PCM4201 datasheet(10/28 Pages) TI2

10 / 28 page

PCM4201

SBAS342B − DECEMBER 2004 − REVISED APRIL 2006

www.ti.com

PRODUCT OVERVIEW

The PCM4202 is a single channel audio analog-to-digital

converter (ADC) designed for use in low power, battery-

operated or portable professional audio equipment. Target

applications include digital wireless microphones and

portable

digital

audio

recorders/processors.

The

PCM4201 features 24-bit linear PCM output data, with a

format compatible with digital signal processors, digital

audio interface transmitters, and programmable logic

devices.

The PCM4201 includes three sampling modes, supporting

sampling rates up to 108kHz. The Normal Speed, Low

Power mode supports sampling rates up to 54kHz, and

employs 64x oversampling to reduce overall converter

power. The Normal Speed, High Performance mode

supports sampling rates up to 54kHz with 128x

oversampling, resulting in improved dynamic range and

THD+N when compared to the Low Power mode, at the

expense of increased power dissipation. The Double

Speed mode supports sampling frequencies up to 108kHz

and is provided for those applications where higher

sampling rates may be required.

A digital high-pass filter is included for DC removal.

Dedicated control pins are included for sampling mode

selection, Slave/Master mode audio serial port operation,

digital

high-pass

filter

enable/disable,

and

reset/

power-down functions.

A +5V power supply is required for the analog section of

the device, while a +3.3V power supply is typically utilized

for the digital section. The digital supply may be operated

at voltages as low as +1.8V, with a corresponding 10 to 20

milliwatt (mW) reduction in power dissipation, depending

upon the sampling mode selection. Figure 1 shows the

functional block diagram for the PCM4201.

HPF

Delta−Sigma

Modulator

Decimation

Filter

Voltage

Reference

REF+

REF−

INR+

INR−

Power

AGND

Reset

Logic

Clock

Control

Audio

Serial

Port

DGND

FSYNC

BCK

DATA

S/M

RATE

SCKI

RST

HPFD

Figure 1. PCM4201 Functional Block Diagram

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