Datasheet

APPLICATION INFORMATION
CONNECTION DIAGRAMS
POWER SUPPLY AND GROUNDING
PCM1690
SBAS448A – OCTOBER 2008 – REVISED JANUARY 2009 .............................................................................................................................................. www.ti.com
A basic connection diagram is shown in Figure 40 , with the necessary power-supply bypassing and decoupling
components. Texas Instruments ’ PLL170X is used to generate the system clock input at SCKI, as well as to
generate the clock for the audio signal processor. The use of series resistors (22 Ω to 100 Ω ) are recommended
for SCKI, LRCK, BCK, DIN1, DIN2, DIN3, and DIN4 for electromagnetic interference (EMI) reduction.
The PCM1690 requires +5 V for the analog supply and +3.3 V for the digital supply. The +5-V supply is used to
power the DAC analog and output filter circuitry, and the +3.3-V supply is used to power the digital filter and
serial interface circuitry. For best performance, it is recommended to use a linear regulator with the +5-V and
+3.3-V supplies.
Five capacitors are required for supply bypassing (see Figure 40 ). These capacitors should be located as close
as possible to the PCM1690 package. The 10- µ F capacitors are aluminum electrolytic, while the three 1- µ F
capacitors are ceramic.
36 Submit Documentation Feedback Copyright © 2008 – 2009, Texas Instruments Incorporated
Product Folder Link(s): PCM1690