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Linear Technology DC1792A Manual

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Description
Demonstration circuit 1792A features the LTC2756 18-bit
SoftSpan™, I
OUT
4-wire Serial Peripheral Interface (SPI) interface, aug-
mented with separate CLEAR and LDAC pins that reset
the output to zero and load the DAC code, respectively.
This device features six output ranges: 0V to 5V, 0V to
10V, ±5V, ±10V, ±2.5V, and –2.5V to 7.5V. These ranges
are programmable through the SPI interface or through
BoarD photo
ANALOG POWER SUPPLY
Quick start proceDure
Connect a low noise ±15V power supply to the AMPV
–
and AMPV
turret posts at the left side of the DC1792A
board. Connect J1 to a DC590 USB serial controller us-
ing the supplied 14-conductor ribbon cable. Connect
DC590 to a host PC with a standard USB A/B cable.
Run the evaluation software supplied with the DC590,
or download it from www.linear.com/software. The cor-
rect control panel will be loaded automatically, shown in
Arrow.com.
Downloaded from
DAC. The digital interface is a simple,
RIBBON CABLE TO
DC590 CONTROLLER
(NORMALLY ±15V)
DEMO MANUAL DC1792A
Serial 18-Bit SoftSpan I
separate span control pins if SoftSpan operation is not
needed. Voltage input offset and gain adjustment pins
facilitate trimming of residual DC errors without impacting
the excellent temperature stability of this device.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, µModule, 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.
Figure 1. Connection Diagram
+
Figure 2. The software automatically sets the LTC2756
outputs according to the entries in the control panel. A
square wave option is available to test settling time. MSPAN
jumper should be set to 0 if software span control is desired.
Setting MSPAN high (1) causes the S2, S1, S0 pins to set
the span according to the table printed on the board, and
the corresponding span should be selected in software to
ensure that the calculated DAC code is correct.
LTC2756
DAC
OUT
DAC
OUTPUT
dc1792af
1

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Summary of Contents for Linear Technology DC1792A

  • Page 1 10V, ±5V, ±10V, ±2.5V, and –2.5V to 7.5V. These ranges L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks are programmable through the SPI interface or through and SoftSpan and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC1792A Quick start proceDure Additional software documentation may be available from : Select source for 5V V supply. Set to 5V for sup- the Help menu item, as features may be added periodically. ply by onboard LTC6655 reference (recommended). Set to REG to be supplied by regulated supply from DC590 Controller and remove the jumper to supply externally.

  • Page 3: Parts List

    DEMO MANUAL DC1792A parts List ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components C1, C2, C3, C5, C6, C11, C13, C15, CAP ., X7R, 10µF , 10V, 20% 1206 TDK, C3216X5R1A106M C18, C19, C20 C4, C36, C37, C40, C41 CAP ., X7R, 0.1µF , 10V, 10% 0603...

  • Page 4: Schematic Diagram

    DEMO MANUAL DC1792A schematic Diagram dc1792af Arrow.com. Arrow.com. Arrow.com. Arrow.com. Downloaded from Downloaded from Downloaded from Downloaded from...
  • Page 5 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 6 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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Ltc2756

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