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LT1366CS8-TR 参数 Datasheet PDF下载

LT1366CS8-TR图片预览
型号: LT1366CS8-TR
PDF下载: 下载PDF文件 查看货源
内容描述: [Dual and Quad Precision Rail-to-Rail Input and Output Op Amps]
分类和应用:
文件页数/大小: 20 页 / 392 K
品牌: Linear [ Linear ]
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LT1366/LT1367  
LT1368/LT1369  
applicaTions inForMaTion  
Improved Supply Rejection in the LT1368/LT1369  
Figure4showstheoutputsoftheLT1366/LT1368perturbed  
by a 200mV 50kHz square wave added to the positive  
P-P  
The LT1368/LT1369 are variations of the LT1366/LT1367  
offering greater supply rejection and lower high frequency  
outputimpedance.TheLT1368/LT1369requirea0.1µFload  
capacitance for compensation. The output capacitance  
forms a filter, which reduces pickup from the supply and  
lowers the output impedance. This additional filtering is  
helpfulinmixedanalog/digitalsystemswithcommonsup-  
plies, or systems employing switching supplies. Filtering  
alsoreduceshighfrequencynoise,whichmaybebeneficial  
when driving A/D converters.  
supply. The LT1368’s power supply rejection is about ten  
times greater than that of the LT1366 at 50kHz. Note the  
5-to-1 scale change in the output voltage traces.  
The tolerance of the external compensation capacitor is  
not critical. The plots of Overshoot vs Load Current in the  
Typical Performance Characteristics section illustrate the  
effect of a capacitive load.  
+
+
V
(AC)  
V
(AC)  
100mV/DIV  
100mV/DIV  
V
V
OUT  
OUT  
20mV/DIV  
100mV/DIV  
LT1366 F04b  
LT1366 F04a  
2µs/DIV  
2µs/DIV  
Figure 4a. LT1366 Power Supply Rejection Test  
Figure 4b. LT1368 Power Supply Rejection Test  
Typical applicaTions  
Buffering A/D Converters  
V
CC  
Figure 5 shows the LT1368 driving an LTC®1288 2-chan-  
nel micropower A/D converter (ADC). The LTC1288 can  
accommodate voltage references and input signals equal  
to the supply rails. The sampling nature of this ADC  
eliminates the need for an external sample-and-hold, but  
may call for a drive amplifier because of the ADC’s 12µs  
settling requirement. The LT1368’s rail-to-rail operation  
and low input offset voltage make it well-suited for low  
power, low frequency A/D applications. Either the LT1366  
or LT1368 could be used for this application. However,  
for low frequencies (f < 1kHz) the LT1368 provides better  
supply rejection.  
1µF  
0.1µF  
0.1µF  
+
V
0
1/2 LT1368  
CS/SHDN  
V
(REF)  
CC  
TO µP  
CH0  
CLK  
LTC1288  
CH1  
GND  
D
OUT  
D
+
IN  
V
1
LT1366 FO5  
1/2 LT1368  
0.1µF  
Figure 5. 2-Channel Low Power A/D Converter  
1366fb  
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