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Micrel, Inc.
5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER
SY88993V
SY88993V
FEATURES
s s s s s s s s s > 3.2Gbps operation 3.3V or 5V power supply option Low noise CML data outputs Chatter-Free LOS generation Open Collector TTL LOS output TTL /EN Input Differential PECL inputs for data Single power supply Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88993V limiting post amplifier with its high and wide bandwidth is ideal for use as a post amplifier in fiberoptic receivers with data rates up to 3.2Gbps. Signals as small as 4mVPP can be amplified to drive devices with CML inputs. The SY88993V generates a chatter-free Loss of Signal (LOS) open collector TTL output. The SY88993V 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.
APPLICATIONS
s s s s s 1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit interface converter 2.5Gbps SDH/SONET
BLOCK DIAGRAM
DIN /DIN VREF VCC GND
Limiting Amplifer
CML Buffer
DOUT /DOUT
Enable
/EN
Level Detect
LOSLVL
LOS
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
Rev.: C
Amendment: /0
1
Issue Date: August 2005
Micrel, Inc.
SY88993V
PACKAGE/ORDERING INFORMATION
Ordering Information
/EN 1 DIN 2 /DIN 3 VREF 4 LOSLVL 5 MSOP K10-1 10 VCC 9 DOUT 8 /DOUT 7 LOS 6 GND
Part Number SY88993VKC SY88993VKCTR(1) SY88993VKG SY88993VKGTR(1)
Package Type K10-1 K10-1 K10-1 K10-1
Operating Range Commercial Commercial Commercial Commercial
Package Marking 993V 993V 993V with Pb-Free bar-line indicator 993V with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
10-Pin MSOP (K10-1)
Note: 1. Tape and Reel.
PIN NAMES
Pin DIN /DIN LOSLVL /EN LOS GND DOUT /DOUT VCC VREF Type Data Input Data Input Input TTL Input TTL Output (Open Collector) Ground CML Output CML Output Power Supply Output Function Data Input Inverting Data Input Loss of Signal Level Set Output Enable (Active Low) Loss of Signal Indicator (Active High) Ground Data Output Inverting Data Output Positive Power Supply Reference Voltage Output for LOS Level Set (see Fig. 3)
GENERAL DESCRIPTION
General The SY88993V is an integrated limiting amplifier intended for high-frequency fiber-optic applications. The circuit connects to typical transimpedance amplifiers found within a fiber-optics link. The linear signal output from a transimpedance amplifier can contain significant amounts of noise, and may vary in amplitude over time. The SY88993V limiting amplifier quantizes the signal and outputs a voltage-limited waveform. The /EN pin allows the user to disable the output signal without removing the input signal.
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88993V
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VCC DIN, /DIN TA Tstore Rating Power Supply Voltage Input Voltage Operating Temperature Range Storage Temperature Range Value 0 to +7.0 0 to VCC -40 to +85 -55 to +125 Unit V V C C
Note: 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
VCC = +3.3V 10% or +5V 10%, RLOAD = 50 to VCC
TA = -40C Symbol ICC IIL IIH IOH LOSLVL VOL VREF VIH VIL Parameter Power Supply Current(1) /EN Input LOW Current /EN Input HIGH Current LOS Output Leakage(2) LOSLVL Level LOS Output Low Level(3) Reference Voltage /EN Input HIGH Voltage /EN Input LOW Voltage 5V 3.3V Min. -- -- -0.3(6) -- -- -- VREF -- Max. 40 35 -- 20(4) 100(5) 100 VCC 0.5 TA = 0C Min. -- -- -0.3(6) -- -- -- VREF -- Max. 40 35 -- 20(4) 100(5) 100 VCC 0.5 Min. -- -- -0.3(6) -- -- -- VREF -- TA = +25C Typ. 34 30 -- -- -- -- -- -- Max. 40 35 -- 20(4) 100(5) 100 VCC 0.5 TA = +85C Min. -- -- -0.3(6) -- -- -- VREF -- Max. 45 40 -- 20(4) 100(5) 100 VCC 0.5 Unit mA mA A uA V V V V V mV V
VCC -1.38 VCC -1.26 VCC -1.38 VCC -1.26 VCC -1.38 VCC -1.32 VCC -1.26 VCC -1.38 VCC -1.26 2.0 -- -- -- -- 80 2.0 0.8 -- -- -- 80 VCC-0.2 2.0 0.8 -- GND2 -- -- 10 -- -- -- 80 VCC-0.2 2.0 0.8 -- -- -- 80
VOFFSET Differential Output Offset VCMR Common Mode Range
GND2 VCC-0.2 GND2
GND2 VCC-0.2
Notes: 1. No output load. 2. VOH = 5.5V. 3. IOL = +2mA. 4. VIN = 2.7V 5. VIN = VCC 6. VIN = 0.5V
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88993V
AC ELECTRICAL CHARACTERISTICS
VCC = +3.3V 10% or +5V 10%, RLOAD = 50 to VCC
TA = -40C Symbol HYS PSRR tOFFL tOFFH tONL tr tf VID VOD VSR VOH VOL ZO Parameter LOS Hysteresis Power Supply(1) Rejection Ratio LOS Release Time(2) Minimum Input LOS Release Time(3) Maximum Input LOS Assert Time(2) Differential Rise/Fall Time Output(3) Min. 2 -- -- -- -- -- 4 -- 4 Max. 8 -- 0.5 0.5 0.5 120 1800 -- 50 2 -- -- -- -- -- 4 -- 4 TA = 0C Min. Max. 8 -- 0.5 0.5 0.5 120 1800 -- 50 Min. 2 -- -- -- -- -- 4 -- 4 TA = +25C Typ. 5.6 35 0.1 0.1 0.2 70 -- 400(5) -- Max. 8 -- 0.5 0.5 0.5 120 1800 -- 50 TA = +85C Min. 2 -- -- -- -- -- 4 -- 4 Max. 8 -- 0.5 0.5 0.5 120 1800 -- 50 Unit dB dB s s s ps mVPP mVPP mVPP mV mV
Input Voltage Range Differential Output Voltage Swing(4) LOS Sensitivity Range
Output Spec (DOUT and /DOUT) Output HIGH Voltage Single-Ended Output(7) Impedance VCC -20 40 VCC 60 VCC -20 40 VCC 60 VCC -20 40 VCC -5 50 VCC 60 VCC -20 40 VCC 60 Output LOW Voltage(6) VCC -280 VCC -140 VCC -280 VCC -140 VCC -280 VCC -200 VCC -140 VCC -280 VCC -140
Input Spec (DIN and /DIN) AV(Diff) B-3dB S21 Differential Voltage Gain 3dB Bandwidth Single-Ended Small Signal-Gain -- -- 26 -- -- -- -- -- 26 -- -- -- -- -- 26 38 2.5 32 -- -- -- -- -- 26 -- -- -- dB GHz dB
Notes: 1. Input referred noise = RMS output noise/low frequency gain. Input referred, 55MHz. 2. Input is a 200MHz square wave, tr < 300ps, 1.8VPP. 3. With input signal VID > 5mVPP. 4. Input is a 200MHz square wave, tr < 300ps, 50 load. 5. VID > 5mVPP. 6. Output levels are based on 50 impedance. If the load impedance is different, the output level will be changed. 7. See output structure.
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88993V
APPLICATION NOTE
Output Termination The SY88993V outputs must be terminated with a 50 load to VCC. Layout and PCB Design Since the SY88993V 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 power supply. The SY88993V 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.
ESD STRUCTURE VCC
VCC
VCC
50
50 DOUT /DOUT
50 Z0 = 50
50
Z0 = 50
8mA
GND
ESD STRUCTURE
Figure 2. Differential Output Configuration
22nF DIN
22nF
/DIN
VCC
50
50
R1 LOSLVL
VREF
R2
GND
0.1F
VREF
Figure 1. Differential Input Configuration NOTES: 1. Resistor Divider = R2/ (R1 + R2) 2. R1 + R2 5k Figure 3. LOSLVL Circuit
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88993V
PERFORMANCE CURVE
LOS Assert and Deassert Levels vs LOSLVL
100 90
INPUT LEVEL (mVp-p) INPUT LEVEL (mVp-p)
LOS Assert and Deassert Levels vs LOSLVL
100 90 80 70 60 50 40 30 20 10 0 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC - V (V) 5.0V TA = 25C 2.5Gbps Pattern 223-1
80 70 60 50 40 30 20 10 0 0
3.3V TA = 25C 2.5Gbps Pattern 223-1
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC - V (V)
Figure 4.
Figure 5.
LOS Assert and Deassert Levels vs LOSLVL
100
INPUT LEVEL (mVp-p) INPUT LEVEL (mVp-p)
LOS Assert and Deassert Levels vs LOSLVL
100 90 80 70 60 50 40 30 20 10 0 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC - V (V) 5.0V TA = 25C 2.5Gbps Pattern 27-1
90 80 70 60 50 40 30 20 10 0
3.3V TA = 25C 2.5Gbps Pattern 27-1
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC - V (V)
Figure 6.
Figure 7.
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
6
SY88993V
VCC VCC VCC
68
Laserdiode
Photodiode
VCC
TX_DATA+ TX_DATA-
200 200
DIN /DIN
OUT
Laser Module /OUT
RSER
SY88922
/EN GND
VREF RSET
20k
APPLICATION EXAMPLE FOR 3-CHIP SET SOLUTION
GBIC Terminal
0.1F VCC IBIAS TX_FAULT TX_DISABLE LOSOUT LOSIN RX_LOS VCC TX_OUT TX_FAULT TX_DISABLE VREF
MD
VCC 2M
SY88904
IPIN SET 20k ILIMIT SET 20k IBIAS SET 20k IBIAS FB
1000pF
68
RWIN VCCDET
0.1F
GND
0.1F VCC
0.1F
LOS
50 50
/EN
RX_DATA+ RX_DATA- DOUT /DOUT DIN 22nF From Transimpedance Amp.
SY88993V
LOSLVL VREF
/DIN
50 50
22nF
GND
VCC 0.1F
20K 0.1F
M9999-082205 hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
7
Micrel, Inc.
SY88993V
10 LEAD MSOP (K10-1)
Rev. 00
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 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. (c) 2005 Micrel, Incorporated. M9999-082205 hbwhelp@micrel.com or (408) 955-1690
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