LMH6645 Datasheet, PDF (16/28 Pages) National Semiconductor (TI) – 2.7V, 650μA, 55MHz, Rail-to-Rail Input and Output Amplifiers with Shutdown Option

LMH6645, LMH6646, LMH6647
SNOS970C – JUNE 2001 – REVISED APRIL 2013
Figure 50 shows the output waveform.
V_OUT
V_S = 5V
A_V = +1
V_IN = 3.5V_PP
SD
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2 V/DIV
2.00 µs/DIV
Figure 50. Output Held Low by Active Pull-Down Circuit
If bipolar transistor power dissipation is not tolerable, the switch could be by a N-channel enhancement mode
MOSFET.
2.7V SINGLE SUPPLY RRIO 2:1 MUX
The schematic show in Figure 51 will function as a 2:1 MUX operating on a single 2.7V power supply, by utilizing
the shutdown feature of the LMH6647:
1/5
74HC04
1/5
74HC04
SELECT
INPUT
2k
INPUT A
2k
2.7V
-
SHUTDOWN
LMH6647
+
INPUT B
2.7V
R_L
SHUTDOWN
+
LMH664
7
-
2k
2k
Figure 51. 2:1 MUX Operating off a 2.7V Single Supply
Figure 52 shows the MUX output when selecting between a 1MHz sine and a 250KHz triangular waveform.
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