AD640JP

Instrumentation, Op Amps, Buffer Amps Overview

The AD640JP is a monolithic logarithmic amplifier IC from Analog Devices, housed in a 20-pin plastic LCC package. It provides a dynamic range of 50 dB with a bandwidth up to 120 MHz. The device features five internally coupled stages, each offering 10 dB gain and 350 MHz bandwidth. It operates on dual polarity power supplies ranging from ±4.5 V to ±7.5 V, consuming typically 220 mW at ±5 V. The input impedance is approximately 500 kΩ in parallel with 2 pF.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Complete fully calibrated monolithic system with five direct-coupled differential signal path stages
• Logarithmic slope, intercept, and AC response remain stable across the full military temperature range
• Provides dual polarity current outputs scaled at 1 mA per decade with multiple voltage slope options
• Low power operation capability suitable for demanding analog signal processing environments

Instrumentation, Op Amps, Buffer Amps Applications

• Radar systems
• Sonar systems
• Ultrasonic testing equipment
• Precision instrumentation operating from DC to 120 MHz

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix JP indicates the plastic LCC-20 package configuration and lead-free status compliance relative to your assembly requirements. Confirm that the military temperature rating aligns with your operational environment specifications. Ensure external low-pass filtering is included in the design, as the AD640 does not integrate an on-chip filter. Validate pinout compatibility with existing PCB footprints before finalizing procurement orders.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a wide dynamic range and high bandwidth are required in a single chip solution. It is suitable for applications needing precise logarithmic conversion without external calibration components. Consider cascading two units if a dynamic range exceeding 50 dB is necessary, noting the associated bandwidth reduction. Verify that the plastic package thermal characteristics meet the system's heat dissipation needs.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD640 series represents a family of complete logarithmic amplifiers designed for high-performance signal processing. The AD640JP specifically denotes the commercial or industrial grade variant within the broader AD640 lineup, which also includes military-grade versions like the AD640T. This series is engineered to replace discrete logarithmic amplifier solutions, offering improved accuracy and reduced board space through monolithic integration.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.