LMH6554_15 Datasheet, PDF (17/29 Pages) Texas Instruments – LMH6554 2.8-GHz Ultra Linear Fully Differential Amplifier

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LMH6554
SNOSB30P – OCTOBER 2008 – REVISED JANUARY 2015
9.2.3 Single Supply Operation
Single 5V supply operation is possible: however, as discussed earlier, AC input coupling is recommended due to
input common mode limitations. An example of an AC coupled, single supply, single-to-differential circuit is
shown in Figure 31. Note that when AC coupling, both inputs need to be AC coupled irrespective of single-to-
differential or differential-differential configuration. For higher supply voltages DC coupling of the inputs may be
possible provided that the output common mode DC level is set high enough so that the amplifier's inputs and
outputs are within their specified operation ranges.
R_S
V_S
=
0.1 2F RG
R_T
V_CM
0.1 2F
R_G
R_M
R_F
R_O
+
LMH6554
-
C_L R_L V_O
R_O
R_F
V_EN
Figure 31. AC Coupled for Single Supply Operation
For optimum performance, split supply operation is recommended using +2.5-V and −2.5-V supplies; however,
operation is possible on split supplies as low as +2.35 V and −2.35 V and as high as +2.65 V and −2.65 V.
Provided the total supply voltage does not exceed the 4.7-V to 5.3-V operating specification, non-symmetric
supply operation is also possible and in some cases advantageous. For example, if a 5-V DC coupled operation
is required for low power dissipation but the amplifier input common mode range prevents this operation, it is still
possible with split supplies of (V+) and (V-). Where (V+)-(V-) = 5 V and V+ and V- are selected to center the
amplifier input common mode range to suit the application.
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