LMH6551MAX_NOPB Datasheet, PDF (18/28 Pages) Texas Instruments – LMH6551 Differential, High Speed Op Amp

LMH6551
SNOSAK7C – FEBRUARY 2005 – REVISED MARCH 2013
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CAPACITIVE DRIVE
As noted in DRIVING ANALOG TO DIGITAL CONVERTERS, capacitive loads should be isolated from the
amplifier output with small valued resistors. This is particularly the case when the load has a resistive component
that is 500Ω or higher. A typical ADC has capacitive components of around 10 pF and the resistive component
could be 1000Ω or higher. If driving a transmission line, such as 50Ω coaxial or 100Ω twisted pair, using
matching resistors will be sufficient to isolate any subsequent capacitance. For other applications see Figure 7
and Figure 8 in Typical Performance Characteristics.
POWER DISSIPATION
The LMH6551 is optimized for maximum speed and performance in the small form factor of the standard SOIC
package, and is essentially a dual channel amplifier. To ensure maximum output drive and highest performance,
thermal shutdown is not provided. Therefore, it is of utmost importance to make sure that the T_JMAXof 150°C is
never exceeded due to the overall power dissipation.
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