Instrukcja obsługi Microchip SY88992L

Microchip nieskategoryzowany SY88992L

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SY88992L
3.3V, 4.25Gbps VCSEL Driver
January 2006
M9999 011306- -A
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88992L is a single supply 3.3V, low power
consumption, small form factor VCSEL driver ideal for -
use in datacom applic tions; Ethernet, GbE (Gigabit a
Ethernet), and FC (Fibre Cha nel) applications that n
operate from 100Mbps up to 4.25Gbps. The
modulation cu rent is set by applying an external r
voltage at the IM_SET pin. The driver features an
adjustable peaking option with variable amplitude and
duration to improve VCSEL edge response. The driver
can deliver modulation current up to 25mA and a
peaking cu rent up to 35% of the modulation current. r
This device is intended to be used with Micrel’s
MIC3001 Optical Transceiver Manag ment IC, which e
allows for both modulation and bias current control and
monitoring, APC (Automatic Power Control), and
temperature compensation.
All support documentation can be found on Micrel’s
web site at: www.micrel.com.
Features
• Up to 25mA modulation current
• Operates from 100Mbps to 4.25Gbps
• Peaking with variable duration option for better
VCSEL re sponse
• Dual peaking, on the rise and falling edges
• Peaking current proportional to modulation current
• Easy modulation current setting
• Fully controllable with Micrel MIC3001
• Small (3mm x 3mm) 16 pin QFN package
Applications
• Multirate LAN, SAN applications up to 4.25Gbps:
Ethernet, GbE, FC
• SFF, SFP Modules
Markets
• Datacom
________________________________________________________________
Typical Application
Micrel, Inc.
SY88992L
January 2006 2 M9999 011306- -
A
hbwhelp@micrel.com or (408) 955-1690
Functional Block Diagram
Ordering Information(1)
Part Number Package
Type
Operating
Range
Package Marking Lead Finish
SY88992LMG 16 Indu -QFN s trial 992L with Pb-Free bar line indicator- - NiPdAu Pb Free
SY88992LMGTR
(2)
- s QFN 16 Indu trial 992L with Pb-Free bar line indicator- - NiPdAu Pb Free
Notes:
1. Contact factory for die availability. Dice are guaranteed at T
A = +25°C, DC Electricals only.
2. Tape and Reel.
Pin Conguration
16-Pin QFN
Micrel, Inc.
SY88992L
January 2006 3 M9999 011306- -
A
hbwhelp@micrel.com or (408) 955-1690
Pin Description
Pin Number Pin Name Pin Function
2 DIN+ Non-Inverting Input Data. Internally terminated with 50Ω t to a reference vol age.
3 - DIN Inverting Input Data. Internally terminated with 50 to a reference volΩ tage.
6 IP_SET1 Peaking Current Setting. Connect this pin to GND and keep pins 7 and 8 open to set
peaking- -to modulation current ratio to 5%. Combinations of the three pins, as shown
in table below, will set different ratios up to 35%.
7 IP_SET2 Peaking Current Setting. Connect this pin to GND and keep pins 6 and 8 open to set
peaking- -to modulation current ratio to 10%. Combinations of the three pins, as shown
in table below, will set different ratios up to 35%.
8 IP_SET3 Peaking Current Setting. Connect this pin to GND and keep pins 6 and 7 open to set
peaking- -to modulation current ratio to 20%. Combinations of the three pins, as shown
in table below, will set different ratios up to 35%.
10 - MOD Inverted Modulation Current Output. Provides modulation current when input data is
nega tive.
11 -MOD+ Non Inverted Modulation Current Output. Provides modulation current when input
data is positive.
13 Modulatio IM_SET n Current Setting. The modulation current is set by applying a 0V to 1.2V
voltage at this pin.
14 IPD_SET Peaking Duration Setting. The peaking current duration is set by installing a resistor
between this pin and ground. The plot on page 6 shows peaking duration versus the
value of the resistor installed.
16 /EN A low level signal applied to this pin will enable the output stage of the driver.
Internally pulled down to ground with 75kΩ resistor.
1, 4, 9, 12 GND Ground. Ground and exposed pad must be connected to the plane of the most
negative potential.
5, 15 Supply Voltage. Bypass with a 0.1µF//0.01µF low ESR capacitor as close to VCC pin VCC
as possible.
Truth Table
DIN+ DIN - /EN MOD+
(1)
MOD- VCSEL Output
L H L H L L
H L L L H H
X X H H H L
Notes:
1. IMOD = 0 when MOD+ = H.
2. Assuming a common anode VCSEL with its cathode tied to MOD+.
Peaking Current-to-Modulation Current Ratio Setting
IP/IMOD 0 % 5 % 10 % 15 % 20 % 25 % 30 % 35 %
IP_SET1 NC NC NC NC GND GND GND GND
IP_SET2 NC NC ND NC NC G GND GND GND
IP_SET3 NC NC NC NC GND GND GND GND

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY88992L

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