直流耦合解调120 MHz的对数放大器 DC-Coupled Demodulating 120 MHz Logarithmic Amplifier
PRODUCT DESCRIPTION
The AD640 is a complete monolithic logarithmic amplifier. A single AD640 provides up to 50 dB of dynamic range for frequencies from dc to 120 MHz. Two AD640s in cascade can provide up to 95 dB of dynamic range at reduced bandwidth. The AD640 uses a successive detection scheme to provide an output current proportional to the logarithm of the input voltage. It is laser calibrated to close tolerances and maintains high accuracy over the full military temperature range using supply voltages from ±4.5 V to ±7.5 V.
FEATURES
Complete, Fully Calibrated Monolithic System
Five Stages, Each Having 10 dB Gain, 350 MHz BW
Direct Coupled Fully Differential Signal Path
Logarithmic Slope, Intercept and AC Response are Stable Over Full Military Temperature Range
Dual Polarity Current Outputs Scaled 1 mA/Decade
Voltage Slope Options 1 V/Decade, 100 mV/dB, etc.
Low Power Operation Typically 220 mW at 65 V
Low Cost Plastic Packages Also Available
APPLICATIONS
Radar, Sonar, Ultrasonic and Audio Systems
Precision Instrumentation from DC to 120 MHz
Power Measurement with Absolute Calibration
Wide Range High Accuracy Signal Compression
Alternative to Discrete and Hybrid IF Strips
Replaces Several Discrete Log Amp ICs