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参数资料
| 型号： | REF3212AIDBVTG4 |
| 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, 1.25 V, PDSO6 |
| 封装： | GREEN, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 17/18页 |
| 文件大小： | 537K |
| 代理商： | REF3212AIDBVTG4 |
REF3212,REF3220
REF3225,REF3230
REF3233,REF3240
SBVS058B JUNE 2005 REVISED FEBRUARY 2006
www.ti.com
8
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, ILOAD = 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
u
tp
ut
V
o
lt
a
g
e
S
ta
bi
li
ty
(pp
m)
0400
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 Q1 and Q2 are biased so that the
current density of Q1 is greater than that of Q2. The
difference of the two base-emitter voltages (Vbe1 – Vbe2)
has a positive temperature coefficient and is forced across
resistor R1. This voltage is amplified and added to the
base-emitter voltage of Q2, 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
F is recommended.
1
2
3
6
5
4
+2.5V
0.47
F
+5V
R
32C
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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| REF3212AMDBVREP | 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 |
| REF3212AMDBVREPG4 | 功能描述:基准电压& 基准电流 EP 4Ppm/Degrees 100 Ua Series 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 |
| REF3212-EP | 制造商:TI 制造商全称:Texas Instruments 功能描述:4 ppm100 A SOT23-6 SERIES VOLTAGE REFERENCES |
| REF3220 | 制造商:BB 制造商全称:BB 功能描述:4ppm/C, 100UA, SOT23-6 SERIES VOLTAGE REFERENCE |
| REF3220AIDBVR | 功能描述:基准电压& 基准电流 2.048V 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 |
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