Datasheet ADL5304 (Analog Devices) - 3

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Data Sheet ADL5304 SPECIFICATIONS
VPOS = 5 V, VNEG = 0 V, TA = 25°C; IDEN = IREF; VSM1 to VSM4, 1P5V, DCBI, and INPS tied together; SCL1 = VLOG; SCL2 = INMS; SCL3 = open; scale = 200 mV/dec; VLOG output load RL > 2 kΩ, unless otherwise noted. Upper case indicates a pin name (for example, VLOG) and subscripted indicates signal name (for example, VLOG).
Table 1. Parameter Test Conditions/Comments Min Typ Max Unit
INPUT INTERFACES INUM, IDEN, VSMx pins Specified Current Range Flows toward each input pin (INUM and IDEN), 1 × 10−12 1 × 10−3 A −5 V ≤ VNEG ≤ −2 V VNEG = 0 V 1 × 10−12 3 × 10−3 A Temperature Drift (INUM and IDEN) −40°C < TA < +85°C 0.01 mV/°C Input Guard Offset Voltage VINUM − VVSUM −2 ±0.6 +2 mV LOGARITHMIC OUTPUT VLOG pin, referenced to ACOM; input applied to INUM1 Logarithmic Slope, VY 25°C 195 200 205 mV/dec −40°C < TA < +85°C −2 +3 mV/dec Logarithmic Intercept, I 2 Z Extrapolated input current at VLOG = 0 V 3.162 fA Logarithmic Offset Difference between VLOG and VSUM with INUM = IDEN −8 +5 mV −40°C < TA < +85°C 25 µV/°C Logarithmic Law Conformance Error Maximum deviation from best fit over −0.7 ±0.2 +0.7 dB 1 nA to 100 µA range VLOG OUTPUT INPS, INMS, VLOG, SCL1, SCL2, SCL3 pins Output Buffer Offset Voltage −3 +0.1 +3 mV Output Buffer Bias Current Flowing out of the INPS pin −1.3 µA Incremental Input Resistance Pin INPS 12 MΩ Output Range RL open VNEG + 0.2 VPOS − 0.2 V Output Noise Spectral Density3 INUM > 1 nA <6 µV/√Hz Small Signal Bandwidth INUM = 1 nA 25 kHz INUM = 10 nA 350 kHz INUM = 100 nA 1.2 MHz INUM > 1 µA 4 MHz Falling Edge Settling Times4 INUM = 100 nA to 10 nA 10 µs INUM = 1 µA to 100 nA 2.2 µs INUM = 10 µA to 1 µA 0.5 µs INUM > 10 µA <0.5 µs Nominal Voltage Swing For input current range of 1 pA to 10 mA 0.5 2.5 V Output Impedance Frequency < 1 MHz <2 Ω REFERENCE OUTPUTS 1P5V, 2VLT, IREF pins 1P5V (Referenced to ACOM) 25°C 1.495 1.500 1.505 V −40°C < TA < +85°C 30 µV/°C Output Current −10 +5 mA 2VLT (Referenced to ACOM) 25°C 1.995 2.000 2.005 V −40°C < TA < +85°C 31 µV/°C Output Current Sourcing only 0 20 mA IREF5 25°C 100 nA −40°C < TA < +85°C −70 pA/°C PHOTODIODE BIAS IMON pin; IMON = 1.1 × INUM Midrange Value At a photodiode current = INUM = 100 nA 110 nA Maximum Value At INUM = 1 mA (RS ≤ 100 Ω), RMNTR = 10 × RS 10.5 11 11.5 mA (RS = photodiode series resistance) IMON Compliance 0 3.0 V Rev. A | Page 3 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION SIMPLIFIED BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS TERMINOLOGY THEORY OF OPERATION BASIC CONCEPTS OPTICAL MEASUREMENTS Decibel Scaling CIRCUIT DESCRIPTION Bandwidth vs. Current Noise vs. Current Filtering to Improve Noise and Dynamic Behavior Photodiode Bias Reference Outputs Buffer Amplifier Setting the Log Slope and Intercept Slope Inversion Log Ratio Operation APPLICATIONS INFORMATION USING THE ADL5304 Using the Adaptive Bias Summing Node Voltage Leakage VLOG Output Dynamic Response USING A NEGATIVE SUPPLY EVALUATION BOARD SCHEMATIC AND SILKSCREENS OUTLINE DIMENSIONS ORDERING GUIDE