Overview
The AD640JP-REEL7 is a complete monolithic logarithmic amplifier produced by Analog Devices Inc. This device is designed to provide a wide dynamic range and high accuracy over a broad frequency spectrum. It is part of the AD640 series, which includes various temperature range and package options. The AD640JP-REEL7 specifically operates within the commercial temperature range of 0°C to +70°C and is packaged in a 20-lead PLCC (Plastic Leaded Chip Carrier).
The AD640JP-REEL7 uses a successive detection scheme to generate an output current proportional to the logarithm of the input voltage. It is laser calibrated to maintain high accuracy over the full temperature range and can operate with supply voltages from ±4.5 V to ±7.5 V.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage | ±4.5 V | ±7.5 V | V | |
| Operating Temperature | 0°C | 70°C | °C | |
| Input Capacitance | 2 pF | pF | ||
| Noise Spectral Density (1 kHz to 10 MHz) | 2 nV/√Hz | nV/√Hz | ||
| -3 dB Bandwidth (Each Stage) | 350 MHz | MHz | ||
| -3 dB Bandwidth (All Five Stages) | 145 MHz | MHz | ||
| Logarithmic Output Slope Current (f < 1 MHz) | 0.96 mA/Decade | 1.0 mA/Decade | 1.04 mA/Decade | mA/Decade |
| Supply Current | 35 mA | mA | ||
| Output Current per Channel | 2.3 mA | mA | ||
| Input Bias Current | 7 µA | µA |
Key Features
- Complete Monolithic System: The AD640JP-REEL7 is a fully integrated logarithmic amplifier with five cascaded dc-coupled amplifier/limiter stages, each having a small signal voltage gain of 10 dB and a –3 dB bandwidth of 350 MHz.
- High Dynamic Range: 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.
- Logarithmic Response: The output current is proportional to the logarithm of the input voltage, with a logarithmic slope of 1 mA per decade (50 µA per dB).
- Stable Over Temperature Range: Maintains high accuracy over the full military temperature range for certain models, and the commercial temperature range of 0°C to +70°C for the AD640JP-REEL7.
- Dual Polarity Current Outputs: Scaled 1 mA/Decade with voltage slope options available.
- Low Power Operation: Typically operates at 220 mW with ±5 V supply.
- Integral X10 Attenuator: Provides an alternative input range of ±7.5 mV to ±2 V dc.
Applications
- Radar, Sonar, and Ultrasonic Systems: Ideal for signal compression and dynamic range extension in these applications.
- Precision Instrumentation: Used in precision instrumentation from DC to 120 MHz for accurate signal measurement.
- Power Measurement: Provides absolute calibration for power measurement applications.
- Audio Systems: Suitable for audio signal processing due to its wide dynamic range and high accuracy.
- Alternative to Discrete and Hybrid IF Strips: Replaces several discrete log amp ICs, simplifying circuit design and reducing component count.
Q & A
- What is the AD640JP-REEL7?
The AD640JP-REEL7 is a monolithic logarithmic amplifier produced by Analog Devices Inc., designed for high dynamic range and accuracy over a broad frequency spectrum.
- What is the operating temperature range of the AD640JP-REEL7?
The AD640JP-REEL7 operates within the commercial temperature range of 0°C to +70°C.
- What is the supply voltage range for the AD640JP-REEL7?
The supply voltage range is from ±4.5 V to ±7.5 V.
- What is the dynamic range of the AD640JP-REEL7?
The AD640JP-REEL7 provides up to 50 dB of dynamic range for frequencies from dc to 120 MHz. Two units in cascade can provide up to 95 dB of dynamic range.
- What is the bandwidth of each stage in the AD640JP-REEL7?
Each stage has a –3 dB bandwidth of 350 MHz.
- How is the logarithmic output scaled?
The logarithmic output is scaled at 1 mA per decade (50 µA per dB).
- What are the typical power consumption and supply current of the AD640JP-REEL7?
The typical power consumption is 220 mW at ±5 V, and the supply current is 35 mA.
- What are some common applications of the AD640JP-REEL7?
Common applications include radar, sonar, ultrasonic systems, precision instrumentation, power measurement, and audio systems.
- What package options are available for the AD640JP-REEL7?
The AD640JP-REEL7 is available in a 20-lead PLCC (Plastic Leaded Chip Carrier) package.
- Is the AD640JP-REEL7 RoHS compliant?
No, the AD640JP-REEL7 is not RoHS compliant as it contains lead.
