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參數(shù)資料
| 型號： | VRE304C |
| 廠商： | CIRRUS LOGIC INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 4.5 V, PDSO8 |
| 封裝： | SMT-8 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 516K |
| 代理商： | VRE304C |
P r o d u c t I n n o v a t i o n F r o m
VRE304
VRE304DS
3
2.TYPICalPERFORMaNCECuRVES
Temperature oC
VRE304A
VOUT vs. TEMPERATURE
Temperature oC
VRE304C
QUIESCENT CURRENT VS. TEMP
Temperature oC
JUNCTION TEMP. RISE VS. OUTPUT CURRENT
Output Current (mA)
PSRR VS. FREQUENCY
Frequency (Hz)
3.ThEORYOFOPERaTION
The following discussion refers to the block diagram 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 4.5 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 references. This
proprietary network eliminates most of the nonlinearity in the voltage vs. temperature function. By adjusting the
slope, a very stable voltage is produced over wide temperature ranges.
This network is less than 2% of the overall network resistance so it has a negligible effect on long term stability.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VRE304CD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| VRE304CS | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Ref. +4.5V, 0/70C 2ppm 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 |
| VRE304J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low Cost Precision Reference |
| VRE304JD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| VRE304JS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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