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What is 73M1903C?

This electronic component, produced by the manufacturer "Teridian Semiconductor", performs the same function as "Modem Analog Front End".


73M1903C Datasheet PDF - Teridian Semiconductor

Part Number 73M1903C
Description Modem Analog Front End
Manufacturers Teridian Semiconductor 
Logo Teridian Semiconductor Logo 


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Simplifying System IntegrationTM
DS_1903C_033
DESCRIPTION
The 73M1903C 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
16.0 kHz by programming the pre-scaler NCO and the
PLL NCO.
The 73M1903C 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. This interface can be configured as a
single master/slave mode or as a daisy chain mode
that allows the user to connect up to eight 73M1903C
devices to a single host for multi Analog Front End
applications, such as, central server modems.
Costs saving features of the device include an input
reference frequency circuit, which accepts a range of
crystals from 4.9-27 MHz. It also accepts external
reference clock values between 1 MHz and 40 MHz
generated by the host processor. In most
applications, this eliminates the need for a dedicated
crystal oscillator and reduces the bill of materials
(BOM).
The 73M1903C also supports two analog loop back
and one digital loop back test modes.
73M1903Cwww.DataSheet4U.com
Modem Analog Front End
DATA SHEET
March 2010
FEATURES
Two pairs of software selectable transmit
differential outputs for worldwide impedance
driver implementations.
Up to 56 kbps (V.92) performance
Programmable sample rates (7.2-16.0 kHz)
Reference clock range of 1-40 MHz
Crystal frequency range of 4.9-27 MHz
Master or slave mode operation
Daisy chain configurable synchronous serial
Host interface
Low power modes
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 option: 32-pin QFN
APPLICATIONS
Central site server modems
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
Digital Answering Machines
RF Modems
TXAP1
TXAN1
TXAP2
TXAN2
RXAP
RXAN
(HYBRID)
Transmit
Drivers/
Filters
Analog
Sigma
Delta
VBG
Ref.
Receiver
MUX/
Filters
DAC
Control
Registers
Serial
Port
GPIO
HOOK
DAA
controls
Clock
Control
Logic
SCLK
SDIN
SDOUT
FS
FSD
Crystal
Rev. 5.0
1

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73M1903C equivalent
DS_1903C_033
Pin Name
RXAN
RXAP
TXAN1
TXAN2
TXAP1
TXAP2
Type
I
I
O
O
O
O
Pin #
14
15
10
11
12
13
SCLK
I/O 8
SDOUT
SDIN
FS
TYPE
O 32
I 29
O7
I 27
SckMode
I 28
FSD
O 21
73M1903CwwDwa.DtaataSShheeete4Ut .com
Description
Receive analog negative input.
Receive analog positive input.
Transmit analog negative output 1.
Transmit analog negative output 2.
Transmit analog positive output 1.
Transmit analog positive output 2.
Serial interface clock. With master mode and SCLK
continuous selected, Freq = 256*Fs ( =2.4576 MHz for
Fs=9.6 kHz). For slave mode, this pin must be pulled
down by a resistor (<4.7 kΩ).
Serial data output (or input to the host).
Serial data input (or output from the host).
Frame synchronization. (Active Low)
Type of frame sync. 0 = late (mode0); 1 = early (mode1).
Weak-pulled high – default
Controls the SCLK behavior after FS. Open, weak-pulled
high = SCLK Continuous; tied low = 32 clocks per R/W
cycle.
Delayed frame sync to support daisy chain mode with
additional 73M1903C devices.
Rev. 5.0
5


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Featured Datasheets

Part NumberDescriptionMFRS
73M1903The function is Modem Analog Front End. TDK SemiconductorTDK Semiconductor
73M1903The function is Modem Analog Front End. Teridian SemiconductorTeridian Semiconductor
73M1903CThe function is Modem Analog Front End. Teridian SemiconductorTeridian Semiconductor

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