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Micrel, Inc.
3.3V/5V 3.2Gbps CML LOW-POWER LIMITING POST AMPLIFIER WITH TTL SD
SY88883V
SY88883V
FEATURES
s Multi-rate up to 3.2Gbps operation s Wide gain-bandwidth product * 38dB differential gain * 2.2GHz 3dB bandwidth s Low noise 50 CML data outputs * 800mVPP output swing * 60ps edge rates * 5psRMS typ. random jitter * 15psPP typ. deterministic jitter s Chatter-free Signal Detect (SD) output * 4.6dB electrical hysteresis * OC-TTL output with internal 5k pull-up resistor s Programmable SD sensitivity using single external resistor s Internal 50 data input termination s Wide operating range * Single 3.3V 10% or 5V 10% power supply * -40C to +85C industrial temperature range s Available in a tiny 10-pin MSOP (3mm x 3mm) package
DESCRIPTION
The SY88883V low-power, 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 SY88883V quantizes these signals and outputs typically 800mVPP voltage-limited waveforms. The SY88883V operates from a single +3.3V 10% or +5V 10% power supply, over the industrial temperature range of -40C to +85C. With its wide bandwidth and highgain, signals with data rates up to 3.2Gbps and as small as 10mVpp can be amplified to drive devices with CML inputs or AC-coupled PECL inputs. The SY88883V generates a signal detect (SD) opencollector TTL output with internal 5k pull-up resistor. 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. Typically 4.6dB SD hysteresis is provided to prevent chattering. All support documentation can be found on Micrel's web site at www.micrel.com.
APPLICATIONS
s 1.25Gbps and 2.5Gbps Gigabit Ethernet s 1.062Gbps and 2.125Gbps Fibre Channel s 155Mbps, 622Mbps, 1.25Gbps and 2.5Gbps SONET/SDH s Gigabit interface converter (GBIC) s Small form factor (SFF) and small form factor pluggable (SFP) transceivers s Parallel 10G Ethernet s High-gain line driver and line receiver
FUNCTIONAL BLOCK DIAGRAM
DIN 50 /DIN
Limiting Amplifer
CML Buffer
DOUT /DOUT
VCC -1.3V VCC GND 2.8k 5k
Level Detect
VCC
TYPICAL PERFORMANCE
3.3V, 25C, 10mVPP Input @2.5Gbps 223-1 PRBS, RLOAD = 50 to VCC
SDLVL
OC-TTL Buffer
SD
Output Swing (75mV/div.)
TIME (100ps/div.)
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
Rev.: B
Amendment: /0
1
Issue Date: August 2005
Micrel, Inc.
SY88883V
PACKAGE/ORDERING INFORMATION
Ordering Information
GND 1 DIN 2 /DIN 3 GND 4 SDLVL 5 10 VCC 9 DOUT 8 /DOUT 7 VCC 6 SD
Part Number SY88883VKI SY88823VKITR(1) SY88823VKG SY88823VKGTR(1)
Note: 1. Tape and Reel.
Package Type K10-1 K10-1 K10-1 K10-1
Operating Range Industrial Industrial Industrial Industrial
Package Marking 883V 883V 883V with Pb-Free bar-line indicator 883V with Pb-Free bar-line indicator
Lead Finish Sn-Pb Sn-Pb Pb-Free NiPdAu Pb-Free NiPdAu
10-Pin MSOP (K10-1)
PIN DESCRIPTION
Pin Number 1, 4 2, 3 5 Pin Name GND DIN, /DIN SDLVL Type Ground Differential Data Input Input: Default is maximum sensitivity. Open Collector TTL Output with internal 5k pull-up resistor Power Supply Pin Function Device ground. Differential data input. Each pin internally terminates to an internal reference voltage (VREF) through 50. Signal Detect Level Set: A resistor from this pin to VCC sets the threshold for the data input amplitude at which the SD output will be asserted. Bypass with 0.01F low ESR capacitor from SDLVL to VCC to stabilize SDLVL. Signal Detect: Asserts high when the data input amplitude rises above the threshold set by SDLVL.
6
SD
7, 10
VCC
Positive power supply. Bypass with 0.1F0.01F low ESR capacitors. 0.01F capacitors should be as close to VCC pins as possible. Differential data output.
8, 9
DOUT, /DOUT
Differential CML Output
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2
Micrel, Inc.
SY88883V
Absolute Maximum Ratings(1)
Supply Voltage (VCC) ....................................... 0V to +7.0V SDLVL Voltage ........................................................0 to VCC SD Current ................................................................. 5mA DOUT, /DOUT Current ................................................ 25mA DIN, /DIN Current ...................................................... 10mA Storage Temperature (TS) ....................... -65C to +150C Lead Temperature (soldering, 20 sec.) ..................... 260C
Operating Ratings(2)
Supply Voltage (VCC) .............................. +3.0V to +3.6V or ............................................................ +4.5V to +5.5V Ambient Temperature (TA) ......................... -40C to +85C Junction Temperature (TJ) ....................... -40C to +120C Package Thermal Resistance(3) MSOP (JA) Still-Air .................................................. 113C/W (JB) ................................................................ 74C/W
DC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50 to VCC; TA = -40C to +85C; typical values at VCC = 3.3V, TA = 25C. Symbol ICC ICC VREF SDLVL VOH VOL VOFFSET ZO ZI Parameter Power Supply Current(4) Power Supply Current(5) Internal Reference Voltage SDLVL Level Output HIGH Voltage Output LOW Voltage Differential Output Offset Single-Ended Output Impedance Single-Ended Input Impedance 40 40 50 50 Note 6 Note 6 VREF VCC-0.020 VCC-0.005 Condition 3.3V 5V 3.3V 5V Min Typ 19 21 32 38 VCC -1.3 VCC VCC 80 60 60 VCC-0.400 VCC-0.275 Max 28 31 53 58 Units mA mA mA mA V V V V mV
TTL DC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50 to VCC; TA = -40C to +85C; typical values at VCC = 3.3V, TA = 25C. Symbol 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 ratings conditions for extended periods may affect device reliability. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. Thermal performance assumes use of 4-layer PCB. Excludes current of CML output stage. See "Detailed Description." Total device current with no output load. Output levels are based on a 50 to VCC load impedance. If the load impedance is different, the output level will be changed. Amplifier is in limiting mode.
Parameter SD Output HIGH Level SD Output LOW Level
Condition Sourcing 100A Sinking 2mA
Min 2.4
Typ
Max VCC 0.5
Units V V
2. 3. 4. 5. 6.
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Micrel, Inc.
SY88883V
AC ELECTRICAL CHARACTERISTICS
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50 to VCC; TA = -40C to +85C; typical values at VCC = 3.3V, TA = 25C. Symbol HYS PSRR tOFF tON tr, tf tJITTER VID VOD VSR B-3dB AV(Diff) S21
Notes: 7. 8. 9. Electrical signal. With input signal VID > 50mVpp and 50 load. Deterministic jitter measured using K28.5 pattern at 2.488Gbps, VID = 10mVpp. Random jitter measured using K28.7 pattern at 2.488Gbps, VID = 10mVPP.
Parameter SD Hysteresis Power Supply Rejection Ratio SD Release Time SD Assert Time Differential Output Rise/Fall Time (20% to 80%) Deterministic Random Differential Input Voltage Swing Differential Output Voltage Swing SD Sensitivity Range 3dB Bandwidth Differential Voltage Gain Single-Ended Small-Signal Gain
Condition Note 7
Min 2
Typ 4.6 35 0.1 0.2
Max 8
Units dB dB s s ps psPP psRMS
0.5 0.5 120
Note 8 Note 9 10 Note 10 Note 11 550 10
60 15 5
1800 800 50 2.2
mVPP mVPP mVPP GHz dB dB
32 26
38 32
10. Input is a 200MHz square wave, tr < 300ps, 50 load. VID 14mVpp. 11. This is the detectable range of input amplitudes that can de-assert SD. The input amplitude to assert SD is 2-8dB higher than the de-assert amplitude. See "Typical Operating Characteristics" for a graph showing how to choose a particular RSDLVL for a particular SD de-assert, and its associated assert, amplitude.
TYPICAL OPERATING CHARACTERISTICS
VCC = 3.3V, GND = 0V, TA = 25C, unless otherwise stated.
90 80 70 VID (mVpp) 60 50 40 30 20 10
SD Assert/De-assert Level vs. RSDLVL
ASSERT
DE-ASSERT
0 10
100
1000 10000 100000 RSDLVL
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
4
Micrel, Inc.
SY88883V
DETAILED DESCRIPTION
The SY88883V low-power limiting post amplifier operates from a single +3.3V or +5V power supply, over temperatures from -40C to +85C. Signals with data rates up to 3.2Gbps and as small as 10mVPP can be amplified. Figure 1 shows the allowed input voltage swing. The SY88883V generates an SD output. SDLVL sets the sensitivity of the input amplitude detection. Input Amplifier/Buffer The SY88883V's inputs are internally terminated with 50 to an internal reference voltage (VREF). VREF is typically 1.3V below VCC. Unless not affected by this internal termination scheme, upstream devices need to be AC-coupled to the SY88883V's inputs. Figure 2 shows a simplified schematic of the input stage. The high-sensitivity of the input amplifier allows signals as small as 10mVPP to be detected and amplified. The input amplifier allows input signals as large as 1800mVPP. Input signals are linearly amplified with a typically 38dB differential voltage gain. Since it is a limiting amplifier, the SY88883V outputs typically 800mV PP voltage-limited waveforms for input signals that are greater than 10mVPP. Applications requiring the SY88883V to operate with highgain should have the upstream TIA placed as close as possible to the SY88883V's input pins to ensure the best performance of the device. Output Buffer The SY88883V's CML output buffer is designed to drive 50 lines. The output buffer requires appropriate termination for proper operation. An external 50 resistor to VCC or equivalent for each output pin provides this. Figure 3 shows a simplified schematic of the output stage and includes an appropriate termination method. Of course, driving a downstream device with a CML input that is internally terminated with 50 to VCC eliminates the need for external termination. As noted in the previous section, the amplifier outputs typically 800mVPP waveforms across 25 total loads. The output buffer, thus, switches typically 16mA tailcurrent. Figure 4 shows the power supply current measurement which excludes the 16mA tail-current. Signal Detect The SY88883V generates a chatter-free signal detect (SD) open-collector TTL output with internal 5k pull-up resistor as shown in Figure 5. SD is used to determine that the input amplitude large enough to be considered a valid input. SD asserts high if the input amplitude rises above the threshold set by SDLVL and deasserts low otherwise. Typically 4.6dB SD hysteresis is provided to prevent chattering. Signal Detect-Level Set A programmable signal detect-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 6. If desired, an appropriate external voltage may be applied rather than using a resistor. The smaller the external resistor, implying a smaller voltage difference from SDLVL to VCC, lowers the SD sensitivity. Hence, larger input amplitude is required to assert SD. "Typical Operating Characteristics" shows the relationship between the input amplitude detection sensitivity and the SDLVL setting resistor. Hysteresis The SY88883V provides typically 4.6dB 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 SY88883V provides typically 2.3dB SD optical hysteresis. As the SY88883V is an electrical device, this data sheet refers to hysteresis in electrical terms. With 4.6dB SD hysteresis, a voltage factor of 1.7 is required to assert SD from its deassert level.
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
DATA+
SY88883V
5mV (Min.) VIS(mV) 900mV (Max.)
DATA-
(DATA+) - (DATA-)
10mVpp (Min.) VID(mVpp) 1800mVpp (Max.)
Figure 1. VIS and VID Definition
VCC
VCC 50 50 50 0.1F DOUT Z0 = 50 /DOUT
VREF
VCC
50
50 0.1F DIN 0.1F /DIN AC-Coupling Capacitors
50
Z0 = 50
AC-Coupling Capacitors
16mA
ESD STRUCTURE
ESD STRUCTURE
GND
GND
Figure 2. Input Structure
VCC
Figure 3. Output Structure
VCC
ICC 16mA
5k SD
50
50
Figure 5. SD Output Structure
ESD STRUCTURE
VCC RSDLVL SDLVL
16mA
2.8k
GND
VREF
Figure 4. Power Supply Current Measurement
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
Figure 6. SDLVL Setting Circuit
6
Micrel, Inc.
SY88883V
TYPICAL APPLICATIONS CIRCUIT
SD
0.1F
DIN /DIN
VCC
From Transimpedance Amp.
0.1F
DOUT
0.1F
SY88883V
SDLVL
/DOUT
To CDR
0.1F
GND
VCC
200k 0.1F
M9999-081005 hbwhelp@micrel.com or (408) 955-1690
7
Micrel, Inc.
SY88883V
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. M9999-081005 hbwhelp@micrel.com or (408) 955-1690
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