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參數(shù)資料
| 型號： | ADR293GR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準電壓源/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 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大小： | 159K |
| 代理商： | ADR293GR |
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
相關PDF資料 |
PDF描述 |
|---|---|
| ADR293ER | Low Noise Micropower Precision Voltage Reference |
| ADR293FR | Low Noise Micropower Precision Voltage Reference |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADR293GR-REEL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| ADR293GR-REEL7 | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 5mA 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:LOW NOISE, MICROPWR PRECISION VOLT. REF. - Tape and Reel |
| ADR293GRU | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 5mA 8-Pin TSSOP Tube 制造商:Rochester Electronics LLC 功能描述:LOW NOISE, MICROPWR PRECISION VOLT. REF. - Bulk |
| ADR293GRU-REEL | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 5mA 8-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:LOW NOISE, MICROPWR PRECISION VOLT. REF. - Tape and Reel |
| ADR293GRU-REEL7 | 制造商:Analog Devices 功能描述:V-Ref Precision 5V 5mA 8-Pin TSSOP T/R 制造商:Rochester Electronics LLC 功能描述:LOW NOISE, MICROPWR PRECISION VOLT. REF. - Tape and Reel |
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