sy84113bu Micrel Semiconductor, sy84113bu Datasheet

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sy84113bu

Manufacturer Part Number
sy84113bu
Description
Low Power 2.5v 1.25gbps Limiting Post Amplifier With Ultra Wide Los Range
Manufacturer
Micrel Semiconductor
Datasheet
General Description
The SY84113BU low power limiting post amplifier is
designed for use in fiber-optic optical modules for
multirate applications up to 1.25Gbps. The device
connects to a typical transimpedance amplifier (TIA) and
can produce output signals to CML-level waveforms.
Intended for the GbE and Fibre Channel applications,
the SY84113BU offers a wide LOS range. It is able to
detect input signals for as low as 5mVpp and as high as
100mVpp. The SY84113BU is intended to be used in
AC-coupled input applications.
The SY84113BU generates a Loss-of-Signal (LOS)
open-collector TTL output. A programmable Loss-of-
Signal level set pin (LOS
input amplitude detection. LOS asserts high if the input
amplitude falls below the threshold set by LOS
de-asserts low otherwise. The enable input (/EN) de-
asserts the true output signal without removing the input
signal. The LOS output can be fed back to the /EN input
to implement the squelch function that maintains output
stability under a loss-of-signal condition.
The SY84113BU operates on a single 2.5V power
supply and offers ultra low power consumption. This
device is perfectly suited to meet the stringent power
requirements of the CSFP/SFP/SFF optical modules.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
_________________________________________________________________________________________________________
Typical Application
January 2011
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
LVL
) sets the sensitivity of the
LVL
and
Features
• Ultra wide LOS Range (5mVpp to 100mVpp)
• Single 2.5V power supply
• Ultra low power consumption (55mW typ)
• 125Mbps to 1.25 Gbps operation
• Low-noise CML data outputs
• TTL /EN input
• Programmable LOS level (LOS
• Internal 50Ohm termination
• Available in a tiny 3mm x 3mm QFN package
Applications
• Gigabit Ethernet
• Fibre Channel
• GEPON
Markets
• Datacom/telecom
• Compact SFP/SFF Optical transceiver
• SFP/SFF Optical transceiver
Low Power 2.5V 1.25Gbps Limiting Post
408
Amplifier with Ultra Wide LOS Range
) 944-0800 • fax + 1 (408) 474-1000 •
SY84113BU
hbwhelp@micrel.com
LVL
http://www.micrel.com
)
or (408) 955-1690
M9999-011711-A

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sy84113bu Summary of contents

Page 1

... CML-level waveforms. Intended for the GbE and Fibre Channel applications, the SY84113BU offers a wide LOS range able to detect input signals for as low as 5mVpp and as high as 100mVpp. The SY84113BU is intended to be used in AC-coupled input applications ...

Page 2

... Ordering Information Part Number Package Type SY84113BUMG QFN-16 (1) SY84113BUMGTR QFN-16 Notes: 1. Tape and Reel. Pin Configuration Pin Description Pin Number Pin Name 15 / DIN, /DIN 6 VREF 14 LOSLVL 2, 3, 10, 11, GND EPAD 7 LOS 12, 9 /DOUT, DOUT 5, 8, 13, 16 VCC January 2011 ...

Page 3

Absolute Maximum Ratings Supply Voltage (V ) ....................................... 0V to +4.0V CC Input Voltage (DIN, /DIN) ....................................... Output Current (I ) ............................................... ±25mA OUT EN Voltage ............................................................. Current .......................................... -800µA to +500µA REF LOS Voltage................................................. ...

Page 4

AC Electrical Characteristics V = 2.5 ± 5 –40°C to +85°C, typical values Symbol Parameter Output Rise/Fall Time r f (20% to 80%) t Deterministic JITTER Random V Differential Input Voltage ...

Page 5

Typical Functional Characteristics V = 2.5 ± 5 –40°C to +85°C, typical values Typical Operating Characteristics V = 2.5 ± 5 –40°C to +85°C, typical values LOS Assert/De-Assert ...

Page 6

... SY84113BU outputs in standard 400mV CML output levels. Output Buffer The SY84113BU’s CML output buffer is designed to drive 50Ω lines and is internally terminated with 50Ω to VCC. Figure 3 shows a schematic of the output stage. January 2011 ...

Page 7

Figure 2. Input Structure Figure 4. LOS Output Structure January 2011 Figure 1. VIS and VID Definition Figure 3. Output Structure Figure 5. LOS Note: Recommended value for R 7 Setting Circuit LVL is 15kΩ or less. LOSLVL M9999-011711- hbwhelp@micrel.com ...

Page 8

... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully January 2011 16-Pin (3mm x 3mm) QFN (QFN-16) indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 8 SY84113BU http://www.micrel.com M9999-011711- hbwhelp@micrel.com or (408) 955-1690 nt ...

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