MAX3746

Power-Supply Voltage (V_CC) ...............................-0.5V to +4.5V
Voltage at IN+, IN- ........................(V_CC - 2.4V) to (V_CC + 0.5V)
Voltage at DISABLE, OUTPOL, RSSI,
LOS, TH.....................................................-0.5V to (V_CC + 0.5V)
Current into LOS...................................................1mA to +9mA
Differential Input Voltage (IN+ - IN-) .................................2.5V
Continuous Current at CML Outputs
(OUT+, OUT-) ..................................................-25mA to +25mA
Continuous Power Dissipation (TA = + 70°C)
16-Pin QFN (derate 17.7mW above +70°C) .....................1.4W
Operating Junction Temperature Range (TJ).-55°C to +150°C
Storage Ambient Temperature Range (Ts) ...-55°C to +150°CStresses 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.

The MAX3746 multirate limiting amplifier functions as a data quantizer for SONET, Fibre-Channel, and Gigabit Ethernet optical receivers. The amplifier accepts a wide range of input voltages and provides selectable-level, current-mode logic (CML) output voltages with controlled edge speeds. A received-signal-strength indicator (RSSI) is available when the MAX3746 is DC-coupled to the MAX3744/MAX3724 SFP transimpedance amplifier (TIA). A receiver consisting of the MAX3744/MAX3724 and the MAX3746 can provide up to 19dB RSSI dynamic range. Additional features include a programmable loss-of-signal (LOS) detect, an optional disable function (DISABLE), and an output-signal polarity reversal (OUTPOL). Output disable can be used to implement squelch.

The combination of the MAX3746 and the MAX3744/ MAX3724 allows for the implementation of all the smallform- factor SFF-8472 digital diagnostic specifications using a standard 4-pin TO-46 header.

The MAX3746 is pin-for-pin compatible with the MAX3748A limiting amplifier and consumes 30% less power. The MAX3746 is packaged in a 3mm x 3mm, 16-pin QFN package.