19-5954 Rev 0 7/11 E V A L U A T I O N K I T A V A I L A B L E MAX3748H Compact, Low-Power, 155Mbps to 4.25Gbps Limiting Amplifier General Description Features The MAX3748H multirate limiting amplifier functions as S SFP Reference Design Available a data quantizer for SONET, Fibre Channel, and Gigabit S 16-Pin TQFN Package with 3mm x 3mm Footprint Ethernet optical receivers. The amplifier accepts a wide S Single 3.3V Supply Voltage range of input voltages and provides constant-level S 86ps Rise and Fall Time current-mode logic (CML) output voltages with controlled edge speeds. S Loss of Signal with Programmable Threshold A received-signal-strength indicator (RSSI) is available S RSSI Interface (with MAX3744 TIA) when the MAX3748H is combined with the MAX3744 S Output Disable SFP transimpedance amplifier (TIA). A receiver consist- S Polarity Select ing of the MAX3744 and the MAX3748H can provide up to 19dB RSSI dynamic range. Additional features include S 8.7ps Deterministic Jitter (4.25Gbps) P-P a programmable loss-of-signal (LOS) detect, an optional disable function (DISABLE), and an output signal polar- Applications ity reversal (OUTPOL). Output disable can be used to Gigabit Ethernet SFF/SFP Transceiver Modules implement squelch. Fibre Channel SFF/SFP Transceiver Modules The combination of the MAX3748H and the MAX3744 allows for the implementation of all the small-form-factor Multirate OC-3 to OC-48-FEC SFF/SFP SFF-8472 digital diagnostic specifications using a stan- Transceiver Modules dard 4-pin TO-46 header. The MAX3748H is packaged in a 3mm x 3mm, 16-pin thin QFN package with an exposed Ordering Information appears at end of data sheet. pad. Typical Operating Circuits SFP OPTICAL RECEIVER HOST BOARD SUPPLY FILTER HOST FILTER 4-PIN TO HEADER 0.1F V CC RX OUTPOL V CAZ1 CAZ2 CC 0.1F IN+ OUT+ 50 SerDes 0.1F MAX3744 TIA IN- OUT- 50 MAX3748H GND RSSI TH DISABLE LOS 4.7k TO 10k DS1858 V CC HOST R TH 3-INPUT DIAGNOSTIC MONITOR R1 C1 LOS 3k 0.1F Typical Operating Circuits continued at end of data sheet. For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX3748H.related Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX3748H Compact, Low-Power, 155Mbps to 4.25Gbps Limiting Amplifier ABSOLUTE MAXIMUM RATINGS Power-Supply Voltage Range (V ) ....................-0.5V to +6.0V Continuous Power Dissipation (T = +70C) CC A Voltage Range at IN+, IN- ............. (V - 2.4V) to (V + 0.5V) TQFN (derate 17.7mW above +70C) .............................1.4W CC CC Voltage Range at DISABLE, OUTPOL, Operating Junction Temperature Range (T ) .. -55C to +150C J RSSI, CAZ1, CAZ2, LOS, TH ................ -0.5V to (V + 0.5V) Storage Ambient Temperature Range (T ) ...... -55C to +150C CC S Current Range into LOS ...................................... -1mA to +9mA Lead Temperature (soldering, 10s) ................................+260C Differential Input Voltage (IN+ - IN-) ....................................2.5V Soldering Temperature (reflow) ......................................+260C Continuous Current Range at CML Outputs (OUT+, OUT-) .............................................. -25mA to +25mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 2.97V to 3.63V, ambient temperature = -40C to +85C, CML output load is 50 to V , C = 0.1F, typical values are CC CC AZ at T = +25C, V = 3.3V, unless otherwise specified. The data input transition time is controlled by a 4th-order Bessel filter with A CC f = 0.75 x 2.667GHz for all data rates of 2.667Gbps and below, and with f = 0.75 x data rate for data rates > 3.2Gbps.) -3dB -3dB PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Single-Ended Input Resistance Single-ended to V (Note 1) 42 50 58 I CC Input Return Loss Differential, f < 3GHz, DUT is powered on 13 dB Input Sensitivity V (Note 2) 5 mV IN-MIN P-P Input Overload V (Note 2) 1200 mV IN-MAX P-P Single-Ended Output Resistance Single-ended to V (Note 1) 42 50 58 I CC Output Return Loss Differential, f < 3GHz, DUT is powered on 10 dB Differential Output Voltage 600 780 1200 mV P-P Differential Output Signal when Outputs AC-coupled, V applied to IN-MAX 10 mV P-P Disabled input (Note 1) K28.5 pattern at 4.25Gbps 8.7 25 K28.5 pattern at 3.2Gbps 8.5 25 23 Deterministic Jitter 2 - 1 PRBS equivalent pattern at 2.7Gbps DJ 9.3 30 ps P-P (Notes 1, 3) (Note 4) K28.5 pattern at 2.1Gbps 7.8 25 23 2 - 1 PRBS equivalent pattern at 155Mbps 25 55 Input = 5mV 6.5 Random Jitter P-P ps RMS (Note 5) Input = 10mV 3 P-P 20% to 80%, 4.25Gbps, 3.1875GHz Bessel 60 input filter, V = 20mV Data Output Transition Time IN P-P ps 20% to 80% (Note 1) 86 115 Input-Referred Noise 185 FV RMS C = open 70 AZ Low-Frequency Cutoff kHz C = 0.1FF 0.8 AZ (Note 6) 32 49 Power-Supply Current I mA CC LOS disabled 37 Power-Supply Noise Rejection PSNR f < 2MHz 26 dB Maxim Integrated Products 2