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参数资料
| 型号： | REF194GS-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 25/28页 |
| 文件大小： | 0K |
| 描述： | IC VREF SERIES PREC 4.5V 8-SOIC |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1,000 |
| 系列： | REF19 |
| 基准类型： | 串联，精度 |
| 输出电压： | 4.5V |
| 容差： | ±10mV |
| 温度系数： | 25ppm/°C |
| 输入电压： | 4.6 V ~ 15 V |
| 通道数： | 1 |
| 电流 - 静态： | 15µA |
| 电流 - 输出： | 30mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
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Data Sheet
+V BAT
REF19x Series
+V S
R1
1.1M ?
R3
10M ?
R6
100 ?
Q1
2N3904
C2
0.1μF
3
C1
2
U1
REF195
(SEE TABLE)
4
6
5.000V
3 +
7
6
0.1μF
R2
100k ?
2 –
4
U3
AD820
R4
900k ?
3
2
U2
REF195
(SEE TABLE)
4
6
+ C3
1μF
C4
R5
V S , V BAT
COMMON
0.1μF
100k ?
V OUT
COMMON
Figure 32. Fail-Safe 5 V Reference
For V S levels lower than the lower threshold, the output of U3 is
100 Ω
low, thus U2 and Q1 are off and U1 is on. For V S levels higher
than the upper threshold, the situation reverses, with U1 off and
2
REF195
6
10 μ F
1 μ F
both U2 and Q1 on. In the interest of battery power conserva-
tion, all of the comparison switching circuitry is powered from
V S and is arranged so that when V S fails, the default output
comes from U1.
10 μ F
+
4
+
57k Ω
1%
0.1 μ F
3 +
2 –
For the R1 to R3 values, as shown in Figure 32, lower/upper V S
switching thresholds are approximately 5.5 V and 6 V, respec-
tively. These can be changed to suit other V S supplies, as can the
REF19x devices used for U1 and U2, over a range of 2.5 V to
0.1 μ F
10k Ω
1%
4
1/4
OP492
11
1
2N2222
5 V of output. U3 can operate down to a V S of 3.3 V, which is
generally compatible with all REF19x family devices.
LOW POWER, STRAIN GAGE CIRCUIT
500 Ω
0.1%
As shown in Figure 33, the REF19x family of references can be
10k Ω
1%
0.01 μ F
used in conjunction with low supply voltage operational ampli-
fiers, such as the OP492 or the OP747, in a self-contained strain
gage circuit in which the REF195 is used as the core. Other
references can be easily accommodated by changing circuit
element values. The references play a dual role, first as the
voltage regulator to provide the supply voltage requirements of
2.21k Ω
13 –
1/4
OP492
12 +
10k Ω
1%
14
20k Ω
1%
20k Ω
1%
6 –
1/4
OP492
5 +
7
OUTPUT
the strain gage and the operational amplifiers, and second as a
precision voltage reference for the current source used to
stimulate the bridge. A distinct feature of the circuit is that it
can be remotely controlled on or off by digital means via
9 –
1/4
OP492
10 +
8
20k Ω
1%
20k Ω
1%
the SLEEP pin.
Rev. L | Page 25 of 28
Figure 33. Low Power, Strain Gage Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REF194GSZ | 功能描述:IC VREF SERIES PREC 4.5V 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:REF19 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:3V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:82µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-TSSOP（5 引线），SC-88A，SOT-353 供应商设备封装:SC-70-5 包装:带卷 (TR) 其它名称:296-20888-2 |
| REF194GSZ-REEL | 功能描述:IC VREF SERIES PREC 4.5V 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:REF19 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
| REF194GSZ-REEL7 | 功能描述:IC VREF SERIES PREC 4.5V 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电压基准 系列:REF19 标准包装:3,000 系列:- 基准类型:旁路，精度 输出电压:3V 容差:±0.5% 温度系数:100ppm/°C 输入电压:- 通道数:1 电流 - 阴极:82µA 电流 - 静态:- 电流 - 输出:15mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-TSSOP（5 引线），SC-88A，SOT-353 供应商设备封装:SC-70-5 包装:带卷 (TR) 其它名称:296-20888-2 |
| REF195 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Micropower, Low Dropout, Voltage References |
| REF1950008S | 制造商:Analog Devices 功能描述: |
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