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| 型號： | REF3220AIDBVTG4 |
| 英文描述： | 4ppm/C, 100UA, SOT23-6 SERIES VOLTAGE REFERENCE |
| 中文描述： | 百萬分之4 / ?，100uA的，采用SOT23 - 6系列電壓基準(zhǔn) |
| 文件頁數(shù)： | 8/15頁 |
| 文件大小： | 315K |
| 代理商： | REF3220AIDBVTG4 |
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SBVS058B JUNE 2005 REVISED FEBRUARY 2006
www.ti.com
8
TYPICAL CHARACTERISTICS (continued)
At TA = +25
°
C, I
LOAD
= 0mA, VIN = +5V power supply, REF3225 is used for typical characteristics, unless otherwise noted.
LONGTERM STABILITY
(32 Units)
200
150
100
50
0
50
100
150
200
O
0
400
200
600
800
1000
1200
Time (Hours)
THEORY OF OPERATION
The REF32xx is a family of CMOS, precision bandgap
voltage references. Figure 1 shows the basic bandgap
topology. Transistors Q
1
and Q
2
are biased so that the
current density of Q
1
is greater than that of Q
2
. The
difference of the two base-emitter voltages (Vbe
1
– Vbe
2
)
has a positive temperature coefficient and is forced across
resistor R
1
. This voltage is amplified and added to the
base-emitter voltage of Q
2
, which has a negative
temperature coefficient. The resulting output voltage is
virtually independent of temperature.
V
BANDGAP
Vbe
1
+
Vbe
2
+
R
1
Q
2
N
Q
1
I
Figure 1. Simplified Schematic of Bandgap
Reference
APPLICATION INFORMATION
The REF32xx does not require a load capacitor and is
stable with any capacitive load. Figure 2 shows typical
connections required for operation of the REF32xx. A
supply bypass capacitor of 0.47
μ
F is recommended.
1
2
3
6
5
4
+2.5V
0.47
μ
F
+5V
R
Figure 2. Typical Operating Connections for the
REF3225
SUPPLY VOLTAGE
The REF32xx family of references features an extremely
low dropout voltage. With the exception of the REF3212,
which has a minimum supply requirement of 1.8V, these
references can be operated with a supply of only 5mV
above the output voltage in an unloaded condition. For
loaded conditions, a typical dropout voltage versus load is
shown in the Typical Characteristic curves.
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| REF3225AIDBVRG4 | 4ppm/C, 100UA, SOT23-6 SERIES VOLTAGE REFERENCE |
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| REF3230AIDBVRG4 | 4ppm/C, 100UA, SOT23-6 SERIES VOLTAGE REFERENCE |
| REF3230AIDBVTG4 | 4ppm/C, 100UA, SOT23-6 SERIES VOLTAGE REFERENCE |
| REF3233AIDBVRG4 | 4ppm/C, 100UA, SOT23-6 SERIES VOLTAGE REFERENCE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF3220AMDBVREP | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Mil Enhance 4ppm 100 uA Ser Vltg Ref RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| REF3220-EP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4 ppm100 A SOT23-6 SERIES VOLTAGE REFERENCES |
| REF3225 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4ppm/C 100A, SOT23-6 SERIES VOLTAGE REFERENCE |
| REF3225AIDBVR | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 2.5V 4ppm/DegC 100uA SOT23-6 Series RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
| REF3225AIDBVRG4 | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 2.5V 4ppm/DegC 100uA SOT23-6 Series RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Voltage References 拓?fù)浣Y(jié)構(gòu):Shunt References 參考類型:Programmable 輸出電壓:1.24 V to 18 V 初始準(zhǔn)確度:0.25 % 平均溫度系數(shù)（典型值）:100 PPM / C 串聯(lián) VREF - 輸入電壓（最大值）: 串聯(lián) VREF - 輸入電壓（最小值）: 分流電流（最大值）:60 mA 最大工作溫度:+ 125 C 封裝 / 箱體:SOT-23-3L 封裝:Reel |
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