LMH1983 Datasheet, PDF (45/55 Pages) National Semiconductor (TI) – Generating 44.1 kHz Based highly integrated programmable audio

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Layout Example (continued)
LMH1983
SNLS309I – APRIL 2010 – REVISED DECEMBER 2014
Figure 34. No Pullback LLP, Single Row Reference Diagram
Table 14. No Pullback LLP Stencil Aperture Summary for LMH1983
DEVICE
PIN
COUNT
MKT.
DWG.
PCB I/O PCB
PAD SIZE PITCH
(mm) (mm)
PCB
DAP SIZE
(mm)
LMH1983
40 SNA40A 0.25 x 0.6 0.5
4.6 x 4.6
STENCIL
I/O
APERTURE
(mm)
0.25 x 0.7
STENCIL
DAP
APERTURE
(mm)
NUMBER of
DAP
APERTURE
OPENINGS
1.0 x 1.0
16
GAP BETWEEN
DAP APERTURE
(DIM A mm)
0.2
Figure 35. 40-Pin WQFN Stencil Example of Via and Opening Placement
The following PCB layout example is derived from the layout design of the LMH1983 in the SD1983EVK
Evaluation Module User's Guide (SNLU001). This graphic and additional layout board description demonstrates
both proper routing and solder techniques when designing in this clock generator.
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