AND Gate

D+

D-

VBUS

GND

V L

IN

V R

IN

V L

OUT

V R

OUT

DOUT DIN

Connection to ground plane

Connection to power 3.3V

Top layer traces

1.5kOhm

22Ohm

22Ohm

10uF

10uF

12MHz

1MOhm

Decoupling capacitors as

close as possible to de IC

Clock hardware for

built-in resonator

HID controls

1.5kOhmx3

10pF-33pF

10pF-33pF

1MOhm

10uF

10uF

10uF

10uF

USB port

SSPND

PCM2903C

Top layer ground plane

PCM2903C

SBFS038A – JUNE 2012 – REVISED SEPTEMBER 2015

www.ti.com

11 Power Supply Recommendations

The voltage source needed to power the PCM2903C must be between 3 V and 3.6 V for a proper operation. It is

recommended to place decoupling capacitor in every voltage source pin. This will help filter lower frequency

power supply noise. Place these decoupling capacitors as close as possible to the PCM2903C.

12 Layout

12.1 Layout Guidelines

The decoupling capacitors must be as close as possible to the PCM2903C pins. It is recommended to place a

lowpass Filter in the analog input and output. At least the analog input and analog output need a series capacitor

to eliminate any possible offset level. The PCM2903C is a low power device so there is no need for a special

heat sink PCB design.

12.2 Layout Example

Figure 48. Layout Example Recommendation

26

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