MAX3748A

Gigabit Ethernet SFF/SFP Transceiver Modules
Fibre Channel SFF/SFP Transceiver Modules
Multirate OC-3 to OC-48-FEC SFF/SFP
Transceiver Modules

Power-Supply Voltage (V_CC) .................................-0.5V to +6.0V
Voltage at IN+, IN- ...........................(V_CC - 2.4V) to (V_CC + 0.5V)
Voltage at DISABLE, OUTPOL, RSSI,
  CAZ1, CAZ2, 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 (T_A = +70°C)
  16-Pin QFN (derate 17.7mW above +70°C) .....................1.4W
Operating Junction Temperature Range (T_J) ..-55°C to +150°C
Storage Ambient Temperature Range (T_s)......-55°C to +150°C

The MAX3748/MAX3748A 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 constantlevel current-mode logic (CML) output voltages with controlled edge speeds.

A received-signal-strength indicator (RSSI) is available when the MAX3748/MAX3748A is combined with the MAX3744 SFP transimpedance amplifier (TIA). A receiver
consisting of the MAX3744* and the MAX3748/MAX3748A 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 MAX3748/MAX3748A and the MAX3744 allows for the implementation of all the smallform-factor SFF-8472 digital diagnostic specifications using a standard 4-pin TO-46 header. The MAX3748/MAX3748A is packaged in a 3mm × 3mm 16-pin QFN package with an exposed pad.