AD605AN

Overview

The AD605AN is a dual-channel, low-noise, single-supply variable gain amplifier (VGA) from Analog Devices. It features linear-in-dB gain control with a total range of 48 dB per channel, selectable between -14 dB to +34 dB or 0 dB to +48 dB via external feedback resistors. The device operates on a single 5 V supply, drawing 18 mA per channel, and offers a -3 dB bandwidth of 40 MHz. Input noise is specified at 1.8 nV/√Hz. It utilizes a differential input architecture and provides independent output common-mode setting for flexible signal conditioning in high-performance applications.

Feature Summary

• Dual independent channels with linear-in-dB gain response
• Low noise performance optimized for precision signal processing
• Single-ended, unipolar gain control interface with power-down capability
• Independent output common-mode voltage setting

Applications

• Ultrasonic and sonar time gain control systems
• High-performance automatic gain control (AGC) circuits
• Precision signal measurement instrumentation

Procurement Notes

Verify the specific suffix 'AN' corresponds to the PDIP-16 through-hole package variant when sourcing. Confirm that the required gain range configuration matches the available resistor options defined in the datasheet. Ensure the operating environment stays within the specified temperature range of -40°C to +85°C. Check for RoHS compliance status if environmental regulations apply to the project. Validate pin compatibility against existing PCB layouts before procurement.

Selection Notes

Select this component when dual-channel VGA functionality with linear-in-dB characteristics is required. It is suitable for designs needing a 40 MHz bandwidth and low input noise density. Consider the single-supply operation for simplified power management. Evaluate the need for independent output common-mode control to match downstream circuit requirements. Assess whether the programmable gain ratio meets the system's dynamic range needs.

Part Context

The AD605 belongs to Analog Devices' family of broadband variable gain amplifiers. The AD605AN specifically denotes the leaded PDIP-16 package version. This series is designed for applications requiring accurate gain control over a wide dynamic range. The device integrates a DSX-AMP architecture combining a variable attenuator with a fixed-gain amplifier stage.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source documentation. Verify pinout and electrical specifications carefully if considering alternative VGA devices from other manufacturers.