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Linear Technology DC1485A Demo Manual

Ltc2757: 18-bit, parallel input, softspan iout dac
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DESCRIPTION
Demonstration circuit 1485A features the LTC
18-bit SoftSpan™ I
DAC with ±1LSB maximum INL. This
OUT
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.
RIBBON CABLE
CONTROLLER
®
2757A single
TO DC590
Figure 1. Connection Diagram
DEMO MANUAL DC1485A
18-Bit, Parallel Input,
SoftSpan I
Design fi les 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 is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
ANALOG POWER SUPPLY
(NORMALLY ±15V)
LTC2757:
DAC
OUT
DAC
CONNECTIONS
dc1485af
1

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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 is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    Connect a clean ±15V power supply to the turret posts at available to test settling time. MSPAN jumper should be in the bottom of the DC1485A board. Connect J1 to a DC590 USB serial controller using the supplied 14-conductor rib- the lower position if software span control is desired.

  • Page 3: Using The Parallel Connector

    Protocol vation of the data or span I/O pins (D0 to D17 or S0 to The DC1485A can be used without the DC590 system. If S2, respectively), along with their respective dedicated a DC590 demo board is not connected the shift registers registers, for write or read operations.

  • 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. confi gure the LTC2757 for operation in a single, fi xed : 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 dc1485af...

  • Page 7: Assembly Drawings

    DEMO MANUAL DC1485A ASSEMBLY DRAWINGS dc1485af...
  • Page 8 DEMO MANUAL DC1485A ASSEMBLY DRAWINGS dc1485af...
  • Page 9 DEMO MANUAL DC1485A PCB LAYOUT AND FILM Top Silkscreen Top Solder Paste Top Solder Mask dc1485af...
  • 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 dc1485af...
  • Page 11 DEMO MANUAL DC1485A PCB LAYOUT AND FILM Layer 4-Bottom Layer Bottom Solder Mask dc1485af...
  • Page 12 DEMO MANUAL DC1485A PCB LAYOUT AND FILM Bottom Solder Paste Bottom Silkscreen dc1485af...
  • 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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