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| 型号： | REF3233AIDBVR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 3.3 V, PDSO6 |
| 封装： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 2/18页 |
| 文件大小： | 537K |
| 代理商： | REF3233AIDBVR |
REF3212,REF3220
REF3225,REF3230
REF3233,REF3240
SBVS058B JUNE 2005 REVISED FEBRUARY 2006
www.ti.com
10
LONG-TERM STABILITY
Long-term stability refers to the change of the output
voltage of a reference over a period of months or years.
This effect lessens as time progresses, as is shown by the
long-term stability Typical Characteristic curves. The
typical drift value for the REF32xx is 55ppm from 0 to 1000
hours. This parameter is characterized by measuring 30
units at regular intervals for a period of 1000 hours.
LOAD REGULATION
Load regulation is defined as the change in output voltage
as a result of changes in load current. The load regulation
of the REF32xx is measured using force and sense
contacts, as shown in Figure 4. The force and sense lines
can be used to effectively eliminate the impact of contact
and trace resistance, resulting in accurate voltage at the
load. By connecting the force and sense lines at the load,
the REF32xx compensates for the contact and trace
resistances because it measures and adjusts the voltage
actually delivered at the load.
1
2
3
6
5
4
R
LOAD
0.47
F
+5V
GND_F
Contact and Trace Resistance
GND_S
SHDN
OUT_F
OUT_S
IN
REF32xx
Figure 4. Accurate Load Regulation of REF32xx
APPLICATION CIRCUITS
NEGATIVE REFERENCE VOLTAGE
For applications requiring a negative and positive
reference voltage, the REF32xx and OPA735 can be used
to provide a dual-supply reference from a
±5V supply.
Figure 5 shows the REF3225 used to provide a
±2.5V
supply reference voltage. The low drift performance of the
REF32xx complements the low offset voltage and zero
drift of the OPA735 to provide an accurate solution for
split-supply applications. Care must be taken to match the
temperature coefficients of R1 and R2.
2.5V
+2.5V
+5V
1
2
5
6
34
NOTE: Bypass capacitor is not shown.
R
1
10k
R
2
10k
5V
+5V
OPA735
REF3225
Figure 5. REF3225 Combined with OPA735 to
Create Positive and Negative Reference Voltages
DATA ACQUISITION
Data acquisition systems often require stable voltage
references to maintain accuracy. The REF32xx family
features stability and a wide range of voltages suitable for
most microcontrollers and data converters. Figure 6,
Figure 7, and Figure 8 show basic data acquisition
systems.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REF3233AIDBVRG4 | 功能描述:基准电压& 基准电流 3.3V 4ppm/DegC 100uA SOT23-6 Series RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF3233AIDBVT | 功能描述:基准电压& 基准电流 3.3V 4ppm/DegC 100uA SOT23-6 Series RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF3233AIDBVTG4 | 功能描述:基准电压& 基准电流 3.3V 4ppm/DegC 100uA SOT23-6 Series RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF3233AMDBVREP | 功能描述:基准电压& 基准电流 Mil Enhance 4ppm 100 uA Ser Vltg Ref RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| REF3233AMDBVREPG4 | 功能描述:基准电压& 基准电流 EP 4Ppm/Deg 100Ua Ser Vltg Ref RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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