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參數(shù)資料
| 型號(hào)： | ADR293ER |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Low Noise Micropower Precision Voltage Reference |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDSO8 |
| 封裝： | MS-012AA, SOIC-8 |
| 文件頁(yè)數(shù)： | 10/11頁(yè) |
| 文件大?。?/td> | 159K |
| 代理商： | ADR293ER |
ADR293
REV. 0
–10–
Kelvin Connections
In many portable instrumentation applications where PC board
cost and area go hand-in-hand, circuit interconnects are very often
of dimensionally minimum width. These narrow lines can cause
large voltage drops if the voltage reference is required to provide
load currents to various functions. In fact, a circuit’s interconnects
can exhibit a typical line resistance of 0.45 mW/square (1 oz. Cu,
for example). Force and sense connections also referred to as
Kelvin connections, offer a convenient method of eliminating the
effects of voltage drops in circuit wires. Load currents flowing
through wiring resistance produce an error (V
ERROR
= R
3
I
L
) at
the load. However, the Kelvin connection of Figure 22 overcomes
the problem by including the wiring resistance within the forcing
loop of the op amp. Since the op amp senses the load voltage, op
amp loop control forces the output to compensate for the wiring
error and to produce the correct voltage at the load.
ADR293
4
6
2
V
IN
GND
V
OUT
100k
V
R
LW
1
m
F
A
1
+V
SENSE
+V
FORCE
R
LW
V
IN
R
L
A
1
= 1/2 OP295
Figure 22. Advantage of Kelvin Connection
Voltage Regulator For Portable Equipment
The ADR293 is ideal for providing a stable, low cost and low
power reference voltage in portable equipment power supplies.
Figure 23 shows how the ADR293 can be used in a voltage
regulator that not only has low output noise (as compared to
switch mode design) and low power, but also a very fast recovery
after current surges. Some precautions should be taken in the
selection of the output capacitors. Too high an ESR (effective
series resistance) could endanger the stability of the circuit. A
solid tantalum capacitor, 16 V or higher, and an aluminum elec-
trolytic capacitor, 10 V or higher, are recommended for C1 and
C2, respectively. Also, the path from the ground side of C1 and
C2 to the ground side of R1 should be kept as short as possible.
2
3
6
7
2
4
4
V
IN
GND
ADR293
R1
402k
V
1%
R2
402k
V
1%
OP-20
+
+
C1
68
F
TANT
C2
1000
m
F
ELECT
+5V, 100mA
IRF9530
R3
510k
V
CINPUT
+
LBATTERY
6V
V
OUT
6
0.1
m
F
Figure 23. Voltage Regulator for Portable Equipment
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| ADR293ER-REEL | Low Noise Micropower Precision Voltage Reference |
| ADR293GBC | Low Noise Micropower Precision Voltage Reference |
| ADR318 | Precision Low Drift SOT-23 Voltage Reference with Shutdown |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADR293ER-REEL | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 5mA 8-Pin SOIC N T/R |
| ADR293ER-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Noise Micropower Precision Voltage Reference |
| ADR293ERZ | 功能描述:IC VREF SERIES PREC 5V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:XFET® 標(biāo)準(zhǔn)包裝:1,000 系列:- 基準(zhǔn)類型:旁路，可調(diào)節(jié)，精度 輸出電壓:2.495 V ~ 36 V 容差:±0.5% 溫度系數(shù):標(biāo)準(zhǔn)值 34ppm/°C 輸入電壓:2.495 V ~ 36 V 通道數(shù):1 電流 - 陰極:1mA 電流 - 靜態(tài):- 電流 - 輸出:100mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:TO-243AA 供應(yīng)商設(shè)備封裝:SOT-89-3 包裝:帶卷 (TR) |
| ADR293ERZ-REEL | 功能描述:IC VREF SERIES PREC 5V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電壓基準(zhǔn) 系列:XFET® 標(biāo)準(zhǔn)包裝:2,000 系列:- 基準(zhǔn)類型:旁路，可調(diào)節(jié)，精度 輸出電壓:1.24 V ~ 16 V 容差:±0.5% 溫度系數(shù):- 輸入電壓:1.24 V ~ 16 V 通道數(shù):1 電流 - 陰極:100µA 電流 - 靜態(tài):- 電流 - 輸出:20mA 工作溫度:-40°C ~ 85°C 安裝類型:通孔 封裝/外殼:TO-226-3、TO-92-3（TO-226AA）成形引線 供應(yīng)商設(shè)備封裝:TO-92-3 包裝:帶卷 (TR) |
| ADR293FR | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 5mA 8-Pin SOIC N Tube 制造商:Rochester Electronics LLC 功能描述:LOW NOISE, MICROPWR PRECISION VOLT. REF. - Bulk |
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