AMC1304L05_15 Datasheet, PDF (29/39 Pages) Texas Instruments – AMC1304x High-Precision,Reinforced Isolated Delta-Sigma Modulators with LDO

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11 Layout
AMC1304L05, AMC1304L25, AMC1304M05, AMC1304M25
SBAS655C – SEPTEMBER 2014 – REVISED SEPTEMBER 2015
11.1 Layout Guidelines
A layout recommendation showing the critical placement of the decoupling capacitors (as close as possible to the
AMC1304) and placement of the other components required by the device is shown in Figure 56. For best
performance, place the shunt resistor close to the VINP and VINN inputs of the AMC1304 and keep the layout of
both connections symmetrical.
For the AMC1304Lx version, place the 100-Ω termination resistor as close as possible to the CLKIN, CLKIN_N
inputs of the device to achieve highest signal integrity. If not integrated, an additional termination resistor is
required as close as possible to the LVDS data inputs of the MCU or filter device; see Figure 57.
11.2 Layout Examples
Top View
Clearance area,
to be kept free of any
conductive materials.
NC
1
AINP
AINN
16
DGND
NC
DVDD
0.1 µF 2.2 µF
SMD SMD
0603 0603
AGND
LEGEND
Top Layer:
Copper Pour and Traces
To Floating
Power
Supply
High-Side Area
Controller-Side Area
Via to Ground Plane
Via to Supply Plane
0.1 µF
SMD
0603
0.1 µF
SMD
0603
NC
LDOIN
VCAP
AGND
AMC1304Mxx
CLKIN
NC
DOUT
NC
DGND
Figure 56. Recommended Layout of the AMC1304Mx
To or From
MCU
(Filter)
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