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Электронный компонент: 73M1903

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The 73M1903 is a single-chip analog front end (AFE) that's ideal for DSP or
RISC-based soft modem applications such as fax and multi-function peripherals
(MFPs), game consoles, Internet appliances, and set-top boxes. It offers a
complete array of features designed to reduce the external component count.
Reduced Component Count
The device eliminates the need for a dedicated crystal oscillator with a flexible
PLL, a 16-bit CODEC, differential hybrid circuitry, GPIO pins, and integrated
DAA control.
Programmable Sample Rates
The 73M1903 can be programmed for various sample rates support modem
standards operating at speeds from 600bps to 56Kbps.
Pin Compatible with 73M2901CL
A distinctive feature of this device is its pin compatibility with TDK's flagship
V.22bis hard modem, the 73M2901CL. It also has the ability to support third
party high speed data pumps on the same PCB. This offers customers a cost
effective method to configure low and high-speed modem solutions in the same
system as well as a risk-free migration path from hard to soft modems.
Fully Differential Hybrid Circuitry
Having fully differential hybrid circuitry improves signal-to-noise ratio
performance under low receive level conditions, and ensures compatibility with
any standard transformer-based DAA. On-chip registers facilitate management
of DAA functions including parallel pick-up, ring detection, caller ID, and hook
control through the same serial port used for data.
Flexible DAA Configuration
The device can be configured for FCC, CTR-21 and other worldwide
telecommunications standards, and operates at speeds of 600bps to 56Kbps. It
also supports two power conservation operating modes and seven test modes.
TDK Semiconductor's expertise in analog and mixed-signal technology has
made it possible to develop a very flexible and yet cost-effective AFE
companion to RISC processors or DSPs in embedded communications
applications.
Single-Chip Analog Front End
73M1903 Product Brief
Features
Single-chip Analog Front End
Supports 56kbps (V.92) operation
Pin-compatible to TDK 73M2901CL
embedded modem
16 bit codec with integrated hybrid
Programmable sample rate
Supports multiple crystal frequencies
8 user programmable I/O pins
Full differential receiver/transmitter
Direct interface to transformer
Compatible with popular DSPs and
processors
Applications
Set-top Boxes (STB)
Personal Video Recorders (PVR)
Fax and Multi-function Peripherals (MFP)
Game consoles
POS Terminals
ATM Machines
Personal Computers
PDA and Internet Appliances
Modem AFE with Integrated Hybrid Circuitry
TDK Semiconductor Corp.
2642 Michelle Dr.
Tustin, CA 92780
714-508-8800 (phone) 714-508-8877 (fax)
support@tdksemiconductor.com
www.tdksemiconductor.com
No responsibility is assumed by TDK Semiconductor Corporation for use of this product nor for any infringements of
patents and trademarks or other rights of third parties resulting from its use. No license is granted under any patents,
patent rights or trademarks of TDK Semiconductor Corporation, and the company reserves the right to make changes
in specifications at any time without notice. Accordingly, the reader is cautioned to verify that the data sheet is current
before placing orders.
2003 TDK Semiconductor Corporation
3/03 - rev 1.0
73M1903 Block Diagram
Receive
Mux/
Filters
Transmit
Drivers/
Filters
TXAP
TXAN
(HYBRID)
DAA
Controls
RXAP
RXAN
HOOK
Analog
Sigma
Delta
Control
Registers
Ref.
Clocks
Control
Logic
DAC
VBG
Serial
Port
SCLK
SDIN
SDOUT
FSB
Crystal
GPIO
Fully differential receiver for low-noise, low-level reception
Cancels common mode noise from environmental
sources such as power lines
Wide receive dynamic range
Flexible input reference frequency
Accepts a range of crystal or external reference clock values
between 9-40MHz.
Eliminates the need for a dedicated crystal oscillator in most
applications
5V tolerant I/O on selected pins
All digital interface pins can be interfaced to 5v w/o level shifting
Power supply
3.0v to 3.6v
Industrial temperature range
-40C to 85C operating
Pacakages
32-pin TQFP pin-compatible with 73M2901CL
20-pin SOIC for cost sensitive applications
Multi-mode Modem Analog Front End (MAFE)
Supports modem data rates from 50bps to 56Kbps (V.92)
Includes drivers and modem hybrid circuit to simplify modem
designs
DSP synchronous serial interface master operation
Uses a standard DSP serial interface for communication
Supports optional timing modes
Supplies frame sync and serial timing clock to host
Programmable sample rates
Various rates supported by programming prescaler NCO
and PLL NCO
Fully differential transmitter with high-current transformer
drivers
Class AB drivers for low quiescent current
Directly interface to transformer through impedance matching
resistors
Driver current proportional to load requirements