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AD1403 датащи(PDF) 4 Page - Analog Devices

номер детали AD1403
подробное описание детали  Low Cost, Precision 2.5 V IC References
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домашняя страница  http://www.analog.com
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AD1403 датащи(HTML) 4 Page - Analog Devices

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AD1403/AD1403A
REV. A
–4–
The AD1403 exhibits a worst-case shift of 7.5 mV over the en-
tire range of operating input voltage, 4.5 volts to 40 volts. Typi-
cally, the shift is less than 1 mV as shown in Figure 3.
THE AD1403A AS A LOW POWER, LOW VOLTAGE
PRECISION REFERENCE FOR DATA CONVERTERS
The AD1403A has a number of features that make it ideally
suited for use with A/D and D/A data converters used in com-
plex 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
(1.5 mA quiescent current) is commensurate with that of CMOS-
type devices, while the low cost and small package complements
the decreasing cost and size of the latest converters.
Figure 8 shows the AD1403A used as a reference for the
AD7524 low-cost 8-bit CMOS DAC with complete micro-
Figure 8. Low Power, Low Voltage Reference for the
AD7524 Microprocessor-Compatible 8-Bit DAC
processor interface. The AD1403A and the AD7524 are speci-
fied 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 AD7524 includes an 8-bit data regis-
ter, and address decoding logic; it may thus be interfaced di-
rectly to an 8- or 16-bit data bus. Only 300
µA of quiescent
current from the single +5 volt supply is required to operate the
AD7524 which is packaged in a small 16-pin DIP. The AD542
output amplifier is also low power, requiring only 1.5 mA quies-
cent current. Its laser-trimmed offset voltage preserves the
±1/2
LSB linearity of the AD7524KN without user trims and it typi-
cally settles to
±1/2 LSB in less than 5 microseconds. It will pro-
vide the 0 volt to –2.5 volt output swing from
±5 volt supplies.
THE AD1403 AS A PRECISION PROGRAMMABLE
CURRENT SOURCE
The AD1403 is an excellent building block for precision current
sources. Its wide range of operating voltages, 4.5 V to 40 V,
along with excellent line regulation over that range (7.5 mV)
result in high insensitivity to varying load impedances. The low
quiescent current (II) of 1.5 mA (max) and the maximum speci-
fied maximum load current of 10 mA allows the user to pro-
gram current to any value between 1.5 mA and 10 mA.
Figure 9a shows the AD1403 connected as a current source.
Total current is equal to the quiescent current plus the load
current. Most of the temperature coefficient comes from the
quiescent current term II, which has a typical TC of 0.13%/°C
(1300 ppm/
°C). The load voltage (and hence current) TC is
much lower at
±40 ppm/°C max (AD1403). Therefore, the
overall temperature coefficient decreases rapidly as the load cur-
rent is increased. Figure 9b shows the typical temperature coef-
ficient for currents between 1.5 mA and 10 mA. Use of an
AD1403A will not improve the TC appreciably.
Figure 9a. The AD1403 as a Precision Programmable
Current Source
Figure 9b. Typical Temperature Coefficient of Current
Source
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
Applying the AD1403/AD1403A
8-Pin Mini-DIP (N)


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