LTC6561IUF#PBF

Overview

The LTC6561IUF#PBF is a low-noise four-channel transimpedance amplifier with integrated multiplexing, designed for LIDAR receivers using Avalanche Photodiodes. It features a 220MHz bandwidth and 74kΩ transimpedance gain. The device operates on a single 5V supply with 200mW power dissipation. Input current noise density is 4.8pA/√Hz at 200MHz with 2pF capacitance. It supports fast overload recovery of 12ns and channel switchover under 50ns. The component is housed in a compact 4mm × 4mm 24-lead QFN package.

Feature Summary

• Integrates four transimpedance amplifiers with a 4-to-1 input multiplexer to simplify system design.
• Features an output multiplexer capability allowing multiple devices to combine into larger channel arrays.
• Provides fast overload recovery and rapid channel switching suitable for high-speed optical detection.
• Includes internal protection circuitry to withstand large saturation currents without phase reversal.

Applications

• LIDAR receivers
• Industrial imaging systems

Procurement Notes

Verify the specific suffix IUF#PBF corresponds to the industrial temperature range (-40°C to 85°C) and tube packaging. Confirm that the ordering code matches the exact pinout and thermal pad requirements for your PCB layout. Ensure compatibility with the required supply voltage and reference voltage configurations before finalizing procurement.

Selection Notes

Select this component when designing multi-channel APD interfaces requiring minimal external multiplexing. Consider the 220MHz bandwidth and low noise characteristics for high-resolution time-of-flight applications. Evaluate the total input capacitance impact on bandwidth and ensure the 5V single-supply operation fits within the system power budget constraints.

Part Context

This part belongs to the LTC6561 family of multiplexed transimpedance amplifiers manufactured by Analog Devices. It is specifically engineered for applications demanding high-speed signal processing from photodiode arrays. The device integrates both input and output multiplexing functions to reduce board space and component count in complex sensor systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the device handle large overload currents?

The LTC6561 can survive overload currents exceeding 1mA and recovers in less than 12ns without phase reversal, minimizing data loss during saturation events.

What is the purpose of the O_MUX pin?

The O_MUX pin controls the output multiplexer, allowing multiple LTC6561 devices to be combined. When driven high, it isolates the outputs; when low, it enables the output for master/slave channel expansion.