73M1903 Datasheet, PDF (1/46 Pages) Teridian Semiconductor Corporation – Modem Analog Front End

Simplifying System Integration^TM
73M1903
Modem Analog Front End
DATA SHEET
February 2009
DESCRIPTION
The Teridian 73M1903 Analog Front End (AFE)
IC includes fully differential hybrid driver outputs,
which connect to the telephone line interface
through a transformer-based DAA. The receive
pins are also fully differential for maximum
flexibility and performance. This arrangement
allows for the design of a high performance
hybrid circuit to improve signal to noise
performance under low receive level conditions,
and compatibility with any standard transformer
intended for PSTN communications applications.
The device incorporates a programmable
sample rate circuit to support soft modem and
DSP based implementations of all speeds up to
V.92 (56 kbps). The sampling rates supported
are from 7.2 kHz to 14.4 kHz by programming
pre-scaler NCO and PLL NCO.
The 73M1903 device incorporates a digital host
interface that is compatible with the serial ports
found on most commercially available DSPs and
processors and exchanges both payload and
control information with the host.
FEATURES
• Up to 56 kbps (V.92) performance
• Programmable sample rates (7.2 - 14.4 kHz)
• Reference clock range of 9-40 MHz
• Crystal frequency range of 9-27 MHz
• Host synchronous serial interface operation
• Pin compatible with 73M2901CL/CE
modems
• Low power modes
• On board line interface drivers
• Fully differential receiver and transmitter
• Drivers for transformer interface
• 3.0 V – 3.6 V operation
• 5 V tolerant I/O
• Industrial temperature range (-40 to +85 °C)
• JATE compliant transmit spectrum
• Package options:
• 32-pin QFN
• 20-pin TSSOP
• RoHS compliant (6/6) lead-free packages
Cost-saving features of the device include an
input reference frequency circuit, which accepts
a range of crystals from 9-27 MHz. It also
accepts external reference clock values between
9-40 MHz generated by the host processor. In
most applications, this eliminates the need for a
dedicated crystal oscillator and reduces the bill
of material (BOM).
The 73M1903 also supports two analog loop
back and one digital loop back test modes.
(HYBRID)
VBG
TXAP
TXAN
Transmit Analog
Drivers/ Sigma
Ref.
Filters
Delta
RXAP
RXAN
Receive
Mux/
Filters
Control Serial
DAC _{Registers Port}
GPIO
HOOK
DAA
Controls ^Clocks
Control
Logic
SCLK
SDIN
SDOUT
FSB
APPLICATIONS
• Set Top Boxes
• Personal Video Recorders (PVR)
• Multifunction Peripherals (MFP)
• Fax Machines
• Internet Appliances
• Game Consoles
• Point of Sale Terminals
• Automatic Teller Machines
• Speaker Phones
• RF Modems
Crystal
Rev. 2.0
© 2009 Teridian Semiconductor Corporation
1