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AD580K Datasheet(PDF) 5 Page - Analog Devices |
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AD580K Datasheet(HTML) 5 Page - Analog Devices |
5 / 6 page AD580 REV. A –5– Figure 8. Input Current vs. Input Voltage (Integral Loads) THE AD580 AS A CURRENT LIMITER The AD580 represents an excellent alternative to current lim- iter diodes which require factory-selection to achieve a desired current. This approach often results in temperature coefficients of 1%/ °C. The AD580 approach is not limited to a specially selected factory set current limit; it can be programmed from 1 mA to 10 mA with the insertion of a single external resistor. The approximate temperature coefficient of current limit for the AD580 used in this mode is 0.13%/ °C for I LIM = 1 mA and 0.01%/ °C for I LIM = 13 mA (see Figure 9). Figure 8 displays the high output impedance of the AD580 used as a current lim- iter for ILIM = 1, 2, 3, 4, 5 mA. Figure 9. A Two-Component Precision Current Limiter THE AD580 AS A LOW POWER, LOW VOLTAGE PRECISION REFERENCE FOR DATA CONVERTERS The AD580 has a number of features that make it ideally suited for use with A/D and D/A data converters used in complex microprocessor-based systems. The calibrated 2.500 volt output minimizes user trim requirements and allows operation from a single low voltage supply. Low power consumption (1 mA quiescent current) is commensurate with that of CMOS-type de- vices, while the low cost and small package complements the de- creasing cost and size of the latest converters. Figure 10 shows the AD580 used as a reference for the AD7542 12-bit CMOS DAC with complete microprocessor interface. The AD580 and the AD7542 are specified to operate from a single 5 volt supply; this eliminates the need to provide a +15 volt power supply for the sole purpose of operating a reference. The AD7542 includes three 4-bit data registers, a 12-bit DAC register, and address decoding logic; it may thus be interfaced directly to a 4-, 8- or 16-bit data bus. Only 8 mA of quiescent current from the single +5 volt supply is required to operate the AD7542 which is packaged in a small 16-pin DIP. The AD544 output amplifier is also low power, requiring only 2.5 mA quies- cent current. Its laser-trimmed offset voltage preserves the ±1/2 LSB linearity of the AD7542KN without user trims and it typically settles to ±1/2 LSB in less than 3 µs. It will provide the 0 volt to –2.5 volt output swing from ±5 volt supplies. Figure 10. Low Power, Low Voltage Reference for the AD7542 Microprocessor-Compatible 12-Bit DAC |
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