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DAC707KP-3 Folha de dados(PDF) 10 Page - Texas Instruments |
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DAC707KP-3 Folha de dados(HTML) 10 Page - Texas Instruments |
10 / 13 page ® DAC707/708/709 10 signal lines need to be isolated. The data is applied to pin 11 in a serial bit stream, MSB first. The WR input is used as a data strobe, clocking in each data bit. A RESET signal is provided for system startup and reset. These three signals are each optically isolated. Once the 16 bits of serial data have been strobed into the input register pair, the data is strobed through to the D/A register by the “carry” signal out of a 4-bit binary synchronous counter that has counted the 16 WR pulses used to clock in the data. The circuit diagram is given in Figure 10. CONNECTING MULTIPLE DAC707s TO A 16-BIT MICROPROCESSOR BUS Figure 11 illustrates the method of connecting multiple DAC707s to a 16-bit microprocessor bus. The circuit shown has two DAC707s and uses only one address line to select either the input register or the D/A register. An external address decoder selects the desired converter. BURN-IN SCREENING Burn-in screening is an option available for the DAC707. Burn-in duration is 160 hours at the temperature shown below (or equivalent combination of time and temperature). Product Temp. Range Burn-In Screening DAC707JP-BI 0 °C to 70°C 100 °C DAC707KP-BI 0 °C to 70°C 100 °C DAC707KH-BI –25 °C to +85°C 125 °C DAC707BH-BI –25 °C to +85°C 125 °C DAC707SH-BI –55 °C to +125°C 125 °C All units are tested after burn-in to ensure that grade speci- fications are met. APPLICATIONS LOADING THE DAC709 SERIALLY ACROSS AN ISOLATION BARRIER A very useful application of the DAC709 is in achieving low-cost isolation that preserves high accuracy. Using the serial input feature of the input register pair, only three |
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