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Micrel, Inc.
3.3V/5V 155Mbps PECL LOW POWER LIMITING POST AMPLIFIER WITH PECL SIGNAL DETECT
DESCRIPTION
SY88813V
SY88813V
FEATURES
s s s s s s s Single 3.3V or 5V power supply Up to 155Mbps operation Low noise PECL data outputs Chatter-free PECL Signal Detect (SD) output TTL /EN input Programmable SD level set (SDLVL) Available in a tiny 10-pin MSOP (3mm) package
APPLICATIONS
s 155Mbps SONET/SDH s Small form factor transceivers s High-gain line driver and line receiver
The SY88813V 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 SY88813V quantizes these signals and outputs PECL level waveforms. The SY88813V operates from a single +3.3V or +5V power supply, over temperatures ranging from -40C to +85C. With its wide bandwidth and high gain, signals with data rates up to 155Mbps and as small as 5mVPP can be amplified to drive devices with PECL inputs. The SY88813V generates a PECL signal-detect output. 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 deasserts low otherwise. /EN deasserts the true output signal without removing the input signal. Typically 4.6dB SD hysteresis is provided to prevent chattering.
TYPICAL APPLICATIONS CIRCUIT
Rpd
VCC
SD From Transimpedance Amp.
0.1F 0.1F
50 DIN /DIN 50
/EN
DOUT
0.1F 0.1F
Rpd
SY88813V
SDLVL VCC VREF
/DOUT Rpd
To CDR
GND
100 3k
GND
For 3.3V, Rpd = 120 For 5V, Rpd = 220
M9999-072505 hbwhelp@micrel.com or (408) 955-1690
Rev.: B
Amendment: /0
1
Issue Date: July 2005
Micrel, Inc.
SY88813V
PACKAGE/ORDERING INFORMATION
Ordering Information
/EN 1 DIN 2 /DIN 3 VREF 4 LOSLVL 5 10 VCC 9 DOUT 8 /DOUT 7 /LOS 6 GND
Part Number SY88813VKC SY88813VKCTR(1) SY88813VKG SY88813VKGTR(1)
Note: 1. Tape and Reel.
Package Type K10-1 K10-1 K10-1 K10-1
Operating Range Commercial Commercial Industrial Industrial
Package Marking 813V 813V 813V with Pb-Free bar-line indicator 813V 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 2 3 4 5 Pin Name /EN DIN /DIN VREF SDLVL Input Type TTL Input: Default is high. Data Input Data Input Pin Function Enable: Deasserts true data output when high. True data input. Complementary data input. Reference voltage. Signal-Detect Level Set: A voltage between VCC and VREF on this pin 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. Complementary data output. True data output. Positive power supply.
6 7 8 9 10
GND SD /DOUT DOUT VCC
Ground PECL Output PECL Output PECL Output Power Supply
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Micrel, Inc.
SY88813V
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 ........................................................0 to VCC Lead Temperature (soldering, 20 sec.) ................... +260C Storage Temperature (TS) ....................... -55C to +125C
Operating Ratings(2)
Supply Voltage (VCC) .............................. +3.0V to +3.6V or ............................................................ +4.5V to +5.5V Ambient Temperature (TA), Note 3 ............ -40C to +85C Junction Temperature (TJ), Note 3 .......... -40C to +120C Package Thermal Resistance MSOP (JA) Still-Air .................................................. 113C/W (JB) Still-Air .................................................... 74C/W
DC ELECTRICAL CHARACTERISTICS4)
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50 to VCC-2V; TA = -40C to +85C; typical values at VCC = 3.3V, TA = 25C Symbol ICC SDLVL VIH VIL IIH IIL VOH VOL VOFFSET VIHCMR VREF Parameter Power Supply Current SDLVL Voltage /EN Input HIGH Voltage /EN Input LOW Voltage /EN Input HIGH Current /EN Input LOW Current PECL Output HIGH Voltage PECL Output LOW Voltage Differential Output Offset Common Mode Range Reference Voltage Note 5 Note 6 GND +1.7 VCC-1.38 VCC-1.32 VIN = 2.7V VIN = VCC VIN = 0.5V 50 to VCC-2V output load 50 to VCC-2V output load -0.3 VCC-1.085 VCC-0.955 VCC-0.880 VCC-1.830 VCC-1.705 VCC-1.555 100 VCC VCC-1.26 Condition no output load VREF 2.0 0.8 20 100 Min Typ 21 Max 40 VCC Units mA V V V A A mA V V mV V V
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 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. Commercial devices are guaranteed from 0C to +85C ambient temperature. 4. Specification for packaged product only. 5. The VIHCMR range is referenced to the most positive side of the differential input signal. 6. The current provided into or from VREF must be limited to 800A source and 500A sink.
M9999-072505 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88813V
AC ELECTRICAL CHARACTERISTICS(7)
VCC = 3.0V to 3.6V or 4.5V to 5.5V; RLOAD = 50 to VCC-2V; TA = -40C to +85C; typical values at VCC = 3.3V, TA = 25C Symbol HYS tOFF tON tr,tf VID VOD VSR AV(Diff) B-3dB S21
Note : 7. Specification for packaged product only.
Parameter SD Hysteresis SD Release Time SD Assert Time Differential Output Rise/Fall Time (20% to 80%) Differential Input Voltage Swing Differential Output Voltage Swing SD Sensitivity Range Differential Voltage Gain 3dB Bandwidth Single-Ended Small-Signal Gain
Condition electrical signal
Min 2
Typ 4.6 0.1 0.2
Max 8 0.5 0.5 1000
Units dB s s ps mVPP mVPP mVPP
5 VID 18mVPP VID = 5mVPP 5 38 200 26 32 1500 400
1800
50
mVPP dB MHz dB
TYPICAL OPERATING CHARACTERISTICS
VID (mVp-p)
60 50 40 30 20 10 0 0
VID (mVp-p)
100 90 80 70
3.3V SD Assert and Deassert Levels vs. SDLVL
3.3V TA = 25C 155Mbps 23 Pattern 2 -1
100 90 80 70 60 50 40 30 20 10
5V SD Assert and Deassert Levels vs. SDLVL
5.0V TA = 25C 155Mbps 23 Pattern 2 -1
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 SDLVL (referenced to VCC) (V)
0
0
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 SDLVL (referenced to VCC) (V)
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Micrel, Inc.
SY88813V
DETAILED DESCRIPTION
The SY88813V 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 155Mbps and as small as 5mVPP can be amplified. Figure 1 shows the allowed input voltage swing. The SY88813V generates a SD output. SDLVL sets the sensitivity of the input amplitude detection. Input Amplifier/Buffer Figure 2 shows a simplified schematic of the SY88813V's input stage. The high-sensitivity of the input amplifier allows signals as small as 5mVPP 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 SY88813V outputs typically 1500mVPP voltage-limited waveforms for input signals that are greater than 18mVPP. Applications requiring the SY88813V to operate with highgain should have the upstream TIA placed as close as possible to the SY88813V's input pins to ensure the best performance of the device. Output Buffer The SY88813V'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 and includes an appropriate termination method. Signal-Detect The SY88813V generates a chatter-free PECL SD similar to the SY88813V's output buffer. 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 deasserts low otherwise. /EN deasserts the true output signal without removing the input signals. 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. Setting a voltage on SDLVL between VCC and VREF sets this threshold. If desired, a resistor divider between VCC and VREF, as shown in Figure 4, also creates this threshold. The smaller the voltage difference from SDLVL to VCC, the smaller 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 voltage. Hysteresis The SY88813V 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 datasheet. The SY88813V provides typically 2.3dB SD optical hysteresis. As the SY88813V is an electrical device, this datasheet refers to hysteresis in electrical terms. With 6dB SD hysteresis, a voltage factor of two is required to assert or deassert SD.
M9999-072505 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88813V
DATA+
2.5mV (Min.) VIS(mVp-p) 900mV (Max.)
DATA--
(DATA+) -- (DATA--)
5mVp-p (Min.) VID(mVp-p) 1800mVp-p (Max.)
Figure 1. VIS and VID Definition
VCC
VCC
ESD STRUCTURE
DOUT /DOUT
DIN
/DIN
ESD STRUCTURE
GND
GND
Figure 2. Input Structure
Figure 3. Output Structure
VCC R1 SDLVL R2 VREF
Figure 4. SDLVL Setting Circuit
Notes. SDLVL = VCC - 1.32V + x 1.32V R1 + R2
R2
R1 + R2 5k
M9999-072505 hbwhelp@micrel.com or (408) 955-1690
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Micrel, Inc.
SY88813V
FUNCTIONAL BLOCK DIAGRAM
DIN /DIN VREF VCC GND
Limiting Amplifer
PECL Buffer
DOUT /DOUT
Enable
/EN
Level Detect
SDLVL
SD
DESIGN PROCEDURE
Layout and PCB Design Since the SY88813V is a high-frequency component, performance can be largely determined by the board layout and design. A common problem with high-gain amplifiers is the feedback from the large swing outputs to the input via the power supply. The SY88813V's 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.
M9999-072505 hbwhelp@micrel.com or (408) 955-1690
7
Micrel, Inc.
SY88813V
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 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. M9999-072505 hbwhelp@micrel.com or (408) 955-1690
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