E2U0024-16-X2
¡ Semiconductor
MSM7503
¡ Semiconductor
Multi-Function PCM CODEC
This version: Jan. 1998
MSM7503
Previous version: Nov. 1996
GENERAL DESCRIPTION
The MSM7503 is a high performance, low power CODEC LSI device integrating a 2-wire time
division transmission (ping-pong transmission) interface function and has a basic function of
man-machine interface to that of the MSM7502.
The MSM7503 operates from single 5 V power supply and is ideal for digital telephone terminals
such as pushbutton telephone sets and digital PBXs.
The MSM7503 ping-pong transmission interface supports a bidirectional communication of up
to 800 m long on the 2-wire twisted pair line, and can send and receive voice data at 64 kbps and
control data at 16 kbps.
The man-machine interface consists of analog speech path, key-scanner, tone generators,
CODEC meeting the
m/A
companding law, and processor interface, which are controlled via 8-
bit data buses.
FEATURES
• Single +5 V Power Supply
• Low Power Dissipation
Power ON Mode
Power Down Mode
• Pin-Pong Transmission
: 50 mW Typ. 100 mW Max.
: 15 mW Typ. 30 mW Max.
: Burst of 8 kHz, Transmission of 256 kbps,
AMI coding, 2-wire time division transmission
• Transmission data configuration
: Transmit Start bit (1 bit), K-bit (1 bit),
Control bit (2 bits), Voice bit (8 bits),
DC balance bit (1 bit), totalling 13 bits
Receive Sync bit (4 bits), K-bit (1 bit),
Control bit (2 bits), Voice bit (8 bits),
DC balance bit (1 bit), totalling 16 bits
• Control Data Interface supports synchronous and asynchronous communications
• Built-in Power-on Reset by the power supply voltage monitoring
• Output of the ping-pong transmission monitoring signal
• CODEC complied by the ITU-T companding law
• Calling Tone Interval
: Controlled by processor
• Calling Tone Combination
: Controlled by processor, 6 modes
• Calling Tone Volume
: Controlled by processor, 4 modes
• Ringing Tone Interval
: Controlled by processor
• Ringing Tone Frequency
: Controlled by processor, 6 modes
• Ringing Tone Level
: Controlled by processor, 4 levels
• Built-in PB Tone Generator
• Built-in Speech path Control Switches
• General Latch Output for External Control : 2 bits
• Watch-dog Timer
: 500 ms
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