PCM1789 Datasheet, PDF (33/41 Pages) Texas Instruments – 24-Bit, 192-kHz Sampling, Enhanced Multi-Level ΔΣ,Stereo, Audio Digital-to-Analog Converter

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10 Layout
PCM1789
SBAS451B – OCTOBER 2008 – REVISED AUGUST 2015
10.1 Layout Guidelines
A typical printed circuit board (PCB) layout for the PCM1789 is shown in Figure 41. A ground plane is
recommended, with the analog and digital sections being isolated from one another using a split or cut in the
circuit board. The PCM1789 should be oriented with the digital I/O pins facing the ground plane split/cut to allow
for short, direct connections to the digital audio interface and control signals originating from the digital section of
the board.
Separate power supplies are recommended for the digital and analog sections of the board. This configuration
prevents the switching noise present on the digital supply from contaminating the analog power supply and
degrading the dynamic performance of the PCM1789.
10.2 Layout Example
Digital Power
+3.3 V_D DGND
Analog Power
AGND +5 V_A +V_S -V_S
Digital Logic
and
Audio
Processor
VDD VCC
DGND
PCM1789
AGND
Output
Circuits
Digital Section
Analog Section
Return Path for 3.3 V_D and Digital Signals
Figure 41. Recommended PCB Layout
Digital
Ground
Analog
Ground
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