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T7264 Datasheet

  • T7264

  • T7264 U-Interface 2B1Q Transceiver

  • 54頁

  • AGERE

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Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
Features
s
U-interface 2B1Q transceiver
鈥?Range over 18 kft on 26 AWG
鈥?ISDN basic-rate 2B+D
鈥?Full-duplex, 2-wire operation
鈥?2B1Q four-level line code
鈥?Conforms to ANSI North American Standard
T1.601-1992
鈥?Supports NT quiet mode and insertion loss test
mode for maintenance
K2 interface
鈥?2B+D data
鈥?512 kbits/s TDM interface
鈥?Frame and superframe markers
鈥?Embedded operations channel (eoc)
鈥?U-interface M bits and crc results
鈥?Device control and status
Other
鈥?Single +5 V (鹵5%) supply
鈥?鈥?0
擄C
to +85
擄C
鈥?44-pin PLCC
Power consumption
鈥?Operating 275 mW typical
鈥?Idle mode 30 mW typical
Analog front end
鈥?On-chip line driver for 2.5 V pulses
鈥?On-chip balance network
鈥?Sigma-delta A/D converter
鈥?Internal 15.36 MHz crystal oscillator
鈥?Supports 15.36 MHz external clock input
s
s
Digital signal processor
鈥?Digital timing recovery (pull range
鹵250
ppm)
鈥?Echo cancellation (linear and nonlinear)
鈥?Accommodates distortion from bridged taps
鈥?Scrambling/descrambling
鈥?crc calculations
鈥?Selectable LT or NT operation
鈥?Start-up sequencing with timers
鈥?Activation/deactivation support
鈥?Cold start in 3.5 seconds (typical)
鈥?Warm start in 200 ms (typical)
鈥?U-frame formatting and decoding
Description
The Lucent Technologies Microelectronics Group
T7264 U-Interface 2B1Q Transceiver integrated cir-
cuit provides full-duplex, basic-rate (2B+D) integrated
services digital network (ISDN) communications on a
2-wire digital subscriber loop at either the LT or NT
and conforms to the ANSI North American Standard
T1.601-1992. The single +5 V CMOS device is pack-
aged in a 44-pin plastic leaded chip carrier (PLCC).
s
s
s
K2
K2 BUS
FORMAT,
DECODE
SCRAMBLER
SIGNAL
DETECT
2B1Q
ENCODER
LINE
DRIVER
A/D
BALANCE
NETWORK
XTAL OSC.
15.36 MHz
2-WIRE
2B1Q
U-INTERFACE
ECHO
CANCELER
鈥?/div>
+
DEC
DESCRAM.
DFE AGC
T7264
鈭?/div>
DIG. PLL
5-5161
Figure 1. T7264 Simpli鏗乪d Block Diagram

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