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參數資料
| 型號： | ADR318 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Low Drift SOT-23 Voltage Reference with Shutdown |
| 中文描述： | 精密低漂移的SOT - 23電壓基準有關斷 |
| 文件頁數： | 7/8頁 |
| 文件大小： | 492K |
| 代理商： | ADR318 |
REV. 0
ADR318
–7–
APPLICATIONS
Basic Voltage Reference Connection
The circuit in Figure 2 illustrates the basic configuration for the
ADR318. Decoupling capacitors are not required for circuit stability.
The ADR318 is capable of driving capacitative loads from 0
μ
F to
10
μ
F. However, a 0.1
μ
F ceramic output capacitor is recommended
to absorb and deliver the charge as is required by a dynamic load.
SHUTDOWN
INPUT
SHDN
ADR318
GND
V
OUT(F)
V
OUT(S)
V
IN
C
I
0.1 F
C
O
OUTPUT
0.1 F
Figure 2. Voltage Reference Connection
Precision Negative Voltage Reference without Precision Resistors
A negative reference can be easily generated by combining the
ADR318 with an op amp. Figure 3 shows this simple negative
reference configuration. V
OUT(F)
and V
OUT(S)
are at virtual ground
and therefore the negative reference can be taken directly from
the output of the op amp. The op amp should be a dual-supply,
low offset, rail-to-rail amplifier, such as the OP1177.
V
OUT(S)
V
OUT(F)
ADR318
SHDN
+V
DD
GND
–VREF
V
IN
OP1177
–V
SS
Figure 3. Negative Reference
General-Purpose Current Source
Many times in low power applications, the need arises for a preci-
sion current source that can operate on low supply voltages. As
shown in Figure 4, the ADR318 can be configured as a precision
current source. The circuit configuration illustrated is a floating
current source with a grounded load. The reference’s output voltage
is bootstrapped across R1, which sets the output current into the
load. With this configuration, circuit precision is maintained for
load currents in the range from the reference’s supply current,
typically 90 mA to approximately 5 mA. The supply current is a
function of I
SET
and will increase slightly at a given I
SET
.
V
OUT(S)
I
SY
(I
SET
)
I
SET
V
OUT(F)
ADR318
+V
DD
GND
V
IN
U1
SHDN
0.1 F
R1
R
L
I
SY
ADJ
I
OUT
=
I
SET
+ I
SV
(I
SET
)
Figure 4. General-Purpose Current Source
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