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5V/3.3V 2.5Gbps HIGH-SPEED LIMITING POST AMPLIFIER
SY88923V
FEATURES
s s s s s s s s s 3.3V and 5V power supply options Up to 2.5Gbps operation Low noise Chatter-Free LOS Generation Open Collector TTL LOS Output TTL /EN Input Differential PECL inputs for data Single power supply Designed for use with (Micrel-Synergy laser diode driver and controller) s Available in a tiny 10-pin (3mm) MSOP
DESCRIPTION
The SY88923V 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 2.5Gbps. Signals as small as 5mVp-p can be amplified to drive devices with PECL inputs. The SY88923V generates a chatter-free Loss of Signal (LOS) open collector TTL output. The SY88923V incorporates a programmable level detect function to identify when the input signal has been lost. The LOS output will change from logic "LOW" to logic "HIGH" when input signal is smaller than the swing set by LOSLVL. This information can be fed back to the EN input of the device to maintain stability under loss of signal condition. Using LOSLVL pin, the sensitivity of the level detection can be adjusted. The LOSLVL voltage can be set by connecting a resistor divider between VCC and VREF show in Figure 3. Figure 4, 5, 6, and 7 show the relationship between input level sensitivity and the voltage set on LOSLVL. The LOS output is a TTL open collector output that requires a pull-up resistor for proper operation, Figure 1.
VCC SY88923V LOS 2k
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
Figure 1. LOS Output with Desired Rise Time
APPLICATIONS
s s s s s s 1.25Gbps and 2.5Gbps Gigabit Ethernet 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel 622Mbps SONET Gigabit Interface Converter 2.5Gbps SDH/SONET 2.5Gbps Proprietary Links
BLOCK DIAGRAM
DIN
Limiting Amplifer ECL Buffer
DOUT /DOUT /EN
/DIN VREF
Enable
VCC GND
Level Detect
LOSLVL
LOS
Rev.: B
Amendment: /0
1
Issue Date: August 2000
Micrel
SY88923V
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 PECL Output PECL Output Power Supply Output Function Data Input Inverting Data Input LOS Limit Set Output Enable (Active Low) Loss of Signal Indicator (Active High) Ground Inverting Data Output Data Output Positive Power Supply Reference Voltage Output for LOS Level Set (see Fig. 3)
GENERAL DESCRIPTION
General The SY88923V is an integrated limiting amplifier intended for high-frequency fiber-optic applications. The circuit connects to typical trans-impedance 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 SY88923V 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 DOUT, /DOUT /EN LOSLVL VREF TA Tstore Rating Power Supply Voltage Input Voltage Output Voltage (with 50 load) Input Voltage Input Voltage Output Voltage Operating Temperature Range Storage Temperature Range Value 0 to +7.0 0 to VCC VCC -2.5 to VCC +0.3 0 to VCC 0 to VCC VCC -2.0 to VCC -40 to +85 -55 to +125 Unit V V V V 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
SY88923V
DC ELECTRICAL CHARACTERISTICS
VCC = +5V 10% or +3.3V 10%, RLOAD = 50 to VCC -2V
TA = -40C Symbol ICC IIL IIH VCMR Voffset LOSLVL VOL IOH VOH VOL VREF IREF VIH VIL Parameter Power Supply Current(1) 5V 3.3V Min. -- -- -0.3(6) -- --
GND +2.0
TA = 0C Min. -- -- -0.3(6) -- --
GND +2.0
TA = +25C Min. -- -- -0.3(6) -- --
GND +2.0
TA = +85C Max. 40 40 -- 20(4) 100(5) VCC 100 VCC 0.5 100 Min. -- -- -0.3(6) -- --
GND +2.0
Max. 40 40 -- 20(4) 100(5) VCC 100 VCC 0.5 100
Max. 40 40 -- 20(4) 100(5) VCC 100 VCC 0.5 100
Typ. 30 28 -- -- -- -- 17 -- -- --
Max. 45 45 -- 20(4) 100(5) VCC 100 VCC 0.5 100
Unit mA mA A V mV V V uA mV mV V mA V V
/EN Input LOW Current /EN Input HIGH Current Common Mode Range Differential Output Offset LOSLVL Level LOS Output Low LOS Output Level(2) Leakage(3)
-- VREF -- --
-- VREF -- --
-- VREF -- --
-- VREF -- --
DOUT and /DOUT HIGH Output DOUT and /DOUT LOW Output Reference Supply VREF Output Current /EN Input HIGH Voltage /EN Input LOW Voltage
VCC -1085 VCC -880 VCC -1025 VCC -880 VCC -1025 VCC -955 VCC -880 VCC -1025 VCC -880 VCC -1830 VCC -1555 VCC -1810 VCC -1620 VCC -1810 VCC -1705 VCC -1620 VCC -1810 VCC -1620 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
-0.8 2.0 --
0.5 -- 0.8
-0.8 2.0 --
0.5 -- 0.8
4. VIN = 2.7V 5. VIN = VCC 6. VIN = 0.5V
-0.8 2.0 --
-- -- --
0.5 -- 0.8
-0.8 2.0 --
0.5 -- 0.8
NOTES: 1. No output load 2. IOL = + 2mA 3. VOH = 5.5V
AC ELECTRICAL CHARACTERISTICS
VCC = +5V 10% or +3.3V 10%, RLOAD = 50 to VCC -2V
TA = -40C Symbol PSRR VID VOD tOFFL tONL tOFFH VSR HYS tr, tf Parameter Power Supply(1) Rejection Ratio Input Voltage Range Differential Output Voltage Swing(2) LOS Release Time(3) Minimum Input LOS Assert Time(3) LOS Release Maximum Input Time(4) Min. -- 5 -- -- -- -- -- 5 2 -- -- Max. -- 1800 -- -- 0.5 0.5 0.5 50 8 175 -- TA = 0C Min. -- 5 -- -- -- -- -- 5 2 -- -- Max. -- 1800 -- -- 0.5 0.5 0.5 50 8 175 -- -- 5 -- -- -- -- -- 5 2 -- -- TA = +25C Min. Typ. 35 -- 700 300 0.1 0.2 0.1 -- 4.6 150 trin,tfin Max. -- 1800 -- -- 0.5 0.5 0.5 50 8 175 -- TA = +85C Min. -- 5 -- -- -- -- -- 5 2 -- -- Max. -- Unit dB Conditions Input referred, 55MHz
1800 mVp-p -- -- 0.5 0.5 0.5 50 8 175 -- mV mV s s s mVp-p dB ps 223-1 pattern 223-1 pattern VID > 100mVp-p VID < 100mVp-p VID = 15mVp-p VID = 5mVp-p
LOS Sensitivity Range LOS Hysteresis Output Rise/Fall Time
NOTES: 1. Input referred noise = RMS output noise/low frequency gain. 2. Input is a 622MHz square wave.
3. Input is a 200MHz square wave, tr < 300ps, 8mVp-p. 4. Input is a 200MHz square wave, tr < 300ps, 1.8Vp-p.
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Micrel
SY88923V
DESIGN PROCEDURE
Output Termination The SY88923V outputs must be terminated with a 50 load to VCC - 2V (or Thevenin equivalent). Layout and PCB Design Since the SY88923V 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 SY88923V 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.
VCC
0.1F 0.1F DIN+
R1
DIN- 50 VREF 0.1F
LOSLVL R2 VREF
50
Figure 2. Differential Input Configuration
Figure 3. LOSLVL Circuit NOTES: R2 x 1.32V LOSLVL = VCC -1.32V + R1 + R2 R1 + R2 2.6k
PRODUCT ORDERING CODE
Ordering Code SY88923VKC SY88923VKCTR Package Type K10-1 K10-1 Operating Range Commercial Commercial
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Micrel
SY88923V
PERFORMANCE CURVE
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 223-1
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
LOS Assert and Deassert Levels vs LOSLVL
100
INPUT LEVEL (mVp-p)
INPUT LEVEL (mVp-p)
90 80 70 60 50 40 30 20 10 0 0
3.3V TA = 25C 2.5Gbps Pattern 27-1
90 80 70 60 50 40 30 20 10 0 0
5.0V TA = 25C 2.5Gbps Pattern 27-1
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL = VCC - V (V)
-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
SY88923V
10 LEAD MSOP (K10-1)
Rev. 00
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Micrel
SY88923V
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Micrel
SY88923V
MICREL-SYNERGY
TEL
3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
+ 1 (408) 914-7878
WEB
+ 1 (408) 980-9191
FAX
http://www.synergysemi.com 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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