LTC6561HUF#PBF

Overview

The LTC6561HUF#PBF is a low-noise four-channel transimpedance amplifier with integrated output multiplexing, designed for LIDAR receivers using Avalanche Photodiodes. It features a 220MHz -3dB bandwidth and 74kΩ transimpedance gain. The device operates on a single 5V supply, consuming 200mW. Key electrical parameters include a 4.8pA/√Hz input current noise density at 200MHz with 2pF capacitance, a linear input range of 0µA to 30µA, and fast overload recovery of 12ns. It provides a 2VP-P output swing on a 100Ω load and is housed in a 4mm × 4mm 24-lead QFN package.

Feature Summary

• Integrates four transimpedance amplifiers with a 4-to-1 input multiplexer and an output multiplexer for scalable channel expansion.
• Delivers high-speed performance with 220MHz bandwidth and rapid channel switchover times under 50ns.
• Optimized for low-noise detection with minimal input current noise density and fast overload recovery from saturation events.
• Features a compact leadless QFN package with an exposed thermal pad for efficient heat dissipation.

Applications

• LIDAR receivers utilizing Avalanche Photodiode arrays
• Industrial imaging systems requiring multi-channel signal acquisition

Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when ordering. Confirm the H grade ensures operation across the full industrial temperature range of -40°C to +125°C. Ensure compatibility with automotive requirements by selecting the appropriate #WPBF variant if AEC-Q100 qualification is mandatory for the target application environment.

Selection Notes

Select this component for applications demanding high channel density without external multiplexers. The internal MUX reduces board space and power consumption compared to discrete solutions. Consider the 74kΩ gain and 220MHz bandwidth trade-offs against total input capacitance to ensure adequate pulse fidelity for the specific photodiode sensor used.

Part Context

This part belongs to the LTC6561 family of four-channel transimpedance amplifiers. It is distinct from single-channel variants like the LTC6560 and higher-bandwidth models such as the LTC6563. The HUF designation specifies the plastic QFN package and extended temperature range capabilities within the Analog Devices portfolio.

Replacement Considerations

Direct functional substitutes within the same family include the LTC6561IUF#PBF for commercial temperature ranges or the LTC6561HUF#WPBF for automotive-grade reliability. For higher bandwidth requirements, the LTC6563HUDDM#PBF offers 600MHz performance but requires different supply voltage considerations.