QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466 OCTAL 12-BIT DAC WITH INTERNAL REFERENCE LTC2636 DESCRIPTION Demonstration circuit DC1466 features the LTC2636 Octal 12-bit DAC. This device has an integrated, high accuracy, low-drift reference. It has a rail-to-rail output buffer and is guaranteed monotonic. This DAC commu- nicates through the simple SPI/MICROWIREtm compatible interface. Design files for this circuit board are available. Call the LTC factory. Analog To DC590 Outputs Demoboard Type LTC2636 Variation Power Up Full Scale A LZ Zero 2.5V B LMI Midscale 2.5V C HZ Zero 4.096V D HMI Midscale 4.096 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466 OCTAL 12-BIT DAC WITH INTERNAL REFERENCE QUICK START PROCEDURE Connect DC1466 to a DC590 USB serial controller using 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 DC590 or download it from www.linear.com. The correct control panel will be loaded automatically. Click the COLLECT button to begin outputting codes to the DACs and reading back the resulting output voltage for each DAC. Complete software documentation is available from the Help menu item, as features may be added periodically. 2 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466 OCTAL 12-BIT DAC WITH INTERNAL REFERENCE HARDWARE SET-UP ANALOG CONNECTIONS DAC outputs – The eight DAC outputs from the LTC2636 are brought out to turrets labeled VOUTA through VOUTH. These may be connected to external instruments or other circuitry. NOTE: DAC outputs are not in alphabetical order on the circuit board. Vref – The Ref turret is connected directly to the reference terminals of the LTC2636 When the integrated reference is being used, the reference voltage may be monitored at this point. An external reference may also be applied to this turret after changing the setting in the QuickEval software. GROUNDING AND POWER CONNECTIONS Power (Vcc) – Normally DC1466 is powered by the DC590 controller. Vcc can be supplied to this turret, however the power supply on DC590 must be disabled! Refer to DC590 Quick Start Guide for more details on this mode of operation. Grounding – Ground turrets as well as 2 grounding strips are provided. 3 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC1466 OCTAL 12-BIT DAC WITH INTERNAL REFERENCE 4