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Micrel, Inc.
5V/3.3V 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER
SY88903V
SY88903V
FEATURES
s s s s s s s s s 3.3V and 5V power supply option Up to 1.25Gbps 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 laser diode driver and controller s Available in a tiny 10-pin (3mm x 3mm) MSOP
DESCRIPTION
The SY88903V 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 1.25Gbps. Signals as small as 5mVpp can be amplified to drive devices with PECL inputs. The SY88903V generates a chatter-free, Loss-of-Signal (LOS), open-collector TTL output. The SY88903V 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 SY88903V 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. The SY88903V incorporates a programmable 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 condition. The sensitivity of the level detection can be adjusted using LOSLVL. The LOSLVL voltage can be set by connecting a resistor divider between VCC and VREF as shown in Figure 3. "Typical Characteristics" 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 SY88903V LOS 2k
APPLICATIONS
s s s s 1.25Gbps Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel 622Mbps SONET Gigabit Interface Converter
BLOCK DIAGRAM
DIN
Limiting Amplifer ECL Buffer
DOUT
Figure 1. LOS Output with Desired Rise Time
DOUT
DIN VREF
Enable
All support documentation can be found on Micrel's web site at www.micrel.com.
VCC GND
Level Detect
EN
LOSLVL
LOS
M9999-041505 hbwhelp@micrel.com or (408) 955-1690
Rev.: B
Amendment: /0
1
Issue Date: April 2005
Micrel, Inc.
SY88903V
PACKAGE/ORDERING INFORMATION
Ordering Information(1)
/EN 1 DIN 2 /DIN 3 VREF 4 LOSLVL 5 10 VCC 9 DOUT 8 /DOUT 7 LOS 6 GND
Part Number SY88903VKC SY88903VKCTR(2) SY88903VKG SY88903VKGTR(2)
Notes:
Package Type K10-1 K10-1 K10-1 K10-1
Operating Range Commercial Commercial Industrial Industrial
Package Marking 903V with Pb-free bar-line indicator 903V with Pb-free bar-line indicator 903V with Pb-free bar-line indicator 903V with Pb-free bar-line indicator
Lead Finish Sn-Pb Sn-Pb NiPdAu NiPdAu
10-Pin MSOP (K10-1)
1. Contact factory for die availability. Die is guaranteed at TA = 25C, DC electricals only. 2. Tape and Reel.
PIN DESCRIPTION
Pin Number 1 2 3 4 5 6 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 Loss-of-Signal Indicator (Active Low). Inverting Data Output. Data Output. Positive Power Supply.
M9999-041505 hbwhelp@micrel.com or (408) 955-1690
2
Micrel, Inc.
SY88903V
Absolute Maximum Ratings(1)
Supply Voltage (VCC) ....................................... 0V to +7.0V Input Voltage (DIN, /DIN, /EN, LOSLVL) ............... 0V to VCC Output Voltage (DOUT, /DOUT) with 50 Load ... VCC -2.5V to VCC +0.3V (VREF) ............................................ VCC -2.0V to VCC Lead Temperature (soldering, 10 sec.) ..................... 270C Storage Temperature (TS) ....................... -55C to +125C
Operating Ratings(2)
Supply Voltage (VIN) ...................................... +xxV to +xxV Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance MSOP (JA) ......................................................... xxC/W
DC ELECTRICAL CHARACTERISTICS
VCC = +5V 10% or +3.3V 10%; RLOAD = 50 to VCC -2V; TA = -40C to +85C; unless noted. Symbol ICC IIL IIH VCMR Voffset LOSLVL VOL IOH VOH VOL VREF IREF VIH VIL
Notes: 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 Ratings" 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.
Parameter Power Supply Current /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 HIGH Output DOUT and /DOUT LOW Output Reference Supply VREF Output Current /EN Input HIGH Voltage /EN Input LOW Voltage
Condition No output load VIN = 0.5V VIN = 2.7V VIN = VCC
Min
Typ 30
Max 42
Units mA mA A V mV V V A mV mV V mA V
-0.3 20 100 GND +2.0 VCC 100 VREF VCC 0.5 250 VCC -1085 VCC -955 VCC -880
IOL = +2mA VOH = 5.5V
VCC -1830 VCC -1705 VCC -1620 VCC -1.38 VCC -1.32 VCC -1.26 -0.8 2.0 0.8 0.5
V
M9999-041505 hbwhelp@micrel.com or (408) 955-1690
3
Micrel, Inc.
SY88903V
AC ELECTRICAL CHARACTERISTICS
VCC = +5V 10% or +3.3V 10%; RLOAD = 50 to VCC -2V; TA = -40C to +85C; unless noted. Symbol PSRR VID tr, tf VOD tOFFL tOFFH tONL VSR HYS Parameter Power Supply(3) Rejection Ratio Input Voltage Range Output Rise/Fall Time Differential Output Voltage Swing(4) LOS Release Time(5) Minimum Input LOS Release Time(6) Maximum Input LOS Assert Time(5) LOS Sensitivity Range LOS Hysteresis 223-1 pattern 223-1 pattern 5 2 4.6 VID > 100mVpp VID < 100mVpp VID = 15mVpp VID = 5mVpp Condition Input referred, 55MHz 5 trin,tfin 600 200 0.1 0.1 0.2 0.5 0.5 0.5 50 8 mV mV s s s mVpp dB Min Typ 35 1800 260 Max Units dB mVpp ps
Notes: 3. Input referred noise = RMS output noise/low frequency gain. 4. Input is a 622MHz square wave. 5. Input is a 200MHz square wave, tr < 300ps, 8mVpp. 6. Input is a 200MHz square wave, tr < 300ps, 1.8Vpp.
TYPICAL CHARACTERISTICS
100 90
LOS Assert and De-assert Levels vs LOSLVL
INPUT LEVEL (mVpp)
3.3V TA = 25C 1.25Gbps Pattern 27-1
100 90 80 70 60 50 40 30 20 10 0 0
LOS Assert and De-assert Levels vs LOSLVL
5.0V TA = 25C 1.25Gbps Pattern 27-1
INPUT LEVEL (mVpp)
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
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 LOSLVL VCC - V
M9999-041505 hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY88903V
DESIGN PROCEDURE
Output Termination The SY88903V outputs must be terminated with a 50 load to VCC -2V (or Thevenin equivalent). Layout and PCB Design Since the SY88903V 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 SY88903V 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 50
DIN+ DIN- 50 VREF
R2 VREF
Notes: R2 x 1.32V LOSLVS = VCC -1.32V + R1 + R2 R1 + R2 2.6k
0.1F
Figure 2. Differential Input Configuration
Figure 3. LOSLVL Circut
M9999-041505 hbwhelp@micrel.com or (408) 955-1690
5
Micrel, Inc.
SY88903V
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 data sheet 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. M9999-041505 hbwhelp@micrel.com or (408) 955-1690
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