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Micrel, Inc.
5V/3.3V 3.2Gbps HIGH-SPEED LIMITING POST AMPLIFIER
SY88923AV
SY88923AV
FEATURES
s s s s s s s Single 3.3V or 5V power supply Up to 3.2Gbps operation Low noise PECL data outputs Chatter-free open collector TTL LOS output TTL /EN Input Differential PECL inputs for data Available in a tiny 10-pin (3mm) MSOP and 10-pin (3mm) EPAD-MSOP
DESCRIPTION
The SY88923AV 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 3.2Gbps. Signals as small as 5mVPP can be amplified to drive devices with PECL inputs. The SY88923AV generates a chatter-free Loss-of-Signal (LOS) open collector TTL output. The SY88923AV 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 shown in Figure 3. "Typical Operating Characteristics" on page 6 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 SY88923AV LOS 4.7k to 10k
APPLICATIONS
s 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 Parallel 10G Ethernet
Figure 1. LOS Output with Desired Rise Time
BLOCK DIAGRAM
DIN
Limiting Amplifer ECL Buffer
DOUT /DOUT /EN
/DIN VREF
Enable
VCC GND
Level Detect
LOSLVL
LOS
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
Rev.: F
Amendment: /0
1
Issue Date: November 2005
Micrel, Inc.
SY88923AV
PACKAGE/ORDERING INFORMATION
/EN 1 DIN 2 /DIN 3 VREF 4 LOSLVL 5 10 VCC 9 DOUT 8 /DOUT 7 LOST 6 GND
Ordering Information(1)
Part Number SY88923AVKC SY88923AVKCTR(2) SY88923AVEC SY88923AVECTR(2) SY88923AVKG(3) SY88923AVKGTR(2, 3) SY88923AVEY(3) SY88923AVEYTR(2, 3) Package Type K10-1 K10-1 K10-2 K10-2 K10-1 K10-1 K10-2 K10-2 Operating Range Commercial Commercial Commercial Commercial Industrial Industrial Industrial Industrial Package Marking 923AV 923AV 923AV 923AV 923AV with Pb-free bar-line indicator 923AV with Pb-free bar-line indicator Lead Finish Sn-Pb Sn-Pb Sn-Pb Sn-Pb NiPdAu Pb-Free NiPdAu Pb-Free
10-Pin MSOP (K10-1) 10-Pin EPAD-MSOP (K10-2)
923AV with Matte-Sn Pb-free bar-line indicator Pb-Free 923AV with Matte-Sn Pb-free bar-line indicator Pb-Free
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. 3. Pb-Free package is recommended for new designs.
PIN DESCRIPTION
Pin Number MSOP 1 2 3 4 5 6 7 8 9 10 Pin Number EPAD-MSOP 1 2 3 4 5 6, (Exposed Pad) 7 8 9 10 Pin Name /EN DIN /DIN VREF LOSLVL GND LOS /DOUT DOUT VCC Type TTL Input Data Input Data Input Output Input Ground TTL Output (Open Collector) PECL Output PECL Output Power Supply Pin Function Output Enable (Active Low). Data Input. Inverting Data Input. Reference Voltage Output for LOS Level Set (see Figure 3). LOS Limit Set. Ground. Exposed pad must be connected to PCB ground plane. Loss of Signal Indicator (Active High). Inverting Data Output. Data Output. Positive Power Supply.
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY88923AV
Absolute Maximum Ratings(1)
Power Supply Voltage (VCC) ............................ 0V to +7.0V Input Voltage (DIN, /DIN) ........................................................ 0V to VCC (/EN) ................................................................ 0V to VCC (LOSLVL) .......................................................... 0V to VCC Output Voltage (with 50 load) (DOUT, /DOUT) .......................... VCC -2.5V to VCC +0.3V (VREF) .................................................. VCC -2.0V to VCC Lead Temperature (soldering, 20 sec.) ..................... 260C Storage Temperature (TS) ....................... -55C to +125C
Operating Ratings(2)
Supply Voltage (VCC) .................................. +3.0V to +5.5V Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance MSOP (JA) Still-Air ........................................................... 113C/W EPAD-MSOP (JA) Still-Air ............................................................. 38C/W
DC ELECTRICAL CHARACTERISTICS(3)
VCC =+5V 10% or +3.3V 10%; RL = 50 to VCC -2V; TA = -40C to +85C; unless otherwise noted. Symbol ICC Parameter Power Supply Current Condition No output load VCC = 5V 10%, VCC = 3.3V 10% VIN = 0.5V VIN = 2.7V VIN = VCC GND +2.0 -0.3 20 100 VCC 80 VREF IOL = +2mA VOH = 5.5V VCC 0.5 100 VCC -1085 VCC -955 VCC -880 VCC -1830 VCC -1705 VCC -1555 VCC -1.38 VCC -1.32 VCC -1.26 -0.8 2.0 0.8 0.5 Min Typ 38 35 Max 60 53 Units mA mA mA A A V mV V V A mV mV V mA V V
IIL IIH VCMR Voffset LOSLVL VOL IOH VOH VOL VREF IREF VIH VIL
Notes:
/EN Input LOW Current /EN Input HIGH Current Common Mode Range Differential Output Offset LOSLVL Level LOS Output LOW Level LOS Output Leakage DOUT and /DOUT Output HIGH Voltage DOUT and /DOUT Output LOW Voltage Reference Supply VREF Output Current /EN Input HIGH Voltage /EN Input LOW Voltage
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. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. The device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is tested in a socket such that transverse airflow of 500lfpm is maintained.
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88923AV
AC ELECTRICAL CHARACTERISTICS
VCC =+5V 10% or +3.3V 10%; RL = 50 to VCC -2V; TA = -40C to +85C; unless otherwise noted. Symbol VID VOD Parameter Input Voltage Range Differential Output Voltage Swing Note 4 VID = 15mVPP VID = 5mVPP Note 5 Note 5 223-1 pattern 223-1 pattern VID > 100mVPP VID < 100mVPP 5 2 4.6 115 trin,tfin Condition Min 5 1400 600 0.2 0.1 0.5 0.5 50 8 150 Typ Max 1800 Units mVPP mVPP mVPP s s mVPP dB ps
tON tOFF VSR HYS tr, tf
Notes:
LOS Assert Time LOS Release Time LOS Sensitivity Range LOS Hysteresis Output Rise/Fall Time
4. Input is a 200MHz square wave, tr < 300ps. 5. Input is a 200MHz square wave, tr < 300ps, 1.8VPP.
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88923AV
GENERAL DESCRIPTION
General The SY88923AV 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 trans-impedance amplifier can contain significant amounts of noise, and may vary in amplitude over time. The SY88923AV 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.
DESIGN PROCEDURE
Output Termination The SY88923AV outputs must be terminated with a 50 load to VCC - 2V (or Thevenin equivalent). Layout and PCB Design Since the SY88923AV 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 SY88923AV 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
R1 LOSLVL
0.1F 0.1F
R2
DIN+
VREF
DIN-- 50 VREF 0.1F
Note 1.
50
Figure 3. LOSLVL Circuit
LOSLVL = VCC -1.32V + R1 + R2 2.6k R2 x 1.32V R1 + R2
VCC
Figure 2. Differential Input Configuration
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88923AV
TYPICAL OPERATING CHARACTERISTICS
100 90
INPUT LEVEL (mVpp)
LOS Assert and De-Assert Levels vs. LOSLVL
INPUT LEVEL (mVpp)
100 90 80 70 60 50 40 30 20 10 0
LOS Assert and De-Assert Levels vs. LOSLVL
5.0V TA = 25C 2.5Gbps Pattern 223-1 De-Assert
80 70 60 50 40 30 20 10 0 0 Assert
3.3V TA = 25C 2.5Gbps Pattern 223-1
De-Assert
Assert 0 -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)
100
INPUT LEVEL (mVpp)
LOS Assert and De-Assert Levels vs. LOSLVL
INPUT LEVEL (mVpp)
90 80 70 60 50 40 30 20 10 0 Assert 0
3.3V TA = 25C 2.5Gbps Pattern 27-1
100 90 80 70 60 50 40 30 20 10 0
LOS Assert and De-Assert Levels vs. LOSLVL
5.0V TA = 25C 2.5Gbps Pattern 27-1 De-Assert
De-Assert
Assert 0 -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)
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
6
Micrel, Inc.
SY88923AV
10-PIN MSOP (K10-1)
Rev. 00
M9999-110905 hbwhelp@micrel.com or (408) 955-1690
7
Micrel, Inc.
SY88923AV
10-PIN EPAD-MSOP (K10-2)
+0.08 -0.08 +0.003 -0.003 +0.05 -0.05 +0.002 -0.002
+0.15 -0.15 +0.004 -0.004
+0.10 -0.10 +0.004 -0.004
+0.008 -0.008 +0.003 -0.003
+0.07 -0.08 +0.003 -0.003
+0.15 -0.15 +0.006 -0.006
Rev.01
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. M9999-110905 hbwhelp@micrel.com or (408) 955-1690
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