Analog Devices Inc./Maxim Integrated MAX3262CAG

Overview

The MAX3262CAG from Maxim Integrated is a high-speed limiting amplifier designed for post-amplification in fiber-optic receivers operating up to 1 Gbps. It delivers 48 dB maximum gain, 900 MHz bandwidth, and programmable loss-of-signal (LOS) detection with 9–48 mV_p-p sensitivity range, enabling reliable interface with PECL-input devices in Fibre Channel and SONET systems.

For engineers reviewing the MAX3262CAG datasheet, MAX3262CAG pinout, MAX3262CAG application, or MAX3262CAG equivalent, this device is selected for high-fidelity signal restoration in optical data links where dynamic input range, chatter-free LOS assertion, and precise threshold control are critical design requirements.

Technical Context

The MAX3262CAG employs a fully differential architecture with five independent supply domains (VCCA, VCCB, VCCC, VCCD, VCCE) and dedicated ground paths to isolate input, gain, output, and LOS circuitry-minimizing crosstalk and enabling stable operation at 1 Gbps. Its offset-correction loop, stabilized by external 100–330 nF capacitor between CZP and CZN pins, reduces input-referred offset without degrading pulse-width distortion.

LOS detection uses a rectifying peak detector sampling the output-stage signal, with threshold set via dual-stage gain control: coarse adjustment (6 dB) via DIV2 pin (grounded/open), and fine adjustment (0–11 dB) via analog VLOS voltage (3.0–5.0 V), yielding nominal 3.0 dB hysteresis across the full 9–48 mV_p-p sensitivity range.

Key Specifications

Pinout & Package

MAX3262CAG is housed in a 24-pin SSOP (Shrink Small Outline Package) with 0.635 mm pitch, optimized for high-frequency layout: five ground pins (pins 8, 13, 14, 20, 24), six V_CC supply pins (pins 1, 5, 15, 12, 21, 23), and segregated power domains per functional block.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar limiting amplifier applications.

Compared with MAX3262CAG, MAX3260CAG offers reduced gain and no LOS programmability-making it suitable only for legacy 622 Mbps systems-while SY88302ALKG provides higher speed and CDR but demands full schematic and layout revision due to differing voltage, pinout, and signal integrity requirements.

Availability

MAX3262CAG is available at Aetrix Electronics and suitable for Fibre Channel receivers, SONET OC-12 interfaces, and optical transceiver modules requiring stable component supply across industrial temperature ranges (0°C to +70°C).

Supply support for MAX3262CAG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-speed ICs for communications, computing, and industrial applications.

The MAX3262CAG belongs to Maxim's high-speed optical receiver IC product line, engineered specifically for fiber-optic post-amplification with integrated, chatter-free loss-of-signal monitoring in 1 Gbps data links.

FAQ

What is the operating temperature range for the MAX3262CAG?

The MAX3262CAG is specified for operation from 0°C to +70°C ambient temperature (T_A). This commercial-grade rating aligns with standard optical module environments. The device's internal junction temperature can reach up to +150°C, but thermal design must ensure ambient conditions remain within the 0°C to +70°C range to guarantee all electrical parameters-including 48 dB gain, 900 MHz bandwidth, and 3.0 dB LOS hysteresis-as specified in the datasheet. Derating applies above +70°C ambient.

How is the loss-of-signal threshold programmed on the MAX3262CAG?

The MAX3262CAG implements dual-stage LOS threshold programming: coarse adjustment via the DIV2 pin (grounded = +11 dB input gain; open = +6 dB), and fine adjustment via analog voltage on VLOS (3.0–5.0 V). Together, they set the input sensitivity range from 9 mV_p-p to 48 mV_p-p. For example, grounding DIV2 and applying 3.4 V to VLOS yields ~15 mV_p-p LOS assertion. The resulting hysteresis remains nominally 3.0 dB regardless of setting, ensuring stable open-fiber detection.

What output termination is required for the MAX3262CAG's DOUT+ and DOUT− pins?

The MAX3262CAG's DOUT+ and DOUT− pins require termination to (V_CC − 2 V) using a 50 Ω Thevenin-equivalent network-typically implemented as two 100 Ω resistors (one from each output to V_CC − 2 V) or a single 50 Ω resistor to that voltage. This matches PECL logic levels and ensures proper signal swing (≥350 mV_p-p) and edge fidelity. Termination to ground or V_CC alone violates the output stage specification and degrades jitter and eye diagram performance in the MAX3262CAG.

Can the MAX3262CAG be used with a 3.3 V supply?

No, the MAX3262CAG is designed exclusively for +5 V operation. Absolute maximum ratings specify V_CC − V_EE ≤ 6.0 V, and all AC/DC specifications-including 48 dB gain, 900 MHz bandwidth, and 80 µV input noise-are characterized only at V_CC = 5.0 V. Operation at 3.3 V falls outside guaranteed performance and risks failure to meet 1 Gbps timing or LOS accuracy requirements. For 3.3 V systems, consider alternatives like the SY88302ALKG, but note its pinout and biasing differ from the MAX3262CAG.

What external components are mandatory for stable operation of the MAX3262CAG?

Three external components are mandatory for stable MAX3262CAG operation: (1) a 100–330 nF capacitor between CZP (Pin 3) and CZN (Pin 4) to stabilize the offset-correction loop; (2) AC-coupling capacitors (e.g., 100 pF) on DIN+ and DIN− (Pins 6, 7) to enable DC offset correction; and (3) pull-up resistors (≥3.3 kΩ) on LOS+ and LOS− (Pins 17, 16) for open-collector output interfacing. Omitting any of these compromises LOS chatter immunity, input offset cancellation, or output logic compatibility in the MAX3262CAG.