TPA8304-QF4R-S

Overview

The TPA8304-QF4R-S is a logarithmic detector optimized for low-frequency signal power measurement in fiber optic systems, housed in a QFN3x3-16 package. It operates on a single positive supply of 4.5 V to 5.5 V and supports a specified current range of 1 nA to 10 mA with a functional input down to 100 pA. The device features a basic logarithmic intercept at 100 pA and a slope of 200 mV/decade at the VLOG pin. It offers a low conformance error of 0.2 dB from 10 nA to 10 mA and includes a fast step response with rising times as low as 0.2 μs.

Feature Summary

• Optimized for fiber optic photodiode interfacing with adaptive bias control
• Provides wide dynamic range with high accuracy and fast step response
• Supports single-supply operation with low quiescent current and power-down mode

Applications

• High-accuracy optical power measurement
• Wide-range baseband log compression
• Versatile detector for APC loops
• EDFA

Procurement Notes

Verify the specific ordering suffix '-S' indicates tape and reel packaging with a quantity of 4000 units per reel. Confirm the operating temperature range is -40°C to 85°C. Ensure the component meets RoHS compatibility and halogen-free requirements as defined by the manufacturer's green product standards. Cross-reference the package marking 'A8304' for identification.

Selection Notes

Select this component when designing systems requiring precise logarithmic conversion of photodiode currents over a wide dynamic range. It is suitable for applications needing fast transient response and low conformance error. Consider the QFN3x3-16 package for compact designs. Verify that the single-supply voltage range matches the system power architecture.

Part Context

The TPA8304 is part of 3PEAK's portfolio of specialized function circuits designed for optical communication systems. It serves as a logarithmic converter capable of handling large signal variations. The QFN3x3-16 variant provides a compact surface-mount solution suitable for dense PCB layouts while maintaining thermal performance through an exposed thermal pad.

Replacement Considerations

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