Fairchild, NC7SVU04P5X IC., LTC6655CHMS8-5, MS8 Linear Technology, LTC6655CHMS8-5#PBF IC., Single D Flip Flop, US8 ON Semiconductor, NL17SZ74 (USG) IC., Single SPST Bus Switch, SC70-5 Fairchild, NC7SZ66P5X IC., LTC6362CMS8, MS8 Linear Technology, LTC6362CMS8 IC., Serial EEPROM, TSSOP...
  • Page 7 DEMO MANUAL DC1805A parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER IC., LT1763CS8-1.8, SO8 Linear Technology, LT1763CS8-1.8#PBF IC., LT1763CS8, SO8 Linear Technology, LT1763CS8#PBF IC., MAX II Family, TQFP100 Altera, EPM240GT100C5N IC., LT1763CS8-2.5, SO8 Linear Technology, LT1763CS8-2.5#PBF IC., LT1763CS8-5, SO8...
  • Page 8 DEMO MANUAL DC1805A schematic Diagram dc1805af...
  • Page 9: 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 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. DC1805A-G DC1805A-A DC1805A-B DC1805A-H DC1805A-F DC1805A-C DC1805A-E DC1805A-D...

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