ML6695 Datasheet, PDF (1/8 Pages) Micro Linear Corporation – 100BASE-X Fiber Physical Layer With 5-bit Interface

December 1998
PRELIMINARY
ML6695
100BASE-X Fiber Physical Layer With 5-bit Interface
GENERAL DESCRIPTION
The ML6695 implements the physical layer of the Fast
Ethernet 100BASE-X standard for fiber media. The device
provides the 5-bit (or symbol) interface for interface to
upper-layer silicon. The ML6695 integrates the data
quantizer and the LED driver, allowing the use of low cost
optical PMD components.
The ML6695 includes 125MHz clock recovery/clock
generation, an LED driver, and a data quantizer (post
amplifier). The device also offers a power down mode
which results in total power consumption of less than 20mA.
The ML6695 is suitable for the current 100BASE-FX IEEE
803.2u standard defined using 1300nm optics, as well as
for the proposed 100BASE-SX standard defined using lower
cost 820nm optics.
FEATURES
s 100BASE-FX physical layer with 5-bit interface
s Optimal 100BASE-SX solution (draft standard)
s Integrated data quantizer (post-amplifier)
s Integrated LED driver
s 125MHz clock generation and recovery
s Power-down mode
BLOCK DIAGRAM
TXC
TSM4
TSM3
TSM2
TSM1
TSM0
SDO
RXC
RSM4
RSM3
RSM2
RSM1
RSM0
CLOCK
SYNTHESIZER
SERIALIZER
NRZ TO NRZI
ENCODER
LED
DRIVER
LPBK
PWRDN
IOUT
IOUT
RTSET
DESERIALIZER
SIGNAL
DETECT
CLOCK & DATA
RECOVERY
NRZI TO NRZ
DECODER
DATA QUANTIZER
(POST AMPLIFIER)
VIN+
VIN–
CAPB CAPDC
1