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| 型号： | AD584TH |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC ADJ TO-99-8 |
| 标准包装： | 1 |
| 基准类型： | 串联，可调节，精度 |
| 输出电压： | 2.5V，5V，7.5V，10V |
| 容差： | ±10% |
| 温度系数： | 15ppm/°C |
| 输入电压： | 4.5 V ~ 30 V |
| 通道数： | 1 |
| 电流 - 静态： | 1mA |
| 电流 - 输出： | 10mA |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-99-8 金属罐 |
| 供应商设备封装： | TO-99-8 |
| 包装： | 散装 |
| 产品目录页面： | 795 (CN2011-ZH PDF) |
AD584
THEORY OF OPERATION
APPLYING THE AD584
With power applied to Pin 8 and Pin 4 and all other pins open,
the AD584 produces a buffered nominal 10.0 V output between
Pin 1 and Pin 4 (see Figure 3). The stabilized output voltage can
be reduced to 7.5 V, 5.0 V, or 2.5 V by connecting the programming
Data Sheet
approximately 20 V, even for the large values of R1. Do not
omit R2; choose its value to limit the output to a value that can
be tolerated by the load circuits. If R2 is zero, adjusting R1 to its
lower limit results in a loss of control over the output voltage.
When precision voltages are set at levels other than the standard
outputs, account for the 20% absolute tolerance in the internal
resistor ladder.
Table 4.
Output
Voltage (V)
7.5
5.0
2.5
Pin Programming
Join the 2.5 V (Pin 3) and 5.0 V (Pin 2) pins.
Connect the 5.0 V pin (Pin 2) to the output pin (Pin 1).
Connect the 2.5 V pin (Pin 3) to the output pin (Pin 1).
Alternatively, the output voltage can be raised by loading the
2.5 V tap with R3 alone. The output voltage can be lowered by
connecting R4 alone. Either of these resistors can be a fixed
resistor selected by test or an adjustable resistor. In all cases, the
resistors should have a low temperature coefficient to match the
AD584 internal resistors, which have a negative temperature
The options shown in Table 4 are available without the use of any
additional components. Multiple outputs using only one AD584
can be provided by buffering each voltage programming pin
with a unity-gain, noninverting op amp.
coefficient less than 60 ppm/°C. If both R3 and R4 are used,
these resistors should have matching temperature coefficients.
When only small adjustments or trims are required, the circuit
in Figure 4 offers better resolution over a limited trim range. The
AD584
1.215V
8
*
V SUPPLY
10V
24k?
5V
12k?
1
2
V OUT
R4
circuit can be programmed to 5.0 V, 7.5 V, or 10 V, and it can be
adjusted by means of R1 over a range of about ±200 mV. To trim
the 2.5 V output option, R2 (see Figure 4) can be reconnected to
the band gap reference (Pin 6). In this configuration, limit the
adjustment to ±100 mV to avoid affecting the performance of
V+
2.5V
R1
V BG
6k?
3
R3
8
1
10.0V
V OUT
COMMON
4
6k?
6
R2
AD584
2
3
6
5.0V
2.5V
V BG
R2
300k?
R1
10k?
* THE 2.5V TAP IS USED INTERNALLY AS A BIAS POINT
AND SHOULD NOT BE CHANGED BY MORE THAN 100mV
4
Q11
IN ANY TRIM CONFIGURATION.
Figure 3. Variable Output Options
The AD584 can also be programmed over a wide range of output
voltages, including voltages greater than 10 V, by the addition
of one or more external resistors. Figure 3 illustrates the general
adjustment procedure, with approximate values given for the
internal resistors of the AD584 . The AD584 may be modeled
as an op amp with a noninverting feedback connection, driven
by a high stability 1.215 V band gap reference (see Figure 5 for
schematic).
SUB
R40
Q10
Q16
COMMON
Figure 4. Output Trimming
R41
Q20
Q8
C52
Q12 Q15
C51 Q6 Q14
Q5
Q13
R42
R34
R37
R35
Q7
V+
STROBE
OUT 10V
5V TAP
2.5V TAP
When the feedback ratio is adjusted with external resistors, the
output amplifier can be made to multiply the reference voltage
CAP
C50
R33
R32
by almost any convenient amount, making popular outputs of
10.24 V, 5.12 V, 2.56 V, or 6.3 V easy to obtain. The most general
adjustment (which gives the greatest range and poorest resolution)
uses R1 and R2 alone (see Figure 3). As R1 is adjusted to its upper
limit, the 2.5V pin (Pin 3) is connected to the output, which
Q3
Q4
R39
R 38
Q2
R30
R31
Q1
R36
V BG
V–
reduces to 2.5 V. As R1 is adjusted to its lower limit, the output
voltage rises to a value limited by R2. For example, if R2 is
approximately 6 kΩ, the upper limit of the output range is
Rev. C | Page 6 of 12
Figure 5. Schematic Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD584TH/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference |
| AD584TH/883B | 制造商:Analog Devices 功能描述:V-Ref Programmable 2.5V/5V/7.5V/10V 10mA 8-Pin TO-99 制造商:Analog Devices 功能描述:V-REF PROGRAMMABLE 2.5V/5V/7.5V/10V 10MA 8PIN TO-99 - Rail/Tube 制造商:Analog Devices 功能描述:IC - PROGRAMMABLE V REF. 制造商:Analog Devices 功能描述:IC VOLT REF PROG 制造商:Analog Devices Inc. 功能描述:Voltage & Current References IC PROG V REF |
| AD584TH/HR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference |
| AD584TQ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference |
| AD584TQ/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage Reference |
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