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AD580 Datasheet(PDF) 5 Page - Analog Devices

Part # AD580
Description  High Precision 2.5 V IC Reference
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD580 Datasheet(HTML) 5 Page - Analog Devices

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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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