REF02CJ データシートの表示（PDF） - Analog Devices
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REF02CJ Datasheet PDF : 16 Pages
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REF02
PRECISION CURRENT SOURCE
A current source with 35 V output compliance and excellent
output impedance can be obtained using this circuit. REF02
keeps the line voltage and power dissipation constant in the
device; the only important error consideration at room
temperature is the negative supply rejection of the op amp. The
typical 3 µV/V PSRR of the OP02E creates a 20 ppm change
(3 µV/V × 35 V/5 V) in output current over a 25 V range. For
example, a 5 mA current source can be built (R = 1 kΩ) with
350 MΩ output impedance.
35V
RO = 20 ×10–6 × 5mA
+50V
2
6
VIN
VO
REF02
2
VIN
6
VO
REF02
1
GND
4
2
GND
4
R
C
R
C
(TRIM FOR
CALIBRATION)
72
6 OP02E
3
4
–5V
VO = 0V
TO 25V
IO =
5V
R
Figure 22. Precision Current Source
15V
2
VIN VO 6
REF02
3 TEMP TRIM 5
GND
4
R
IOUT = +
5V
R
+ 1mA
VOLTAGE COMPLIANCE: –25V TO +8V
IOUT
Figure 23. Current Source
SUPPLY BYPASSING
For best results, it is recommended that the power supply pin be
bypassed with a 0.1 µF disc ceramic capacitor.
IOUT
2 VOLTAGE COMPLIANCE: –9V TO +25V
VIN VO 6
REF02
3 TEMP TRIM 5
R
IOUT = +
5V
R
+ 1mA
GND
4
–15V
Figure 24. Current Sink
5kΩ
+15V
MSB
LSB
5kΩ
+15V
0.1µF
2
VIN VO 6
5kΩ
B1 B2 B3 B4 B5 B6 B7 B8
lO
4
5
REF02
DAC08
lO 2
OP02
EO
V+
V– CC VLC
GND
5kΩ
4
+15V –15V
–15V
Figure 25. DAC Reference
+7.5V (±10%)
2
VIN VO 6
REF02HJ
R1
20kΩ
GND
4
R2
13.3kΩ
+7.5V
VO(+) = +3V
A1 1/2 OP04CK
–7.5V
–7.5V
1/2 OP04CK A2
R4
R3
2kΩ
1kΩ
VO(–) = –3V
–7.5V (±10%)
Figure 26. ±3 V Reference
Rev. I | Page 12 of 16
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