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LF13509M Scheda tecnica(PDF) 10 Page - National Semiconductor (TI) |
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LF13509M Scheda tecnica(HTML) 10 Page - National Semiconductor (TI) |
10 / 16 page Typical Applications (Continued) D DOUBLING THE SYSTEM CHANNEL CAPABILITY This is done in two different ways First we can use second level multiplexing with speed benefits as shown in Figure 9 A fast 2-channel multiplexer made by the dual analog switch AM182 accepts the outputs of each 8-channel MUX LF13508 and then feeds them sequentially into an 8-bit successive approximation AD converter With this tech- nique the throughput rate of the system can again be made independent of the LF13508 speed Looking at the timing diagram when the AD converter converts the analog value of an upper multiplexer channel we switch channels in the lower multiplexer for the next conversion This can be done provided that TMUX s TC a 1CP The LF356 connected as unity gain buffers are used be- cause of the low input impedance of the AD they are con- nected between multiplexers for speed optimization With a maximum clock frequency of 45 MHz Th R e 106 16 c 2 e 3125k samplessecchannel and D VIN D t max k 10 256 c 1 2ms e 195 mV ms for 10VFS An alternate way to increase the system channel is shown in Figure 10 where the enable pins are used to disable one MUX while the other is sampling With this method many 8- channel multiplexers can be connected but the parasitic capacitance at the common output node will keep increas- ing and will eventually degrade the settling time ts(ON) Also the MUX speed will now affect the system throughput If for instance this method was used instead of second level multiplexing the system of Figure 9 will lose half of its speed If however speed is not the prime system require- ment the approach of Figure 10 is more cost effective E DIFFERENTIAL INPUT SYSTEMS Systems operating in industrial environments may require an instrumentation amplifier to separate the desired analog signal from any common-mode signal present The LF11509 was designed to provide 4 pairs of differential in- put signals to the input of an instrumentation amplifier for further process TLH5668 – 15 The acquisition time TA of the Sample and Hold depends upon RON IDSS of switches ZOUT of switches IDSSj15 mA ZOUTe40 kX VINe10V Che1000 pF TAe20 ms to 01% Error created by charge injection during Hold mode DVEj10 pF (145VbVIN)Ch FIGURE 8 Inexpensive Sample and Hold 10 |
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