LMH6503

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SNOSA78E – OCTOBER 2003 – REVISED APRIL 2013

CIRCUIT LAYOUT CONSIDERATIONS

Good high-frequency operation requires all of the de-coupling capacitors shown in Figure 64 to be placed as

close as possible to the power supply pins in order to insure a proper high-frequency low-impedance bypass.

Adequate ground plane and low inductive power returns are also required of the layout. Minimizing the parasitic

capacitances at pins 3, 4, 5, 6, 9, 10 and 12 will assure best high frequency performance. The parasitic

inductance of component leads or traces to pins 4, 5 and 9 should also be kept to a minimum. Parasitic or load

circuit oscillation. The LMH6503 is fully stable when driving a 100

Ω load. With reduced load (e.g. 1kΩ) there is a

possibility of instability at very high frequencies beyond 400MHz especially with a capacitive load. When the

LMH6503 is connected to a light load as such, it is recommended to add a snubber network to the output (e.g.

100

by placing a small resistor in series with the output (pin 10).

Figure 64. Required Power Supply Decoupling

Component parasitics also influence high frequency results. Therefore it is recommended to use metal film

resistors such as RN55D or leadless components such as surface mount devices. High profile sockets are not

recommended.

Texas Instruments suggests the following evaluation board as a guide for high frequency layout and as an aid in

device testing and characterization:

Device

Package

Evaluation Board Part Number

LMH6503MA

SOIC-14

LMH730033

SINGLE SUPPLY OPERATION

It is possible to operate the LMH6503 with a single supply. To do so, tie pin 11 (GND) to a potential about mid

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