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PDF SY88913V Data sheet ( Hoja de datos )
| Número de pieza | SY88913V | |
| Descripción | HIGH-SPEED LIMITING POST AMPLIFIER | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SY88913V (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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Micrel, Inc.
5V/3.3V 1.25Gbps HIGH-SPEED
LIMITING POST AMPLIFIER
SY88913V
SY88913V
FEATURES
s 3.3V and 5V power supply options
s Up to 1.5Gbps operation
s Low power
s Low noise
s Chatter-Free /LOS Generation
s PECL /LOS Output
s TTL /EN Input
s Differential PECL inputs for data
s /EN input is TTL with internal 27K pull up
s Single power supply
s Designed for use with Micrel-Synergy laser diode
driver and controller
s Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88913V limiting post amplifier with its high gain
and wide bandwidth is ideal for use as a post amplifier in
fiber-optic receivers with data rates up to 1.5Gbps.
Signals as small as 5mVp-p can be amplified to drive
devices with PECL inputs. The SY88913V generates a
chatter-free PECL Loss of Signal (/LOS) output.
The SY88913V incorporates a programmble level
detect function to identify when the input signal has been
lost. This information can be fed back to the /EN input of
the device to maintain stability under loss of signal
conditions. Using LOSLVL pin the sensitivity of the level
detect can be adjusted. The LOSLVL voltage can be set
by connecting a resistor divider between VCC and VREF,
Figure 2. Figure 3 and 4 show the relationship between
input level sensitivity and the voltage set on LOSLVL.
APPLICATIONS
s 1.25Gbps Gigabit Ethernet
s 531Mbps and 1062Mbps Fibre Channel
s 622Mbpswww.DataSheet4U.com SONET
s Gigabit Interface Converter
BLOCK DIAGRAM
DIN
/DIN
VREF
VCC
GND
Limiting
Amplifer
LOSLVL
ECL
Buffer
Enable
DOUT
/DOUT
/EN
Level
Detect
LOS
M9999-081505
[email protected] or (408) 955-1690
1
Rev.: C Amendment: /0
Issue Date: August 2005
1 page  
Micrel, Inc.
SY88913V
APPLICATION NOTE
Output Termination
The SY88913V outputs must be terminated with a 50Ω
load to VCC –2V (or Thevenin equivalent).
Layout and PCB Design
Since the SY88913V is a high-frequency component,
performance can largely be determined by board layout
and design. A common problem with high-gain amplifiers is
feedback from the large swing outputs to the input via the
power supply.
The SY88913V ground pin should be connected to the
circuit board ground. Use multiple PCB vias close to the
part to connect to ground. Avoid long, inductive runs which
can degrade performance.
0.1µF
0.1µF
DIN+
DIN–
50Ω
0.1µF
50Ω
VREF
VCC
R1
R2
LOSLVL
VREF
Figure 1. Differential Input Configuration
Figure 2. LOS Circuit
LVL
Notes:
LOSLVL =
VCC
–1.32 +
R2 × 1.32
R1 + R2
R1 + R2 ≥ 5kΩ
M9999-081505
[email protected] or (408) 955-1690
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SY88913V.PDF ] | |
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