FHP3350 Datasheet, PDF (14/19 Pages) Fairchild Semiconductor – Triple and Quad Voltage Feedback Amplifiers

Layout Considerations
General layout and supply bypassing play major roles in high
frequency performance. Fairchild has evaluation boards to use
as a guide for high frequency layout and as aid in device testing
and characterization. Follow the steps below as a basis for high
frequency layout:
• Include 6.8µF and 0.01µF ceramic capacitors
• Place the 6.8µF capacitor within 0.75 inches of the power pin
• Place the 0.01µF capacitor within 0.1 inches of the power pin
• Remove the ground plane under and around the part,
especially near the input and output pins to reduce parasitic
capacitance
• Minimize all trace lengths to reduce series inductances
Refer to the evaluation board layouts shown below for more
information.
Evaluation Board Information
The following evaluation boards are available to aid in the
testing and layout of thes devices:
Evaluation
Board #
KEB019
KEB020
KEB012
KEB018
Products
FHP3350IM14X
FHP3350IMTC14X
FHP3450IMTC14X
FHP3450IM14X
Figure 35. FHP3350 KEB019 (top side)
Evalutaion Board Schematics
DISABLE 1
1
IN1
RIN1
RF1
RG1
DISABLE 2
2
IN2
RIN2
RF2
RG2
DISABLE 3
3
IN3
RIN3
RF3
RG3
ROUT1
OUT1
ROUT2
OUT2
ROUT3
OUT3
Figure 36. FHP3350 KEB019 (bottom side)
Figure 34. FHP3350 KEB019/KEB020 schematic
www.fairchildsemi.com
14
FHP3350, FHP3450 Rev. 1A