ltm9005v Linear Technology Corporation, ltm9005v Datasheet - Page 21

• Manufacturer Part Number: ltm9005v
• Description: Ltm9005 - If Sampling Receiver Subsystem
• Manufacturer: Linear Technology Corporation

applicaTions inForMaTion
Recommended Layout
The high integration of the LTM9005 makes the PCB board
layout very simple and easy. However, to optimize its electri-
cal and thermal performance, some layout considerations
are still necessary.
• Use large PCB copper areas for ground. This helps to
• Use multiple ground vias. Using as many vias as possible
• Separate analog and digital traces as much as pos-
dissipate heat in the package through the board and
also helps to shield sensitive on-board analog signals.
Common ground (GND) and output ground (OGND)
are electrically isolated on the LTM9005, but can be
connected on the PCB underneath the part to provide
a common return path.
helps to improve the thermal performance of the board
and creates necessary barriers sepa-rating analog and
digital traces on the board at high frequencies.
sible, using vias to create high-frequency barriers.
This will reduce digital feedback that can reduce the
• Connect pad A8 to B8 on the top layer with no other
Figure # through ## give a good example of the recom-
mended layout.
The quality of the paste print is an important factor in
producing high yield assemblies. It is recommended to
use a type 3 or 4 printing no-clean solder paste. The solder
stencil design should follow the guidelines outlined in Ap-
plication Note 100. Avoid ultrasonic cleaning.
The LTM9005 employs gold-finished pads for use with
Pb-based or tin-based solder paste. It is inherently Pb-free
and complies with the JEDEC (e4) standard. The materi-
als declaration is available online at http://www.linear.
com/leadfree/mat_dec.jsp.
signal-to-noise ratio (SNR) and dynamic range of the
LTM9005.
connections. These pads should not be connected to
any other circuitry or ground. Keep these two pads free
from noise. Connect A9 to B9, L8 to M8 and L9 to M9
in the same manner.
LTM9005
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9005p