Instrukcja obsługi Microchip SY88353BL

Microchip nieskategoryzowany SY88353BL

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SY88353BL
3.3V, 3.2 Gbps Limiting Post Amplifier with
Programmable Decision Threshold
MLF and MicroLeadFrame are registered trademarks of Amkor Technology.
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
1 M9999-021707-B
hbwhelp@micrel.com or (408) 955-1690
General Description
The SY88353BL limiting post amplifier is designed for
use in fiber-optic receivers, and is specially optimized for
WDM applications where optical amplifiers such as
EDFAs and Raman amplifier are used. The device
connects to typical transimpedance amplifiers (TIAs).
The linear signal from TIAs can contain significant
amounts of noise that is unevenly distributed between
top and bottom rails due to the ASE noise generated by
the optical amplifiers, crosstalk, or non-linear effect in
the fiber. In order to optimize the BER in such noisy
conditions, the decision threshold between bit 1 and bit
0, needs to be moved to the rail that contains less noise.
The SY88353BL features a pin at which an external
voltage can be applied to move the crossing point up
and down, from 20% to 80%, for BER optimization
purposes.
The SY88353BL operates from a single +3.3V power
supply, over temperatures ranging from –40
o
C to +85
o
C.
Signals with data rates from 155Mbps up to 3.2Gbps,
and as small as10mV
pp
, can be amplified to drive
devices with CML or PECL inputs.
The SY88353L features a Loss-of-Signal (LOS) open-
collector TTL output. A programmable Loss-of-Signal
level set pin (LOS
LVL
) sets the sensitivity of the input
amplitude detection. LOS asserts high if the input
amplitude falls below the threshold sets by LOS
LVL
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, 3.3dB LOS hysteresis is provided to
prevent chattering.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Features
• Single 3.3V power supply
• Fast LOS release/assert
• 155Mbps to 3.2Gbps operation
• Low-noise CML data outputs
• Chatter-free Open-Collector TTL loss-of-signal (LOS)
output
• TTL /EN input
• Programmable LOS level set (LOS
LVL
)
• Programmable Decision Threshold
• Available in a tiny 3mm x 3mm MLF
®
package
Applications
• WDM Systems
• Gigabit Ethernet, 1X and 2X Fibre Channel
• SONET/SDH: OC-3/12/24/48 – STM1/4/8/16
• Low-gain TIA interface
Markets
• Datacom/telecom
• Optical transceiver
Micrel, Inc. SY88353BL
February 2007
2 M9999-021707-B
hbwhelp@micrel.com or (408) 955-1690
Typical Application Circuit
Programmable Decision Threshold
Fixed Decision Threshold
Ordering Information
Part Number Package
Type
Operating
Range
Package Marking Lead
Finish
SY88353BLMG MLF-16 Industrial 353B with Pb-Free bar line indicator NiPdAu
Pb-Free
SY88353BLMGTR
(1)
MLF16 Industrial 353B with Pb-Free bar line indicator NiPdAu
Pb-Free
Note:
1. Tape and Reel.
Pin Configuration
16-Pin MLF
®
(MLF-16)
Micrel, Inc. SY88353BL
February 2007
3 M9999-021707-B
hbwhelp@micrel.com or (408) 955-1690
Pin Description
Pin Number Pin Name Type Pin Function
1 DIN Data Input True data input.
4 /DIN Data Input Complementary data input.
5 VTHN DC Input Tie this pin to pin 6 (VTHREF) and apply a DC voltage on pin 16
(VTHP) for signal crossing adjustment. Connect to ground if no
crossing adjustment is needed.
6 VTHREF 1.25V Reference voltage (referenced to ground) for decision
threshold adjustment.
7 LOS Open-collector TTL
output
Loss-of-Signal: asserts high when the data input amplitude falls
below the threshold set by LOS
LVL
.
9 /DOUT CML Output Complementary data output.
12 DOUT CML Output True data output.
14 LOSLVL Input Loss-of-Signal Level Set. A resistor from this pin to V
CC
sets the
threshold for the data input amplitude at which LOS will be
asserted.
15 /EN 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 a logic HIGH state if left open.
16 VTHP DC Input Apply a DC voltage from 0 to 2.4V to adjust the signal crossing
level when pin 5 (VTHN) is tied to pin 6 (VTHREF). 1.25V sets
the crossing close to 50%. Connect to ground if no crossing
adjustment is needed.
2, 3, 10, 11 GND Ground Device ground.
8, 13 VCC Power Supply Positive power supply.

Specyfikacje produktu

Marka: Microchip
Kategoria: nieskategoryzowany
Model: SY88353BL

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