LMH6881 Datasheet, PDF (26/35 Pages) Texas Instruments – Small Signal Bandwidth: 2400 MHz

LMH6881
SNOSC72F – JUNE 2012 – REVISED FEBRUARY 2015
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• Determine the maximum output swing required to be transmitted in-order to receive the signal with good
signal integrity. When driving long cable lengths, there is a possibility of corruption of differential signals due
to common mode signals which requires the use of devices that offer good common mode rejection. Also,
care must be taken to match the source impedance with the characteristic impedance of the CAT-5 cable to
minimize signal reflections at higher frequencies. The LMH6881 offers low differential output resistance that
makes source matching of driven cable very convenient.
• Verify the electrical and functional compatibility when interfacing LMH6881 digital input pins with the external
microcontroller (µC).
• Also, use appropriate power-supply architecture and supply bypass filtering devices to provide stable, low
noise supplies as mentioned in the Power Supply Recommendations.
8.2.2.3 Application Curves
20
f = 100 MHz
15 ^{Voltage Gain = 26dB}
10
5
0
-5
-25 -20 -15 -10 -5
0
INPUT POWER (dBm)
Figure 51. Output Power vs Input Power
0
-10
-20
-30
-40
-50
-60
1
10
100
1k
FREQUENCY (MHz)
Figure 52. Common Mode Rejection (Sdc21) vs Frequency
26
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