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DAC14135 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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DAC14135 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 12 page  9 http://www.national.com General Description The DAC14135 Evaluation Board is intended to aid in evaluating the performance of the DAC14135. The board allows the user to exercise the inputs to the DAC and examine the output in either differential or single ended mode. The board comes complete with the DAC14135, a transformer network to convert a single ended clock to a differential clock, a transformer to convert the differential output from IOUTT and IOUTF to a single ended output, and an edge connector. This is a 5V part, but if a 3.3V CMOS or TTL digital data interface is required, the digital supply (DVDD) should be 3.3V. A 3.3V regulator is provided so that the board can be run off of a single 5V supply. For the best distortion performance at the maximum clock frequency, DVDD should be set to 5V. Setup and Configuration There are two terminal blocks on the DAC14135 evaluation board, one in the upper left corner next to the AMP connectors, and one in the upper right corner. The upper right corner has the analog power supply connector, marked +AVDD. The connector in the upper left is for the digital power supply and is marked +DVDD. There is also a jumper next to the +DVDD terminal block marked DVDD with one end marked DIRECT and the other end marked +3.3V REG. There are three ways to power the evaluation board. The default method of use is to connect the 5V power supply to both the +AVDD terminal block and the +DVDD terminal block and connect the jumper between the DIRECT pin (pin 1) and the middle pin (pin 2). If a 3.3V CMOS or TTL digital data interface is required, connect the jumper between the +3.3V REG pin (pin 3) and the middle pin (pin 2). This enables the 3.3V regulator on the back side of the board. The output of the regulator is filtered and powers the digital portion of the DAC. To use the board in the dual supply mode, connect a 5V supply to the +AVDD terminal block, connect a 3.3V supply to the +DVDD terminal block and connect the jumper between the DIRECT pin (pin 1) and the middle pin (pin 2). This bypasses the on-board voltage regulator, although the regulator still draws power. Getting Data to the Evaluation Board The DAC14135 evaluation board is shipped with the edge connectors J1 and J2 being the default data input interface. J1 and J2 are AMP 536511-1 and 536511-3 edge connectors respectively. Data should be at the same voltage level as DVDD. Figure 5 below, is an edge- on view of J2. Pins 24D-11D are the data lines with 24D being the MSB. The ground pins are 23C, 23A, 21C, 19C, 17C, 17A, 15C, 13C, 11C, 11A, 9C, 7C, 6A, 5C, 3C, and 1C. All ground pins are tied together on-board. Also, pin 10D should be at logic LOW (0V) if the data scramble feature on the DAC14135 is not used. Driving the Clock Input The evaluation board has an on-board transformer, T2, that converts a single ended clock to a differential clock to drive the DAC14135. For best results drive the CLOCK SMA connector with a low jitter 50 Ω source. If a sinusoidal source is used, its peak-to-peak amplitude should be at least 2.5V to meet the minimum clock input slew rate requirement. Back-to-back diodes at the sec- ondary of the transformer T2 limit the voltage swing at the DAC14135 Clock T and Clock F input pins. Measuring the Analog Outputs The evaluation board is shipped with transformer T1 installed to convert the differential output to a single ended output. However, the 0 Ω resistors R38 and R39 are not installed. To take single ended measurements, install R38 and R39 and attach your instrument to the SMA connector marked ‘SINGLE’. For differential output measurements, remove R38 and R39 if they are installed. Note that both outputs, IOUTT and IOUTF, are terminated with 50 Ω. DAC14135 Evaluation Board Description Figure 5: Pinout for J2 (Amp 536511-3) 24D 23D 22D 21D 20D 19D 18D 17D 16D 15D 14D 13D 12D 11D 10D 9D 8D 7D 6D 5D 4D 3D 2D 1D 24C 23C 22C 21C 20C 19C 18C 17C 16C 15C 14C 13C 12C 11C 10C 9C 8C 7C 6C 5C 4C 3C 2C 1C 24B 23B 22B 21B 20B 19B 18B 17B 16B 15B 14B 13B 12B 11B 10B 9B 8B 7B 6B 5B 4B 3B 2B 1B 24A 23A 22A 21A 20A 19A 18A 17A 16A 15A 14A 13A 12A 11A 10A 9A 8A 7A 6A 5A 4A 3A 2A 1A |
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