Manufacturer Part Number

AD640JP

Description

Logarithmic amplifier IC with one channel. Designed by Analog Devices for high-frequency and wide dynamic range applications. The package is a 20-lead PLCC (Plastic Leaded Chip Carrier), measuring 9x9 mm. This IC is obsolete but still available in some inventories. Primarily used for signal processing where precision logarithmic conversion is needed.

Specifications

Amplifier Type: Logarithmic

Number of Circuits: 1

Bandwidth (-3dB): 350 MHz

Input Bias Current: 7 μA

Input Offset Voltage: 50 μV

Output Current per Channel: 2.3 mA

Supply Voltage Range: 9 V to 15 V

Supply Current: 35 mA

Operating Temp Range: 0°C to 70°C

Package Type: Surface Mount, 20-LCC (J-Lead), 20-PLCC (9x9 mm)

MSL: 1 (Unlimited moisture sensitivity)

ECCN: EAR99

HTSUS: 8542.33.0001

Device Structure

Integrated circuit, single-channel logarithmic amplifier in a surface mount PLCC enclosure (20 pins). J-lead format, compatible with automated pick-and-place assembly processes. Features robust packaging for industrial environments.

Performance Characteristics

High-precision logarithmic response for signal amplitude measurements. Wide bandwidth up to 350 MHz allows use in RF and video frequency systems. Very low input offset voltage (50 μV) and moderate input bias current (7 μA) ensure accurate performance. Stable across operating temperature range (0°C to 70°C). Current efficient for outputs (2.3 mA per channel).

Application Environments

Best for high-frequency measuring and monitoring systems, such as RF signal detection, audio level monitoring, instrumentation, and medical devices requiring wide dynamic range signal processing. Used in environments needing precise linear-to-log signal conversion.

Selection Guidelines

Ensure supply voltage is within 9 V to 15 V. Assess system dynamic range and frequency requirements; if your application operates under 350 MHz, this chip fits. Confirm that you need single-channel, logarithmic amplification and surface mount installation. If replacement stocks are limited due to obsolete status, consider alternatives during design.

Usage Considerations

Avoid exceeding recommended voltage and temperature ratings. Pay special attention to PCB layout for high-frequency signals to minimize noise and ensure stable operation. Since device is obsolete, check inventory availability and consider footprint compatibility if designing for new hardware.

Potential Equivalent/Replacement Models

AD640BPZ is a suggested substitute for AD640JP. Other potential equivalents may exist; however, exact drop-in replacements should be confirmed based on the specific application and device requirements. If you cannot find suitable alternatives or need guidance, contact Ariat-Tech sales team for up-to-date information and sourcing options.

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