LMH6502MAX

Overview

The LMH6502MAX is a wideband, low power, linear-in-dB variable gain amplifier manufactured by Texas Instruments. It features a DC-coupled differential input voltage-controlled gain stage followed by a high-speed current feedback operational amplifier capable of driving low impedance loads. The device offers a gain adjustment range exceeding 70dB for frequencies up to 10MHz, with a maximum gain of 40dB. Key electrical parameters include a bandwidth of 130MHz at closed-loop gain, a slew rate of 1800V/µs, and an output referred DC offset voltage under 350mV. It operates on a single supply voltage ranging from 5V to 12V, consuming approximately 300mW of power.

Feature Summary

• Linear-in-dB gain control suitable for automatic gain control (AGC) circuits
• Differential inputs providing common mode rejection for low-level amplification
• High-speed current feedback output stage for large signal handling
• Direct drive capability for low impedance loads

Applications

• Automatic Gain Control (AGC) systems
• RF front-end signal conditioning
• Video signal processing
• Test and measurement equipment

Procurement Notes

Verify the specific suffix 'MAX' indicates the SOIC-14 package variant when ordering. Confirm RoHS compliance status via the manufacturer's datasheet, as 'NOPB' denotes lead-free and rohs compliant construction in related part numbers within the same family. Ensure the design supports the required single-supply or dual-supply configuration based on the ground pin potential requirements specified in the official documentation.

Selection Notes

Select this component for applications requiring wideband performance with precise logarithmic gain control. The differential input architecture is advantageous for noise immunity in long-wire signal transmission. Consider the 130MHz bandwidth and 1800V/µs slew rate for high-frequency signal integrity. Evaluate the 300mW power consumption against thermal constraints in the target enclosure.

Part Context

The LMH6502 belongs to the LMH65xx series of wideband variable gain amplifiers from Texas Instruments. It is functionally similar to the LMH6503 but differs in its linear-in-dB characteristic versus linear voltage gain profile. The MAX suffix typically denotes the plastic small-outline integrated circuit (SOIC) package with a 14-pin configuration, distinguishing it from other package options like TSSOP or MSOP available in the broader product line.

Replacement Considerations

LMH6503MAX/NOPB: Offers linear voltage gain instead of linear-in-dB; verify control curve compatibility. LMH6505MAX/NOPB: Provides wider gain adjustment range; check bandwidth specifications. VCA821IDGSR: Ultra-wideband alternative; ensure interface and gain control voltage ranges match.