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參數(shù)資料
| 型號(hào)： | AD581J |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Precision 10 V IC Reference |
| 中文描述： | 高精密10 V的IC參考 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大小： | 218K |
| 代理商： | AD581J |
AD581
REV. B
–5–
CONNECTION FOR REDUCED PRIMARY SUPPLY
While line regulation is specified down to 13 volts, the typical
AD581 will work as specified down to 12 volts or below. The
current sink capability allows even lower supply voltage capabil-
ity such as operation from 12 V
±5% as shown in Figure 10.
The 560
resistor reduces the current supplied by the AD581
to a manageable level at full 5 mA load. Note that the other
bandgap references, without current sink capability, may be
damaged by use in this circuit configuration.
Figure 10. 12-Volt Supply Connection
THE AD581 AS A CURRENT LIMITER
The AD581 represents an alternative to current limiter diodes
which require factory selection to achieve a desired current.
This approach often results in temperature coefficients of
1%/
°C. The AD581 approach is not limited to a defined set cur-
rent limit; it can be programmed from 0.75 mA to 5 mA with
the insertion of a single external resistor. Of course, the mini-
mum voltage required to drive the connection is 13 volts. The
AD580, which is a 2.5 volt reference, can be used in this type of
circuit with compliance voltage down to 4.5 volts.
Figure 11. A Two-Component Precision Current Limiter
NEGATIVE 10-VOLT REFERENCE
The AD581 can also be used in a two-terminal “Zener” mode
to provide a precision –10.00 volt reference. As shown in Figure
12, the VIN and VOUT terminals are connected together to the
high supply (in this case, ground). The ground pin is connected
through a resistor to the negative supply. The output is now
taken from the ground pin instead of VOUT. With 1 mA flowing
through the AD581 in this mode, a typical unit will show a 2 mV
increase in output level over that produced in the three-terminal
mode. Note also that the effective output impedance in this con-
nection increases from 0.2
typical to 2 ohms. It is essential to
arrange the output load and the supply resistor, RS, so that the
net current through the AD581 is always between 1 mA and
5 mA. For operation to +125
°C, the net current should be be-
tween 2 mA and 5 mA. The temperature characteristics and
long-term stability of the device will be essentially the same as
that of a unit used in the standard three-terminal mode.
The AD581 can also be used in a two-terminal mode to develop
a positive reference. VIN and VOUT are tied together and to the
positive supply through an appropriate supply resistor. The per-
formance characteristics will be similar to those of the negative
two-terminal connection. The only advantage of this connection
over the standard three-terminal connection is that a lower pri-
mary supply can be used, as low as 10.5 volts. This type of op-
eration will require considerable attention to load and primary
supply regulation to be sure the AD581 always remains within
its regulating range of 1 mA to 5 mA (2 mA to 5 mA for opera-
tion beyond +85
°C).
Figure 12. Two Terminal Negative 10-Volt Reference
10 VOLT REFERENCE WITH MULTIPLYING CMOS D/A
OR A/D CONVERTERS
The AD581 is ideal for application with the entire AD7533
series of 10- and 12-bit multiplying CMOS D/A converters,
especially for low power applications. It is equally suitable for
the AD7574 8-bit A/D converter. In the standard hook-up, as
shown in Figure 14, the +10 volt reference is inverted by the
amplifier/DAC configuration to produce a 0 volt to –10 volt
range. If an AD308 amplifier is used, total quiescent supply
current will typically be 2 mA. If a 0 volt to +10 volt full-scale
range is desired, the AD581 can be connected to the CMOS
DAC in its –10 volt “Zener” mode, as shown in Figure 12 (the
–10 VREF output is connected directly to the VREF IN of the
CMOS DAC). The AD581 will normally be used in the
–10 volt mode with the AD7574 to give a 0 volt to +10 volt
ADC range. This is shown in Figure 14. Bipolar output applica-
tions and other operating details can be found in the data sheets
for the CMOS products.
Figure 13. Low Power 10-Bit CMOS DAC Application
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