ADA4922-1

Data Sheet

Rev. A | Page 18 of 19

PRINTED CIRCUIT BOARD LAYOUT

CONSIDERATIONS

Although the ADA4922-1 is used in many applications

involving frequencies that are well below 1 MHz, some general

high speed layout practices must be adhered to because it is a

high speed amplifier. Controlled impedance transmission lines

are not required for low frequency signals, provided the signal

rise times are longer than approximately 5 times the electrical

delay of the interconnections. For reference, typical 50 Ω

transmission lines on FR-4 material exhibit approximately

140 ps/in delay on outer layers and 180 ps/in for inner layers.

Most connections between the ADA4922-1 and the ADC can

be kept very short.

Place broadband power supply decoupling networks as close as

possible to the supply pins. Small surface-mount ceramic

capacitors are recommended for these networks, and tantalum

capacitors are recommended for bulk supply decoupling.