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TDK Semiconductor |
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
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
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