Philips Semiconductors
Digital telephone answering machine chip
Product specification
PCD6003
1 FEATURES
• Excellent speech quality at average: 2.6, 3.2 or
5.2 kbits/s Harmony or fixed 16.0 kbits/s P2CM
compression rate
• High quality music transparent encoding with
16.0 kbits/s P2CM
• Excellent Background Noise Suppression (BNS)
algorithm for speech quality improvement through
recording with reduced background noise (available with
P2CM and Harmony encoding)
• Speech compression rate selection: 2.6, 3.2 or
5.2 kbits/s Harmony, 16.0 kbits/s P2CM
• Speech decompression rate selection: 2.6, 3.2 or
5.2 kbits/s, 16.0 kbits/s P2CM
• Variable playback speed: 50%, 100% and 200% of real
time
• Voice prompt playback
• Philips International Language Library (PILL) support
tools available; coding at 2.6, 3.2 or 5.2 kbits/s
• Voice operated start message recording (VOX)
• Call progress detection by busy tone detection and
programmable silence detection
• Recording time of minimum 20 minutes in 4-Mbit flash
memory (at 3.2 kbits/s)
• Excellent true full-duplex handsfree performance
provided by Philips ‘phlux’ algorithm
• On-hook caller ID detection according to Bell 202 and
V.23 standards, as well as DTMF caller ID support
• Caller Alerting Signal (CAS) - caller ID level 2
• Dual tone generation for DTMF, melody tones and
information tones
• Optional dial tone detection, and optional ringing
detection using hardware Caller Identification (CID)
interface
• DTMF detection (for remote control function) with local
echo canceller for high reliability
• Digital volume control
• Mixed digital/analog adaptive limit and/or level control of
audio input signals
• Programmable analog CODEC gain for easy interfacing
• Internal 80C51 microcontroller can operate as system
controller; with selectable operating frequencies
between 1 and 21 MHz
• Internal 80C51 microcontroller emergency operation
down to 2.2 V eliminates the need for external diallers in
telephone answering machine applications
• Standard 80C51 development tools allow fast design of
Man-Machine-Interface (MMI) features
• On-board Minimum Shift Keying (MSK) modem for
CT0/CT1 applications
• Two integrated differential bit stream Analog-to-Digital
Converters (ADCs) for high quality audio input
• Two integrated differential bitstream Digital-to-Analog
Converters (DACs) for high quality audio output
• Software selectable auxiliary CODEC input channel
• Up to 38 general purpose digital I/O lines (most of them
bidirectional) including I2C-bus, available for connection
to keyboard, display, line interface, etc.
• On-chip 2-channel time multiplexed 8-bit general
purpose ADC for e.g. parallel set detection and battery
voltage measurement
• On-chip 8-bit general purpose DAC for e.g. speaker
amplifier volume control
• Day and time stamp possibility using built-in Real-Time
Clock
• Flexible speech memory interface for connection of
several types of speech flash memory (serial, CAD or
parallel) and DRAM
• I2C master/slave bus for peripheral control or I2C-bus
speech memory access
• Extensive power management support for battery and
emergency operation, also allowing portable (voice
memo) applications
• Digital IOM A/u-law interface for Slave or Master mode
operation at various bit rates
• Emergency operation from telephone line power only;
microprocessor and DTMF generator continue to
operate in this mode
• On-chip software switchable supply voltage for electret
microphone
• Single low supply voltage (2.2 to 2.8 V)
• Built-in single low-frequency, low-power, crystal or
ceramic resonator oscillator and on-chip PLL to reduce
EMI
• Stand-alone operation with low cost PAL, NTSC and
DTMF crystals
2001 Apr 17
3