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| 型号： | VRE306BD |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | THREE TERM VOLTAGE REFERENCE, PDIP8 |
| 文件页数： | 4/5页 |
| 文件大小： | 137K |
| 代理商： | VRE306BD |
DISCUSSION OF PERFORMANCE
VRE306DS REV. A JUN 1997
THEORY OF OPERATION
The following discussion refers to the schematic in
figure 2 below. A FET current source is used to bias a
6.3V zener diode. The zener voltage is divided by the
resistor network R1 and R2. This voltage is then applied
to the noninverting input of the operational amplifier which
amplifies the voltage to produce a 6.000V output. The
gain is determined by the resistor networks R3 and R4:
G=1 + R4/R3. The 6.3V zener diode is used because it is
the most stable diode over time and temperature.
The current source provides a closely regulated zener current,
which determines the slope of the references’ voltage vs.
temperature function. By trimming the zener current a lower
drift over temperature can be achieved. But since the voltage vs.
temperature function is nonlinear this compensation technique
is not well suited for wide temperature ranges.
Thaler Corporation has developed a nonlinear compensation
network of thermistors and resistors that is used in the VRE
series voltage references. This proprietary network eliminates
most of the nonlinearity in the voltage vs. temperature function.
By adjusting the slope, Thaler Corporation produces a very
stable voltage over wide temperature ranges.
VRE306
FIGURE 2
This network is less than 2% of the overall network resistance
so it has a negligible effect on long term stability.
Figure 3 shows the proper connection of the VRE306 series
voltage references with the optional trim resistor for initial error
and the optional capacitor for noise reduction. The VRE306
reference has the ground terminal brought out on two pins (pin
4 and pin 7) which are connected together internally. This
allows the user to achieve greater accuracy when using a socket.
Voltage references have a voltage drop across their power
supply ground pin due to quiescent current flowing through the
contact resistance. If the contact resistance was constant with
time and temperature, this voltage drop could be trimmed out.
When the reference is plugged into a socket, this source of error
can be as high as 20ppm. By connecting pin 4 to the power
supply ground and pin 7 to a high impedance ground point in
the measurement circuit, the error due to the contact resistance
can be eliminated. If the unit is soldered into place, the contact
resistance is sufficiently small that it does not effect
performance. Pay careful attention to the circuit layout to avoid
noise pickup and voltage drops in the lines.
EXTERNAL CONNECTIONS
FIGURE 3
8
4
6
5
+ V
OUT
2
+ V
IN
VRE306
10k
C
N
1F
OPTIONAL
NOISE REDUCTION
CAPACITOR
OPTIONAL
FINE TRIM
ADJUSTMENT
3
V TEMP OUT
7
REF. GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| VRE306BS | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| VRE306C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Cost Precision Reference |
| VRE306CD | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| VRE306CS | 功能描述:基准电压& 基准电流 Ref. +6V, 0/70C 2ppm 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 |
| VRE306J | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Low Cost Precision Reference |
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