ADR02BR-REEL7 Analog Devices Inc, ADR02BR-REEL7 Datasheet - Page 15

• Manufacturer Part Number: ADR02BR-REEL7
• Description: IC VREF PREC 5V 10MA OUT 8-SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADR02BR-REEL7

• Rohs Status: RoHS non-compliant
• Design Resources: High Accuracy, Bipolar Voltage Output Digital-to-Analog Conversion Using AD5764 (CN0006) 4 mA to 20 mA Process Control Loop Using AD5662 (CN0009) 16-Bit Fully Isolated Voltage Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0063) 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using AD5662, ADuM1401, and External Amplifiers (CN0064)
• Reference Type: Series
• Voltage - Output: 5V
• Tolerance: ±0.06%
• Temperature Coefficient: 3ppm/°C
• Voltage - Input: 7 ~ 36 V
• Number Of Channels: 1
• Current - Quiescent: 1mA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Current - Cathode: -

APPLICATIONS INFORMATION
OVERVIEW
The ADR01/ADR02/ADR03/ADR06 are high precision, low
drift 10.0 V, 5.0 V, 2.5 V, and 3.0 V voltage references available
in an ultracompact footprint. The 8-lead SOIC versions of the
devices are drop-in replacements of the REF01/REF02/REF03
sockets with improved cost and performance.
These devices are standard band gap references (see Figure 34).
The band gap cell contains two NPN transistors (Q18 and Q19)
that differ in emitter area by 2×. The difference in their V
produces a proportional-to-absolute temperature current (PTAT)
in R14, and, when combined with the V
band gap voltage, V
With an internal op amp and the feedback network of R5 and
R6, V
ADR01, ADR02, ADR06, and ADR03, respectively. Precision
laser trimming of the resistors and other proprietary circuit
techniques are used to further enhance the initial accuracy,
temperature curvature, and drift performance of the ADR01/
ADR02/ADR03/ADR06.
The PTAT voltage is made available at the TEMP pin of the
ADR01/ADR02/ADR03/ADR06. It has a stable 1.96 mV/°C
temperature coefficient, such that users can estimate the
temperature change of the device by knowing the voltage
change at the TEMP pin.
APPLYING THE ADR01/ADR02/ADR03/ADR06
Input and Output Capacitors
Although the ADR01/ADR02/ADR03/ADR06 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 per-
formance 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 addi-
tional 0.1 μF ceramic capacitor should be connected in parallel
to reduce supply noise. Mount both input and output capacitors
as close to the device pins as possible.
Output Adjustment
The ADR01/ADR02/ADR03/ADR06 trim terminal can be used
to adjust the output voltage over a nominal voltage. This feature
allows a system designer to trim system errors by setting the
reference to a voltage other than 10.0 V/5.0 V/2.5 V/3.0 V. For
finer adjustment, add a series resistor of 470 kΩ. With the con-
figuration shown in Figure 35, the ADR01 can be adjusted from
9.70 V to 10.05 V, the ADR02 can be adjusted from 4.95 V to
5.02 V, the ADR06 can be adjusted from 2.8 V to 3.3 V, and the
O
is set precisely at 10.0 V, 5.0 V, 2.5 V, and 3.0 V for the
BG
, that is almost constant in temperature.
BE
of Q19, produces a
BE
Rev. O | Page 15 of 20
ADR03 can be adjusted from 2.3 V to 2.8 V. Adjustment of the
output does not significantly affect the temperature performance
of the device, provided the temperature coefficients of the resis-
tors are relatively low.
Temperature Monitoring
As described at the end of the Overview section, the ADR01/
ADR02/ADR03/ADR06 provide a TEMP output (Pin 1 in Figure 1
and Pin 3 in Figure 2) that varies linearly with temperature.
This output can be used to monitor the temperature change in the
system. The voltage at V
and the temperature coefficient is approximately 1.96 mV/°C
(see Figure 36). A voltage change of 39.2 mV at the TEMP pin
corresponds to a 20°C change in temperature.
TEMP
R12
Q18
2×
R17
R14
R27
R32
R13
R11
V
D3
IN
V
IN
0.1µF
Figure 34. Simplified Schematic Diagram
1×
Q19
R1
Q1
C1
Figure 35. Optional Trim Adjustment
R24
Q14 Q15
ADR01/ADR02/ADR03/ADR06
Q16
Q12
Figure 33. Basic Configuration
V
TEMP TRIM
R2
ADR01/
ADR02/
ADR03/
ADR06
IN
TEMP
Q3
Q13
GND
Q2
U1
TEMP TRIM
V
V
is approximately 550 mV at 25°C,
ADR01/
ADR02/
ADR03/
ADR06
IN
OUT
R3
C1
GND
U1
Q7
Q4
V
D1
D2
OUT
R41
470kΩ
R1
Q8
Q20
Q17
C2
0.1µF
I1
R42
Q23
R2
1kΩ
POT
10kΩ
V
V
O
V
BG
Q9
O
R5
R6
Q10
R20
R4
GND
V
V
TRIM
IN
O