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参数资料
| 型号： | ADR318ARJ-R2 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 1.8V SOT23-5 |
| 标准包装： | 1 |
| 基准类型： | 串联，精度 |
| 输出电压： | 1.8V |
| 容差： | ±0.27% |
| 温度系数： | 25ppm/°C |
| 输入电压： | 2.4 V ~ 15 V |
| 通道数： | 1 |
| 电流 - 静态： | 140µA |
| 电流 - 输出： | 5mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | ADR318ARJ-R2DKR |
ADR318
APPLICATIONS
BASIC VOLTAGE REFERENCE CONNECTION
The circuit in Figure 18 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 μF to 10 μF. However, a 0.1 μF ceramic output capacitor
is recommended to absorb and deliver the charge as is required
by a dynamic load.
ADR318
GENERAL-PURPOSE CURRENT SOURCE
Many times in low power applications, the need arises for a
precision current source that can operate on low supply
voltages. As shown in Figure 2 0 , the ADR318 can be configured
as a precision current source. The illustrated circuit
configuration is a floating current source with a grounded load.
The reference output voltage is bootstrapped across R1 that sets
the output current into the load. With this configuration, circuit
precision is maintained for load currents in the range of the
SHUTDOWN
SHDN
GND
reference supply current, typically 90 mA, to approximately 5 mA.
INPUT
C I
0.1μF
V IN
V OUT(S)
V OUT(F)
The supply current is a function of I SET and increases slightly at
a given I SET .
+V DD
OUTPUT
C O
0.1μF
V IN
U1
ADR318
Figure 18. Voltage Reference Connection
PRECISION NEGATIVE VOLTAGE REFERENCE
SHDN
V OUT(F)
V OUT(S)
WITHOUT PRECISION RESISTORS
GND
R1
I SET
A negative reference can be easily generated by combining the
ADR318 with an op amp. Figure 19 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
0.1μF
I SY (I SET )
R L
I SY
ADJ
I OUT = I SET + I SV (I SET )
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 DD
V IN
ADR318
V OUT(F)
SHDN
V OUT(S)
GND
Figure 20. General-Purpose Current Source
HIGH POWER PERFORMANCE WITH CURRENT LIMIT
In some cases, the user may want higher output current
delivered to a load and still achieve better than 0.5% accuracy
out of the ADR318. The accuracy for a reference is normally
specified with no load (see the Specifications section). However,
the output voltage changes with the load current.
The circuit in Figure 21 provides high current without
compromising the accuracy of the ADR318. The power bipolar
–V SS
OP1177
–VREF
junction transistor (BJT) Q1 provides the required current, up
to 1 A. The ADR318 delivers the base drive to Q1 through the
force pin. The sense pin of the ADR318 is a regulated output
and is connected to the load.
Figure 19. Negative Reference
Rev. A | Page 10 of 12
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