MAX3761/MAX3762 19-1097 Rev 4 8/08 Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs General Description Features The MAX3761/MAX3762 limiting amplifiers, with 4mV Chatter-Free Power Detector with Programmable sensitivity and PECL data outputs, are optimized for Loss-of-Signal Outputs operation in low-cost, 622Mbps, LAN/ATM LAN fiber 4mV Input Sensitivity optics applications. PECL Data Outputs An integrated power detector senses the input signals amplitude. A received-signal-strength indicator (RSSI) Single 5V Power Supply gives an analog indication of the power level, while the complementary loss-of-signal (LOS) outputs indicate if 250ps Output Edge Speed the input power level exceeds the programmed Low 15ps Pulse-Width Distortion threshold level. The LOS threshold can be adjusted to detect signal amplitudes between 3mVp-p and TTL Loss-of-Signal Interface LogicMAX3761 100mVp-p, providing a 15dB LOS adjustment in fiber PECL Loss-of-Signal Interface LogicMAX3762 optic receivers. The LOS outputs have 3.5dB of hysteresis, which prevents chatter when input signal levels are small. The MAX3761s LOS outputs are com- Ordering Information patible with TTL-logic levels. The MAX3762 has PECL LOS outputs. PART TEMP RANGE PIN-PACKAGE DISABLE and LOS can be used to implement a squelch MAX3761EEP+ -40C to +85C 20 QSOP function, which turns off the data outputs when the MAX3761E/D -40C to +85C Dice* input signal is below the programmed threshold. MAX3762EEP+ -40C to +85C 20 QSOP MAX3762E/D -40C to +85C Dice* *Dice are designed to operate from -40C to +85C, but are Applications tested and guaranteed only at T = +25C. A +Denotes a lead-free/RoHS-compliant package. 622Mbps LAN/ATM LAN Receivers 155Mbps LAN/ATM LAN Receivers Pin Configuration Typical Operating Circuits C TOP VIEW AZ +5V V CZP CC 150pF CZN EN FILTER DISABLE 1 20 10nF DISABLE RSSI RSSI 2 LOS+ 19 LOS+ VCCO EN LOS- 3 18 LOS- C 100pF IN V 5.6nF CC 4 V BYPASS OUT- 17 CC SUPPLY VIN+ MAX3761 VIN+ OUT+ 5 16 VCCO 50 C MAX3762 IN VIN- OUT+ 6 15 5.6nF MAX3761 50 VIN- GND 7 14 OUT- GNDO FILTER V - 2V SUB GND CC 8 13 GNDO C 100pF FILTER SUB CZP VTH INV 9 12 VTH +V CC CZN INV 10 11 R1 R2 100k 22k QSOP MAX3762 at end of data sheet. 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. EVALUATION KIT AVAILABLELow-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs ABSOLUTE MAXIMUM RATINGS V , VCCO............................................................-0.5V to +7.0V Operating Junction Temperature Range...........-40C to +150C CC FILTER, RSSI, EN, VIN+, VIN-, CZP, CZN, Processing Temperature (die) .........................................+400C DISABLE, LOS+, LOS-, INV, VTH...............-0.5V to (V + 0.5V) Storage Temperature Range .............................-65C to +160C CC PECL Output Current (OUT+, OUT-, LOS+, LOS-) ............50mA Lead Temperature (soldering, 10sec) .............................+300C Continuous Power Dissipation (T = +85C) A QSOP (derate 9.1mW/C above +85C).......................591mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation 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. DC ELECTRICAL CHARACTERISTICS (V = +4.5V to +5.5V, DISABLE = low, T = -40C to +85C, unless otherwise noted. Typical values are at V = +5.0V, T = +25C.) CC A CC A (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS MAX3761, I 25 37 VCC Power-Supply Current mA MAX3762, I 30 46 VCC LOS Output TTL High MAX3761 2.8 V (T = +25C to +85C) 0.40 A LOS Output TTL Low MAX3761 V (T = -40C to +25C) 0.44 A LOS Output PECL High MAX3762 (Notes 2, 3) -1150 -880 mV LOS Output PECL Low MAX3762 (Notes 2, 3) -1830 -1555 mV DISABLE Input Current Logic high 100 A DISABLE Input High MAX3761 2.65 V DISABLE Input Low MAX3761 0.8 V DISABLE Input PECL High MAX3762 (Note 3) -1160 mV DISABLE Input PECL Low MAX3762 (Note 3) -1470 mV PECL Data Output Voltage High (V ) (Notes 2, 3) -1150 -880 mV OH PECL Data Output Voltage Low (V ) (Notes 2, 3) -1830 -1555 mV OL Disabled Differential Output DISABLE = high -100 100 mV Disabled Common-Mode Output DISABLE = high V - 0.7 V -1.2 V CC CC Note 1: Dice are tested at T = +25C. A Note 2: Outputs terminated with 50 to V - 2V. CC Note 3: Voltage measurements are relative to V . CC 2 MAX3761/MAX3762