SY88923 2.5Gbps operation noise Chatter-Free generation Open Coll
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2.5Gbps HIGH-SPEED LIMITING POST AMPLIFIER
SY88923
2.5Gbps operation noise Chatter-Free generation Open Collector output Input Differential PECL inputs data Single power supply Designed with SY88922 SY88904 SY88905 Available tiny 10-pin (3mm) MSOP
DESCRIPTION
SY88923 limiting post amplifier with high gain wide bandwidth ideal post amplifier fiber-optic receivers with data rates 2.5Gbps. Signals small 5mVp-p amplified drive devices with PECL inputs. SY88923 generates chatter-free Loss Signal (LOS) open collector output. SY88923 incorporates programmable level detect function identify when input signal been lost. This information back input device maintain stability under loss signal condition. Using LOSLVL pin, sensitivity level detection adjusted. LOSLVL voltage connecting resistor divider between VREF. Figure Figure show relationship between input level sensitivity voltage LOSLVL. Figure shows relationship between input level sensitivity resistor divider ratio. output open collector output that requires pull-up resistor proper operation, Figure
+5.0V SY88923
CONFIGURATION
/DIN VREF LOSLVL MSOP K10-1 DOUT /DOUT
Figure Output with Desired Rise Time
APPLICATIONS
1.25Gbps Gigabit Ethernet 531Mbps 1062Mbps Fibre Channel 622Mbps SONET Gigabit interface converter 2.5Gbps SDH/SONET
BLOCK DIAGRAM
Limiting Amplifer Buffer
DOUT DOUT
VREF
Enable
Level Detect
LOSLVL
Rev.:
Amendment:
Issue Date: July 2000
Micrel
SY88923
NAMES
/DIN /DOUT DOUT VREF Type Data Input Data Input Input Input Output (Open Collector) Ground PECL Output PECL Output Power Supply Output Function Data Input Inverting Data Input Limit Output Enable (Active Low) Loss Signal Indicator (Active High) Ground Inverting Data Output Data Output Positive Power Supply Reference Voltage Output Level (see Fig.
GENERAL DESCRIPTION
General SY88923 integrated limiting amplifier intended high-frequency fiber-optic applications. circuit connects typical transimpedance amplifiers found within fiber-optics link. linear signal output from transimpedance amplifier contain significant amounts noise, vary amplitude over time. SY88923 limiting amplifier quantizes signal outputs voltagelimited waveform. allows user disable output signal without removing input signal.
ABSOLUTE MAXIMUM RATINGS(1)
Symbol DIN, /DIN DOUT, /DOUT Tstore Rating Power Supply Voltage Input Voltage Output Voltage (with load) Operating Temperature Range Storage Temperature Range Value +7.0 -2.5, +0.3 +125 Unit
NOTE: Permanent device damage occur ABSOLUTE MAXIMUM RATINGS exceeded. This stress rating only functional operation implied conditions other than those detailed operational sections this data sheet. Exposure ABSOLUTE MAXIMUM RATlNG conditions extended periods affect device reliability.
Micrel
SY88923
ELECTRICAL CHARACTERISTICS
±10%, RLOAD VCC-2V, -40°C +85°C
-40°C Symbol VCMR Voffset LOSLVL VREF Parameter Power Supply Current(1) Min. -0.3(8) Max. 20(5) 100(6) ±100 Min. -0.3(8) Max. 20(5) 100(6) ±100 Min. -0.3(8) +25°C Typ. Max. 20(5) 100(6) ±100 +85°C Min. -0.3(8) Max. 20(5) 100(6) ±100
VCC-880
Unit
Input Current Input HIGH Current Common Mode Range Differential Output Offset LOSLVL Level(2) Output Output Level(3) Leakage(4)
+2.0 -1.0 +2.0 -1.0 +2.0
-1.0 +2.0 -1.0 VREF
VREF
VCC-1085
VREF
VREF
DOUT /DOUT HIGH Output DOUT /DOUT Output Reference Supply(7) Input HIGH Voltage Input Voltage
VCC-880 VCC-1025 VCC-880 VCC-1025 VCC-955 VCC-880 VCC-1025
VCC-1830 VCC-1555 VCC-1810 VCC-1620 VCC-1810 VCC-1705 VCC-1620 VCC-1810 VCC-1620 VCC-2.625 VCC-2.325 VCC-2.625 VCC-2.325 VCC-2.625 VCC-2.475 VCC-2.325 VCC-2.625 VCC-2.325
NOTES: output load. 223-1 pattern. 2mA. 5.5V.
2.7. =VCC. IREF must limited within -0.8mA (source) 0.4mA (sink). 0.5V.
ELECTRICAL CHARACTERISTICS
±10%, RLOAD -40°C +85°C
-40°C Symbol PSRR tOFFL tOFFH tONL Parameter Power Rejection Ratio Supply(1) Min. Max. 1800 Min. Max. 1800 +25°C Min. Typ. trin,tfin Max. 1800 +85°C Min. Max. Unit Conditions Input referred, 55MHz
Input Voltage Range Output Rise/Fall Time Differential Output Voltage Swing(2) Release Time(3) Minimum Input Release Time(4) Maximum Input Assert Time(3) Sensitivity Range Hysteresis
1800 mVp-p mVp-p 223-1 pattern 100mVp-p 100mVp-p 15mVp-p 5mVp-p
NOTES: Input referred noise output noise/low frequency gain. Input 622MHz square wave.
Input 200MHz square wave, 300ps, 8mVp-p. Input 200MHz square wave, 300ps, 1.8Vp-p.
Micrel
SY88923
DESIGN PROCEDURE
Output Termination SY88923 outputs must terminated with load thevenin equivalent). Layout Design Since SY88923 high-frequency component, performance largely determined board layout design. common problem with high-gain amplifiers feedback from large swing outputs input power supply. SY88923 ground should connected circuit board ground. multiple vias close part connect ground. Avoid long, inductive runs which degrade performance.
PERFORMANCE CURVE
Assert Deassert Levels LOSLVL
100.00 90.00 80.00 70.00
Deassert
Level (mV)
60.00 50.00 40.00 30.00 20.00 10.00
Assert
4.01
4.13
4.26
4.38
4.51
4.63
4.75
4.88
0.95
2.53
2.65
2.77
2.90 3.02
3.14 3.27
LOSLVL
0.1µF 0.1µF
DIN+ DIN- VREF
Figure 223-1 Pattern
0.1µF
100.00 90.00
Assert Deassert Levels Resistor Divide
Figure Differential Input Configuration
80.00 70.00
3.64 3.76
3.39
3.52
3.89
5.00
0.00
Deassert
Level (mV)
60.00 50.00 40.00 30.00 20.00
Assert
LOSLVL VREF
10.00 0.00
0.00 0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
Resistor Divider
Figure 223-1 Pattern
NOTE: Resistor Divider Figure LOSLVL Circut
1.00
SY88923
1000pF
PRODUCT ORDERING CODE
Photodiode
Laserdiode
VREF RSET
Package Type
RSER
BLM21A102S
TX_DATA+
SY88922
TX_DATA-
REXT
Laser Module
ENABLE/DISABLE
APPLICATION EXAMPLE 3-CHIP SOLUTION
GBIC Terminal
IBIAS
IBIAS
value RSER depends Laser Diode.
SY88905
LOSOUT LOSIN
RX_LOS
IBIAS IPIN
SY88923KC
Ordering Code
K10-1
Commercial
Operating Range
VREF
DOUT DOUT
RX_DATA+ RX_DATA-
LOSLVL
0.1µF
0.1µF
VREF
Micrel
SY88923
Micrel
SY88923
LEAD MSOP (K10-1)
Rev.
Micrel
SY88923
Micrel
SY88923
MICREL-SYNERGY
3250 SCOTT BOULEVARD SANTA CLARA 95054
(408) 914-7878
(408) 980-9191
http://www.synergysemi.com http://www.micrel.com
This information believed accurate reliable, however responsibility assumed Micrel infringement patents other rights third parties resulting from use. license granted implication otherwise under patent patent right Micrel Inc. 2000 Micrel Incorporated
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