SY88289ALMG

SY88289ALMG Datasheet

SY88289AL

Part	Datasheet
SY88289ALMG	SY88289ALMG (pdf)

Related Parts	Information
SY88289ALMG-TR	SY88289ALMG-TR

PDF Datasheet Preview
SY88289AL 3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier with TTL Loss-of-Signal The SY88289AL low-power limiting post amplifier is designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers TIAs . The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88289AL quantizes these signals and outputs CML-level waveforms. The SY88289AL operates from a single +3.3V power supply, over temperatures ranging from to +85oC. With its wide bandwidth and high gain, signals with data rates up to 3.2Gbps, and as small as 10mVP-P, can be amplified to drive devices with CML inputs or ACcoupled CML/PECL inputs. The SY88289AL generates a loss-of-signal LOS opencollector TTL output. A programmable loss-of-signal level-set pin LOSLVL sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. The enable bar 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 maintain output stability under a loss-of-signal condition. Typically, 3.5dB LOS hysteresis is provided to prevent chattering. All support documentation can be found on Micrel’s web site at • Single 3.3V power supply • 125Mbps to 3.2Gbps operation • Low-noise CML data outputs • Chatter-free open-collector TTL Loss-of-signal LOS output with internal pull-up resistor • TTL /EN input • Internal input termination • Programmable LOS level set LOSLVL • Ideal for multi-rate applications • Available in a tiny 3mmx3mm 16-pin QFN package • APON, BPON, EPON, GEPON, and GPON • Gigabit Ethernet • Fibre Channel • SONET/SDH:OC-3/12/24/48 STM 1/4/8/16 • High-gain line driver and line receiver Markets • Optical transceivers • Datacom/telecom Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 408 944-0800 • fax + 1 408 474-1000 • February 2007 M9999-021207-B or 408 955-1690 Micrel, Inc. Ordering Information Package Type SY88289ALMG QFN-16 SY88289ALMGTR 1 QFN-16 Operating Range Industrial Industrial Note Tape and Reel. Pin Configuration Package Marking 289A with Pb-Free bar line indicator 289A with Pb-Free bar line indicator SY88289AL Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free 16-Pin QFN Pin Description Pin Number Pin Name 1, 12 /DIN VREF LOSLVL 7, 14, 15, 16 8 N/C LOS /DOUT DOUT Type Power Supply Data Input Data Input Ground Input Open-collector TTL output w/internal pull-up resistor CML Output CML Output TTL Input Default is HIGH. Pin Function Positive power supply. True data input. Complementary data input. Device ground. Reference voltage Placing a capacitor here to VCC helps stabilize LOSLVL. Loss-of-signal Level Set a resistor from this pin to VCC sets the threshold for the data input amplitude at which LOS will be asserted. No connect. Loss-of-signal asserts high when the data input amplitude rises below the threshold sets by LOSLVL. Complementary data output. True data output. /Enable This input enables the outputs when it is LOW. Note that this input is internally connected to a pull-up resistor and will default to a logic HIGH state if left open. February 2007 M9999-021207-B or 408 955-1690 Micrel, Inc. Absolute Maximum Ratings 1

PDF Datasheet Preview

SY88289AL
3.3V, 3.2Gbps CML Low-Power Limiting Post Amplifier with TTL Loss-of-Signal

The SY88289AL low-power limiting post amplifier is designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers TIAs . The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88289AL quantizes these signals and outputs CML-level waveforms.

The SY88289AL operates from a single +3.3V power supply, over temperatures ranging from to +85oC. With its wide bandwidth and high gain, signals with data rates up to 3.2Gbps, and as small as 10mVP-P, can be amplified to drive devices with CML inputs or ACcoupled CML/PECL inputs.

The SY88289AL generates a loss-of-signal LOS opencollector TTL output. A programmable loss-of-signal level-set pin LOSLVL sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. The enable bar 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 maintain output stability under a loss-of-signal condition. Typically, 3.5dB LOS hysteresis is provided to prevent chattering.

All support documentation can be found on Micrel’s web site at
• Single 3.3V power supply
• 125Mbps to 3.2Gbps operation
• Low-noise CML data outputs
• Chatter-free open-collector TTL Loss-of-signal LOS
output with internal pull-up resistor
• TTL /EN input
• Internal input termination
• Programmable LOS level set LOSLVL
• Ideal for multi-rate applications
• Available in a tiny 3mmx3mm 16-pin QFN package
• APON, BPON, EPON, GEPON, and GPON
• Gigabit Ethernet
• Fibre Channel
• SONET/SDH:OC-3/12/24/48 STM 1/4/8/16
• High-gain line driver and line receiver

Markets
• Optical transceivers
• Datacom/telecom

Micrel Inc.
• 2180 Fortune Drive
• San Jose, CA 95131
• USA
• tel +1 408 944-0800
• fax + 1 408 474-1000
•

February 2007

M9999-021207-B or 408 955-1690

Micrel, Inc.
Ordering Information

Package Type

SY88289ALMG

QFN-16

SY88289ALMGTR 1

QFN-16

Operating Range Industrial

Industrial

Note Tape and Reel.

Pin Configuration

Package Marking
289A with Pb-Free bar line indicator
289A with Pb-Free bar line indicator

SY88289AL

Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free
16-Pin QFN

Pin Description

Pin Number

Pin Name
1, 12
/DIN

VREF

LOSLVL
7, 14, 15, 16 8

N/C LOS
/DOUT

DOUT

Type Power Supply

Data Input Data Input

Ground

Input

Open-collector TTL output w/internal
pull-up resistor CML Output CML Output

TTL Input Default is HIGH.

Pin Function Positive power supply. True data input. Complementary data input. Device ground. Reference voltage Placing a capacitor here to VCC helps stabilize LOSLVL. Loss-of-signal Level Set a resistor from this pin to VCC sets the threshold for the data input amplitude at which LOS will be asserted. No connect. Loss-of-signal asserts high when the data input amplitude rises below the threshold sets by LOSLVL.

Complementary data output. True data output. /Enable This input enables the outputs when it is LOW. Note that this input is internally connected to a pull-up resistor and will default to a logic HIGH state if left open.

February 2007

M9999-021207-B
or 408 955-1690

Micrel, Inc.

Absolute Maximum Ratings 1

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Datasheet ID: SY88289ALMG 647951