ADL5309

RECOMMENDED FOR NEW DESIGNS

Dual, 188 dB Range, 10 pA to 25 mA, Logarithmic Converter

Data Sheet (Rev. A) Product Selection Table

Part Models: 3
1ku List Price: Starting From $16.91

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Overview

188 dB electrical dynamic range and 94 dB optical dynamic range
Dual-channel current inputs for direct optical gain measurements
Accurately trimmed logarithmic response:
- Logarithmic slope 200 mV/decade
- Logarithmic conformance error ±0.4 dB over temperature
- Offset trimmed at 70°C to reduce dark current

Integrated LDO: 26 dB PSRR at 60 Hz and 100 pA input current (V_CC = 3.0 V)
I²C adjustable:
- Photodiode bias voltage
- Trade-off between noise and response time at low input currents
Integrated 14-bit ADC
Requires minimal external components
2.040 mm × 1.640 mm, 20-lead WLCSP

The ADL5309 contains dual monolithic logarithmic transimpedance amplifiers that are optimized for measuring low-frequency and wide dynamic range optical signal power in fiber optic systems.

The device produces highly accurate, temperature compensated output voltages that are proportional to the logarithm of the ratio between the input current at the INP1 and INP2 pins and the internally generated reference currents. The logarithmic slope and intercept are both accurately trimmed to a nominal value of 200 mV/decade and 10 pA, respectively. The low-impedance OUT1 and OUT2 logarithmic outputs have the capability to drive a wide range of analog-to-digital converters (ADCs) and other circuits.

A digital representation of the OUT1 and OUT2 outputs is available through the inter-IC bus (I2C) interface. A 14-bit successive approximation register (SAR) ADC, controlled through the I2C interface, samples the OUT1 and OUT2 channel outputs along with a built-in digital temperature sensor.

Adaptive photodiode biasing is supported through the PDB1 and PDB2 interfaces. At low diode currents, the photodiode reverse bias is kept small to minimize the dark current. At higher input currents, the bias voltage scales linearly with the current to avoid nonlinearity due to photodiode saturation. Both the starting bias level and the scale factor at higher currents are configurable through I²C.

The ADL5309 is specified for operation from −40°C to +105°C ambient temperature and is offered in a small 2.040 mm × 1.640 mm, 20-lead wafer level chip scale package (WLCSP).

APPLICATIONS

Automatic test equipment
Optical power monitoring
Machine automation
Optical modules

Part Models: 3
1ku List Price: Starting From $16.91

Documentation

Data Sheet 1

ADL5309: Dual, 188 dB Range, 10 pA to 25 mA, Logarithmic Converter Data Sheet (Rev.A) 06/24/2024

User Guide 1

UG-2223: Evaluating the ADL5309 Dual, 188 dB Range, 10 pA to 25 mA, Logarithmic Converter (Rev.0) 06/24/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADL5309ACBZ	20-Ball WLCSP (2.04 mm x 1.64 mm x 0.50 mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADL5309ACBZ-R7	20-Ball WLCSP (2.04 mm x 1.64 mm x 0.50 mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADL5309ACBZ-RL	20-Ball WLCSP (2.04 mm x 1.64 mm x 0.50 mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
LDO Linear Regulators 3
LT3042	RECOMMENDED FOR NEW DESIGNS	20V, 200mA, Ultralow Noise, Ultrahigh PSRR RF Linear Regulator
ADP7118	RECOMMENDED FOR NEW DESIGNS	20 V, 200 mA, Low Noise, CMOS LDO Linear Regulator
ADP7112	RECOMMENDED FOR NEW DESIGNS	20 V, 200 mA, Low Noise, CMOS LDO Linear Regulator

Evaluation Kits

Evaluating the ADL5309 Dual, 188 dB Range, 10 pA to 25 mA, Logarithmic Converter

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Features and Benefits

Full featured evaluation board for the ADL5309
Supports external electrical input or on-board photodiode for optical input
On-chip or external photodiode bias
ADC control for V_OUT1, V_OUT2, and digital thermometer

Product Details

The ADL5309-EVALZ evaluation board allows for the evaluation of the ADL5309 logarithmic converter IC.

The ADL5309 is comprised of dual monolithic logarithmic transimpedance amplifiers that are optimized for the measurement of low frequency and wide dynamic range signal power in fiber optic systems. The device produces a highly accurate, temperature compensated output voltage proportional to the logarithm of the ratio between the input current at Pin INP and an internally generated reference current.

The logarithmic slope and intercept are both factory-trimmed to a nominal value of 200 mV/decade and 10 pA, respectively. Both can be adjusted through the I²C interface.

A digital representation of the OUT1 and OUT2 outputs, along with a digital thermometer, is available through the I²C interface. A 14-bit successive approximation register (SAR) analog-to-digital (ADC), controlled through the I²C interface, samples the OUT1 channel output, OUT2 channel output, and the digital thermometer output.

Full specifications on the ADL5309 are available in the ADL5309 data sheet available from Analog Devices, Inc., and must be consulted with this user guide and the ADL5309-EVALZ evaluation board.