DEMO MANUAL DC2459A LTC1668 16-Bit, 50Msps DAC DESCRIPTION Demonstration circuit 2459A features the LTC 1668, 16-bit, (Altera Cyclone 5 SoC), C5G (Altera Cyclone 5), DE0 Nano 50Msps current output DAC in a 28-lead SSOP package. (Altera Cyclone 4), Embedded Micro Mojo (Xilinx Spartan 1 Pin-compatible 14-bit and 12-bit versions are available for 6), and Numato Labs Mimas (Xilinx Spartan 6) boards . lower resolution requirements, but all DC2459A assembly Design files for this circuit board are available at types are populated with the LTC1668. DEMO MANUAL DC2459A ASSEMBLY OPTIONS Table 1. Demonstration Circuit Output Options ASSEMBLY TYPE OP AMP OUTPUT DC2459A-A LT1812 Single-Ended: 1V (2V ) P-P DC2459A-B LT6600 Differential: 0.25V (1V ) P-P DC2459A-C LT1468 Single-Ended: 10V (20V ) P-P QUICK START PROCEDURE The LTC1668 is a general purpose DAC with a wide range 1. There are several options for providing digital data to of applications. Depending on the end application, the the DC2459A, shown in Figures 2 to 6. Connect the best data source for evaluating the LTC1668 may be a DC2459A to a digital pattern generator (which can be digital pattern generator or the actual customer application the customer application circuit) or supported low cost circuit. However, a basic test of distortion and signal-to- FPGA board. Do not enable the data source until power noise ratio using a sinewave output can be a valuable first is applied to the DC2459A. step in evaluating the performance of the LTC1668. As When using the Mojo board, install a 0 resistor on such, several example FPGA programs are provided that R28, which is located on the bottom of the board. This produce a sinewave output. routes the clock signal to the correct input for the Mojo board. DC2459a F02 Figure 2. Basic Connection to Digital Pattern Generator dc2459af 2