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PDF SY88973V Data sheet ( Hoja de datos )
| Número de pieza | SY88973V | |
| Descripción | CML LOW-POWER LIMITING POST AMPLIFIER W/TTL LOS | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Micrel, Inc.
3.3V/5V 3.2Gbps CML
LOW-POWER LIMITING
POST AMPLIFIER W/TTL LOS
SY88973V
SY88973V
FEATURES
DESCRIPTION
s Multi-rate up to 3.2Gbps operation
s Wide gain-bandwidth product
• 38dB differential gain
• 2GHz 3dB bandwidth
s Low noise 50Ω CML data outputs
• 800mVPP output swing
• 60ps edge rates
• 5psRMS typ. random jitter
• 15psPP typ. deterministic jitter
s Chatter-free, Loss-of-Signal (LOS) output
• 4.6dB electrical hysteresis
• OC-TTL output with internal 4.75kΩ pull-up
resistor
s Programmable LOS sensitivity using single external
resistor
s Internal 50Ω data input termination
s TTL /EN input allows feedback from LOS
s Wide operating range
• Single 3.3V ±10% or 5V ±10% power supply
• –40°C to +85°C industrial temperature range
s Available in tiny 10-pin EPAD-MSOP and
16-pin MLF™ packages
APPLICATIONS
s 1.25Gbps and 2.5Gbps Gigabit Ethernet
s 1.062Mbps and 2.125Gbps Fibre Channel
s 155Mbps, 622Gbps, 1.25Gbps, and 2.5Gbps SONET/
SDH
s Gigabit interface converter (GBIC)
s Small form factor (SFF) and small form factor
pluggable (SFP) transceivers
s Parallel 10G Ethernet
s High-gain line driver and line receiver
The SY88973V 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 SY88973V
quantizes these signals and outputs typically 800mVPP
voltage-limited waveforms.
The SY88973V operates from a single +3.3V ±10% or
+5V ±10% power supply, over an industrial temperature
range of –40°C to +85°C. With its wide bandwidth and high
gain, signals with data rates up to 3.2Gbps and as small as
10mVPP can be amplified to drive devices with CML inputs
or AC-coupled PECL inputs.
The SY88973V incorporates a loss-of-signal (LOS), open-
collector TTL output with internal 4.75kΩ pull-up resistor. 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. LOS can be fed
back to the enable (/EN) input to maintain output stability
under a loss-of-signal condition. /EN de-asserts the true
output signal without removing the input signal. Typically
4.6dB LOS hysteresis is provided to prevent chattering.
Please see Micrel’s website at www.micrel.com for a
complete selection of optical module ICs. The following table
summarizes the differences between devices in Micrel’s
latest family of Limiting Amplifiers.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Integrated 50Ω
Part Number Input Termination
SY88773V No
SY88823V No
SY88843V Yes
SY88973V Yes
LOS
or SD
LOS
SD
SD
LOS
Active LOW
or HIGH Enable
LOW
HIGH
HIGH
LOW
Table 1. Limiting Amplifiers Selection Guide
TYPICAL PERFORMANCE
3.3V, 25°C, 10mVpp Input
@3.2Gbps 231–1 PRBS, RLOAD = 50Ω to VCC
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
M9999-110905
[email protected] or (408) 955-1690
1
TIME (50ps/div.)
Rev.: C Amendment: /0
Issue Date: November 2005
1 page  
Micrel, Inc.
SY88973V
AC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V or 4.5V to 5.5V, TA = –40°C to +85°C, RLOAD = 50Ω to VCC; typical values at VCC = 3.3V, TA = 25°C.
Symbol
Parameter
Condition
Min Typ Max
Units
PSRR
Power Supply Rejection Ratio
35 dB
tr,tf Output Rise/Fall Time
(20% to 80%)
Note 7
60 120 ps
tJITTER
VID
VOD
HYS
Deterministic
Random
Differential Input Voltage Swing
Differential Output Voltage Swing
LOS Hysteresis
Note 8
3.3V, Note 7
5V, Note 7
Note 9
15 psPP
5 psRMS
10 1800 mVPP
700 800 950 mVPP
700 800 1020 mVPP
2 4.6 8 dB
tOFF
tON
VSR
B–3dB
AV(Diff)
S21
LOS Release Time
LOS Assert Time
LOS Sensitivity Range
–3dB Bandwidth
Differential Voltage Gain
Single-Ended Small-Signal Gain
Note 10
0.1 0.5 µs
0.2 0.5 µs
10 35 mVPP
2.0 GHz
32 38
dB
26 32
dB
Notes:
7. Amplifier in limiting mode. Input is a 200MHz square wave, tr < 300ps.
8. Deterministic jitter measured using 2.488Gbps K28.5 pattern, VID = 10mVPP. Random jitter measured using 2.488Gbps K28.7 pattern, VID = 10mVPP.
9. Electrical signal.
10. This is the detectable range of input amplitudes that can assert LOS. The input amplitude to deassert LOS is 2–8dB higher than the assert ampli-
tude. See “Typical Operating Characteristics” for graphs showing how to choose a particular VLOSLVL or RLOSLVL for a particular LOS assert, and its
associated de-assert, amplitude. If increased LOS sensitivity and hysteresis are required, an application note entitled “Notes on Sensitivity and
Hysteresis in Micrel Post Amplifiers” is available at http://www.micrel.com/product-info/app_hints+notes.shtml.
M9999-110905
[email protected] or (408) 955-1690
5
5 Page 
Micrel, Inc.
16-PIN MicroLEADFRAME™ (MLF-16)
SY88973V
Package
EP- Exposed Pad
Die
CompSide Island
Heat Dissipation
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
VEE
VEE
PCB Thermal Consideration for 16-Pin MLF™ Package
(Always solder, or equivalent, the exposed pad to the PCB)
Package Notes:
1. Package meets Level 2 qualification.
2. All parts are dry-packaged before shipment.
3. Exposed pads must be soldered to a ground for proper thermal management.
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
M9999-110905
[email protected] or (408) 955-1690
11
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