®
AFE1224
AFE1224
For most current data sheet and other product
information, visit www.burr-brown.com
2Mbps, Single Pair ANALOG FRONT END
FEATURES
● E1/T1 SINGLE PAIR 2B1Q
● SCALEABLE DATA RATE
● PIN COMPATIBLE WITH AFE1124
● COMPLETE ANALOG INTERFACE
● –40°C TO +85°C OPERATION
● PROGRAMMABLE POWER DISSIPATION
● 28-LEAD SSOP
● 64kbps TO 2320kbps OPERATION
DESCRIPTION
Burr-Brown’s Analog Front End minimizes the size
and cost of a single pair High bit rate Digital Sub-
scriber Line (HDSL) system by providing all of the
active analog circuitry needed to connect an HDSL
digital signal processor to an external compromise
hybrid and an HDSL line transformer. The transmit
and receive filter responses automatically change with
clock frequency, allowing the AFE1224 to operate
over a wide range of data rates. The power dissipation
of the device can be reduced under digital control for
operation at lower speeds. The AFE1224 will operate
at bit rates from 64kbps to 2.320Mbps.
Functionally, this unit consists of a transmit and a
receive section. The transmit section generates analog
signals from 2-bit digital symbol data and filters the
analog signals to create 2B1Q symbols. The on-board
differential line driver provides a 13.5dBm signal to
the telephone line. The receive section filters and
digitizes the symbol data received on the telephone
line. The AFE1224 operates on a single 5V supply.
The digital circuitry in the unit can be connected to a
supply from 3.3V to 5V. The chip uses only 355mW
for full-speed operation. It is housed in a 28-lead
SSOP package.
txLINE
Pulse Former
txLINE
Line Driver
tx and rx
Control
Registers
tx and rx
Interface
Lines
Difference
Amplifier
rxHYB
rxHYB
Decimation
Filter
∆Σ
Modulator
PGA
rxLINE
rxLINE
AFE1224
Patents Pending
International Airport Industrial Park
•
Mailing Address: PO Box 11400, Tucson, AZ 85734
•
Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706
• Tel: (520) 746-1111
Twx: 910-952-1111
•
Internet: http://www.burr-brown.com/
•
Cable: BBRCORP Telex: 066-6491
•
•
FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
•
©1999 Burr-Brown Corporation
PDS-1548A
Printed in U.S.A. June, 1999
SBWS011