参数资料
| 型号： | VRE205CA |
| 厂商： | Apex Microtechnology |
| 文件页数： | 3/4页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 5V 20-CLCC |
| 标准包装： | 1 |
| 基准类型： | 串联，精度 |
| 输出电压： | 5V |
| 容差： | ±800µV |
| 温度系数： | 1ppm/°C |
| 输入电压： | 13.5 V ~ 22 V |
| 通道数： | 1 |
| 电流 - 静态： | 7mA |
| 电流 - 输出： | 10mA |
| 工作温度： | -25°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-LCC |
| 供应商设备封装： | 20-CLCC |
| 包装： | 管件 |
VRE205
2. TYPICAL PERFORMANCE GRAPHS
V OUT vs. TEMPERATURE
Temperature o C
VRE205CA
QUIESCENT CURRENT VS. TEMP
Temperature o C
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
3. THEORY OF OPERATION
The following discussion refers to the schematic in Figure 1. A FET current source is used to bias a 6.3 V zener
diode. The zener voltage is divided by the resistor network R1 and R2. This voltage is then applied to the noninvert-
ing input of the operational amplifier which amplifies the voltage to produce a 5 V output. The gain is determined by
the resistor networks R3 and R4: G=1 + R4/R3. The 6.3 V 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’ volt-
age 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 tem-
perature ranges.
A nonlinear compensation network of thermistors and resistors is used in the VRE series voltage. This proprietary
network eliminates most of the nonlinearity in the voltage vs. temperature function. By then adjusting the slope, a
very stable voltage over wide temperature ranges is produced. This network is less than 2% of the overall network
resistance so it has a negligible effect on long term stability. By using highly stable resistors in our network, we pro-
duce a voltage reference that also has very good long term stability.
VRE205DS
3
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PDF描述 |
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| VRE305LS | IC VREF SERIES PREC 5V 8-SMT |
| VRE306AS-3 | IC VREF SERIES PREC 6V 8-SMT |
| VRE310JS | IC VREF SERIES PREC 10V 8-SMT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| VRE205M | 功能描述:基准电压& 基准电流 Ref. +5V, -55/125C 0.6mV error 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 |
| VRE205MA | 功能描述:基准电压& 基准电流 Ref. +5V, -55/125C 0.3mV error 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 |
| VRE205MF | 制造商:THC 功能描述:Voltage Reference, Fixed, 5V, 20 Pin, Ceramic, LCC |
| VRE210 | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:Precision Voltage Reference |
| VRE210_1 | 制造商:CIRRUS 制造商全称:Cirrus Logic 功能描述:Precision Voltage Reference |
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