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5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER
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 4mVp-p 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.
PIN CONFIGURATION
/EN 1 DIN 2 /DIN 3 VREF 4 LOSLVL 5 MSOP K10-1 10 VCC 9 DOUT 8 /DOUT 7 LOS 6 GND
BLOCK DIAGRAM
DIN
Limiting Amplifer CML Buffer
DOUT DOUT
DIN VREF
Enable
VCC GND
Level Detect
EN
APPLICATIONS
s s s s s 1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit interface converter 2.5Gbps SDH/SONET
LOSLVL LOS
Rev.: A
Amendment: /1
1
Issue Date: July 2000
Micrel
SY88993V
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.
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.
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Micrel
SY88993V
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 Current 5V 3.3V LOW-0.3(8) Min. -- -- -- -- -- -- VREF -- Max. 40 35 -0.3(6) 20(4) 100(5) 100 VCC 0.5 TA = 0C Min. -- -- -- -- -- -- VREF -- Max. 40 35 -0.3(6) 20(4) 100(5) 100 VCC 0.5 Min. -- -- -- -- -- -- VREF -- TA = +25C Typ. 34 30 -- -- -- -- -- -- Max. 40 35 -0.3(8) 20(4) 100(5) 100 VCC 0.5 TA = +85C Min. -- -- -- -- -- -- VREF -- Max. 45 40 mA 20(4) 100(5) 100 VCC 0.5 uA V V V V V mV V A Unit mA mA
/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
VCC -1.38 VCC -1.26 VCC -1.38 2.0 -- -- -- -- 80 2.0 0.8 -- GND2
VCC -1.26 VCC -1.38 -- -- 80 VCC-0.2 2.0 0.8 -- GND2
VCC -1.32 VCC -1.26 VCC -1.38 VCC -1.26 -- -- 10 -- -- 80 VCC-0.2 2.0 0.8 -- GND2 -- -- 80 VCC-0.2
VOFFSET Differential Output Offset VCMR Common Mode Range
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
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Micrel
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 Parameter LOS Hysteresis Power Rejection Ratio Supply(1) 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 mVp-p mVp-p mVp-p
LOS Release Time(2) Minimum Input LOS Release Time(3) Maximum Input LOS Assert Time(2) Differential Output(3) Rise/Fall Time Input Voltage Range Differential Output Voltage Swing(4) LOS Sensitivity Range
Output Spec (DOUT and /DOUT) VOH VOL ZO HIGH Level Output Voltage LOW Level Output(6) Voltage Single-Ended Output(7) Impedance
VCC -20 VCC VCC -20 VCC VCC -140 VCC -20 VCC -280 VCC -5 VCC -200 VCC VCC -140 VCC -20 VCC
mV mV
VCC -280 VCC -140 VCC -280
VCC -280 VCC -140
40
60
40
60
40
50
60
40
60
Input Spec (DIN and /DIN) AV(Diff) Differential Voltage Gain B-3dB S21 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, 1.8Vp-p. 3. With input signal VID > 5mVp-p. 4. Input is a 200MHz square wave, tr < 300ps, 50 load. 5. VID > 5mVp-p. 6. Output levels are based on 50 impedance. If the load impedance is different, the output level will be changed. 7. See output structure.
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Micrel
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
50 VCC VCC
50 50 DOUT /DOUT Z0 = 50 Z0 = 50
50
8mA
GND
ESD STRUCTURE
Figure 2. Differential Output Configuration
22nF DIN
22nF
/DIN
50
VCC
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
PRODUCT ORDERING CODE
Ordering Code SY88993VKC Package Type K10-1 Operating Range Commercial
5
SY88993V
VCC VCC VCC
Laserdiode
Photodiode
VCC
TX_DATA+ TX_DATA- /DIN
DIN
OUT
Laser Module /OUT
RSER
SY88922
/EN GND
VREF RSET
200
200
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
68
RWIN VCCDET
0.1F
GND
0.1F VCC
0.1F
LOS
50 50
RX_DATA+ RX_DATA- DOUT /DOUT
/EN
DIN 22nF From Transimpedance Amp.
SY88993V
LOSLVL VREF
/DIN
22nF
GND
VCC 0.1F
20K 0.1F
Micrel
50
50
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Micrel
SY88993V
PERFORMANCE CURVE
LOS Assert and Deassert Levels vs LOSLVL
100 100
LOS Assert and Deassert Levels vs LOSLVL
INPUT LEVEL (mVp-p)
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
INPUT LEVEL (mVp-p)
90 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
100 100
LOS Assert and Deassert Levels vs LOSLVL
INPUT LEVEL (mVp-p)
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
INPUT LEVEL (mVp-p)
90 80 70 60 50 40 30 20 10 0 0
3.3V TA = 25C 2.5Gbps Pattern 27-1
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC - V (V)
Figure 6.
Figure 7.
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Micrel
SY88993V
10 LEAD MSOP (K10-1)
Rev. 00
MICREL-SYNERGY
TEL
3250 SCOTT BOULEVARD SANTA CLARA CA 95054
FAX
USA
+ 1 (408) 980-9191
+ 1 (408) 914-7878
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated
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