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DAC5674 Folha de dados(PDF) 2 Page - Texas Instruments |
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DAC5674 Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 39 page DAC5674 SLWS148A − SEPTEMBER 2003 − REVISED OCTOBER 2005 www.ti.com 2 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. The DAC5674 operates from an analog supply voltage of 3.3 V and a digital supply voltage of 1.8 V. The digital I/Os are 1.8-V and 3.3-V CMOS compatible. Power dissipation is 500 mW at maximum operating conditions. The DAC5674 provides a nominal full-scale differential current-output of 20 mA, supporting both single-ended and differential applications. The output current can be directly fed to the load with no additional external output buffer required. The device has been specifically designed for a differential transformer coupled output with a 50- Ω doubly terminated load. For a 20-mA full-scale output current, both a 4:1 impedance ratio (resulting in an output power of 4 dBm) and 1:1 impedance ratio transformer (−2-dBm output power) are supported. The latter configuration is preferred for optimum performance at high output frequencies and update rates. An accurate on-chip 1.2-V temperature compensated band-gap reference and control amplifier allows the user to adjust the full-scale output current from 20 mA down to 2 mA. This provides 20-dB gain range control capabilities. Alternatively, an external reference voltage may be applied for maximum flexibility. The device features a SLEEP mode, which reduces the standby power to approximately 10 mW, thereby optimizing the power consumption for the system’s need. The DAC5674 is available in a 48-pin HTQFP PowerPAD plastic quad flatpack package. The device is characterized for operation over the industrial temperature range of −40 °C to 85°C. AVAILABLE OPTIONS TA PACKAGED DEVICES 48-HTQFP PowerPAD Plastic Quad Flatpack −40 °C to 85°C DAC5674IPHP −40 C to 85 C DAC5674IPHPR ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range unless otherwise noted(1) UNIT Supply voltage range AVDD(2), CLKVDD(2), IOVDD(2), PLLVDD(2) −0.5 V to 4 V Supply voltage range DVDD(3) −0.5 V to 2.3 V Voltage between AGND, DGND, CLKGND, PLLGND, and IOGND −0.5 V to 0.5 V D[13..0](3), HP1, HP2, DIV0(3), DIV1(3), PLLLOCK(3), RESET(3), X4(3) −0.5 V to IOVDD + 0.5 V Supply voltage range IOUT1, IOUT2(2) −1 V to AVDD + 0.5 V Supply voltage range EXTIO(2), EXTLO(2), BIASJ(2), SLEEP(2), CLK(2), CLKC(2), LPF(2) −0.5 V to AVDD + 0.5 V Peak input current (any input) 20 mA Peak total input current (all inputs) −30 mA Operating free-air temperature range, TA: DAC5674I −40 °C to 85°C Storage temperature range −65 °C to 150°C Lead temperature 1,6 mm (1/16 inch) from the case for 10 seconds 260 °C (1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) Measured with respect to AGND. (3) Measured with respect to DGND. |
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Descrição semelhante - DAC5674 |
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