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参数资料
| 型号： | LT1787IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP PREC CURRENT SENSE 8SOIC |
| 标准包装： | 2,500 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| 电压 - 输入偏移： | 40µV |
| 电流 - 电源： | 60µA |
| 电流 - 输出 / 通道： | 50µA |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 36 V，±1.25 V ~ 18 V |
| 工作温度： | -40°C ~ 125°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) |
12
LT1787/LT1787HV
1787fc
Operation with A/D Converter
Figure 6 shows the LT1787 operating with the LTC1286
A/D converter. This low cost circuit is capable of 12-bit
resolution of unipolar currents. The – IN pin of the A/D
converter is biased at 1V by the resistor divider R1 and R2.
This voltage increases as sense current increases, with the
amplified sense voltage appearing between the A/D con-
verters –IN and +IN terminals. The front page of the data
sheet shows a similar circuit which uses a voltage refer-
ence for improved accuracy and signal range. The LTC1286
converter uses sequential sampling of its –IN and +IN
inputs. Accuracy is degraded if the inputs move between
sampling intervals. A filter capacitor from FIL+ to FIL– as
well as a filter capacitor from VBIAS to VOUT may be
necessary if the sensed current changes more than 1LSB
within a conversion cycle.
Buffered Output Operation
Figure 7 shows the LT1787’s outputs buffered by an
operational amplifier configured as an I/V converter. This
configuration is ideal for monitoring very low voltage
supplies. The LT1787’s VOUT pin is held equal to the
reference voltage appearing at the op amp’s noninverting
input. This allows monitoring VS supplies as low as 2.5V.
The op amp’s output may swing from ground to its positive
supply voltage. The low impedance output of the op amp
may drive following circuitry more effectively than the high
output impedance of the LT1787. The I/V converter configu-
ration also works well with split supply voltages.
Single Supply Unidirectional Operation
Figure 8 shows the simplest connection in which the
LT1787 may be used. The VBIAS pin is connected to
ground, and the VOUT pin swings positive with increasing
sense current. The LT1787’s outputs can swing as low as
30mV as shown in Figure 9. Accuracy is sacrificed at small
output levels, but this is not a limitation in protection
circuit applications or where sensed currents do not vary
greatly. Increased low level accuracy can be obtained by
level shifting VBIAS above ground. The level shifting may be
done with resistor dividers, voltage references or a simple
diode. Accuracy is ensured if the output signal is sensed
differentially between VBIAS and VOUT.
APPLICATIONS INFORMATION
WU
U
Figure 8. Unidirectional Current Sensing Mode
1787 F08
C
0.1
F
RSENSE
2.5V TO
60V
VOUT
TO
LOAD
1
2
3
4
8
7
6
5
LT1787HV
FIL+
FIL–
VBIAS
VOUT
VS
–
VS
+
DNC
VEE
ROUT
Figure 7. Single Supply 2.5V Bidirectional Operation
with External Voltage Reference and I/V Converter
2.5V
C1
1
F
RSENSE
ISENSE
2.5V + VSENSE(MAX)
TO
CHARGER/
LOAD
VOUT A
1M
5%
1787 F07
LT1495
C3
1000pF
LT1389-1.25
2.5V
+
–
A1
1
2
3
4
8
7
6
5
LT1787
FIL+
FIL–
VBIAS
VOUT
VS
–
VS
+
DNC
VEE
ROUT
Figure 6. Unidirectional Output into A/D
with Fixed Supply at VS+
R2
5k
5%
1787 F06
IOUT
C1
1
F
5V
VREF
VCC
GND
LTC1286
CS
CLK
DOUT
+IN
–IN
TO
P
RSENSE
5V
1
2
3
4
8
7
6
5
LT1787
FIL+
FIL–
VBIAS
VOUT
VS
–
VS
+
DNC
VEE
R1
20k
5%
ROUT
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相关代理商/技术参数 |
参数描述 |
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| LT1789-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers |
| LT1789-1_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers |
| LT1789-10 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers |
| LT1789CS8-1 | 功能描述:IC INSTRUMENT AMP R-R OUT 8-SOIC RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 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-SOIC 包装:带卷 (TR) |
| LT1789CS8-1#PBF | 功能描述:IC INSTRUMENT AMP R-R OUT 8-SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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