PCM4201 datasheet(16/28 Pages) TI2

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PCM4201

SBAS342B − DECEMBER 2004 − REVISED APRIL 2006

www.ti.com

APPLICATIONS INFORMATION

A typical connection diagram for the PCM4201 is shown

in Figure 11.

Power supply bypass and reference

decoupling capacitors are included, and are labeled with

recommended values. The 0.1

µF capacitors should be

X7R ceramic chip type, although other low ESR capacitor

types may also be used. The 10

µF capacitors may be low

ESR

tantalum,

multilayer

ceramic,

aluminum

electrolytic capacitors. Analog and digital ground pins

should be connected at a common point, preferably

beneath the PCM4201 package.

Printed circuit board layout is critical for best performance.

Please refer to the PCM4201EVM User’s Guide (TI

literature number SBAU108) for an example of a design

and layout that meets the published specifications for the

PCM4201.

INPUT BUFFER CIRCUIT EXAMPLES

The PCM4201 analog input requires some type of input

buffer or signal conditioning circuitry, especially when

interfacing to a microphone capsule. The input buffer or

amplifier must incorporate at least a single pole, RC

low-pass filter in order to provide antialias filtering for the

delta-sigma modulator. A filter with a −3dB corner

frequency in the range of 100kHz to 150kHz should be

sufficient for common audio output sampling rates equal to

or greater than 44.1kHz. However, a low-pass filter with a

lower corner frequency and possibly a higher filter order

will be required when running at the lower sampling rates,

depending upon the system requirements. Examples of

single-ended and differential input circuits are shown in

Figure 12 and Figure 13, respectively.

IN+

IN−

AGND

RATE

S/M

RST

HPFD

REF+

REF−

DGND

SCKI

BCK

FSYNC

DATA

PCM4201

From

Control

Logic

DSP, FPGA,

DIT4096

System Clock

0.1

µF

0.1

µF

+1.8V to +3.6V

Analog

Input

Buffer

µF0.1µF

+5V

Figure 11. Typical Connections for the PCM4201

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