5962-9457201MEA

Overview

The AD602 is a dual-channel, low-noise, wideband variable gain amplifier optimized for ultrasound imaging and precision signal processing. It features an X-AMP architecture with a linear-in-dB gain response controlled by a differential voltage interface. The device offers a gain range of -10 dB to +30 dB per channel, with a nominal bandwidth of 35 MHz independent of gain settings. Key specifications include a 1.4 nV/√Hz input noise spectral density, ±0.3 dB absolute gain accuracy, and stable group delay within ±2 ns. It supports signal gating and operates on ±5 V supplies.

Feature Summary

• Proprietary X-AMP circuit topology ensures precise gain definition and low distortion
• Linear decibel gain response proportional to differential control voltage
• Independent signal gating function for each amplifier channel
• MIL-STD-883-compliant and DESC versions available for rugged applications

Applications

• Ultrasound and sonar time-gain controls
• High performance audio and RF automatic gain control systems
• Precision signal measurement equipment

Procurement Notes

Verify the specific grade suffix (J, A, or S) required for the target operating temperature range and environmental compliance. Confirm package availability, as military-grade variants may be restricted to CERDIP packaging. Ensure ordering documentation references the correct DESC part number for defense procurement requirements.

Selection Notes

Select the AD602 over the AD600 when a lower maximum gain improves output signal-to-noise ratio. Verify that the required gain range fits within the -10 dB to +30 dB span. Consider the sequential or parallel cascading modes if an 80 dB total gain range is necessary for the application design.

Part Context

This component belongs to the Analog Devices AD600/AD602 family of dual-channel variable gain amplifiers. The AD602 variant is specifically characterized for a reduced maximum gain compared to the AD600, which optimizes the signal-to-noise ratio at the output while maintaining identical noise density and bandwidth characteristics across the series.

Replacement Considerations

Official substitute part numbers include AD600S and AD602S under DESC SMD 5962-94572 standards. Verify pin compatibility and thermal resistance differences when replacing standard commercial grades with military-grade CERDIP packages.

FAQ

How is the gain calculated for the AD602?

The gain in decibels is calculated using the formula: Gain (dB) = 32 VG + 10, where VG is the differential control voltage in volts.

What is the input impedance of the AD602?

The input resistance is nominally 100 Ω, laser trimmed to ±2%.

Does the bandwidth change with gain settings?

No, the -3 dB bandwidth is nominally 35 MHz and is essentially independent of the gain setting.