REF01HS Analog Devices, REF01HS Datasheet - Page 8

• Manufacturer Part Number: REF01HS
• Description: 10 V Precision Voltage Reference
• Manufacturer: Analog Devices

REF01
PRECISION CURRENT SOURCE
A current source with 25 V output compliance and excellent
output impedance can be obtained using this circuit. REF01
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 V/
V PSRR of the OP02E will create an 8 ppm change (3 V/V
25 V/10 V) in output current over a 25 V range. For example, a
10 mA current source can be built (R = 1 k ) with 300 M
output impedance.
SUPPLY BYPASSING
For best results, it is recommended that the power supply pin is
bypassed with a 0.1 F disc ceramic capacitor.
REF01
GND
V
IN
RC = 10
2
4
V
O
Figure 10. Precision Current Source
6
–5
SEC
R
C
R
6
6
O
V
O
REF01
OP02E
+50V
GND
4
–5V
V
8 10
IN
2
7
4
2
3
25
6
V
10
mA
C
R
(TRIM FOR
CALIBRATION)
I
O
= +10V
R
V
TO +25V
O
= 0
–8–
REFERENCE STACK WITH EXCELLENT LINE
REGULATION
Three REF01s can be stacked to yield 10.000 V, 20.000 V, and
30.000 V outputs. An additional advantage is near-perfect line
regulation of the 10.0 V and 20.0 V output. A 32 V to 60 V
input change produces an output change that is less than the
noise voltage of the devices. A load bypass resistor (RB) provides
a path for the supply current (I
In general, any number of REF01s can be stacked this way. For
example, 10 devices will yield outputs of 10, 20, 30 . . . 100 V.
The line voltage can change from 105 V to 130 V. However,
care must be taken to ensure that the total load currents do not
exceed the maximum usable current (typically 21 mA).
32V TO 60V
REF01
REF01
GND
GND
V
V
IN
IN
2
TRIM
4
2
4
TRIM
V
V
O
O
6
5
6
5
Figure 11. Reference Stack
REF01
SY
GND
V
) of the 20.000 V regulator.
IN
TRIM
2
4
10k
V
O
5
6
TRIMMED
OUTPUTS
10k
10k
R
6.8k
B
20.000V
30.000V
10.000V
REV. C