LMH6657_16 Datasheet, PDF (21/35 Pages) Texas Instruments – 270-MHz Single Supply, Single and Dual Amplifiers

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LMH6657, LMH6658
SNOSA35G – AUGUST 2002 – REVISED JULY 2015
Layout Guidelines (continued)
DEVICE
LMH6657MF
LMH6657MG
LMH6658MA
LMH6658MM
Table 1. Evaluation Board Guide
PACKAGE
SOT-23-5
SC-70
8-Pin SOIC
8-Pin VSSOP
EVALUATION BOARD PIN
LMH730216
LMH730165
LMH730036
LMH730123
Another important parameter in working with high speed/high performance amplifiers, is the component values
selection. Choosing external resistors that are large in value will effect the closed loop behavior of the stage
because of the interaction of these resistors with parasitic capacitances. These capacitors could be inherent to
the device or a by-product of the board layout and component placement. Either way, keeping the resistor values
lower, will diminish this interaction to a large extent. On the other hand, choosing very low value resistors will
load down nodes and will contribute to higher overall power dissipation.
10.2 Layout Example
SC-70 Board Layout (Actual size = 1.5 in × 1.5 in)
Figure 54. Layer 1 Silk
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