Overview
The AD640JP, manufactured by Analog Devices Inc., is a complete monolithic logarithmic amplifier. This device provides up to 50 dB of dynamic range for frequencies from DC to 120 MHz, making it highly versatile for various applications. The AD640JP is designed with high precision analog circuit techniques to ensure stability over wide variations in supply voltage and temperature. It features a fully differential signal path and is available in several temperature ranges, including commercial, industrial, and military grades.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Resistance (Differential) | 500 | 500 | 500 | kΩ | |
| Input Offset Voltage (Differential) | 50 | 200 | 200 | µV | |
| Input Bias Current | 7 | 25 | 25 | µA | |
| Supply Voltage | ±4.5 | ±7.5 | V | ||
| Operating Temperature | 0 | 70 | °C | ||
| Bandwidth (3 dB) | 350 | MHz | |||
| Logarithmic Output Slope (Current, IY) at f < 1 MHz | 0.96 | 1.0 | 1.04 | mA |
Key Features
- Complete, fully calibrated monolithic logarithmic amplifier system.
- Five stages, each with 10 dB gain and 350 MHz bandwidth.
- Direct coupled, fully differential signal path.
- Logarithmic slope, intercept, and AC response stable over full military temperature range.
- Dual polarity current outputs scaled 1 mA/decade.
- Low power operation (typically 220 mW at ±5 V).
- Available in various packages including 20-lead ceramic DIP, leadless chip carriers (LCC), and plastic DIP and PLCC packages.
Applications
- Radar, sonar, ultrasonic, and audio systems.
- Precision instrumentation from DC to 120 MHz.
- Power measurement with absolute calibration.
- High accuracy signal compression.
- Alternative to discrete and hybrid IF strips.
- Replaces several discrete log amp ICs.
Q & A
- What is the dynamic range of the AD640JP?
The AD640JP provides up to 50 dB of dynamic range for frequencies from DC to 120 MHz.
- What are the temperature ranges for the AD640JP?
The AD640JP is available in commercial (0°C to +70°C), industrial (–40°C to +85°C), and military (–55°C to +125°C) temperature ranges.
- What is the input resistance of the AD640JP?
The input resistance of the AD640JP is 500 kΩ (differential).
- What is the typical power consumption of the AD640JP?
The AD640JP typically consumes 220 mW at ±5 V supply voltage.
- What are the common applications of the AD640JP?
The AD640JP is commonly used in radar, sonar, ultrasonic and audio systems, precision instrumentation, power measurement, and high accuracy signal compression.
- What types of packages are available for the AD640JP?
The AD640JP is available in 20-lead ceramic DIP, leadless chip carriers (LCC), and plastic DIP and PLCC packages.
- What is the bandwidth of the AD640JP?
The AD640JP has a bandwidth of 350 MHz for each stage and 145 MHz for all five stages combined.
- How stable is the logarithmic response of the AD640JP?
The logarithmic response of the AD640JP is absolutely calibrated to within ±1 dB for DC or square wave inputs from ±0.75 mV to ±200 mV.
- Does the AD640JP have an integral attenuator?
Yes, the AD640JP includes an integral X10 attenuator providing an alternative input range of ±7.5 mV to ±2 V DC.
- Is the AD640JP RoHS compliant?
Yes, the AD640JP is RoHS compliant.
