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PDF AD580 Data sheet ( Hoja de datos )
| Número de pieza | AD580 | |
| Descripción | High Precision 2.5 V IC Reference | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Laser Trimmed to High Accuracy: 2.500 V ؎ 0.4%
3-Terminal Device: Voltage In/Voltage Out
Excellent Temperature Stability: 10 ppm/؇C (AD580M, U)
Excellent Long-Term Stability: 250 V (25 V/Month)
Low Quiescent Current: 1.5 mA max
Small, Hermetic IC Package: TO-52 Can
MIL-STD-883 Compliant Versions Available
High Precision
2.5 V IC Reference
AD580*
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
The AD580 is a three-terminal, low cost, temperature compen-
sated, bandgap voltage reference which provides a fixed 2.5 V
output for inputs between 4.5 V and 30 V. A unique combina-
tion of advanced circuit design and laser-wafer trimmed thin-
film resistors provide the AD580 with an initial tolerance of
± 0.4%, a temperature stability of better than 10 ppm/°C and
long-term stability of better than 250 µV. In addition, the low
quiescent current drain of 1.5 mA max offers a clear advantage
over classical Zener techniques.
The AD580 is recommended as a stable reference for all 8-, 10-
and 12-bit D-to-A converters that require an external reference.
In addition, the wide input range of the AD580 allows operation
with 5 volt logic supplies making the AD580 ideal for digital
panel meter applications or whenever only a single logic power
supply is available.
The AD580J, K, L and M are specified for operation over the
0°C to +70°C temperature range; the AD580S, T and U are
specified for operation over the extended temperature range of
–55°C to +125°C.
PRODUCT HIGHLIGHTS
1. Laser-trimming of the thin-film resistors minimizes the
AD580 output error. For example, the AD580L output
tolerance is ± 10 mV.
2. The three-terminal voltage in/voltage out operation of
the AD580 provides regulated output voltage without
any external components.
3. The AD580 provides a stable 2.5 V output voltage for
input voltages between 4.5 V and 30 V. The capability
to provide a stable output voltage using a 5-volt input
makes the AD580 an ideal choice for systems that con-
tain a single logic power supply.
4. Thin-film resistor technology and tightly controlled
bipolar processing provide the AD580 with temperature
stabilities to 10 ppm/°C and long-term stability better
than 250 µV.
5. The low quiescent current drain of the AD580 makes it
ideal for CMOS and other low power applications.
6. The AD580 is available in versions compliant with
MIL-STD-883. Refer to the Analog Devices Military
Products Databook or current AD580/883B data sheet
for detailed specifications.
*Protected by Patent Nos. 3,887,863; RE30,586.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
1 page  
AD580
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 ILIM = 1 mA and
0.01%/°C for ILIM = 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.
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 9. A Two-Component Precision Current Limiter
Figure 10. Low Power, Low Voltage Reference for the
AD7542 Microprocessor-Compatible 12-Bit DAC
REV. A
–5–
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet AD580.PDF ] | |
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