PCM1691 datasheet(36/47 Pages) TI

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APPLICATION INFORMATION

CONNECTION DIAGRAMS

POWER SUPPLY AND GROUNDING

PCM1691

SBAS450 – OCTOBER 2008.............................................................................................................................................................................................. 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 PCM1691 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 (such as the

REG102-5/33 or REG103-5/33) with the +5-V and +3.3-V supplies.

Five capacitors are required for supply bypassing, as shown in Figure 40. These capacitors should be located as

close as possible to the PCM1691 package. The 10-

µF capacitors are aluminum electrolytic, while the three 1-µF

capacitors are ceramic.

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