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Description

The AD8304 is a monolithic logarithmic detector optimized for the measurement of low frequency signal power in fiber optic systems. It uses an advanced translinear technique to provide an exceptionally large dynamic range in a versatile and easily used form. Its wide measurement range and accuracy are achieved using proprietary design techniques and precise laser trimming. In most applications only a single positive supply, VP, of 5 V will be required, but 3.0 V to 5.5 V can be used, and certain applications benefit from the added use of a negative supply, VN. When using low supply voltages, the log slope is readily altered to fit the available span. The low quiescent current and chip disable features facilitate use in battery-operated applications.

Features

1. Optimized for Fiber Optic Photodiode Interfacing
2. Eight Full Decades of Range
3. Law Conformance 0.1 dB from 1 nA to 1 mA
4. Single-Supply Operation (3.0 V– 5.5 V)
5. Complete and Temperature Stable
6. Accurate Laser-Trimmed Scaling:
7. Logarithmic Slope of 10 mV/dB (at VLOG Pin)
8. Basic Logarithmic Intercept at 100 pA
9. Easy Adjustment of Slope and Intercept
10. Output Bandwidth of 10 MHz, 15 V/s Slew Rate
11. Low Power: ~4.5 mA Quiescent Current (Enabled)

Applications : 

1. High Accuracy Optical Power Measurement
2. Wide Range Baseband Log Compression
3. Versatile Detector for APC Loops