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| 型號： | ADR1500BKSZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.2875 V Micropower, Shunt Voltage Reference |
| 中文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.2875 V, DSO3 |
| 封裝： | SMD, SC70-3 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 190K |
| 代理商： | ADR1500BKSZ-REEL |
ADR1500
THEORY OF OPERATION
The ADR1500 uses the band gap concept to produce a stable
voltage reference suitable for high accuracy data acquisition
components and systems. This device makes use of the underlying
physical nature of the silicon transistor base emitter voltage in
the forward-biased operating region. All such transistors have
an approximate 2 mV/°C temperature coefficient, which is not
suitable for use as a low TC reference; however, extrapolation of
the temperature characteristic of any one of these devices to
absolute zero (with collector current proportional to absolute
temperature) reveals that V
BE
goes to approximately the silicon
band gap voltage. Therefore, if a voltage could be developed
with an opposing temperature coefficient to the sum with the
V
BE
, than a zero TC reference would result. The ADR1500
circuit in Figure 7 provides such a compensating voltage, V1,
by deriving two transistors at different current densities and
amplifying the resultant V
BE
difference (ΔV
BE
, which has a
positive TC). The sum of the V
BE
and V1 provides a stable
voltage reference.
Rev. 0 | Page 6 of 8
0
V+
V–
+
Δ
V
BE
–
V
BE
–
+
V1
+
–
Figure 7. Schematic Diagram
APPLYING THE ADR1500
The ADR1500 is simple to use in virtually all applications. To
operate the ADR1500 as a conventional shunt reference, see
Figure 8. An external series resistor is connected between the
supply voltage and the ADR1500.
For a given supply voltage, the series resistor, R
S
, determines the
reverse current flowing through the ADR1500. The value of R
S
must be chosen to accommodate the expected variations of the
supply voltage, V
S
, load current, I
L
, and the ADR1500 reverse
voltage, V
R
, while maintaining an acceptable reverse current, I
R
,
through the ADR1500.
The minimum value for R
S
should be enough to limit I
R
to
10 mA when V
S
is at its maximum, and I
L
and V
R
are at their
minimum. The equation for selecting R
S
is
)
(
R
S
S
I
I
+
)
(
L
R
V
V
R
=
0
(A)
R
S
V
S
V
R
I
R
+ I
L
I
L
V
OUT
I
R
+
–
(B)
R
S
+5V (+3V) ±10%
V
R
2.94k
(1.30k
)
V
OUT
+
–
Figure 8. Typical Connection Diagram
Figure 8 shows a typical connection of the ADR1500 operating
at a minimum of 100 μA. This connection can provide ±1 mA
to the load, while accommodating ±10% power supply
variations.
TURN-ON TIME
The turn-on time is a critical parameter for applications
demanding a large amount of processing. Figure 9 shows
the turn-on characteristics of the ADR1500.
0
250mV/DIV
5μs/DIV
2.4V
0V
V
IN
C
L
= 200pF
Figure 9. Response Time
Upon application of power (cold start), the time required for
the output voltage to reach its final value within a specified
error is the turn-on settling time. Tow components are normally
associated with the time for active circuits to settle and the time
for the thermal gradients on the chip to stabilize. This characteristic
is generated from cold start operation and represents the true
turn-on waveform after power up. Figure 10 shows both the
course and fine turn-on settling characteristics of the device;
the total settling time to within 1.0 mV is about 6 μs, and there
is no long thermal tail when the horizontal scale is expanded to
2 μs/DIV. The output turn-on time is modified when an
external noise reduction filter is used. When present, the time
constant of the filter dominates the overall settling.
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參數(shù)描述 |
|---|---|
| ADR1500BKSZ-REEL7 | 功能描述:IC VREF SHUNT PREC 1.2875V SC-70 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 產(chǎn)品培訓(xùn)模塊:Voltage Reference Basics 標(biāo)準包裝:100 系列:- 基準類型:旁路，精度 輸出電壓:4.096V 容差:±0.075% 溫度系數(shù):50ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:1µA 電流 - 靜態(tài):- 電流 - 輸出:10mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:管件 |
| ADR1581 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.25 V Micropower, Precision Shunt Voltage Reference |
| ADR1581ARTZ-R2 | 功能描述:IC VREF SHUNT PREC 1.25V SOT23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準 系列:- 產(chǎn)品培訓(xùn)模塊:Voltage Reference Basics 標(biāo)準包裝:100 系列:- 基準類型:旁路，精度 輸出電壓:4.096V 容差:±0.075% 溫度系數(shù):50ppm/°C 輸入電壓:- 通道數(shù):1 電流 - 陰極:1µA 電流 - 靜態(tài):- 電流 - 輸出:10mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:管件 |
| ADR1581ARTZ-R21 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.25 V Micropower, Precision Shunt Voltage Reference |
| ADR1581ARTZ-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.25 V Micropower, Precision Shunt Voltage Reference |
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