ADL5309数据手册ADI中文资料规格书

描述 Description

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

The device produces highly accurate, temperature compensatedoutput voltages that are proportional to the logarithm of the ratiobetween the input current at the INP1 and INP2 pins and theinternally generated reference currents. The logarithmic slope andintercept are both accurately trimmed to a nominal value of 200mV/decade and 10 pA, respectively. The low-impedance OUT1 andOUT2 logarithmic outputs have the capability to drive a wide rangeof analog-to-digital converters (ADCs) and other circuits.

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

Adaptive photodiode biasing is supported through the PDB1 andPDB2 interfaces. At low diode currents, the photodiode reverse biasis kept small to minimize the dark current. At higher input currents,the bias voltage scales linearly with the current to avoid nonlinearitydue to photodiode saturation. Both the starting bias level and thescale factor at higher currents are configurable through I2C.

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

特性 Features

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 (VCC = 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

应用 Application

Automatic test equipment
Optical power monitoring
Machine automation
Optical modules