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BT8960 Datasheet

  • BT8960

  • Single-Chip 2B1Q Transceiver

  • 104頁

  • ETC

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Bt8960
Single-Chip 2B1Q Transceiver
The Bt8960 is a full-duplex 2B1Q transceiver based on Rockwell鈥檚 HDSL technol-
ogy. It supports Nx64 kbps transmission of more than 18,000 feet over 26 AWG
copper telephone wire without repeaters. Small size and low power dissipation
make the Bt8960 ideal for line-powered voice pairgain systems capable of provid-
ing four or six clear 64 kbps channels.
The Bt8960 is a highly integrated device that includes all of the active circuitry
needed for a complete 2B1Q transceiver. In the receive portion of the Bt8960, a
variable gain ampli鏗乪r optimizes the signal level according to the dynamic range
of the analog-to-digital converter. Once the signal is digitized, sophisticated adap-
tive echo cancellation, equalization, and detection DSP algorithms reproduce the
originally transmitted far-end signal.
In the transmitter, the transmit source and scrambler operation is programma-
ble via the microcomputer interface. A highly linear digital-to-analog converter
with programmable gain, sets the transmission power for optimal performance. A
pulse-shaping 鏗乴ter and a low distortion line driver generate the signal character-
istics needed to drive a large range of subscriber lines at low-bit error rates.
Startup and performance monitoring operations are controlled via the micro-
processor interface. C-language source code supporting these operations is sup-
plied under a no-fee license agreement from Rockwell. The Bt8960 includes a
glueless interface to both Intel and Motorola microprocessors.
Distinguishing Features
鈥?/div>
鈥?/div>
Single-chip 2B1Q transceiver solution
All 2B1Q transceiver functions inte-
grated into a single monolithic device
鈥?Receiver gain control and A/D
converter
鈥?DSP functions including echo
cancellation, equalization, timing
recovery, and symbol detection
鈥?Programmable gain transmit DAC,
pulse-shaping 鏗乴ter and line driver
Supports operation from 160 to 416
kbps
Capable of transceiving over the ANSI
T1.601 and ETSI ETR 080 ISDN
test loops
Flexible Monitoring and Control
鈥?Glueless interface to Intel 8051 and
Motorola 68302 processors
鈥?Access to embedded 鏗乴ters, perfor-
mance meters and timers
Backwards compatible with Bt8952
software API commands
JTAG/IEEE Std 1149.1-1990
compliant
Single +5 V power supply
operation
600 mW power consumption at 288
kbps (typical)
100-pin PQFP package
鈥?0藲C to +85藲C operation
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Functional Block Diagram
鈥?/div>
鈥?/div>
Analog
Receive
Variable
Gain
Ampli鏗乪r
Analog-
to-Digital
Converter
Digital
Signal
Processor
Recovered
Data and
Clock
鈥?/div>
鈥?/div>
鈥?/div>
MPU
Bus
Microcomputer
Interface
Program-
mable
Gain
DAC
Framer/
Channel
Unit
Interface
Applications
Transmit
Data
Analog
Transmit
Line
Driver
Pulse-
Shaping
Filter
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Voice/data pairgain systems
Internet connectivity
ISDN basic-rate interface
concentrators
ISDN H0 transport
Extended range fractional T1/E1
Cellular/microcellular base stations
Personal Communications Systems
(PCS) radio ports and cell switches

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