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Description
Demonstration circuit 1485A features the
18-bit SoftSpan™ I
device features six programmable output ranges: 0V to 5V,
0V to 10V, ± 5V, ±10V, ±2.5V and –2.5V to 7.5V. The demo
circuit allows all of the LTC2757's features to be exercised,
including system-level gain and offset adjustments.
Arrow.com.
Downloaded from
LTC
®
DAC with ±1LSB maximum INL. This
OUT
RIBBON CABLE
TO DC590
CONTROLLER
DEMO MANUAL DC1485A
2757A
single
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
SoftSpan and QuikEval are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
ANALOG POWER SUPPLY
(NORMALLY ±15V)
Figure 1. Connection Diagram
LTC2757
18-Bit, Parallel Input,
SoftSpan I
OUT
DAC
CONNECTIONS
DAC
dc1485afa
1
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Table of Contents
Related Manuals for Linear Technology DC1485A
Summary of Contents for Linear Technology DC1485A
- Page 1 0V to 5V, L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and 0V to 10V, ± 5V, ±10V, ±2.5V and –2.5V to 7.5V. The demo SoftSpan and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
-
Page 2: Quick Start Procedure
A square wave option Connect a clean ±15V power supply to the turret posts at the bottom of the DC1485A board. Connect J1 to a DC590 is available to test settling time. MSPAN jumper should be USB serial controller using the supplied 14-conductor rib- in the lower position if software span control is desired. -
Page 3: Using The Parallel Connector
D_/S: Data/Span Select: This pin is used to select acti- vation of the data or span I/O pins (D0 to D17 or S0 to The DC1485A can be used without the DC590 QuikEval S2, respectively), along with their respective dedicated system. -
Page 4: Hardware Setup
DEMO MANUAL DC1485A harDware setup Jumpers Analog Connections (Turret Posts) MSPAN: Manual Span Control Pin. MSPAN is used to : DAC Voltage Output. configure the LTC2757 for operation in a single, fixed : DAC Reference Voltage. If the onboard LT1236 refer- output range. -
Page 5: Parts List
DEMO MANUAL DC1485A parts list ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER KIT QTY NUMBER OF BOARDS = C1-C4, C6-C8, C10-C12, C19, C25, CAP ., X5R, 0.1µF 25V 20%, 0402 TDK, C1005X5R1E104M 2800 C29, C31, C33, C40 C5, C20 CAP ., NP0, 100pF 50V, 5%,1206 AVX, 12065A101JAT2A CAP ., X7R, 1µF 25V 10%, 0805... -
Page 6: Schematic Diagram
DEMO MANUAL DC1485A schematic Diagram dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from... -
Page 7: Assembly Drawings
DEMO MANUAL DC1485A assembly Drawings dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from... - Page 8 DEMO MANUAL DC1485A assembly Drawings dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 9 DEMO MANUAL DC1485A pcb layout anD Film Top Silkscreen Top Solder Paste Top Solder Mask dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 10 DEMO MANUAL DC1485A pcb layout anD Film Layer 1-Top Layer Layer 2-GND Plane 1 Layer 3- GND Plane 2 + PWR Traces dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 11 DEMO MANUAL DC1485A pcb layout anD Film Layer 4-Bottom Layer Bottom Solder Mask dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 12 DEMO MANUAL DC1485A pcb layout anD Film Bottom Solder Paste Bottom Silkscreen dc1485afa Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from Downloaded from...
- Page 13 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
- Page 14 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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