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LOG114 Single-Supply, High-Speed, Precision Logarithmic Amplifier
SBOS301B
May 2004 – March 2025
LOG114
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LOG114 Single-Supply, High-Speed, Precision Logarithmic Amplifier
1
1
Features
2
Applications
3
Description
4
Pin Configuration
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics (±5V)
5.6
Electrical Characteristics (5V)
5.7
Typical Characteristics: VS = ±5V
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Logarithmic and Difference Amplifier
6.3.2
COM Voltage Range
6.3.3
VCM IN
6.3.4
Auxiliary Operational Amplifier
6.4
Device Functional Modes
7
Application and Implementation
7.1
Applications Information
7.1.1
Transfer Function
7.1.2
Input Current Range
7.1.3
Setting the Reference Current
7.1.4
Negative Input Currents
7.1.5
Voltage Inputs
7.1.6
High-Current Linearity Correction
7.1.7
Error Sources
7.1.7.1
Accuracy
7.1.7.2
Total Error
7.1.7.3
Errors RTO and RTI
7.1.7.4
Log Conformity
7.1.7.5
Individual Error Components
7.2
Typical Applications
7.2.1
Design Example for Dual-Supply Configuration
7.2.2
Design Example for Single-Supply Configuration
7.2.3
Advantages of Dual−Supply Operation
7.2.4
Log Ratio
7.2.5
Data Compression
7.2.6
3.3V Operation
7.2.7
Erbium-Doped Fiber Optic Amplifier (EDFA)
7.3
Power Supply Recommendations
7.4
Layout
7.4.1
Layout Guidelines
7.4.2
Layout Example
8
Device and Documentation Support
8.1
Documentation Support
8.1.1
Related Documentation
8.1.2
PSpice® for TI
8.1.3
TINA-TI™ (Free Software Download)
8.2
Receiving Notification of Documentation Updates
8.3
Support Resources
8.4
Trademarks
8.5
Electrostatic Discharge Caution
8.6
Glossary
9
Revision History
10
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
RGV|16
MPQF121F
Thermal pad, mechanical data (Package|Pins)
RGV|16
QFND006L
Orderable Information
sbos301b_oa
sbos301b_pm
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LOG114 Single-Supply, High-Speed, Precision Logarithmic Amplifier