Analog Devices ADL5308
Fast Response 188dB Range Logarithmic Converter
FEATURES
► Fast transient response (IPD stepped from 220 µA to 10 nA) ► Rise/fall time: <2.4 µs ► 2 dB Electrical (1 dB optical) settling time: <3.5 µs ► Flat Frequency Response/No Undershoot ► Bandwidth: 970 kHz at IINP = 10 nA ► Accurately trimmed logarithmic response ► Logarithmic slope: 200 mV/dec ► Logarithmic conformance error: ±0.2 dB at 25°C (IINP from 10 nA to 1 mA) ► Ratio input for direct optical gain measurements ► Comparator with adjustable hysteresis and latch enable ► Analog and digital comparator reference ► I2C adjustable ► Adaptive photodiode bias ► Comparator reference level ► Minimal external components are required ► 34 dB PSRR at 20 kHz and IINP = 10 nA ► 2 mm × 3 mm, 14-terminal LGA packageAPPLICATIONS
► Optical power monitoring ► Erbium-doped fiber amplifiers (EDFA) FUNCTIONAL BLOCK DIAGRAMGENERAL DESCRIPTION
The ADL5308 is a logarithmic transimpedance amplifier optimized for wide dynamic range signal level monitoring in fiber optic systems. It produces an acc...