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| 型號： | REF01AJ/883C |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY8 |
| 封裝： | MO-002AK, METAL CAN, TO-99, 8 PIN |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 593K |
| 代理商： | REF01AJ/883C |
REF01/REF02/REF03
Rev. J | Page 16 of 20
APPLICATIONS INFORMATION
BASIC REFERENCE APPLICATION
Figure 38 shows the basic configuration for any REF0x device.
Input and output capacitance values can be tailored for
performance, provided they follow the guidelines described
in the Input and Output Capacitors section.
U1
REF01/
REF02/
REF03
VO
C2
0.1F
C1
0.1F
VIN
VOUT
TEMP TRIM
GND
38
00
37
5-
0
Figure 38. Basic Reference Application
NEGATIVE REFERENCE
A negative reference can be constructed without any external
resistors as shown in Figure 39. In this configuration, the
reference IC and op amp work together to force the voltage at
the –VREF node to the negative value of the reference’s nominal
output voltage. The inverting input of the op amp represents
a virtual ground, forcing the VOUT pin of the reference to
0 V(ground), and the reference works to maintain a constant
voltage across its VOUT and GND pins, forcing the GND pin
negative.
U2
+15V
–15V
V–
V+
OP1177
–VREF
U1
+5V TO +15V
39
REF01/
REF02/
REF03
VIN
VOUT
TEMP TRIM
GND
00
37
5-
0
Figure 39. Negative Reference
Note that any load on the –VREF node will have its current
sourced from, or sunk into, the output of the op amp. For this
reason, U2 should be implemented with a low offset, precision
op amp, with an output current rating that meets or exceeds the
current requirements of the load.
LOW COST CURRENT SOURCE
Unlike most references, the quiescent current of the REF0x
series remains constant with respect to the load current (refer to
Figure 22). As a result, a simple, low cost current source can be
constructed by configuring the reference as shown in Figure 40.
REF01/
REF02/
REF03
VOUT
GND
VIN
IIN
ISET = (VOUT – VL)/RSET
RSET
IQ ≈ 0.6mA
IL = ISET + IQ
VL
RL
00
37
5-
0
40
Figure 40. Simple Current Source
In this configuration, the current through the resistor RSET (ISET)
is equal to (VOUT VL)/RSET. IL is simply the sum of ISET and IQ.
However, since IQ typically varies from 0.55 mA to 0.65 mA,
this circuit should be limited to low precision, general-purpose
applications.
PRECISION CURRENT SOURCE WITH
ADJUSTABLE OUTPUT
A higher-precision current source can be implemented with the
circuit shown in Figure 41.
U2
+12V
–12V
W
B
A
U1
REF02
VIN
VOUT
TEMP TRIM
GND
V–
V+
OP1177
–5V TO VL
AD5201
0V TO (5V + VL)
+12V
RSET
1k
RL
IL
VL
1k
100k
00
37
5-
04
1
Figure 41. Programmable 0 mA to 5 mA Current Source
By adding a mechanical or digital potentiometer, this circuit
becomes an adjustable current source. If a digital potentiometer
is used, the load current is simply the voltage across terminal B
to terminal W of the digital potentiometer divided by the value
of the resistor RSET.
[]
A
SET
REF
L
R
D
V
I
×
=
where D is the decimal equivalent of the digital potentiometer
input code.
A dual-supply op amp should be used since the ground
potential of REF02 can swing from 5.0 V to VL while the
potentiometer is swung from zero-scale to full-scale.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REF01AP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-+10V PRECISION REF |
| REF01AQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| REF01AU | 制造商:Texas Instruments 功能描述: |
| REF01AZ | 制造商:Maxim Integrated Products 功能描述:8 PINS CDIP PKG - Bulk 制造商:Rochester Electronics LLC 功能描述:+10V PRECISION VOLTAGE RE - Bulk 制造商:Analog Devices 功能描述:SEMICONDUCTOR ((NS)) |
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