ADM6996L-AA-T-1 Lantiq, ADM6996L-AA-T-1 Datasheet - Page 19

• Manufacturer Part Number: ADM6996L-AA-T-1
• Manufacturer: Lantiq

Specifications of ADM6996L-AA-T-1

• Lead Free Status / RoHS Status: Supplier Unconfirmed

3.5.1
The ADM6996L/LX 100Base-TX transmission driver implements MLT-3 translation and wave-shaping functions.
The rise/fall time of the output signal is closely controlled to conform to the target range as specified in the ANSI
TP-PMD standard.
3.5.2
For 100Base-TX operation, the incoming signal is detected by the on-chip twisted-pair receiver that consists of a
differential line receiver, an adaptive equalizer and a base-line wander compensation circuits.
The ADM6996L/LX uses an adaptive equalizer that changes filter frequency response in accordance with cable
length. The cable length is estimated based on the incoming signal strength. The equalizer tunes itself
automatically for any cable length to compensate for the amplitude and phase distortions incurred from the cable.
3.6
The 10Base-T Transceiver Module is IEEE 802.3 compliant. It includes the receiver, transmitter, collision,
heartbeat, loop back, jabber, wave shaper, and link integrity functions, as defined in the standard. Figure 3
provides an overview for the 10Base-T module.
The ADM6996L/LX 10Base-T module is comprised of the following functional blocks:
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3.6.1
The ADM6996L/LX 10Base-T module is capable of operating in either half-duplex mode or full-duplex mode. In
half-duplex mode, the ADM6996L/LX functions as an IEEE 802.3 compliant transceiver with fully integrated
filtering. The COL signal is asserted during collisions or jabber events, and the CRS signal is asserted during
transmit and receive. In full duplex mode the ADM6996L/LX can simultaneously transmit and receive data.
3.6.2
Data encoding and transmission begins when the transmission enable input (TXEN) goes high and continues as
long as the transceiver is in a good link state. Transmission ends when the transmission enable input goes low.
The last transition occurs at the center of the bit cell if the last bit is a 1
bit is 0
Decoding is accomplished using a differential input receiver circuit and a phase-locked loop that separate the
Manchester-encoded data stream into clock signals and NRZ data. The decoder detects the end of a frame when
no more mid bit transitions are detected. Within one and a half bit times after the last bit, carrier sense is de-
asserted.
3.6.3
The ADM6996L/LX integrates all the required signal conditioning functions in its 10Base-T block such that external
filters are not required. Only one isolation transformer and impedance matching resistors are needed for the
10Base-T transmit and receive interface. The internal transmit filtering ensures that all the harmonics in the
transmission signal are attenuated properly.
Data Sheet
Manchester encoder and decoder
Collision detector
Link test function
Transmit driver and receiver
Serial and parallel interface
Jabber and SQE test functions
Polarity detection and correction
B
.
Transmit Drivers
Twisted-Pair Receiver
10Base-T Module
Operation Modes
Manchester Encoder/Decoder
Transmit Driver and Receiver
19
B
, or at the boundary of the bit cell if the last
Function Description
Rev. 1.13, 2005-11-22
ADM6996L/LX
Data Sheet