bt8960 Mindspeed Technologies, bt8960 Datasheet

bt8960

Manufacturer Part Number

bt8960

Description

Bt8960, Single-chip 2b1q Transceiver

Manufacturer

Mindspeed Technologies

Datasheet

1.BT8960.pdf (104 pages)

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Single-Chip 2B1Q Transceiver

Bt8960

The Bt8960 is a full-duplex 2B1Q transceiver based on Rockwell’s 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.

needed for a complete 2B1Q transceiver. In the receive portion of the Bt8960, a

variable gain ampliﬁer 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.

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 ﬁlter 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.

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.

Functional Block Diagram

Analog

MPU

The Bt8960 is a highly integrated device that includes all of the active circuitry

In the transmitter, the transmit source and scrambler operation is programma-

Startup and performance monitoring operations are controlled via the micro-

Bus

Ampliﬁer

Variable

Driver

Gain

Line

Microcomputer

Interface

Converter

to-Digital

Shaping

Analog-

Pulse-

Filter

Processor

Program-

Digital

Signal

mable

Gain

DAC

Interface

Channel

Framer/

Unit

Recovered

Data and

Clock

Transmit

Data

Distinguishing Features

• Single-chip 2B1Q transceiver solution

• All 2B1Q transceiver functions inte-

• Supports operation from 160 to 416

• Capable of transceiving over the ANSI

• Flexible Monitoring and Control

• Backwards compatible with Bt8952

• JTAG/IEEE Std 1149.1-1990

• Single +5 V power supply

• 600 mW power consumption at 288

• 100-pin PQFP package

• –40˚C to +85˚C operation

Applications

• Voice/data pairgain systems

• Internet connectivity

• ISDN basic-rate interface

• ISDN H0 transport

• Extended range fractional T1/E1

• Cellular/microcellular base stations

• Personal Communications Systems

grated into a single monolithic device

– Receiver gain control and A/D

– DSP functions including echo

– Programmable gain transmit DAC,

kbps

T1.601 and ETSI ETR 080 ISDN

test loops

– Glueless interface to Intel 8051 and

– Access to embedded ﬁlters, perfor-

software API commands

compliant

operation

kbps (typical)

concentrators

(PCS) radio ports and cell switches

converter

cancellation, equalization, timing

recovery, and symbol detection

pulse-shaping ﬁlter and line driver

Motorola 68302 processors

mance meters and timers

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