Overview
The AD640JPZ-REEL7 is a variant of the AD640, a complete monolithic logarithmic amplifier produced by Analog Devices Inc. This device is designed to provide a wide dynamic range and high accuracy in signal compression and power measurement. The AD640 offers up to 50 dB of dynamic range for frequencies from DC to 120 MHz, making it suitable for various high-frequency applications. The logarithmic response is absolutely calibrated to within ±1 dB for DC or square wave inputs from ±0.75 mV to ±200 mV, with an intercept (logarithmic offset) at 1 mV DC. The device is available in different temperature ranges, including commercial, industrial, and military grades, ensuring versatility in various environmental conditions.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| SIGNAL INPUTS (Pins 1, 20) | Input Capacitance Either Pin to COM | 2 | 2 | 2 | pF |
| Noise Spectral Density | 1 kHz to 10 MHz | 2 | 2 | 2 | nV/√Hz |
| Tangential Sensitivity | BW = 100 MHz | -72 | -72 | -72 | dBm |
| 3 dB BANDWIDTH | Each Stage | 350 | 350 | 350 | MHz |
| LOGARITHMIC OUTPUTS | Slope Current, IY f<= 1 MHz | 0.96 | 1.0 | 1.04 | mA |
| Input Voltage (Pin 1 or Pin 20 to COM) | -3 V | +300 mV | V | ||
| Attenuator Input Voltage (Pin 5 to Pin 3/4) | ±4 V | V | |||
| Ambient Temperature Range, Rated Performance | Industrial, AD640B | -40°C | +85°C | °C | |
| Ambient Temperature Range, Rated Performance | Military, AD640T | -55°C | +125°C | °C |
Key Features
- Complete, fully calibrated monolithic system with five stages, each having 10 dB gain and 350 MHz bandwidth.
- Direct coupled fully differential signal path with logarithmic slope, intercept, and AC response stable over the full military temperature range.
- Dual polarity current outputs scaled 1 mA/decade with voltage slope options (1 V/decade, 100 mV/dB, etc.).
- Low power operation, typically 220 mW at ±5 V.
- Integral X10 attenuator providing an alternative input range of ±7.5 mV to ±2 V DC.
- Available in various packages including 20-lead side-brazed ceramic DIPs, 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.
- Wide range high accuracy signal compression.
- Alternative to discrete and hybrid IF strips, replacing several discrete log amp ICs.
Q & A
- What is the dynamic range of the AD640? The AD640 provides up to 50 dB of dynamic range for frequencies from DC to 120 MHz.
- What are the temperature ranges for the AD640 variants? The AD640J is specified for the commercial temperature range of 0°C to +70°C, the AD640B for the industrial range of –40°C to +85°C, and the AD640T for the military range of –55°C to +125°C.
- What is the typical power consumption of the AD640? The AD640 typically operates at 220 mW at ±5 V.
- What are the input voltage ranges for the AD640? The input voltage ranges are ±0.75 mV to ±200 mV and an alternative range of ±7.5 mV to ±2 V DC using the integral X10 attenuator.
- What are the key applications of the AD640? Key applications include radar, sonar, ultrasonic and audio systems, precision instrumentation, and power measurement.
- What is the 3 dB bandwidth of each stage in the AD640? Each stage has a 3 dB bandwidth of 350 MHz.
- What is the noise spectral density of the AD640? The noise spectral density is 2 nV/√Hz from 1 kHz to 10 MHz.
- What are the package options for the AD640? The AD640 is available in 20-lead side-brazed ceramic DIPs, leadless chip carriers (LCC), and plastic DIP and PLCC packages.
- Is the AD640 suitable for military applications? Yes, the AD640T variant is specified for the military temperature range and is available processed to MIL-STD-883B.
- What is the logarithmic slope stability of the AD640? The logarithmic slope, intercept, and AC response are stable over the full military temperature range.
