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| 型號： | AB-011 |
| 英文描述： | AB-011 - LOW POWER SUPPLY VOLTAGE OPERATION OF REF102 10.0V PRECISION VOLTAGE REFERENCE |
| 中文描述： | 抗體- 011 -低功耗供應(yīng)REF102 10.0V高精度電壓基準(zhǔn)電壓操作 |
| 文件頁數(shù)： | 2/5頁 |
| 文件大小： | 57K |
| 代理商： | AB-011 |
2
380k
380k
380k
21.1k
20k
2
3
8
1
5
6
V
3
V
2
INA117
4
INA105
25k
25k
25k
25k
4
2
7
7
5
6
1
V = V – V
0V > V
O
> –10V
Swap A
2
pins 2 and 3 for:
10V > V
O
> 0V
also;
((V+) – 5V) > V
O
> ((V–) + 3V)
V+
V–
3
R
1
R
2
R
4
R
5
R
3
V = (V–) + 3.3V
R
1
R
2
R
3
R
4
1N4684
3.3V
10k
A
1
A
2
FIGURE 2. Offsetting the INA117 Common-Mode Input Range with a Zener Reference.
Since the input voltage can swing to within 3V of the power
supply, the following relationships apply for the INA117:
V
R
= 20 [(V+) + |V–| – 6V]
V
L
= 20 [(V–) + 3V] – 19 V
X
V
H
= V
R
– V
L
Where
V
R
= total common-mode range [V]
V
L
= minimum common-mode signal [V]
V
H
= maximum common-mode signal [V]
V+, V– = positive, negative power supply [V]
|V–| = absolute value of the negative power supply [V]
V
X
= offset voltage (from ground) [V]
POWER
SUPPLY
COMMON-MODE INPUT RANGE (V)
V
X
= 0
(1)
V
X
= V–
(2)
–240 to +240
(4)
45 to 525
(4)
–180 to +180
48 to 408
(4)
–120 to +120
51 to 291
(4)
–60 to +60
54 to 174
V
X
= (V–) + 3.3
(3)
–18 to 462
(4)
–15 to 345
(4)
–12 to 228
(4)
–9 to 111
±
15V
±
12V
±
9V
±
6V
NOTES: (1) Reference connected to GND (normal operation). (2) Refer-
ence connected to V– (see Figure 1). (3) Reference connected to V–
through 3.3V zener (see Figure 2). (4) Voltages greater than
±
200V are
shown for reference only. INA117 maximum rated operating voltage is
±
200V.
TABLE I. INA117 Common-Mode Input Range for Se-
lected Power Supplies and Reference Offsets.
The same principles can be applied to the INA105 difference
amplifier as shown in Figures 3 and 4. With an allowable
voltage swing to within 3V of the power supply, the following
relationships apply for the INA105:
V
R
= 2 [(V+) + |V–| – 6V]
V
L
= 2 [(V–) + 3V] – V
X
ADJUSTING THE COMMON
MODE RANGE DYNAMICALLY
Another way to boost the common-mode range of a differ-
ence amplifier is to drive the reference connection dy-
namically in response to changes in the input. A circuit to
boost the input range of the INA117 is shown in Figure 5.
A third amplifier, A
, along with resistors R
, R
, and R
is
used to derive, invert, and scale the input level presented to
the reference connection.
The value for R
depends on the power supply voltages and
op amp used for A
. To maximize the common-mode range,
R
should be selected so the output of A
is at its maximum
swing limit when the inputs to the difference amplifier op
amp are at 3V from the opposite power supply. The OPA1013
is a good choice for A
since its outputs are guaranteed to
swing within 2V of the power supply rails.
Using the OPA1013 op amp for A
, and considering the
allowed swing to within 3V of the power supply voltage, the
following relationships apply for the INA117.
V
CM
=
±
{20 ((V+) – 3V) – 19 V
X
}
V
X
= (V–) + 2V
R
6
= –0.5M
V
X
/V
CM
Where:
V
CM
= common-mode input range [V]
R
6
= value of R
6
[
]
POWER
SUPPLY (V)
V
CM
(V)
R
6
(k
)
±
15
±
12
±
9
±
6
±
487
(1)
±
370
(1)
±
253
(1)
±
136
13.3
13.7
13.7
14.7
NOTES: (1) Voltages above
±
200V are shown for reference only. INA117
maximum rated operating voltage is
±
200V.
TABLE II. INA117 Common-Mode Input Range for Se-
lected Power Supplies Using Figure 5 Circuit.
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