REF02CS Analog Devices Inc, REF02CS Datasheet - Page 16

• Manufacturer Part Number: REF02CS
• Description: IC VOLT REFERENCE PREC 5V 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of REF02CS

• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Rohs Status: RoHS non-compliant
• Reference Type: Series
• Voltage - Output: 5V
• Tolerance: ±14%
• Temperature Coefficient: 65ppm/°C
• Voltage - Input: 7 ~ 40 V
• Number Of Channels: 1
• Current - Quiescent: 1.4mA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 85°C
• Peak Reflow Compatible (260 C): No
• Output Voltage: 5V
• Current Rating: 21A
• Output Voltage Max: 5V
• Leaded Process Compatible: No
• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 5V
• Reference Voltage Accuracy (max): 1
• Line Regulation: 150ppm/V
• Load Regulation: 150ppm/mA
• Input Voltage (max): 40V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Current - Cathode: -
• Lead Free Status / Rohs Status: Not Compliant

REF01/REF02/REF03
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.
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 39.
In this configuration, the current through the resistor R
is equal to (V
However, since I
this circuit should be limited to low precision, general-purpose
applications.
REF01/
REF02/
REF03
OUT
V
IN
0.1µF
GND
Figure 38. Basic Reference Application
V
Q
C1
− V
IN
typically varies from 0.55 mA to 0.65 mA,
Figure 39. Simple Current Source
I
Q
V
L
I
OUT
≈ 0.6mA
IN
)/R
SET
V
TEMP TRIM
R
. I
REF01/
REF02/
IN
REF03
SET
R
L
GND
L
U1
is simply the sum of I
V
OUT
V
L
I
I
SET
L
= I
= (V
SET
OUT
+ I
C2
0.1µF
Q
– V
V
O
L
)/R
SET
SET
and I
SET
(I
Q
SET
Rev. K | Page 16 of 20
.
)
PRECISION CURRENT SOURCE WITH ADJUSTABLE
OUTPUT
A higher-precision current source can be implemented with the
circuit shown in Figure 40.
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 R
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 V
potentiometer is swung from zero-scale to full-scale.
PRECISION BOOSTED OUTPUT REGULATOR
The output current sourcing capability of the REF0x series can
be boosted by using an external op amp and MOSFET, as shown
in Figure 41.
In this circuit, U2 forces V
through N1, thereby sourcing the load current directly from the
input voltage source connected at V
shown, this circuit can source up to 50 mA with an input volt-
age of 15.0 V. The circuit’s current sourcing capability can be
further increased by replacing N1 with a higher-power MOSFET.
V
IN
I
L
+12V
=
Figure 40. Programmable 0 mA to 5 mA Current Source
V
V
TEMP TRIM
IN
REF01/
REF02/
REF03
REF
R
Figure 41. Precision Boosted Output Regulator
GND
SET
U1
×
SET
V
V
TEMP TRIM
OUT
D
IN
.
REF02
GND
[ ]
U1
–5V TO V
A
V
OUT
OP1177
O
L
AD5201
0V TO (5V + V
to V
15V
U2
OP1177
V+
V–
100kΩ
–12V
+12V
2N7002
V+
V–
U2
REF
B
A
1000pF
by regulating the current
IN
W
100Ω
. Using the components
L
C
N1
R
)
1
1
R
SET
R
L
R
100Ω
2
L
200Ω
R
1kΩ
1kΩ
while the
L
V
L
I
L
C
1µF
L
V
O