REF02CP Analog Devices Inc, REF02CP Datasheet - Page 14

• Manufacturer Part Number: REF02CP
• Description: IC VOLT REFERENCE PREC 5V 8DIP
• Manufacturer: Analog Devices Inc

Specifications of REF02CP

• 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
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Reference Volt Tolerance ±%: 0.45%
• Operating Temperature Max: 85°C
• Peak Reflow Compatible (260 C): No
• Output Voltage: 5V
• Current Rating: 1.4mA
• Output Voltage Max: 5V
• Leaded Process Compatible: No
• Features: 1.4mA
• 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: Through Hole
• Pin Count: 8
• Package Type: PDIP
• Current - Cathode: -
• Lead Free Status / Rohs Status: Not Compliant

REF01/REF02/REF03
THEORY OF OPERATION
REF01, REF02, and REF03 are high precision, low drift 10.0 V,
5.0 V, and 2.5 V voltage references available in a variety of
packages. These devices are standard band gap references (see
Figure 33). The band gap cell contains two NPN transistors
(Q18 and Q19) that differ in emitter area by a factor of 2. The
difference in the V
proportional-to-absolute temperature current (PTAT) through
R14, and, when combined with the V
gap voltage, V
With an internal op amp and the feedback network created by
R5 and R6, V
laser trimming of various resistors and other proprietary circuit
techniques are used to further enhance the initial accuracy,
temperature curvature, and drift performance of the device.
The PTAT voltage is brought out directly from the band gap,
unbuffered, at the TEMP pin. Since this voltage output has a
stable 1.96 mV/°C temperature coefficient, users can estimate
the temperature change of the device by simply monitoring the
change in voltage at this pin.
INPUT AND OUTPUT CAPACITORS
Figure 34 shows the basic input/output capacitor configuration
for the REF0x series of references.
TEMP
R12
Q18
2×
R17
R14
R27
R32
R13
R11
Figure 34. Basic REF0x Capacitor Configuration
D3
O
V
BG
IN
0.1µF
is set precisely at 10.0 V, 5.0 V, or 2.5 V. Precision
1×
Q19
R1
, that is almost constant over temperature.
Figure 33. REF0x Simplified Schematic
Q1
C1
R24
Q14 Q15
BE
Q16
Q12
values of these transistors produces a
R2
Q3
Q13
Q2
V
TEMP TRIM
IN
REF01/
REF02/
REF03
R3
C1
GND
Q7
U1
Q4
V
D1
D2
OUT
R41
BE
Q8
Q20
of Q19, produces a band
Q17
C2
0.1µF
I1
R42
Q23
V
V
O
BG
Q9
R5
R6
Q10
R20
R4
GND
TRIM
V
V
IN
O
Rev. K | Page 14 of 20
While the REF0x series of references are designed to function
stably without any external components, connecting a 0.1 μF
ceramic capacitor to the output is highly recommended to
improve stability and filter out low level voltage noise. An
additional 1 μF to 10 μF electrolytic, tantalum, or ceramic
capacitor can be added in parallel to improve transient perfor-
mance in response to sudden changes in load current; however,
the designer should keep in mind that doing so increases the
turn-on time of the device.
A 1 μF to 10 μF electrolytic, tantalum, or ceramic capacitor
can also be connected to the input to improve transient
response in applications where the supply voltage may fluctuate.
An additional 0.1 μF ceramic capacitor should be connected in
parallel to reduce supply noise.
Both input and output capacitors should be mounted as close to
the device pins as possible.
OUTPUT ADJUSTMENT
The REF0x trim terminal can be used to adjust the output
up or down from the internally trimmed, nominal output
voltage. This feature allows the system designer to trim out
system errors due to changes in line and load conditions,
thermal hysteresis, output offset due to solder reflow, or other
error sources. The basic trim circuit configuration is shown
in Figure 35.
Table 7 also lists the range of output voltages obtainable from
each model in this configuration.
Table 7. Adjustment Range Using Trim Circuit
Model
REF01
REF02
REF03
Adjustment of the output does not significantly affect the
temperature performance of the reference itself, provided the
temperature coefficients of the resistors used are low.
V
IN
Figure 35. Optional Trim Adjustment Circuit
V
9.70 V
4.95 V
2.3 V
OUT
, Low Limit
V
TEMP TRIM
REF01/
REF02/
IN
REF03
GND
U1
V
OUT
470kΩ
R1
V
10.05 V
5.02 V
2.8 V
OUT
POT
10kΩ
R2
1kΩ
, High Limit
V
O