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參數資料
| 型號： | ADR1581BRTZ-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.25 V Micropower, Precision Shunt Voltage Reference |
| 中文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.25 V, PDSO3 |
| 封裝： | ROHS COMPLIANT, TO-236AB, SOT-23, 3 PIN |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 491K |
| 代理商： | ADR1581BRTZ-R2 |
ADR1581
Output turn-on time is modified when an external noise-reduction
filter is used. When present, the time constant of the filter dom-
inates the overall settling.
Rev. 0 | Page 9 of 12
Attempts to drive a large capacitive load (in excess of 1000 pF) may
result in ringing, as shown in the step response (see Figure 22). This
is due to the additional poles formed by the load capacitance and
the output impedance of the reference. A recommended method
of driving capacitive loads of this magnitude is shown in
A resistor isolates the capacitive load from the output stage,
whereas the capacitor provides a single-pole low-pass filter
and lowers the output noise.
0V
V
IN
2.4V
OUTPUT ERROR
1mV/DIV, 2μs/DIV
OUTPUT
0.5mV/DIV, 2ms/DIV
0
Figure 19.
1.8V
2.0V
V
IN
C
L
= 0.01μF
50μs/DIV
10mV/DIV
0
Figure 20. Turn-On Settling
TRANSIENT RESPONSE
Many ADCs and DACs present transient current loads to the
reference. Poor reference response can degrade the converter’s
performance.
Figure 22. Transient Response with Capacitive Load
Figure 21 displays both the coarse and fine settling characteristics
of the device to load transients of ±50 μA.
PRECISION MICROPOWER LOW DROPOUT
REFERENCE
The circuit in Figure 23 provides an ideal solution for creating
a stable voltage reference with low standby power consumption,
low input/output dropout capability, and minimum noise output.
The amplifier both buffers and optionally scales up the ADR1581
output voltage. Output voltages as high as 2.1 V can supply 1 mA of
load current. A one-pole filter connected between the ADR1581
and the OP193 input can be used to achieve low output noise. The
nominal quiescent power consumption is 250 μW.
1mV/DIV
20mV/DIV
1μs/DIV
1mV/DIV
20mV/DIV
(a)
(b)
I
R
= 150μA – 50μA STEP
I
R
= 150μA + 50μA STEP
0
3V
28.7k
ADR1581
OP193
V
OUT
= 1.250V
OR
V
OUT
= 1.250 (1 + R2/R3)
R3
R2
4.7μF
205
0
Figure 21. Transient Settling
Figure 21a shows the settling characteristics of the device for an
increased reverse current of 50 μA. Figure 21b shows the response
when the reverse current is decreased by 50 μA. The transients
settle to 1 mV in about 3 μs.
Figure 23. Micropower Buffered Reference
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADR1581BRTZ-R21 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.25 V Micropower, Precision Shunt Voltage Reference |
| ADR1581BRTZ-REEL7 | 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:- 產品培訓模塊:Voltage Reference Basics 標準包裝: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:50ppm/°C 輸入電壓:- 通道數:1 電流 - 陰極:1µA 電流 - 靜態:- 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） 供應商設備封裝:8-SOIC 包裝:管件 |
| ADR1581BRTZ-REEL71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:1.25 V Micropower, Precision Shunt Voltage Reference |
| ADR2 | 制造商:Thomas & Betts 功能描述:ADR2 EXTR ALUM LUG 制造商:Thomas & Betts 功能描述:EXTR ALUM LUG 制造商:Thomas & Betts 功能描述:Conn NEMA 1 POS Screw ST Cable Mount |
| ADR21 | 制造商:Thomas & Betts 功能描述:TERMINAL MECHANICAL LUG 5/8IN SCREW 制造商:Thomas & Betts 功能描述:TERMINAL, MECHANICAL LUG, 5/8IN, SCREW, 制造商:Thomas & Betts 功能描述:TERMINAL, MECHANICAL LUG, 5/8IN, SCREW, 14-2/0AWG; Connector Type:Lug, Mechanical; Series:Blackburn; Termination Method:Screw; Stud/Tab Size:0.625"; Wire Size AWG Min:14AWG; Wire Size AWG Max:00AWG; Contact Material:Aluminium ;RoHS Compliant: Yes 制造商:Thomas & Betts 功能描述:Conn NEMA 1 POS Screw ST Cable Mount |
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