Datasheet Analog Devices AD8305ACPZ-RL7 — Datenblatt

100 dB Range (10 nA to 1 mA)
Logarithmic Converter
AD8305 Data Sheet FUNCTIONAL BLOCK DIAGRAM Optimized for fiber optic photodiode interfacing
Measures current over 5 decades
Law conformance 0.1 dB from 10 nA to 1 mA
Single-or dual-supply operation (3 V to 12 V total)
Full log-ratio capabilities
Nominal slope of 10 mV/dB (200 mV/decade)
Nominal intercept of 1 nA (set by external resistor)
Optional adjustment of slope and intercept
Complete and temperature stable
Rapid response time for a given current level
Miniature 16-lead chip scale package
(LFCSP 3 mm × 3 mm)
Low power: ~5 mA quiescent current VP 0.20 log10 VPOS
VRDZ VOUT
80kΩ VREF
200kΩ 2.5V 20kΩ
0.5V BIAS
GENERATOR COMM
SCAL IREF VBE2 VBIAS Q2
Q1
IPD – …