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AD581
THE AD581 AS A CURRENT LIMITER
The AD581 represents an alternative to current limiter diodes
that require factory selection to achieve a desired current. This
+V S
ANALOG
GND
approach often results in temperature coefficients of 1%/°C.
The AD581 approach is not limited to a defined set current
limit; it can be programmed from 0.75 mA to 5 mA with the
0.1μF
AD581
GND
V OUT
V REF
insertion of a single external resistor. Of course, the minimum
voltage required to drive the connection is 13 V. The AD580,
which is a 2.5 V reference, can be used in this type of circuit
with compliance voltage down to 4.5 V.
+V S
–10V
1.2k ? 5%
–15V
Figure 13. 2-Pin ?10 V Reference
10 V REFERENCE WITH MULTIPLYING CMOS DACs
OR ADCs
i ~ = ___ + 0.75mA
AD581
V OUT
GND
10V =
R
LOAD
10V
R
The AD581 is ideal for application with the entire AD7533
series of 10- and 12-bit multiplying CMOS DACs, especially for
low power applications. It is equally suitable for the AD7574
8-bit ADC. In the standard hook-up, as shown in Figure 15, the
BOTTOM VIEW OF
10V PRECISION
REFERENCE CIRCUIT
IN TO-5 CASE
Figure 12. A Two-Component Precision Current Limiter
NEGATIVE 10 V REFERENCE
The AD581 can also be used in a 2-pin Zener mode to provide a
precision ?10.00 V reference. As shown in Figure 13, the +V S and
V OUT pins are connected together to the high supply (in this
case, ground). The ground pin is connected through a resistor
to the negative supply. Thus, the output is taken from the
ground pin instead of V OUT . With 1 mA flowing through the
AD581 in this mode, a typical unit shows a 2 mV increase in
output level over that produced in the 3-pin mode. Note also
that the effective output impedance in this connection increases
+10 V reference is inverted by the amplifier/DAC configuration
to produce a 0 V to ?10 V range. If an OP1177 amplifier is used,
total quiescent supply current is typically 2 mA. If a 0 V to +10 V
full-scale range is desired, the AD581 can be connected to the
CMOS DAC in its ?10 V Zener mode, as shown in Figure 13
(the ?10 V REF output is connected directly to the V REF IN of the
CMOS DAC). The AD581 is normally used in the ?10 V mode
with the AD7574 to give a 0 V to +10 V ADC range. This is
shown in Figure 15. Bipolar output applications and other
operating details can be found in the data sheets for the CMOS
products.
+15V
+10V
AD581
from 0.2 Ω typical to 2 Ω. It is essential to arrange the output
load and the supply resistor, R S , 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 between 2 mA and 5 mA. The
DIGITAL
INPUT
V REF IN
BIT 1 (MSB)
4
5
15
14
16
1
R FEEDBACK
I OUT1
+15V
temperature characteristics and long-term stability of the device
V OUT
are essentially the same as that of a unit used in the standard
I OUT2
0V TO –10V
3-pin mode.
BIT 10 (LSB)
13
3
2
–15V
The AD581 can also be used in a 2-pin mode to develop a
positive reference. +V S and V OUT are tied together and to the
positive supply through an appropriate supply resistor. The
performance characteristics are similar to those of the negative
2-pin connection. The only advantage of this connection over
the standard 3-pin connection is that a lower primary supply
can be used, as low as 10.5 V. This type of operation requires con-
siderable attention to load and primary supply regulation to
maintain the AD581 within its regulating range of 1 mA to 5 mA
(2 mA to 5 mA for operation beyond +85°C).
GND
Figure 14. Low Power 10-Bit CMOS DAC Application
PRECISION 12-BIT DAC REFERENCE
AD565A, like most DACs, is designed to operate with a +10 V
reference element. In the AD565A, this 10 V reference voltage is
converted into a reference current of approximately 0.5 mA via
the internal 19.95 kΩ resistor (in series with the external 100 Ω
trimmer). The gain temperature coefficient of the AD565A is
primarily governed by the temperature tracking of the 19.95 kΩ
resistor and the 5 kΩ to10 kΩ span resistors; gain TC is guaran-
teed to 3 ppm/°C. Thus, using the AD581L (at 5 ppm/°C) as the
Rev. C | Page 9 of 12
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相关代理商/技术参数
AD581LH/+ 制造商:Rochester Electronics LLC 功能描述:- Bulk
AD581S 制造商:AD 制造商全称:Analog Devices 功能描述:High Precision 10 V IC Reference
AD581SH 功能描述:IC VREF SERIES PREC 10V TO-5-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 标准包装:2,000 系列:- 基准类型:旁路，可调节，精度 输出电压:1.24 V ~ 16 V 容差:±0.5% 温度系数:- 输入电压:1.24 V ~ 16 V 通道数:1 电流 - 阴极:100µA 电流 - 静态:- 电流 - 输出:20mA 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:TO-226-3、TO-92-3（TO-226AA）成形引线 供应商设备封装:TO-92-3 包装:带卷 (TR)
AD581SH/883 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference
AD581SH/883B 制造商:Analog Devices 功能描述:V-Ref Precision 10V 10mA 3-Pin TO-5 Tube 制造商:Rochester Electronics LLC 功能描述:IC - 10V REFERENCE IC - Bulk 制造商:Analog Devices 功能描述:IC VOLT REF 10V 制造商:Analog Devices Inc. 功能描述:Voltage & Current References HI PREC 10V IC REF 制造商:Analog Devices Inc. 功能描述:Voltage & Current References IC - 10V REFERENCE IC
AD581SH/HR 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference
AD581SH1 制造商:AD 制造商全称:Analog Devices 功能描述:High Precision 10 V IC Reference
AD581T 制造商:AD 制造商全称:Analog Devices 功能描述:High Precision 10 V IC Reference