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ADR01BR Datasheet(PDF) 16 Page - Analog Devices

Part No. ADR01BR
Description  Ultracompact Precision10 V/5 V/2.5 V/3.0 V Voltage References
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADR01BR Datasheet(HTML) 16 Page - Analog Devices

 
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ADR01/ADR02/ADR03/ADR06
Rev. F | Page 16 of 20
125
25
50
75
100
0.40
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
–25
0
–50
VIN = 15V
SAMPLE SIZE = 5
TEMPERATURE (
oC)
∆V
TEMP/∆T
1.96mV/
oC
Figure 37. Voltage at TEMP Pin vs. Temperature
The TEMP function is provided as a convenience rather than a
precise feature. Because the voltage at the TEMP node is
acquired from the band gap core, current pulling from this pin
has a significant effect on VOUT. Care must be taken to buffer the
TEMP output with a suitable low bias current op amp, such as
the AD8601, AD820, or OP1177, all of which would result in
less than a 100 µV change in ∆VOUT (see Figure 38). Without
buffering, even tens of microamps drawn from the TEMP pin
can cause VOUT to fall out of specification.
U2
15V
U1
ADR01/
ADR02/
ADR03/
ADR06
VIN
VOUT
TEMP TRIM
GND
VO
V–
V+
OP1177
VTEMP
1.9mV/
oC
VIN
Figure 38. Temperature Monitoring
NEGATIVE REFERENCE
Without using any matching resistors, a negative reference can
be configured as shown in Figure 39. For the ADR01, the volt-
age difference between VOUT and GND is 10 V. Because VOUT is
at virtual ground, U2 closes the loop by forcing the GND pin to
be the negative reference node. U2 should be a precision op
amp with a low offset voltage characteristic.
U2
+15V
–15V
V–
V+
OP1177
–VREF
U1
ADR01/
ADR02/
ADR03/
ADR06
VIN
VOUT
TEMP TRIM
GND
5V TO 15V
Figure 39. Negative Reference
LOW COST CURRENT SOURCE
Unlike most references, the ADR01/ADR02/ADR03/ADR06
employ an NPN Darlington in which the quiescent current
remains constant with respect to the load current, as shown in
Figure 24. As a result, a current source can be configured as
shown in Figure 40 where ISET = (VOUT – VL)/RSET. IL is simply
the sum of ISET and IQ. Although simple, IQ varies typically from
0.55 to 0.65 mA, limiting this circuit to general-purpose
applications.
ADR01/
ADR02/
ADR03/
ADR06
VOUT
GND
VIN
IIN
ISET = 10V/RSET
RSET
IQ 0.6mA
IL = ISET + IQ
VL
RL
Figure 40. Low Cost Current Source
PRECISION CURRENT SOURCE WITH
ADJUSTABLE OUTPUT
A precision current source, on the other hand, can be
implemented with the circuit shown in Figure 41. 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 terminals B to W of the
digital potentiometer divided by RSET.
SET
REF
L
R
D
V
I
×
=
(1)
where D is the decimal equivalent of the digital potentiometer
input code.
U2
+12V
–12V
W
B
A
U1
ADR01/
ADR02/
ADR03/
ADR06
VIN
VOUT
TEMP TRIM
GND
V–
V+
OP1177
–5V TO VL
AD5201
0V TO (5V + VL)
+12V
RSET
1k
RL
IL
VL
1k
100k
Figure 41. Programmable 0 to 5 mA Current Source


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