Instrukcja obsługi Microchip SY88343BL


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SY88343BL
3.3V, 3.2Gbps CML Limiting Post Amplifier
with High Gain TTL Loss-of Signal-
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944 0800 • fax + 1 (408) 474 1000 • http://www.micrel.com- -
February 2007
M9999 02170- 7-B
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88343BL low-power limiting post amplifier is
designed for use in fiber optic receivers. The device -
connects to typical transimpedance amplifiers (TIAs)
that are AC coupled. The linear signal output from TIAs -
can contain significant amounts of noise and may vary
in amplitude over time. The SY88343BL quantizes these
signals and outputs CML-level waveforms.
The SY88343BL operates from a single +3.3V power
supply, over temperatures ranging from –40oC to +85oC.
With its wide bandwidth and high gain, signals with data
rates up to 3.2Gbps and as small as 5mVPP can be
amplified to drive devices with CML inputs or AC-
coupled CML/PECL inputs.
The SY88343BL generates a high-gain loss-of signal -
(LOS) open collector TTL output. The LOS function- has
a high gain input stage for increased sensitivity. A
programmable loss signal level set pin-of- (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 signal condition. -of-
Typically, 3.5dB LOS hysteresis is provided to prevent
chattering.
Datasheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
Single 3.3V power supply
DC to 3.2Gbps operation
- Low noise CML data outputs
High gain LOS
- - - -Chatter free Open Collector TTL Loss of Signal
(LOS) output with internal 4.75k up resistor pull-
TTL /EN input
Programmable LOS level set (LOSLVL )
- Ideal for multi rate applications
- - -Available in a tiny 10 pin EPAD MSOP and 16 pin
QFN package
Applications
APON, BPON, EPON, and GPON
Gigabit Ethernet
Fibre Channel
- - OC 3 and OC 12/24 SONET/SDH
- High gain line driver and line receiver
Markets
FTTP
Optical transceivers
Datacom/Telecom
- Low gain TIA interface
Long reach FOM
Micrel, Inc.
SY88343BL
February 2007 2 M9999 021707- -B
hbwhelp@micrel.com or (408) 955-1690
Typical Application
Pin Configuration
10 2)- - -Pin EPAD MSOP (K10
16-Pin QFN
Ordering Information
Part Number Package
Type
Operating
Range Package Marking Lead
Finish
SY88343BLEY K10-2 Industrial 343B with Pb Free bar line indicator- -Sn Matte
SY88343BLEYTR(1) K10-2 l Industria 343B with Pb Free bar line indicator- Matte-Sn
SY88343BLMG 16 -QFN Industrial 343B with Pb Free bar line indicator- NiPdAu
Pb-Free
SY88343BLMGTR(1) - -QFN 16 Industrial 343B with Pb Free bar line indicator NiPdAu
Pb-Free
Note:
1. Tape and Reel.
Micrel, Inc.
SY88343BL
February 2007 3 M9999 021707- -B
hbwhelp@micrel.com or (408) 955-1690
Pin Description
Pin Number
MSOP
Pin Number
QFN Pin Name Type Pin Function
1 /EN 15 TTL Input: Default
is HIGH.
/Enable: This input enables the outputs when it is LOW.
Note that this input is internally connected to a 25kΩ pull-
up resistor and will default to logic HIGH state if left
open.
2 1 DIN Data Input True data input.
3 4 /DIN Data Input Complementary data input.
4 6 VREF Reference Voltage: Bypass with 0.01µF low ESR
capacitor from VREF to VCC to stabilize LOSLVL and VREF.
5 LOSLVL 14 Input
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.
6 2, 3,
10, 11
GND,
Exposed
Pad
Ground Device ground. GND and Exposed pad are to be tied to
the same ground plane.
7 7 LOS
Open-collector
TTL output
w/internal 4.75k
pull-down resistor
Loss of- -Signal: asserts high when the data input
amplitude falls below the threshold set by LOSLVL.
8 9 /DOUT CML Output Complementary data output.
9 12 DOUT CML Output True data output.
10 5, 8,
13, 16 VCC Power Supply Positive power supply.


Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY88343BL

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