ADL5309ACBZ

Overview

The ADL5309ACBZ is a dual-channel logarithmic transimpedance amplifier designed for measuring low-frequency and wide dynamic range optical signal power in fiber optic systems. It features an electrical dynamic range of 188 dB (10 pA to 25 mA) and an optical dynamic range of 94 dB. The device provides accurately trimmed logarithmic responses with a slope of 200 mV/decade and conformance error within ±0.4 dB over temperature. It includes integrated LDO, I2C adjustable photodiode biasing, and a 14-bit ADC for digital output. Operating from 2.85 V to 5.25 V, it is housed in a 20-lead WLCSP package.

Feature Summary

• Dual-channel current inputs optimized for direct optical gain measurements
• Accurately trimmed logarithmic response with offset trimming at 70°C to reduce dark current
• Integrated LDO providing 26 dB PSRR at 60 Hz and 100 pA input current
• I2C adjustable photodiode bias voltage and noise-response time trade-off

Applications

• Automatic test equipment
• Optical power monitoring
• Machine automation
• Optical modules

Procurement Notes

Verify the specific suffix ACBZ against the manufacturer's official ordering guide to confirm package type and temperature grade. Confirm availability status as distribution channels may list limited stock or end-of-life statuses. Ensure the I2C address configuration via the SBA pin aligns with system bus requirements before finalizing procurement.

Selection Notes

Select this component when high accuracy over a wide dynamic range is required for optical power sensing. The dual-channel architecture supports differential optical gain measurements. Consider the 20-lead WLCSP package constraints for PCB layout. Verify that the supply voltage range of 2.85 V to 5.25 V matches the system power rails.

Part Context

The ADL5309 belongs to Analog Devices' family of logarithmic converters. It is specifically engineered for fiber optic applications requiring precise measurement of photon-generated currents. The device integrates both analog logarithmic amplification and digital conversion capabilities into a single compact package.

Replacement Considerations

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