LMH6502MA

Overview

The LMH6502MA is a wideband, low power, linear-in-dB variable gain amplifier manufactured by National Semiconductor. It features a DC coupled differential input voltage controlled gain stage followed by a high-speed current feedback operational amplifier capable of directly driving low impedance loads. The device provides a gain adjustment range exceeding 70dB for frequencies up to 10MHz. Power consumption is specified at 300mW with a bandwidth of 130MHz. Output referred DC offset voltage remains below 350mV across the entire gain control voltage range. Device-to-device gain matching is within ±0.6dB at maximum gain.

Feature Summary

• Linear-in-dB gain control suitable for automatic gain control circuits
• Differential inputs providing common mode rejection for low level amplification
• High slew rate and heavy load drive capability via current feedback output stage

Applications

• Automatic Gain Control (AGC) circuits
• Low level signal amplification requiring common mode rejection
• Applications involving signal transmission over relatively long wires

Procurement Notes

Verify the manufacturer designation carefully as National Semiconductor is now part of Texas Instruments. Confirm the specific suffix 'MA' against official datasheets to ensure correct package type and temperature rating. Cross-reference ordering information with current TI documentation to avoid discrepancies in legacy part identification.

Selection Notes

Select this component when a wideband variable gain amplifier with linear-in-dB characteristics is required. Ensure the application can accommodate the 300mW power consumption. Verify that the supply voltage and ground pin configuration align with single or dual supply requirements, particularly regarding the virtual half-supply connection for single supply operation.

Part Context

This component belongs to the LMH series of wideband amplifiers designed for high-speed signal processing applications. It integrates a voltage-controlled gain stage with a current feedback op amp to provide flexible gain adjustment while maintaining high frequency performance. The series is optimized for applications requiring precise gain control over a wide dynamic range.

Replacement Considerations

Consult Texas Instruments documentation for direct replacements or pin-compatible alternatives within the LMH series. Verify electrical parameters such as bandwidth, power consumption, and gain linearity before substituting.