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PE-69016 Datasheet Preview

PE-69016 Datasheet

(PE-69016 / PE-68517L) LAN Transceiver

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FASTPULSE MediaCAT
HIGH SPEED LAN TRANSCEIVERS
Twisted pair transceiver kit for TP-FDDI,
100BaseTX and ATM 155 Mbps
Matched integrated circuit and magnetic
module
Flexible, cost-effective frontend solution
Part
Number
Description
Application
General Description
PE-95000
PE-95010
PE-68517L
PE-69016
Transceiver IC
Transceiver IC
Magnetic Module
Magnetic Module
100Base-TX & TP-FDDI
ATM 155 Mbps
100Base-TX
ATM 155 Mbps
TP-FDDI
100Base-TX
FASTPULSE MediaCAT (Chip And Transformer) is a transceiver
component kit which enables the design of high performance, low-
cost frontends for high speed LAN products. MediaCAT consists of
Features
High performance twisted pair transceiver solution
a monolithic twisted pair transceiver which implements the core Flexible frontend kit for 100Base-TX, ATM 155 & TP-FDDI
Transmit/Receive signal processing and a matched magnetic mod-
ule which provides the wideband transformer coupling and EMI
filtering. The MediaCAT transceiver forms the analog interface
Full compliance with PMD standards IEEE, ANSI and ATM
Supports 100m of Unshielded Twisted Pair (UTP), Category 5 DataShee
between the digital PHY controller and the twisted pair cable
or Shielded Twisted Pair (STP) cable
(UTP-5 or STP). The matched nature of the devices anDdaptraoSvehneet4U.com
performance reduces the design effort and risk of implementing
100 Mbps+ frontends.
Employing FASTPULSE technology, the MediaCAT transceiver
PE-95000/10 incorporates transmit conditioning, receiver adaptive
equalization to compensate for cable losses and baseline restora-
tion to correct DC drifts in receiver datastream. The two key
MediaCAT IC
• Integrates high performance and programmable adaptive
equalizer
Integrates compliant base line wander correction circuitry
Versions for MLT3 and binary operation
encode/decode schemes which the ICs can implement are MLT3
(PE-95000) and Binary (PE-95010). MLT3 is a three level coding
scheme which is used in TP-FDDI and 100Base-TX applications to
support 125 Mbaud (100 Mbps) data transmission over 100 m of
Programmable drive current
Direct interface to PHY controllers
EMC optimized design — edge rate control, CMRR
shielded (STP) or unshielded twisted pair (UTP) Category 5 cable BiCMOS device/PLCC28 package
(2 pair). Binary coding (NRZ) is used principaly for
ATM 155 Mbps applications, to support 155 Mbps transmission
over 100 m STP or UTP Category 5 cable. The device has
a high degree of flexibility to allow it to be used in various standard
MediaCAT Magnetics
Integrated transformer/choke device — tuned to MediaCAT IC
applications and to enable performance tailoring for customer
specific requirements.
Provides TX/RX wide bandwidth isolation and EMI filtering
SMD package for IR reflow compatibility
The PE-68517L is an integrated magnetic module device designed
for TP-FDDI, 10/100Base-TX and ATM155 Mbps applcations. It Applications
provides a balanced, wideband transformer with dual common
mode chokes to minimize EMI emissions. The device charac-
teristics are tuned to the MediaCAT transceiver resulting in an
Network adapter cards (ISA, PCI, VME etc.)
Hubs or concentrators
optimized device pair. For certain 10/100 Mbps applications the
PE-69016 provides the 10 Mbps and 100 Mbps magnetic interface
with integrated passive mixer.
MediaCAT devices meet or exceed the electrical specifications of
the following standards: ANSI X3.263 TP-PMD for TP-FDDI, IEEE
Motherboards (PC, workstation, industrial)
Bridges, routers, switches
Switch uplink modules
Point to point links (Telecom)
802.3u for Fast Ethernet 100Base-TX and ATM-UNI-PMD STS3c Peripherals: storage, print servers, etc.
for ATM 155 Mbps applications.
DataSheet4U.com
U.S.A: TEL 619 674 8100 EUROPE: TEL 44 1483 401700 ASIA: TEL 886 7 821 3141 WEB: http://www.pulseeng.com
DataSheet4 U .com
1 H335.A (9/97)
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Valor Electronics

PE-69016 Datasheet Preview

PE-69016 Datasheet

(PE-69016 / PE-68517L) LAN Transceiver

No Preview Available !

www.DataSheet4U.com
FASTPULSE MediaCAT
Block Diagram
RDP
RDN
CPEAK
BASELINE
RESTORATION
DECODER
PEAK
DETECTER
ADAPTIVE
EQUALIZER
RXP
RXN
RD+
RD-
EQGAIN
CT
RX+
RX-
CT
SDP
CDEL
TDP
TDN
SIGNAL
DETECT
ENCODER
REFERENCE
CIRCUIT
TRANSMIT
AMPLIFIER
EQREF
TXP
TXN
CT
TD+
TD-
CMT
TX+
TX-
PE-95000 / PE-95010
PE-68517L
et4U.com
VDD
Functional Description
ENCSEL
TXREF
VSS
DataSheet4U.com
DataShee
The transmitter inputs (TDP, TDN) receive a differential data
stream at pseudo ECL levels from the physical layer controller.
The signal is fed to an encoder which converts the binary data
(NRZI) to MLT3 format, or passes it through unencoded, (NRZ-
NRZ) depending on the setting of the ENCSEL pin (see Fig. 2).
The signal is then fed to a current output driver whose maximum
signal amplitude is controlled by an external resistor at TXREF.
The differential current output at TXP, TXN drives the cable via
the transformer/Choke module. The pull-up resistors for transmit
outputs effectively form the line termination for the cable (Zcable/2
since transformer is 1:1). The wide band transformers provide the
high voltage isolation and exhibit a high inductance in order to
minimize signal droop in presence of DC bias, i.e baseline shift.
The dual common mode chokes and further decoupling schemes
ensure minimal EMI emissions.
In the receive channel, the incoming differential signal from the
cable passes through the transformer/choke before being termi-
nated and fed to the RXP/RXN inputs of the IC. The termination is
performed by the pull-up resistors (Zcable/2). The core function of
the receiver circuitry is the adaptive equalizer which compensates
for the cable losses.
This attenuation and phase distortion will vary with frequency and
cable length. These cable characteristics are defined by EIA/TIA
568 standard — Figure 1 shows typical UTP-5 cable attenuation
curves which incorporate “real world” connector and punch-down
block contributions, as well as typical equalizer response curve to
compensate for these losses. The equalizer transfer function of
PE-95000/10 is fully controlled by external components resulting
in a low cost and flexible architecture. The application circuit
DataSheet4U.com
section details the filters required (at REQP/REQPN,
ZEPQ/ZEQPN and ZEQP2/ZEQPN2 pins) for standard applica-
tions over standard twisted pair cable. The effect of the external
filter networks on the signal is varied from zero to full compensa-
tion by a feedback loop which senses the incoming amplitude
(with peak detector) and optimizes the applied equalization.
The equalized signal is fed to the decoding circuit which converts
the analog signal to a digital PECL datastream, converting from
MLT3 or NRZ waveforms as selected by the ENCSEL pin. The
baseline restoration loop compensates for baseline wander i.e DC
drifts in incoming signal which may occur due to data pattern
dependent DC shifts and the inherent low frequency bandwidth of
the channel and AC coupling transformers. If not corrected this
baseline wander effect can cause degradation in signal/noise ratio
and furthermore, result in data errors/link failure. The feedback
loop compares the incoming equalized signal with a reconstructed
reference. The difference is filtered and used to effect low fre-
quency compensation in order to maintain the equalized signal at
the reference level. The filter characteristic is determined by the
external capacitor at COFF. Its value has been chosen to remove
disruptive high frequency components while allowing the circuit to
track baseline changes limited by the time constant of the trans-
formers. The receiver outputs are then driven out by PECL buffers
to be connected to physical layer controller.
The signal detect circuit monitors the gain control to give a reliable
indication of the presence of a valid equalized signal in accor-
dance with the TP-PMD specification.
U.S.A: TEL 619 674 8100 EUROPE: TEL 44 1483 401700 ASIA: TEL 886 7 821 3141 WEB: http://www.pulseeng.com
H335.A (9/97)
DataSheet4 U .com
2 DataSheet4U.com


Part Number PE-69016
Description (PE-69016 / PE-68517L) LAN Transceiver
Maker Valor Electronics
PDF Download

PE-69016 Datasheet PDF






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