73M1903 End Datasheet

73M1903 Datasheet, PDF, Equivalent


Part Number

73M1903

Description

Modem Analog Front End

Manufacture

TDK Semiconductor

Total Page 30 Pages
Datasheet
Download 73M1903 Datasheet


73M1903
DESCRIPTION
The TDK 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 (56Kbps). The sampling rates supported
are from 7.2kHz to 14.4kHz by programming
pre-scaler NCO and PLL NCO.
The TDK 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.
Cost saving features of the device include an
input reference frequency circuit, which accepts
a range of crystals from 9-27MHz. It also
accepts external reference clock values between
9-40MHz 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.
The 73M1903 in 32-TQFP package is footprint
compatible with 73M2901CL embedded modem
and allows for the same circuit design to
accommodate soft modem, V.22bis hard
modem, and high speed (V.32bis/V.34/V.92)
applications through population of an external
data pump device.
73M1903
Modem Analog Front End
PRODUCT DATA SHEET
JANUARY 2004
FEATURES
Up to 56Kbps (V.92) performance
Programmable sample rates (7.2 - 14.4kHz)
Reference clock range of 9-40MHz
Crystal frequency range of 9-27MHZ
Host synchronous serial interface operation
Pin compatible with 73M2901CL modem
Low power modes
On board line interface drivers
Fully differential receiver and transmitter
Drivers for transformer interface
3.0V – 3.6V operation
5V tolerant I/O
Industrial temperature range (-40 to +85°C)
JATE compliant transmit spectrum
Package options: 32-TQFP and 32-MLF
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
TXAP
TXAN
(HYBRID)
Transmit
Drivers/
Filters
Analog
Sigma
Delta
VBG
Ref.
RXAP
RXAN
Receive
Mux/
Filters
Control Serial
DAC Registers Port
GPIO
HOOK
DAA
Controls Clocks
Control
Logic
Crystal
SCLK
SDIN
SDOUT
FSB
http://www.tdksemiconductor.com TDK SEMICONDUCTOR CONFIDENTIAL
1/08/04 R4.031

73M1903
73M1903
Modem Analog Front End
PRODUCT DATA SHEET
REVISION HISTORY
Revision Level
2.4
2.5
3.0
3.3
3.4
3.5
3.6
3.7
3.8
Revision Date
March 13, 2003
May 22, 2003
June 2003
August 2003
August 2003
September 2003
September 9, 2003
September 9,2003
October 10, 2003
Revision Description
Generated Preliminary Datasheet Release
Inconsistent Pin-out tables corrected; Entered
limitation on effective divide > = 2.0; VBG=1.19V; Fs
range increased to 14.4kHz; Gain change in ALB
mode (Txd code must be reduced by 3dB);SCLK drive
strength increased by x5.
Make changes to reflect B01
Make changes to reflect B02
Make changes to delete test comments and pass
band ripple
Revised front sheet, added block diagram, IDD current
changed.
Add active low fonts, clean up register map, match
text to figures, general cleanup
Update footer revision on pages 1,2
Removed Pin 21 CLKOUT signal from package
drawing.
Update divider tables, RXG[1,0] setting, misc.
corrections
http://www.tdksemiconductor.com TDK SEMICONDUCTOR CONFIDENTIAL
1/08/04 R4.031


Features DESCRIPTION The TDK 73M1903 Analog Front End (AFE) IC includes fully differenti al hybrid driver outputs, which connect to the telephone line interface throug h a transformer-based DAA. The receive pins are also fully differential for ma ximum flexibility and performance. This arrangement allows for the design of a high performance hybrid circuit to imp rove signal to noise performance under low receive level conditions, and compa tibility with any standard transformer intended for PSTN communications applic ations. The device incorporates a progr ammable sample rate circuit to support soft modem and DSP based implementation s of all speeds up to V.92 (56Kbps). Th e sampling rates supported are from 7.2 kHz to 14.4kHz by programming pre-scale r NCO and PLL NCO. The TDK 73M1903 devi ce incorporates a digital host interfac e that is compatible with the serial po rts found on most commercially availabl e DSPs and processors and exchanges bot h payload and control information with the host. Cost saving fe.
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