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參數(shù)資料
| 型號： | REF200 |
| 英文描述： | DUAL CURRENT SOURCE/CURRENT SINK |
| 中文描述： | 雙路電流源/電流源 |
| 文件頁數(shù)： | 5/15頁 |
| 文件大小： | 250K |
| 代理商： | REF200 |
REF200
5
FIGURE 1. Simplified Circuit Diagram.
(Substrate)
Current
Source
(1 of 2)
4k
8X
8,7
5k
1k
1,2
6
3
5
4
1k
12k
Current
Mirror
APPLICATIONS INFORMATION
The three circuit sections of the REF200 are electrically
isolated from one another using a dielectrically isolated
fabrication process. A substrate connection is provided (pin
6), which is isolated from all circuitry. This pin should be
connected to a defined circuit potential to assure rated DC
performance. The preferred connection is to the most nega-
tive constant potential in your system. In most analog
systems this would be –V
. For best AC performance, leave
pin 6 open and leave unused sections unconnected.
Drift performance is specified by the “box method,” as
illustrated in the Current vs Temperature plot of the typical
performance curves. The upper and lower current extremes
measured over temperature define the top and bottom of the
box. The sides are determined by the specified temperature
range of the device. The drift of the unit is the slope of the
diagonal—typically 25ppm/
°
C from –25
°
C to +85
°
C.
If the current sources are subjected to reverse voltage, a
protection diode may be required. A reverse voltage circuit
model of the REF200 is shown in the Reverse Current vs
Reverse Voltage curve. If reverse voltage is limited to less
than 6V
or
reverse current is limited to less than 350
μ
A, no
protection circuitry is required. A parallel diode (Figure 2a)
will protect the device by limiting the reverse voltage across
the current source to approximately 0.7V. In some applica-
tions, a series diode may be preferable (Figure 2b) because
it allows no reverse current. This will, however, reduce the
compliance voltage range by one diode drop.
Applications for the REF200 are limitless. Application Bul-
letin AB-165 shows additional REF200 circuits as well as
other related current source techniques. A collection of
circuits is shown to illustrate some techniques. Also, see
AB-165A.
FIGURE 2. Reverse Voltage Protection.
100μA
Bidirectional
Current Source
D
4
D
2
D
D
3
1
D
2
D
1
100μA
100μA
NOTE: All diodes = 1N4148.
Bidirectional
Current Source
(a)
(b)
(c)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| REF200AP | DUAL CURRENT SOURCE/CURRENT SINK |
| REF200AU | DUAL CURRENT SOURCE/CURRENT SINK |
| REF2912AIDBZRG4 | 100ppm/∑C, 50レA in SOT23-3 CMOS VOLTAGE REFERENCE |
| REF2912AIDBZTG4 | 100ppm/∑C, 50レA in SOT23-3 CMOS VOLTAGE REFERENCE |
| REF2920AIDBZRG4 | 100ppm/∑C, 50レA in SOT23-3 CMOS VOLTAGE REFERENCE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF200_07 | 制造商:BB 制造商全稱:BB 功能描述:DUAL CURRENT SOURCE/CURRENT SINK |
| REF200AM-BI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Current Mirror |
| REF200AP | 制造商: 功能描述: 制造商:undefined 功能描述: |
| REF200AP-BI | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Current Mirror |
| REF200AU | 功能描述:基準(zhǔn)電壓& 基準(zhǔn)電流 Dual Current Source Current Sink 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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