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参数资料
| 型号： | REF03GSZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 2.5V 8-SOIC |
| 产品变化通告： | Input Voltage Max Change 23/Mar/2009 |
| 标准包装： | 1,000 |
| 基准类型： | 串联，精度 |
| 输出电压： | 2.5V |
| 容差： | ±0.6% |
| 温度系数： | 50ppm/°C |
| 输入电压： | 4.5 V ~ 33 V |
| 通道数： | 1 |
| 电流 - 静态： | 1.4mA |
| 电流 - 输出： | 10mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
REF03
APPLICATIONS
The REF03 provides a stable 2.5 V output voltage with minimal
dependence on load current, line voltage, or temperature. This
voltage is typically used to set an absolute reference point in
data conversion circuits, or in analog circuits such as log amps,
4 mA to 20 mA transmitters, and power supplies. The REF03 is
of particular value in systems requiring a precision reference
using a single 5 V supply rail.
Because an on-board operational amplifier is used to amplify
the basic band gap cell voltage to 2.5 V, supply decoupling is
critical to the transient performance of a voltage reference. The
supply line should be bypassed with a 10 μF tantalum capacitor
GENERATING A ?2.5 V REFERENCE
Often, there is a requirement for a negative reference voltage.
The simplest method of generating a ?2.5 V reference with the
REF03 is to connect an op amp in a gain of ?1 to the output, as
shown in Figure 17. This provides both positive and negative
2.5 V references. Figure 18 shows another method of obtaining
a negative reference, in which the current-output element is a
PNP transistor, with the REF03 in a servo loop to ensure that
the output remains 2.5 V below ground.
V+
in parallel with a 0.01 μF to 0.1 μF ceramic capacitor for best
results, as shown in Figure 15. The bypass capacitors should
be located as close to the reference as possible. Inadequate
bypassing can lead to instabilities.
Output bypass capacitors are not generally recommended. If
necessary for high frequency output impedance reduction, the
2
V IN
V OUT
REF03
GND
4
6
100k ?
100k ?
+2.5V
capacitance value used should be at least 1 μF.
If the V TEMP and TRIM pins are not in use, then they should be
left floating. However, when V TEMP is being used for temperature
2
3
7
OP97
4
6
–2.5V
compensation, it must be connected to a very high impedance
node in the circuit, such as a noninverting input of a buffer.
V–
Figure 17. ±2.5 V Reference
NC
NC
+5V
INPUT VOLTAGE
10μF 0.1μF
V IN
V TEMP
GND
REF03
NC
V OUT
TRIM
OUTPUT VOLTAGE
1k ?
2
V IN
V OUT
6
GND
Figure 15. Basic Connections
REF03
GND
GENERATING AN ADJUSTABLE BIPOLAR
VOLTAGE REFERENCE
There is often a requirement for an adjustable bipolar reference.
A simple method of generating such a reference is to connect
4
+6.2V
2N2905
2k ?
–2.5V
the output of the REF03 to an op amp in an adjustable gain
configuration, as shown in Figure 16. The trimmable resistor
is then used to generate the desired output voltage from ?2.5 V
to +2.5 V.
V+
–5V
Figure 18. ?2.5 V Reference
2
50k ?
OP97
V IN
V OUT
REF03
6
50k ?
50k ?
2
3
7
4
+15V
6
V OUT
–2.5V TO +2.5V
GND
4
V+
Figure 16. Adjustable Bipolar Reference
Rev. G | Page 7 of 12
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相关代理商/技术参数 |
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| REF03P | 制造商:未知厂家 制造商全称:未知厂家 功能描述:+2.5V Precision Voltage Reference(282.09 k) |
| REF03S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:+2.5V Precision Voltage Reference(282.09 k) |
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