MAX4181 Maxim, MAX4181 Datasheet - Page 16

• Manufacturer Part Number: MAX4181
• Description: The MAX4180 family of current-feedback amplifiers combines high-speed performance, low distortion,and excellent video specifications with ultra-low-power operation in miniature packages
• Manufacturer: Maxim

Single/Dual/Quad, 270MHz, 1mA, SOT23,
Current-Feedback Amplifiers with Shutdown
• Keep lines as short and as straight as possible.
• Do not make 90° turns; round all corners.
• Observe high-frequency bypassing techniques to
• Place a 1µF ceramic capacitor in parallel with each
• Place a 10µF to 15µF low-ESR tantalum at the point
• Keep PC traces short and use surface-mount com-
Figure 2a. SOT23 High-Speed EV Board
Component Placement Guide—
Component Side
Figure 3a. SO-8 High-Speed EV Board
Component Placement Guide—
Component Side
16
maintain the amplifiers’ accuracy. The bypass cap-
acitors should include a 0.01µF to 0.1µF ceramic
capacitor between each supply pin and the ground
plane, located as close to the package as possible.
0.01µF to 0.1µF capacitor as close to them as
possible.
of entry to the power-supply pins’ PC board. The
power-supply trace should lead directly from the
tantalum capacitor to the V
ponents to minimize parasitic inductance.
______________________________________________________________________________________
CC
and V
EE
Figure 2b. SOT23 High-Speed EV Board
Layout—Component Side
Figure 3b. SO-8 High-Speed EV Board
Layout—Component Side
pins.
Figures 2 and 3 show layouts of Maxim’s high-speed
single SOT23 and SO evaluation boards. These boards
were developed using the techniques described above.
The smallest available surface-mount resistors were
used for feedback and back-termination to minimize
their distance from the part, reducing the capacitance
associated with longer lead lengths.
SMA connectors were used for best high-frequency
performance. Because distances are extremely short,
performance is unaffected by the fact that inputs and
outputs do not match a 50Ω line. However, in applica-
tions that require lead lengths greater than one-quarter
of the wavelength of the highest frequency of interest,
use constant-impedance traces.
Fully assembled evaluation boards are available for the
MAX4180ESA.
Maxim’s High-Speed Evaluation Board
Figure 2c. High-Speed EV Board Layout—
Solder Side
Figure 3c. SO-8 High-Speed EV Board
Layout—Solder Side