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參數(shù)資料
| 型號： | ADR02 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Ultracompact Precision10 V/5 V/2.5 V/3.0 V Voltage References |
| 中文描述： | 超小型Precision10第V / 5 V/2.5 V/3.0 V電壓參考 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 837K |
| 代理商： | ADR02 |
ADR01/ADR02/ADR03/ADR06
Rev. F | Page 16 of 20
0
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
V
= 15V
SAMPLE SIZE = 5
V
T
(
TEMPERATURE (
o
C)
V
TEMP
/
T
1.96mV/
o
C
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 V
OUT
. 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
V
OUT
(see Figure 38). Without
buffering, even tens of microamps drawn from the TEMP pin
can cause V
OUT
to fall out of specification.
U2
15V
U1
ADR01/
ADR02/
ADR03/
ADR06
V
IN
V
OUT
TEMP TRIM
GND
V
O
V–
V+
OP1177
V
1.9mV/
o
C
V
IN
0
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 V
OUT
and GND is 10 V. Because V
OUT
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
–V
REF
U1
ADR01/
ADR02/
ADR03/
ADR06
V
IN
V
OUT
TEMP TRIM
GND
5V TO 15V
0
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 I
SET
= (V
OUT
– V
L
)/R
SET
. I
L
is simply
the sum of I
SET
and I
Q
. Although simple, I
Q
varies typically from
0.55 to 0.65 mA, limiting this circuit to general-purpose
applications.
ADR01/
ADR02/
ADR03/
ADR06
V
OUT
GND
V
IN
I
IN
I
SET
= 10V/R
SET
R
SET
I
Q
0.6mA
I
L
= I
SET
+ I
Q
V
L
R
L
0
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 R
SET
.
SET
REF
R
L
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
V
IN
V
OUT
TEMP TRIM
GND
V–
V+
OP1177
–5V TO V
L
AD5201
100k
0V TO (5V + V
L
)
+12
V
R
SET
1k
R
L
I
L
V
L
1k
0
Figure 41. Programmable 0 to 5 mA Current Source
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