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SY88403BL
3.3V 4.25Gbps CML Low-Power Limiting Post Amplifier with TTL LOS
General Description
The SY88403BL is a low-power limiting post amplifier optimized for copper applications. 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 SY88403BL quantizes these signals and outputs typically 800mVPP voltage-limited waveforms. The SY88403BL operates from a single +3.3V 10% power supply, over an industrial temperature range of -40C to +85C. With its wide bandwidth and high gain, signals with data rates up to 4.25Gbps and as small as 20mVPP can be amplified to drive devices with CML inputs or AC-coupled PECL inputs. The SY88403BL incorporates a loss-of-signal (LOS) open-collector TTL output with internal 4.75k pull-up resistor. A programmable loss-of-signal level set pin (LOSLVL) sets the sensitivity of the input amplitude detection. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. LOS can be fed back to the enable bar (/EN) input to maintain output stability under a loss of signal condition. /EN de-asserts the true output signal without removing the input signal. Typically 3.5dB LOS hysteresis is provided to prevent chattering. All support documentation can be found on Micrel's web site at: www.micrel.com.
Features
* Multi-rate up to 4.25Gbps operation * 20mVPP input sensitivity * Low noise 50 CML data outputs - 800mVpp output swing - 60ps edge rates - 1psRMS typ. random jitter - 10psPP typ. deterministic jitter * Chatter-free Loss-of-Signal (LOS) output - 3.5dB electrical hysteresis - OC-TTL output with internal 4.75k pull-up resistor * Programmable LOS sensitivity using single external resistor * Internal 50 data input termination * TTL /EN input allows feedback from LOS * Wide operating range: - Single 3.3V 10% power supply - Industrial temperature range: -40C to +85C * Available in a 10-pin EPAD-MSOP and 16-pin MLF(R) package
Applications
* 1.062Gbps, 2.125Gbps and 4.25Gbps Fibre Channel * Cable driver * Small form factor (SFF) and small form factor pluggable (SFP) transceivers * High-gain line driver and line receiver
Typical Performance
Markets
* Copper interconnect * Datacom and telecom * Storage area network (SAN)
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
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SY88403BL
Typical Application
Functional Block Diagram
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SY88403BL
Ordering Information(1)
Part Number SY88403BLEY SY88403BLEYTR(2) SY88403BLMG SY88403BLMGTR(2)
Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel.
Package Type K10-2 K10-2 MLF-16 MLF-16
Operating Range Industrial Industrial Industrial Industrial
Package Marking 403B with Pb-Free bar-line indicator 403B with Pb-Free bar-line indicator 403B with Pb-Free bar-line indicator 403B with Pb-Free bar-line indicator
Lead Finish Matte-Sn Matte-Sn NiPdAu Pb-Free NiPdAu Pb-Free
Pin Configuration
10-Pin EPAD-MSOP (K10-2)
16-Pin MLF(R) (MLF-16)
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SY88403BL
Pin Description
MLFTM Pin Number 1, 4 2, 3, 10, 11 Exposed Pad 5, 8, 13, 16 EPAD-MSOP Pin Number 2, 3 6 Exposed Pad 10 Pin Name DIN, /DIN GND VCC Type Differential data input Ground Power supply Pin Function Differential data input. Each pin internally terminates to REF through 50. Device ground. Exposed pad must be soldered (or equivalent) to the same potential as the ground pins. Positive power supply. Bypass with 0.1F||0.01F low ESR capacitors. 0.01F capacitors should be as close as possible to VCC pin. Reference Voltage. Bypass with 0.01F low ESR capacitor from VREF to VCC to stabilize LOSLVL and VREF. Open Collector TTL output with internal 4.75k pullup resistor Differential CML output Input: Default is maximum sensitivity. TTL input: Default is high. Loss-of-Signal: Asserts high when the data input amplitude falls below the threshold set by LOSLVL.
6 7
4 7
VREF LOS
9, 12 14
9, 8 5
DOUT, /DOUT LOSLVL
Differential data output. Loss-of-Signal level set: A resistor from this pin to VCC sets the threshold for the data input amplitude at which the LOS output will be asserted. Enable bar: De-asserts true data output when high. Incorporates 25k pull-up to VCC.
15
1
/EN
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SY88403BL
Absolute Maximum Ratings(1)
Supply Voltage (VCC) ............................... 0V to +7.0V /EN, LOSLVL Voltage.................................... 0 to VCC REF Current ......................................................1mA LOS Current ......................................................5mA DOUT, /DOUT Current ....................................25mA DIN, /DIN Current ............................................10mA 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 (TA).............. -40C to +120C Package Thermal Resistance(3) MLF(R) JA (Still-Air) .......................................... 61C/W JB ........................................................ 38C/W EPAD-MSOP JA (Still-Air) .......................................... 38C/W JB ........................................................ 22C/W
DC Electrical Characteristics
VCC = +3.0V to +3.6V; TA = -40C to +85C; typical values at VCC = +3.3V, TA = 25C.
Symbol ICC VREF VLOSLVL VOH VOL VOFFSET ZO ZI Parameter Power Supply Current REF Voltage LOSLVL Voltage Range DOUT, /DOUT HIGH Voltage DOUT, /DOUT LOW Voltage Differential Output Offset Single-Ended Output Impedance Single-Ended Input Impedance 40 40 50 50 Note 6 3.3V, Note 6 VREF VCC -0.020 VCC -0.475 VCC -0.005 VCC -0.400 Condition 3.3V, Note 4 3.3V, Note 5 Min Typ 25 41 VCC -1.3 VCC VCC VCC -0.350 80 60 60 Max 42 62 Units mA mA V V V V mV
TTL DC Electrical Characteristics
VCC = +3.0V to +3.6V; TA = -40C to +85C.
Symbol VOH VOL VIH VIL IIH IIL
Notes: 1. Permanent device damage may occur if ratings in the absolute maximum ratings section are exceeded. This is a stress rating only and functional operation is not implied for 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. 3. Thermal performance assumes are of 4-layer PCB. Exposed pad must be soldered (or equivalent) to the device's most negative potential on the PCB. 4. Excludes current of CML output stage. See "Detailed Description." 5. Total device current with no output load. 6. 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 LOS Output HIGH Level LOS Output LOW Level /EN Input HIGH Voltage /EN Input LOW Voltage /EN Input HIGH Current /EN Input LOW Current
Condition Sourcing 100A Sinking 2mA
Min 2.4 2.0
Typ
Max VCC 0.5 0.8
Units V V V V A A mA
VIN = 2.7V VIN = VCC VIN = 0.5V -0.3
20 100
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SY88403BL
AC Electrical Characteristics
VCC = +3.0V to +3.6V; TA = -40C to +85C; RL = 50 to VCC; typical values at VCC = +3.3V, TA = 25C.
Symbol tr, tf tJITTER VID VOD tOFF tON LOSAL LOSDL HSYL LOSAM LOSDM HSYM LOSAH LOSDH HSYH VSR AV(Diff) S21
Notes: 7. Amplifier in limiting mode. Input is a 200MHz square wave. 8. Deterministic jitter measured using 4.25Gbps K28.5 pattern, VID = 20mVPP. 9. Random jitter measured using 4.25Gbps K28.7 pattern, VID = 20mVPP. 10. See "Typical Operating Characteristics" for a graph showing how to choose a particular RLOSLVL for a particular LOS assert and its associated de-assert amplitude. 11. This specification defines electrical hysteresis as 20log(LOS De-assert/LOS Assert). The ratio between optical hysteresis and electrical hysteresis is found to vary between 1.5 and 2 depending on 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 0.5dB3dB Optical Hysteresis.
Parameter Output Rise/Fall Time (20% to 80%) Deterministic Random Differential Input Voltage Swing Differential Output Voltage Swing LOS Release Time LOS Assert Time Low LOS Assert Level Low LOS De-assert Level Low LOS Hysteresis Medium LOS Assert Level Medium LOS De-assert Level Medium LOS Hysteresis High LOS Assert Level High LOS De-assert Level High LOS Hysteresis LOS Sensitivity Range Differential Voltage Gain Single-Ended Small-Signal Gain
Condition Note 7 Note 8 Note 9 See Figure 1 See Figure 1
Min
Typ 60 10 1
Max 120
Units ps psPP psRMS
20 700 800 2 2
1800 950 10 10
mVpp mVpp s s mVPP mVPP
RLOSLVL = 15k, Note 10 RLOSLVL = 15k, Note 10 RLOSLVL = 15k, Note 11 RLOSLVL = 5k, Note 10 RLOSLVL = 5k, Note 10 RLOSLVL = 5k, Note 11 RLOSLVL = 100, Note 10 RLOSLVL = 100, Note 10 RLOSLVL = 100, Note 11 2 20 32 26 2 34 2 12
8 12 3.5 17 25 3.5 47 70 3.5 38 32 83 4.5 35 33 4.5 4.5
dB mVPP mVPP dB mVPP mVPP dB mVPP dB dB
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SY88403BL
Typical Operating Characteristics
60 55 CURRENT (mA) 50 45 40 35 30 25 -40
Power Supply Current vs. Temperature
RLOSLVL (k)
RLOSLVL (k)
-15 10 35 60 TEMPERATURE (C)
85
VOD (mVpp)
820 800 780 760 740 720 700 -40 -15 10 35 60 TEMPERATURE (C) 85
VOD (mVpp)
900 880 860 840
Differential Output Voltage Swing vs. Temperature (Amplifier in Limiting Mode)
Differential Output Voltage Swing vs. Differential Input Voltage Swing 900 800 700 600 500 400 300 200 100 0 0 5 10 15 20 25 30 35 40 45 50 VID (mVpp)
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SY88403BL Loss-of-Signal The SY88403BL incorporates a chatter-free loss-ofsignal (LOS) open-collector TTL output with internal 4.75k pull-up resistor as shown in Figure 5. LOS is used to determine that the input amplitude is too small to be considered a valid input. LOS asserts high if the input amplitude falls below the threshold set by LOSLVL and de-asserts low otherwise. LOS can be fed back to the enable (/EN) input to maintain output stability under a loss of signal condition. /EN deasserts low the true output signal without removing the input signals. Typically 3.5dB LOS hysteresis is provided to prevent chattering. Loss-of-Signal Level Set A programmable loss-of-signal level set pin (LOSLVL) sets the threshold of the input amplitude detection. Connecting an external resistor between VCC and LOSLVL sets the voltage at LOSLVL. 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 relationship between VLOSLVL and RLOSLVL is given by:
RLOSLVL VLOSLVL = VCC - 1.3 RLOSLVL + 2.8
Detailed Description
The SY88403BL low-power limiting post amplifier operates from a single +3.3V power supply, over temperatures from -40C to +85C. Signals with data rates up to 4.25Gbps and as small as 20mVPP can be amplified. Figure 1 shows the allowed input voltage swing. The SY88403BL generates an LOS output, allowing feedback to /EN for output stability. LOSLVL sets the sensitivity of the input amplitude detection. Input Amplifier/Buffer The SY88403BL's inputs are internally terminated with 50 to REF. If not affected by this internal termination scheme, upstream devices need to be AC-coupled to the SY88403BL's inputs. Figure 2 shows a simplified schematic of the input stage. The high-sensitivity of the input amplifier allows signals as small as 20mVPP 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 SY88403BL outputs typically 800mVPP voltage-limited waveforms for input signals that are greater than 20mVPP. Applications requiring the SY88403BL to operate with high-gain should have the upstream TIA placed as close as possible to the SY88403BL's input pins to ensure the best performance of the device. Output Buffer The SY88403BL'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 tail-current. Figure 4 shows the power supply current measurement, which excludes the 16mA tail-current.
where voltages are in volts and resistances are in k. The smaller the external resistor, implying a smaller voltage difference from LOSLVL to VCC, lowers the LOS sensitivity. Hence, larger input amplitude is required to de-assert LOS. "Typical Operating Characteristics" contains graphs showing the relationship between the input amplitude detection sensitivity and RLOSLVL. Hysteresis The SY88403BL provides typically 3.5dB LOS electrical hysteresis. By definition, a power ratio measured in dB is 10log (power ratio). Power is calculated as VIN2/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 SY88403BL provides typically 1.75dB LOS optical hysteresis. As the SY88403BL is an electrical device, this datasheet refers to hysteresis in electrical terms. With 3.5dB LOS hysteresis, a voltage factor of 1.5 is required to de-assert LOS.
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SY88403BL
Figure 1. VIS and VID Definition
Figure 2. Input Structure
Figure 3. Output Structure
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Micrel, Inc.
SY88403BL
Figure 5. LOS Output Structure
Figure 4. Power Supply Current Measurement
Figure 6. LOSLVL Setting Circuit
Related Product and Support Documentation
Part Number Application Notes Function Notes on Sensitivity and Hysteresis in Micrel Post Amplifier Data Sheet Link www.micrel.com/product-info/app_hints+notes.shtml
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SY88403BL
Package Information
16-Pin MicroLeadFrame(R) (MLF-16)
PCB Thermal Consideration for 16-Pin MLF(R) Package (Always solder, or equivalent, the exposed pad to the PCB)
Package Notes: 1. Package meets Level 2 qualification. 2. All parts are dry-packaged before shipment. 3. Exposed pads must be soldered to a ground for proper thermal management.
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Micrel, Inc.
SY88403BL
10-Pin EPAD-MSOP (K10-2)
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.
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