FEATURES

2.7-V Operation

Two Differential Microphone Inputs, One

Differential Earphone Output, and One

Single-Ended Earphone Output

Programmable Gain Amplifiers for Transmit,

Receive, Sidetone, and Volume Control

Earphone Mute and Microphone Mute

On-Chip I2C Bus, Which Provides a Simple,

Standard, Two-Wire Serial Interface With

Digital ICs

Programmable for 15-Bit Linear Data or 8-Bit

Companded (μ-Law or A-Law) Data

Available in a 32-Pin Thin Quad Flatpack

(TQFP) Package and an 80-Pin GQE MicroStar

Junior Ball Grid Array (BGA)

Designed for Analog and Digital Wireless

Handsets and Telecommunications

Applications

Dual-Tone Multifrequency (DTMF) and Single

Tone Generator

Pulse Density Modulated (PDM) Buzzer

Output

APPLICATIONS

Digital Handset

Digital Headset

Cordless Phones

Digital PABX

Digital Voice Recording

DESCRIPTION

The PCM codec is designed to perform transmit

encoding analog/digital (A/D) conversion, receive

decoding digital/analog (D/A) conversion, and transmit

and receive filtering for voice-band communications

systems. The device operates in either the 15-bit linear

or 8-bit companded (μ-law or A-Law) mode, which is

selectable through the I2C interface. The PCM codec

generates its own internal clocks from a 2.048-MHz

master clock input.