Datasheet AD8305 (Analog Devices) - 10

AD8305 Data Sheet 10 4000 8 3500 6 3000 c) 4 MEAN + 3σ V/de 2500 2 m IFT ( 0 UNT 2000 R CO y D –2 1500 V MEAN – 3σ Δ –4 1000 –6 –8 500 –10 0 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
030 027
0.4 0.6 0.8 1.0 1.2 1.4 1.6 TEMPERATURE (°C) INTERCEPT (nA)
03053- 03053- Figure 27. Slope Drift vs. Temperature (3σ to Either Side of Mean of Figure 30. Distribution of Logarithmic Intercept (Nominally 1 nA when 200 mV/decade) RREF = 200 kΩ ± 0.1%) Sample >22,000
350 7000 250 6000 MEAN + 3σ 150 5000 ) pA 50 4000 IFT ( R UNT D –50 CO 3000 Iz Δ –150 2000 MEAN – 3σ –250 1000 –350 0 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
028
2.44 2.46 2.48 2.50 2.52 2.54 2.56
031
85 TEMPERATURE (°C) V
03053-
REF (V)
03053- Figure 28. Intercept Drift vs. Temperature (3σ to Either Side of Mean of 1 nA) Figure 31. Distribution of VREF (RL = 100 kΩ) Sample >22,000
6000 6000 5000 5000 4000 4000 UNT 3000 UNT 3000 CO CO 2000 2000 1000 1000 0 0 190 195 200 205 210
029
–0.015 –0.010 –0.005 0 0.005 0.010 0.015
032
SLOPE (mV/dec)
03053-
VINPT – VSUM VOLTAGE (V)
03053- Figure 29. Distribution of Logarithmic Slope (Nominally Figure 32. Distribution of Offset Voltage (VINPT − VSUM) Sample >22,000 200 mV/decade) Sample >22,000 Rev. C | Page 10 of 24 Document Outline Features Applications Functional Block Diagram General Description Table of Contents Revision History Specifications Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics General Structure Theory Managing Intercept and Slope Response Time and Noise Considerations Power Supply Sequencing Applications Information Calibration Using a Negative Supply Log-Ratio Applications Reversing The Input Polarity Characterization Methods Evaluation Board Outline Dimensions Ordering Guide