Analog Devices Inc./Maxim Integrated MAX3760ESA

Overview

The MAX3760ESA from Maxim Integrated is a 622Mbps transimpedance preamplifier IC designed for optical receiver front-ends in ATM LAN/WAN systems. It delivers 6.5kΩ transimpedance gain, 560MHz bandwidth, and 73nA input-referred RMS noise, enabling -31.5dBm typical sensitivity at 1300nm with single +5V supply operation and 100mW power consumption.

For engineers reviewing the MAX3760ESA datasheet, MAX3760ESA pinout, MAX3760ESA application, or MAX3760ESA equivalent, this device serves as a low-noise, DC-cancellation-enabled TIA for high-speed fiber-optic receivers requiring precise pulse-width distortion control, differential output swing, and extended temperature operation from -40°C to +85°C.

Technical Context

The MAX3760ESA integrates a shunt-feedback transimpedance amplifier, a paraphase stage providing 2× voltage gain and differential emitter-follower outputs, and an internally compensated DC cancellation loop that reduces low-frequency drift and pulse-width distortion across wide input current ranges (up to 1mA_P-P). Its architecture centers the photodiode current signal within the dynamic range using low-frequency feedback via the COMP pin.

It operates with photodiode cathode biased to VCC and requires INREF connected directly to photodetector AC ground for optimal noise and bandwidth performance. The SO package contributes ~0.3pF input capacitance, and the design is optimized for total source capacitance of 0.75pF - matching low-cost TO-header photodiodes.

Key Specifications

Pinout & Package

The MAX3760ESA is housed in an 8-pin SOIC (SO) package with standard .150" width, JEDEC MS012 outline, and 1.27mm pitch. Pin 1 is marked by a beveled corner or dot; the package is RoHS-compliant and rated for reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX3760ESA, the LMH6521 offers wider bandwidth but higher noise and no DC cancellation-making it less suitable for ATM/SONET sensitivity-critical applications-while the MAX3761 is a functional complement, not an alternative, as it performs limiting rather than transimpedance conversion.

Availability

MAX3760ESA is available at Aetrix Electronics and suitable for 622Mbps optical receiver modules, SONET/SDH line cards, and fiber-access terminals requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for MAX3760ESA 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and RF solutions for communications, computing, and industrial markets.

The MAX3760ESA belongs to Maxim's optical receiver front-end product line, engineered specifically for 622Mbps ATM/SONET applications where low-noise transimpedance gain, DC cancellation, and differential output integrity are essential.

FAQ

What is the primary function of the MAX3760ESA in an optical receiver?

The MAX3760ESA functions as a transimpedance preamplifier that converts weak photodiode current signals (e.g., from 1300nm PIN diodes) into clean, differential voltage outputs for downstream limiting amplification. Its 6.5kΩ gain, 560MHz bandwidth, and integrated DC cancellation enable high-sensitivity, low-distortion operation at 622Mbps - making the MAX3760ESA ideal for SONET OC-12 and ATM LAN/WAN optical receivers.

Does the MAX3760ESA require external compensation components?

The MAX3760ESA is internally compensated for standard 622Mbps operation, so no external components are needed for basic functionality. However, the COMP pin allows optional external capacitor addition to adjust the DC cancellation loop's low-frequency cutoff - useful for optimizing data-dependent jitter in specific system conditions. Leaving COMP open enables default operation; connecting it to GND disables DC cancellation entirely.

What photodiode biasing configuration is required for proper MAX3760ESA operation?

The MAX3760ESA requires the photodiode cathode to be connected to VCC and the anode to IN, with INREF tied directly to the photodiode's AC ground return. This configuration enables the internal DC cancellation circuit to function correctly. Reversing the diode (anode to GND, cathode to IN) disables DC cancellation and causes unacceptable pulse-width distortion - a critical design constraint for reliable MAX3760ESA operation.

How does input capacitance affect MAX3760ESA performance?

Input capacitance directly degrades MAX3760ESA bandwidth and increases input-referred noise. The device is optimized for 0.75pF total source capacitance (including photodiode, package, and PCB parasitics). In the SO package, intrinsic capacitance is ~0.3pF; exceeding the 0.75pF target reduces bandwidth below 560MHz and raises noise above 73nA RMS - both compromising sensitivity and eye opening. Layout must minimize trace length and remove ground/power planes under the IN node.

Can the MAX3760ESA drive a 50Ω single-ended load?

No, the MAX3760ESA is not designed to drive a 50Ω single-ended load to ground. Its output stage consists of emitter followers configured for 100Ω differential termination between OUT+ and OUT-. Driving a 50Ω load to ground violates the output stage's biasing and may cause distortion or damage. For best noise immunity and signal integrity, the MAX3760ESA must be terminated differentially into 100Ω - as specified in all AC electrical characteristics and application circuits for the MAX3760ESA.