M02050G-15

M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Applications Features • • • • • • • • • • • • • • • 2.5 Gbps STM-16/OC-48 SDH/SONET 1.06, 2.12 and 4.24 Gbps Fibre Channel 1.25 Gbps Ethernet 2.67 Gbps SDH/SONET with FEC Operates with a 3.3 or 5V supply 4 mV typical input sensitivity at 2.5 Gbps PECL outputs Rate Selection for ≤ 1.25 Gbps operation Average Receive power monitor output (RSSIAVG) Peak-to-peak Receive power monitor output (RSSIPP) On-chip DC offset cancellation circuit Low power (< 180 mW at 3.3V) Programmable CML Output Amplitude Level Output Jam Function 16 pin 3x3 QFN package The M02050-15 is an integrated high-gain limiting amplifier. The M02050-15 features PECL outputs and is intended for use in applications to 2.5 Gbps. Full output swing is achieved even at minimum input sensitivity. The M02050-15 can operate with a 3.3V or 5V supply. Rate select is supported for SFP applications and/or to achieve optimum sensitivity at data rates ≤ 1.25 Gbps. When rate select is high, optimum sensitivity is achieved at 2.5 Gbps. The M02050-15 also includes two analog RSSI outputs proportional to either the average or peak to peak input signal and a programmable signal-level detector allowing the user to set thresholds at which the logic outputs are enabled. Other available solutions: M02049-15 3.3/5V Limiting Amplifier for Applications to 4.3 Gbps (CML outputs) M02040-15 3.3/5V Limiting Amplifier for Applications to 2.125 Gbps (PECL outputs) M02043-15 3.3/5V Limiting Amplifier for Applications to 4.3 Gbps (CML outputs) 1.25 Gbps and 4.25 Gbps SFP reference designs available on MACOM’s website. Typical Applications Diagram 12.1 k Ω RATE SEL Control +3.3 V Jam IREF RATE SEL V TT optional Biasing AC-Coupled to TIA DINP PECLP Limiting Amplifier M02013 TIA Photodiode Output Buffer DINN MON Clock Data Recovery Unit PECLN Offset cancel Level Detect RxAVGIN RSSIAVG R EXT Level Shift Threshold Setting Circuit ST SET RSSIPP Comparator RST Regulator V CC3 V AC or DC Coupled (as described in Applications Information) LOS CC 1 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Preliminary - Rev V5P M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P Ordering Information Part Number Package Operating Temperature M02050-15 * M02050-15 in QFN16 package –40 °C to 85 °C M02050-15EVM Evaluation board with M02050-15 –40 °C to 85 °C Revision History Revision Level Date Description V5P Preliminary May 2015 Updated logos and page layout. No content changes. D (V4P) Preliminary April 2005 Separated the M02049 and M02050 data sheets. New document number for the M02049 is 0204915-DSH-002-D. Update the following DC specifications: ICC, RINDIFF and VOH. Update the following ac specifications: VIN(MIN), vn, VLOS, HYS, DJ, RJ, tr/tf, TLOS_ON, and TLOS_OFF. Update RST and RSSI values for this revision of the part. 16 1 12 VCC Connect to GND DINN 9 RATESEL 150 mV/div 80 ps/div DINP 8 VCC3 5 IREF 4 10 mVPP differential input 2.5 Gbps RxAvgIN GND Center Pad PECLN PECLP 13 STSET GND JAM LOS RSSIAVG M02050-15 Pin Configuration RSSIPP M02050 Typical Eye Diagram 2 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change * The letter “G” designator after the part number indicates that the device is RoHS-compliant. M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P 1.0 Product Specification Absolute Maximum Ratings These are the absolute maximum ratings at or beyond which the IC can be expected to fail or be damaged. Reliable operation at these extremes for any length of time is not implied. NOTE: Table 1-1. The package bottom must be adequately grounded to ensure correct thermal and electrical performance, and it is recommended that vias are inserted through to a lower ground plane. Absolute Maximum Ratings Symbol Parameter Rating Units -0.5 to +5.75V V -65 to +150 °C VCC - 2 to VCC + 0.4 V 30 mA 0.80 V Data input pins voltage meeting |DINP - DINN| requirement GND to VCC3 + 0.4 V Signal detect threshold setting pin voltage GND to VCC + 0.4 V JAM Output enable pin voltage GND to VCC + 0.4 V LOS Status Output pins voltage GND to VCC + 0.4 V Rate_Sel Rate Select input pin voltage GND to VCC + 0.4 V IREF Current into Reference input +0 to -120 µA I(RSSIAVG) Current into RSSIavg input +0 to -3 mA VCC Power supply voltage (VCC-GND) TSTG Storage temperature PECLP, PECLN I(PECLP), I(PECLN) |DINP - DINN| DINP, DINN STSET PECL Output pins voltage PECL Output pins maximum continuous current (delivered to load) Data input pins differential voltage RSSIPP RSSIPP pin voltage GND to +3.6 V I(LOS) Current into Loss of Signal pin +1500 to -100 µA 3 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 1.1 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 1.2 Preliminary - Rev V5P Recommended Operating Conditions Recommended Operating Conditions Parameter Rating Units +5V ± 7.5% or +3.3V ± 7.5% V Junction temperature -40 to +110 °C Operating ambient -40 to +85 °C Power supply: (VCC-GND) (apply no potential to VCC3) or (VCC3-GND) (connect VCC to same potential as VCC3) 1.3 DC Characteristics VCC = +3.3V ± 7.5% or +5V ± 7.5%, TA = -40°C to +85°C, unless otherwise noted. Typical specifications are for VCC = 3.3V, TA = 25°C, unless otherwise noted. Table 1-3. Symbol ICC VOUTLpecl VOUTHpecl RINDIFF DC Characteristics Parameter Conditions Supply Current Min Includes PECL load PECL Output Low (PECLP, PECLN) Voltage Single ended; 50 Ω load to VCC-2V PECL Output High (PECLP, PECLN) Voltage Single ended; 50Ω load to VCC-2V – Typ Max Units (1) TBD mA 54 VCC-1.81 VCC-1.71 VCC-1.62 V VCC-1.025 VCC-0.952 VCC-0.88 V 90 115 135 Ω Differential Input Resistance Measured between DINP and DINN VOH LOS Output High Voltage External 4.7-10 kΩ pull up to VCC 2.75 VCC – V VOL LOS Output Low Voltage External 4.7-10 kΩ pull up to VCC 0 – 0.4 V VIH Logic Input High Voltage 2.7 – VCC V – – 0.8 V JAM, RATESEL VIL Logic Input Low Voltage JAM, RATESEL Notes: 1. RATESEL high (high bandwidth operation). Typical supply current decreases by 1.5 mA in low rate mode. 4 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Table 1-2. M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 1.4 Preliminary - Rev V5P AC Characteristics VCC = +3.3V ± 7.5% or +5V ± 7.5%, TA = -40°C to +85°C, input bit rate = 2.5 Gbps 223-1 PRBS high rate mode (RATESEL = High) unless otherwise noted. Typical specifications are for VCC = 3.3V, TA = 25°C, unless otherwise noted. Symbol VIN(MIN)) VI(MAX) AC Characteristics Parameter Differential Input Sensitivity Input Overload Conditions Min Typ Max Units 1.25 Gbps, BER < 10 , low rate mode (RATESEL = low) – 2 – mV 2.5 Gbps, BER < 10-12 – 4 7 mV -12 1200 – – mV -12 600 – – mV -12 BER < 10 , differential input 2.5 Gbps BER < 10 , single-ended input, 2.5 Gbps RMS Input Referred Noise RATESEL = high – 280 – μVRMS VLOS Loss of Signal Programmable Range Differential inputs 5 – 75 mV HYS Signal Detect Hysteresis electrical; across LOS programmable range 2 3.5 5.5 dB 4 – 100 mV vn RSSIpp Peak-to-peak received signal strength Differential input signal range indicator range RSSIavg Average received signal strength ± 15% accuracy indicator range ± 20% accuracy BWLF Small-Signal –3dB Low Frequency Excluding AC coupling capacitors Cutoff 5 – 500 μA 0.5 – 2 mA – 25 – kHz DJ Deterministic Jitter (includes DCD) K28.5 pattern at 2.5 Gbps, 10 mVPP input – – 25 ps RJ Random Jitter 10 mVPP input – 4.7 – psRMS tr / tf Data Output Rise and Fall Times 20% to 80%; outputs terminated into 50 Ω; 10 mVPP input ps RATESEL = High – 90 110 RATESEL = Low – 150 200 Time from when rate select is asserted high or low until amplifier is performing at selected bandwidth – – 10 μs TRATESEL Rate select assert / deassert time TLOS_ON Time from LOS state until LOS output LOS assert time after 1 VPP input signal is turned off; is asserted signal detect level set to 10 mV 2.3 – 80 μs TLOS_OFF Time from non-LOS state until LOS is LOS deassert time after input crosses signal detect deasserted level; signal detect set to 10 mV with applied input signal of 20 mVPP 2.3 – 80 μs 5 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Table 1-4. M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 1-1. Preliminary - Rev V5P Data Input Requirements Differential Input DINP Note: For single-ended input connections. When connecting to the used input with ACcoupling, the unused input should be ACcoupled through 50 Ω to the supply voltage of the TIA; 4 - 1200 mV When connecting to the used input with DCcoupling, the unused input should be DCcoupled through 50 Ω to a voltage equal to the common mode level of the used input. DINN Single-ended Input DINP or DINN Unused Input 4 - 600 mV 6 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 2 - 600 mV M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Typical Eye Diagrams Figure 1-2. M02050 1.25 Gbps in Low Rate Mode 10 mVPP differential input 1.25 Gbps 160 mV/div 140 ps/div Figure 1-3. M02050 2.5 Gbps High Rate Mode 10 mVPP differential input 2.5 Gbps 150 mV/div 80 ps/div 7 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 1.5 Preliminary - Rev V5P M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P 2.0 Pin Definitions Pin Descriptions QFN Pin# Name Function 1 GND Ground. 2 VCC Power supply. Connect to either +5V or +3.3V. 3 PECLN Inverting PECL data output. 4 PECLP Non-inverting PECL data output. 5 IREF 6 STSET Loss of signal threshold setting input. Connect a 1% resistor between this pin and VCC3 to set loss of signal threshold. 7 VCC3 Power supply input for 3.3V applications or the output of the internally regulated 3.3V voltage when VCC = 5V. Connect directly to supply for 3.3V applications (internal regulator not in use). Do not connect to power supply if VCC = 5V. 8 RATESEL Rate select. When low or floating, the device is in low-rate mode (data rates ≤ 1.25 Gbps) and has reduced bandwidth. When high, the device is in full-rate mode with full bandwidth. Internal 80 kΩ resistor to ground. Drive with a current limited source as described in Section 4.1.4. 9 DINP Non-inverting data input. Internally terminated with 50 Ω to VTT. 10 DINN Inverting data input. Internally terminated with 50 Ω to VTT. 11 GND Ground. 12 RxAVGIN Average power monitor input. Connect to monitor output of TIAs that produce a current (sink) mirror replica of the photodiode current. Leave floating if not used. 13 JAM Output disable. When high, data outputs are disabled (with non-inverting output held high and inverting output held low). Connect to LOS output to disable outputs with loss of signal. Outputs are enabled when JAM is low or floating. Internal 150 kΩ resistor to ground. 14 LOS Loss of signal output. Goes high when input signal falls below threshold set by STSET. Open collector TTL with internal 80 kΩ pull-up resistor to VCC. 15 RSSIAVG Receiver average input power monitor. Provides a current source mirror of the current at RxAVGIN. Connect a resistor to ground to set the full scale voltage to the desired level at maximum average input power. 16 RSSIPP Receiver peak-to-peak input voltage monitor. Provides a DC voltage (ground referenced) proportional to the peak-topeak input voltage swing. 17 Center Pad Internal reference current. Must be connected to ground through a 12.1 kΩ 1% resistor. Ground. Must be connected to ground for proper operation. 8 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Table 2-1. M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 16 12 GND Center Pad Connect to GND PECLN DIN N 4 9 DIN P 8 VCC3 STSET 5 IREF RxAvgIN 9 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 1 VCC PECLP 13 RATESEL GND JAM LOS RSSIAVG M02050-15 Pinout - 16 Pin (3 x 3 mm) QFN Top View RSSIPP Figure 2-1. Preliminary - Rev V5P M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P 3.0 Functional Description Overview The M02050-15 is an integrated high-gain limiting amplifier. The M2050 features PECL outputs and is intended for use in applications to 2.5 Gbps. Full output swing is achieved even at minimum input sensitivity. The M02050-15 can operate with a 3.3V or 5V supply. Rate select is supported for SFP applications and/or to achieve optimum sensitivity at data rates ≤ 1.25 Gbps. When rate select is high, optimum sensitivity is achieved at 2.5 Gbps. The M02050-15 also includes two analog RSSI outputs proportional to either the average or peak to peak input signal and a programmable signal-level detector allowing the user to set thresholds at which the logic outputs are enabled. Figure 3-1. Block Diagram Example RATE SEL REF V TT DINP DINN Jam I Biasing Limiting Amplifier Output Buffer PECLP PECLN Offset cancel Level Detect RxAVGIN RSSI AVG Level Shift Threshold Setting Circuit STSET RSSIPP LOS Comparator Regulator V CC3 V CC 10 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 3.1 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps • • • • • • • • • • • Features Operates with a 3.3 or 5V supply 4 mV typical input sensitivity at 2.5 Gbps PECL outputs Rate Selection for ≤ 1.25 Gbps operation Average Receive power monitor output (RSSIAVG) Peak-to-peak Receive power monitor output (RSSIPP) On-chip DC offset cancellation circuit Low power (< 180 mW at 3.3V) Programmable CML Output Amplitude Level Output Jam Function 16 pin 3x3 QFN package 3.3 General Description The M02050-15 is a high-gain limiting amplifier for applications up to 2.5 Gbps, and incorporates a limiting amplifier, an input signal level detection circuit and also a fully integrated DC-offset cancellation loop that does not require any external components. The M02050-15 features PECL data outputs. The M02050-15 provides the user with the flexibility to set the signal detect threshold. Optional output buffer disable (squelch/jam) can be implemented using the JAM input. 3.3.1 Inputs The data inputs are internally connected to VTT via 50 Ω resistors, and generally need to be AC coupled. Referring to Figure 3-2, the nominal VTT voltage is 2.85V because of the internal resistor divider to VCC3, which means this is the DC potential on the data inputs. See the applications information section for further details on choosing the ACcoupling capacitor. 11 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 3.2 Preliminary - Rev V5P M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 3-2. Preliminary - Rev V5P CML Data Inputs V CC3 TT 50 Ω DINP 3.3.2 50 Ω 8.3 kΩ DINN DC Offset Compensation The M02050-15 contains an internal DC autozero circuit that can remove the effect of DC offsets without using external components. This circuit is configured such that the feedback is effective only at frequencies well below the lowest frequency of interest. The low frequency cut off is typically 25 kHz. 12 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 1.3 kΩ V M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 3.3.3 Preliminary - Rev V5P PECL Outputs The M02050-15 features 100k/300k PECL compliant outputs as shown in Figure 3-3. The outputs may be terminated using any standard AC or DC-coupling PECL termination technique. AC-coupling is used in applications where the average DC content of the data is zero e.g. SONET. The advantage of this approach is lower power consumption, no susceptibility to DC drive and compatibility with non-PECL interfaces. PECL Data Outputs VCC DOUTP DOUTN 50 Ω 50 Ω V CC - 2V 3.3.4 Loss of Signal (LOS) The M02050-15 features input signal level detection over an extended range. Using an external resistor, RST, between pin STSET and VCC3 (Figure 3-5) the user can program the input signal threshold. The signal detect status is indicated on the LOS output pin shown in Figure 3-4. The LOS signal is active when the signal is below the threshold value. The signal detection circuitry has the equivalent of 3.5 dB (typical) electrical hysteresis. 13 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Figure 3-3. M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 3-4. Preliminary - Rev V5P LOS Output VCC RST establishes a threshold voltage at the STSET pin as shown in Figure 3-5. Internally, the input signal level is monitored by the Level Detector (which also outputs the RSSIPP voltage). As described in the RSSIPP section, this voltage is proportional to the input signal peak to peak value. The voltage at STSET is internally compared to the signal level from the Level Detector. When the Level Detect voltage is less than V(STSET), LOS is asserted and will stay asserted until the input signal level increases by a predefined amount of hysteresis. When the input level increases by more than this hysteresis above V(STSET), LOS is deasserted. See the applications information section for the selection of RST. Note that STSET can be left open if the loss of signal detector function is not required. In this case LOS would be low. Figure 3-5. STset Input VCC3 VCC RST VSTSET STSET 14 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change LOS 80 kΩ M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 3.3.5 Preliminary - Rev V5P Peak to Peak Received Signal Strength Indicator (RSSIPP) The RSSIPP output voltage is logarithmically proportional to the peak to peak level of the input signal. It is not necessary to connect an external capacitor to this output. Internally, the RSSI voltage is compared with a user selectable reference to determine loss of signal as described in the previous section. Figure 3-6. RSSIPP Output RSSIPP 4 kΩ I(RSSIPP) 15 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change VCC M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 3-7. Preliminary - Rev V5P Typical RSSIPP Transfer Function 275 250 225 175 150 125 100 75 50 25 0 0 25 50 75 100 125 150 175 200 Differential Input Level (mVPP) 16 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change V(RSSIPP) (mV) 200 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 3-8. Preliminary - Rev V5P Typical RSSIPP Transfer Function (Low Input Level) 225 200 V(RSSIPP) (mV) 150 125 100 75 50 25 0 0 5 10 15 20 25 30 35 40 45 50 Differential Input Level (mVPP) 17 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 175 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 3-9. Preliminary - Rev V5P Typical RSSIPP Transfer Function (Log Scale) 275 250 225 175 150 125 100 75 50 25 0 1 3.3.6 10 Differential Input Level (mVPP) 100 JAM Function When asserted, the active high power down (JAM) pin forces the outputs to a logic “one” state. This ensures that no data is propagated through the system. The loss of signal detection circuit can be used to automatically force the data outputs to a high state when the input signal falls below the threshold. The function is normally used to allow data to propagate only when the signal is above the user's bit-error-rate requirement. It therefore inhibits the data outputs toggling due to noise when there is no signal present (“squelch”). In order to implement this function, LOS should be connected to the JAM pin shown in Figure 3-10, thus forcing the data outputs to a logic “one” state when the signal falls below the threshold. 18 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change V(RSSIPP) (mV) 200 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P Figure 3-10. JAM and RATESEL Input VCC R1 RATESEL R2 R1 = 55 kΩ for JAM, 30 kΩ for RATESEL R2 = 100 kΩ for JAM, 50 kΩ for RATESEL 3.3.7 Average Received Signal Strength Indicator (RSSIAVG) The RSSIAVG output current is a mirrored version of the RxAVGIN current from compatible TIAs. It sources rather than sinks the current making it compatible with DDMI type interfaces. Figure 3-11. RSSIAVG Output VCC RxAVGIN RSSIAVG REXT (From TIA) 19 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change JAM or M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 3.3.8 Preliminary - Rev V5P Voltage Regulation Preliminary Information—Subject to Change The M02050-15 contains an on-chip voltage regulator to allow both 5V and 3.3V operation. When used at 5V, the on-chip regulator is enabled and the digital inputs and outputs are compatible with TTL 5V logic levels. 20 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P 4.0 Applications Information • • • • Applications 2.5 Gbps STM-16/OC-48 SDH/SONET 1.06, 2.12 and 4.24 Gbps Fibre Channel 1.25 Gbps Ethernet 2.67 Gbps SDH/SONET with FEC Figure 4-1. Typical Applications Diagram 12.1 k Ω RATE SELControl +3.3 V Jam IREF RATE SEL V TT optional Biasing AC-Coupled to TIA DINP M02013 TIA Photodiode MON PECLP Limiting Amplifier Output Buffer DINN Clock Data Recovery Unit PECLN Offset cancel Level Detect RxAVGIN RSSIAVG REXT Level Shift Comparator Threshold Setting Circuit STSET RST Regulator RSSIPP AC or DC Coupled (as described in Applications Information) LOS V CC3 V CC 21 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 4.1 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps 4.1.1 Preliminary - Rev V5P Reference Current Generation The M02050-15 contains an accurate on-chip bias circuit that requires an external 12.1 kΩ 1% resistor, RREF, from pin IREF to ground to define an on-chip reference current. Figure 4-2. Reference Current Generation + IREF RREF 12.1 kΩ 4.1.2 Connecting VCC and VCC3 For 5V operation, the VCC pin is connected to an appropriate 5V ± 7.5% supply. No potential should be applied to the VCC3 pin. The only connection to VCC3 should be RST as shown in Figure 3-5. When VCC = 5V all logic outputs and the data outputs are 5V compatible while the CML data inputs are still referenced to 3.3V from the internal regulator (see Figure 3-2). For low power operation, VCC and VCC3 should be connected to an appropriate 3.3V ± 7.5% supply. In this case all I/Os are 3.3V compatible. 4.1.3 Choosing an Input AC-Coupling Capacitor When AC-coupling the input the coupling capacitor should be of sufficient value to pass the lowest frequencies of interest, bearing in mind the number of consecutive identical bits, and the input resistance of the part. For SONET data, a good rule of thumb is to chose a coupling capacitor that has a cut-off frequency less than 1/(10,000) of the input data rate. For example, for 2.5 Gbps data, the coupling capacitor should be chosen as: fCUTOFF ≤ (2.5x109 / 10x103) = 250x103 The -3 dB cutoff frequency of the low pass filter at the 50 Ω input is found as: f3dB = 1/ (2 * π * 50 Ω * CAC) so solving for C where f3dB = fCUTOFF CAC = 1/ (2 * π * 50 Ω * fCUTOFF) 22 EQ.1 and in this case the minimum capacitor is 12 nF. M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change VCC M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P For Ethernet or Fibre Channel, there are less consecutive bits in the data, and the recommended cut-off frequency is 1/(1,000) of the input data rate. This results in a minimum capacitor of 1.5 nF for 2.125 Gbps Fibre Channel. In this case, the input coupling capacitor needs to be large enough to pass 15 kHz (155x106/10,000) which results in a capacitor value of 0.2 μF. However, because this low pass frequency is close to the 25 kHz low pass frequency of the internal DC servo loop, it is preferable to use a larger input coupling capacitor such as 1 μF which provides an input cutoff frequency of 3.1 kHz. This separates the two poles sufficiently to allow them to be considered independent. This capacitor should also have a 10 nF capacitor in parallel to pass the higher frequency data (in the multirate application) without distortion. In all cases, a high quality coupling capacitor should be used as to pass the high frequency content of the input data stream. 4.1.4 Using Rate Selection Because of the performance of PECL outputs, the M02050-15 should not be used at data rates above 2.5 Gbps. When the RATESEL pin (shown in Figure 3-10) is driven high, the M02050-15 bandwidth is set to its maximum which allows the M02050-15 to operate at data rates up to 2.5 Gbps. Because of the nature of the ESD structure on this pin, if it is driven by a device with IOL or IOH > 2 mA then a 1 kΩ to 10 kΩ resistor should be used in series with the RATESEL pin. If rate selection is not used and the part is configured for high bandwidth only, the RATESEL pin should be connected to VCC using a 1 kΩ to 10 kΩ resistor. When operating at data rates ≤ 1.25 Gbps, then RATESEL should be left floating (do not tie low). This enables low-rate mode which reduces the bandwidth (and thus the noise level) of the part. 4.1.5 Using RSSIAVG As shown in the typical applications circuit (Figure 4-1), when interfacing to a TIA that features a “MON” output such as the M02013 or M02016, the M02050-15 can reference the current sunk into the TIA “MON” output and produce a proportional current at the M02050-15 RSSIAVG output. The current is sourced into resistor REXT to ground creating a voltage suitable for DDMI applications. REXT should be chosen as: REXT = 1/(maximum current into RSSIAVG) EQ.2 This keeps the voltage at RSSIAVG between 0 and 1 V. 4.1.6 Setting the Signal Detect Level Using Figure 4-3, the value for RST is chosen to set the LOS threshold at the desired value. The resulting hysteresis is also shown in Figure 4-3. From Figure 4-3, it is apparent that small variations in RST cause significant variation in the LOS threshold level, particularly for low input signal levels. This is because of the logarithmic relationship between the RSSI voltage and the input signal level. It is recommended that a 1% resistor be used for RST and that allowance is provided for LOS variation, particularly when the LOS threshold is near the sensitivity limit of the M02050-15. 23 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Multirate applications down to 155 Mbps M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P Example RST resistor values are given in Table 4-1. LOS Assert Levels for Various RST Resistor Values VIN (mV pp) differential RST (kΩ) 5.0 7.50 10.3 6.98 19.4 6.49 32.6 6.04 45.8 5.76 Figure 4-3. Loss of Signal Characteristic (Extended Range) 100 Conditions: 90 2.5 Gbps, 231 - 1 Threshold Level (mVPP) 80 Vcc = 3.3V, Temp = 25C 70 60 De-assert 50 Optical Hysteresis 40 = 10*log10(De-assert/Assert) 30 20 Assert 10 0 5.5 5.7 5.9 6.1 6.3 6.5 6.7 6.9 7.1 7.3 7.5 7.7 7.9 RST (kΩ) 24 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Table 4-1. M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 4-4. Preliminary - Rev V5P Loss of Signal Characteristic (Low Input Signal) 30 Conditions: 2.5 Gbps, 231 - 1 De-assert 20 Vcc = 3.3V, Temp = 25C Optical Hysteresis = 10*log10(De-assert/Assert) 15 10 Assert 5 0 6.5 6.7 6.9 7.1 7.3 RST (kΩ) 7.5 7.7 7.9 25 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Threshold Level (mVPP) 25 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 4-5. Preliminary - Rev V5P Loss of Signal Characteristic (High Input Level) Conditions: 100 2.5 Gbps, 231 - 1 90 Vcc = 3.3V, Temp = 25C De-assert 70 Optical Hysteresis = 10*log10(De-assert/Assert) 60 50 40 Assert 30 20 5.5 4.1.7 5.7 5.9 RST (kΩ) 6.1 6.3 6.5 PECLP and PECLN Termination The outputs of the M02050-15 are PECL compatible and any standard AC or DC-coupling termination technique can be used. Figure 4-6 and Figure 4-7 illustrate typical AC and DC terminations. AC-coupling is used in applications where the average DC content of the data is zero e.g. SONET. The advantage of this approach is lower power consumption, no susceptibility to DC drift and compatibility with non-PECL interfaces. Figure 4-6 shows the circuit configuration and Table 4-2 lists the resistor values. If using transmission lines other than 50 Ω, the shunt terminating resistance ZT should equal twice the impedance of the transmission line (ZO). DC-coupling can be used when driving PECL interfaces and has the advantage of a reduced component count. A Thevenin termination is used at the receive end to give a 50 Ω load and the correct DC bias. Figure 4-7 shows the circuit configuration and Table 4-2 the resistor values. Alternatively, if available, terminating to VCC - 2V as shown in Figure 4-8 has the advantage that the resistance value is the same for 3.3 V and 5 V operation and it also has performance advantages at high data rates. 26 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Threshold Level (mVPP) 80 M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps PECL Termination Resistor Values Supply Output Impedance RPULL-DOWN ZT RTA / RTB RT / RB 5V 50 Ω 270 Ω 100 Ω 2.7 kΩ / 7.8 kΩ 82 Ω / 130 Ω 3.3V 50 Ω 150 Ω 100 Ω 2.7 kΩ / 4.3 kΩ 130 Ω / 82 Ω Figure 4-6. AC-Coupled PECL Termination VCC VCC 0.1µF PECLP RTA Zo R TA ZT PECLN M02050 0.1µF Zo PECL RTB R TB RPULL-DOWN Figure 4-7. DC-Coupled PECL Termination VCC VCC 10 nF PECLP Zo RT RT PECL M02050 PECLN Zo RB RB 27 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Table 4-2. Preliminary - Rev V5P M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Figure 4-8. Preliminary - Rev V5P Alternative PECL Termination VCC VCC PECLP Zo M02050 PECLN Zo 50 Ω 50 Ω 10 nF VCC - 2V 28 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change PECL M02050-15 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps Preliminary - Rev V5P 5.0 Package Specification Package Information Note: View is for a 12 pin package. All dimensions in the tables apply for the 16 pin package 16 4 4 1.35 1.35 1.50 1.50 1.65 1.65 29 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change Figure 5-1. M02050-15 Preliminary - Rev V5P M/A-COM Technology Solutions Inc. All rights reserved. Information in this document is provided in connection with M/A-COM Technology Solutions Inc ("MACOM") products. These materials are provided by MACOM as a service to its customers and may be used for informational purposes only. Except as provided in MACOM's Terms and Conditions of Sale for such products or in any separate agreement related to this document, MACOM assumes no liability whatsoever. MACOM assumes no responsibility for errors or omissions in these materials. MACOM may make changes to specifications and product descriptions at any time, without notice. MACOM makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE AND/OR USE OF MACOM PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. MACOM FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. MACOM SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS. MACOM products are not intended for use in medical, lifesaving or life sustaining applications. MACOM customers using or selling MACOM products for use in such applications do so at their own risk and agree to fully indemnify MACOM for any damages resulting from such improper use or sale. 30 M/A-COM Technology Solutions Inc. (MACOM) and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. Visit www.macom.com for additional data sheets and product information. For further information and support please visit: http://www.macom.com/support Preliminary Information—Subject to Change 3.3/5V Limiting Amplifier for Aplications to 2.5 Gbps