LMH6570

SNCS104D – APRIL 2005 – REVISED DECEMBER 2014

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Typical Application (continued)

7.2.3 Multiplexer Expansion

It is possible to use multiple LMH6570 devices to expand the number of inputs that can be selected for output.

Figure 27 shows a 4:1 MUX using two LMH6570 devices.

Figure 27. 4:1 MUX Using Two LMH6570 Devices

In such an application, the output settling may be longer than the LMH6570 switching specifications (~20 ns),

while switching between two separate LMH6570 devices. The switching time limiting factor occurs when one

LMH6570 is turned off and another one is turned on, using the SD (shutdown) pin. The output settling time

consists of the time needed for the first LMH6570 to enter high impedance state plus the time required for the

second LMH6570 output to dissipate left-over output charge of the first device (limited by the output current

capability of the second device) and the time needed to settle to the final voltage value.

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