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SY88933AL
3.3V, 1.25Gbps PECL High-Sensitivity Limiting Post Amplifier w/TTL Signal Detect
General Description
The SY88933AL high-sensitivity limiting post amplifier is designed for use in fiber-optic receivers. The device connects to typical transimpedance amplifiers (TIAs). The linear signal output from TIAs can contain significant amounts of noise and may vary in amplitude over time. The SY88933AL quantizes these signals and outputs PECL level waveforms. The SY88933AL operates from a single +3.3V power supply, over temperatures ranging from -40oC to +85oC. With its wide bandwidth and high gain, signal with data rates up to 1.25Gbps and as small as 5mVPP can be amplified to drive devices with PECL inputs. The SY88933AL generates a high gain signal-detect (SD) open-collector TTL output. The SD function has a high gain input stage for increased sensitivity. A programmable signal-detect level set pin (SDLVL) sets the sensitivity of the input amplitude detection. SD asserts high if the input amplitude rises above the threshold set by SDLVL and de-asserts low otherwise. The enable input (EN) de-asserts the true output signal without removing the input signal. The SD output can be fed back to the EN input to maintain output stability under a loss-of-signal condition. Typically, 3.4dB SD hysteresis is provided to prevent chattering. All support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* * * * * * * * * Single 3.3V power supply DC-to-1.25Gbps operation Low-noise PECL data outputs High gain SD Chatter-free open-collector TTL signal detect (SD) output with internal 4.75k pull-up resistor TTL EN input Programmable SD level set (SDLVL) Available in a tiny 10-pin MSOP package Pin-compatible with SY88933V
Applications
* * * * * * GPON/BPON/EPON/GEPON Gigabit Ethernet 531Mbps and 1062Mbps Fibre Channel OC-3 and OC-12 SONET/SDH High-gain line driver and line receiver Low-gain TIA interface
Markets
* FTTX * Optical transceiver * Datacom/telecom
MLF and MicroLeadFrame are registered trademarks of Amkor Technology. Micrel Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
February 2007
M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY88933AL
Typical Application Circuit
February 2007
2
M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SY88933AL
Ordering Information
Part Number SY88933ALKG SY88933ALKGTR(1) SY88933ALKI SY88933ALKITR
Note: 1. Tape and Reel.
(1)
Package Type K10-1 K10-1 K10-1 K10-1
Operating Range Industrial Industrial Industrial Industrial
Package Marking 933A with Pb-Free bar line indicator 933A with Pb-Free bar line indicator 933A 933A
Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free SnPb SnPb
Pin Configuration
10-Pin MSOP (K10-1)
Pin Description
Pin Number 1 Pin Name EN Type TTL Input: Default is HIGH. Data Input Data Input Pin Function Enable: This input enables the outputs when it is HIGH. Note that this input is internally connected to a 25k pull-up resistor and will default to a logic HIGH state if left open. True data input. Complementary data input. Reference voltage: Placing a capacitor here to VCC helps stabilize SDLVL. Input Ground Open-collector TTL output w/internal 4.75k pull-up resistor PECL Output PECL Output Power Supply Signal-Detect Level Set: a resistor from this pin to VCC sets the threshold for the data input amplitude at which SD will be asserted. Device ground. Signal-Detect: asserts high when the data input amplitude rises above the threshold set by SDLVL.
2 3 4 5 6 7
DIN /DIN VREF SDLVL GND SD
8 9 10
/DOUT DOUT VCC
Complementary data output. True data output. Positive power supply.
February 2007
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Micrel, Inc.
SY88933AL
Absolute Maximum Ratings(1)
Supply Voltage (VCC) .................................. 0V to +7.0V Input Voltage (DIN, /DIN) ..................................0 to VCC Output Current (IOUT) Continuous..................................................... 50mA Surge ........................................................... 100mA EN Voltage ........................................................0 to VCC VREF Current .................................... -800A to +500A SDLVL Voltage ...............................................VREF to VCC Lead Temperature (soldering, 20sec.) ................ 260C Storage Temperature (Ts) .................. -65C to +150C
Operating Ratings(2)
Supply Voltage (VCC)............................+3.0V to +3.6V Ambient Temperature (TA) ..................-40C to +85C Junction Temperature (TJ) ................-40C to +120C Junction Thermal Resistance MSOP (JA) Still-air ................................. 113C/W
DC Electrical Characteristics
VCC = +3.0V to +3.6V; RLOAD = 50 to VCC-2V; TA = -40C to +85C; typical values at VCC = +3.3V, TA = +25oC. Symbol ICC SDLVL VOH VOL VIHCMR VREF Parameter Power Supply Current SDLVL Voltage PECL Output HIGH Voltage PECL Output LOW Voltage Common Mode Range Reference Voltage Condition No output load VREF Min Typ 26 Max 39 VCC Units mA V V V V V
VCC-1.085 VCC-0.955 VCC-0.880 VCC-1.850 VCC-1.705 VCC-1.555 GND+2.0 VCC VCC-1.48 VCC-1.32 VCC-1.16
TTL DC Electrical Characteristics
VCC = 3.0V to 3.6V; RLOAD = 50 to VCC-2V; TA = -40C to +85C. Symbol VIH VIL IIH IIL VOH VOL
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 rating 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 EN Input HIGH Voltage EN Input LOW Voltage EN Input HIGH Current EN Input HIGH Current SD Output HIGH Level SD Output LOW Level
Condition
Min 2.0
Typ
Max 0.8
Units V V A A mA V V
VIN = 2.7V VIN = VCC VIN = 0.5V VCC > 3.3V, IOH-MAX < 160uA VCC < 3.3V, IOH-MAX < 160uA IOL = +2mA -0.3 2.4 2.0
20 100
0.5
V
February 2007
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M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc
SY88933AL
AC Electrical Characteristics
VCC = 3.0V to 3.6V; RLOAD = 50 Symbol PSRR tr, tf tJITTER VID VOD TOFF TON SDAL SDDL HYSL SDAM SDDM HYSM SDAH SDDH HYSH B-3dB AV(Diff) S21 Notes: 3. Amplifier in limiting mode. Input is a 200MHz square wave. 4. Deterministic jitter measured using 1.25Gbps K28.5 pattern, VID = 10mVpp. 5. Random jitter measured using 1.25Gbps K28.7 pattern, VID = 10mVpp. 6. See "Typical Operating Characteristics" for a graph showing how to choose a particular RSDLVL for a particular SD assert and its associated de-assert amplitude. 7. This specification defines electrical hysteresis as 20log (SD Assert/SD De-assert). The ratio between optical hysteresis and electrical hysteresis is found to vary between 1.5 and 2 depending upon the level of received optical power and ROSA characteristics. Based on that ratio, the optical hysteresis corresponding to the electrical hysteresis range 1dB-4.5 dB, shown in the AC characteristics table, will be 0.5dB-3dB optical hysteresis Parameter Power Supply Rejection Ratio Output Rise/Fall Time (20% to 80%) Deterministic Random Differential Input Voltage Swing Differential Output Voltage Swing SD Release Time SD Assert Time Low SD Assert Level Low SD De-assert Level Low SD Hysteresis Medium SD Assert Level Medium SD De-assert Level Medium SD Hysteresis High SD Assert Level High SD De-assert Level High SD Hysteresis 3dB Bandwidth Differential Voltage Gain Single-Ended Small-Signal Gain 30 RSDLVL = 15k, Note 6 RSDLVL = 15k, Note 6 RSDLVL = 15k, Note 7 RSDLVL = 5k, Note 6 RSDLVL = 5k, Note 6 RSDLVL = 5k, Note 7 RSDLVL = 100, Note 6 RSDLVL = 100, Note 6 RSDLVL = 100, Note 7 8 2 3 2 1.0 1 Note 3 Note 4 Note 5 Figure 1 VID > 18mVpp, Figure 1 5 1500 2 2 3.4 2.3 3.4 6.2 4.2 3.4 16.4 10.8 3.4 1 42 36 4.5 4.5 20 4.5 8 10 10 6.5 15 5 1800 to VCC-2V; TA = -40C to +85C; typical values at VCC = +3.3V, TA = +25oC. Condition Min Typ 35 260 Max Units dB ps pspp psRMS mVpp mVpp s s mVpp mVpp dB mVpp mVpp dB mVpp mVpp dB GHz dB dB
February 2007
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M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc
SY88933AL
Typical Characteristics
February 2007
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M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc
SY88933AL
Functional Block Diagram
Detailed Description
The SY88933AL low-power limiting post amplifier operates from a single +3.3V power supply, over temperatures from -40oC to +85oC. Signals with data rates up to 1.25Gbps, and as small as 5mVpp, can be amplified. Figure 1 shows the allowed input voltage swing. The SY88933AL generates an SD output. SDLVL sets the sensitivity of the input amplifier section. Input Amplifier/Buffer Figure 2 shows a simplified schematic of the SY88933AL's input stage. The high-sensitivity of the input amplifier allows signals as small as 5mVpp to be detected and amplified. The input amplifier also allows input signals as large as 1800mVpp. Input signals are linearly amplified with a typical 42dB differential voltage gain. Since it is a limiting amplifier, the SY88933AL outputs typically 1500mVpp voltage-limited waveforms for input signals that are greater than 12mVpp. Applications requiring the SY88933AL to operate with high-gain should have the upstream TIA placed as close as possible to the SY88933AL's input pins to ensure the best performance of the device. Output Buffer The SY88933AL's PECL output buffer is designed to drive 50 lines. The output buffer requires appropriate termination for proper operation. An external 50 resistor to VCC-2V for each output pin provides this. Figure 3 shows a simplified schematic of the output stage.
Signal-Detect The SY88933AL generates a chatter-free SD opencollector TTL output with an internal 4.75k pull-up resistor as shown in Figure 4. SD is used to determine that the input amplitude is large enough to be considered a valid input. SD asserts high if the input amplitude rises above the threshold set by SDLVL and de-asserts low otherwise. SD can be fed back to the enable (EN) input to maintain output stability under a loss of signal condition. EN de-asserts the true output signal without removing the input signals. Typically, 3.4dB SD hysteresis is provided to prevent chattering. Signal-Detect Level Set A programmable SD level set pin (SDLVL) sets the threshold of the input amplitude detection. Connecting an external resistor between VCC and SDLVL sets the voltage at SDLVL. This voltage ranges from VCC to VREF. The external resistor creates a voltage divider between VCC and VREF, as shown in Figure 5. Hysteresis The SY88933AL provides typically 3.4dB SD electrical hysteresis. By definition, a power ratio measured in dB is 10log (power ratio). Power is calculated as V2IN/R for an electrical signal. Hence, the same ratio can be stated as 20log (voltage ratio). While in linear mode, the electrical voltage input changes linearly with the optical power and hence, the ratios change linearly. Therefore, the optical hysteresis in dB is half the electrical hysteresis in dB given in the data sheet. The SY88933AL is an electrical device, and this data sheet refers to hysteresis in electrical terms. With 3.4dB SD hysteresis, a voltage factor of 1.5 is required to assert or de-assert SD.
February 2007
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M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc
SY88933AL
Figure 1. VIS and VID Definitions
Figure 2. Input Structure
Figure 3. Output Structure
Figure 4. SD Output Structure
Figure 5. SDLVL Setting Circuit Note: Recommended value for RSDLVL is 15k or less.
Related Product and Support Documentation
Part Number Application Notes Function Notes on Sensitivity and Hysteresis in Micrel Post Amplifiers Data Sheet Link http://www.micrel.com/product-info/app_hints+notes.shtml
February 2007
8
M9999-021207-B hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc
SY88933AL
Package Information
10-Pin MSOP (K10-1)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +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 a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated.
February 2007
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M9999-021207-B hbwhelp@micrel.com or (408) 955-1690

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