73M1903-IVTR/F データシートの表示（PDF） - Teridian Semiconductor Corporation

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73M1903-IVTR/F

Modem Analog Front End

Teridian Semiconductor Corporation 

Simplifying System IntegrationTM

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

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