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.