LMH6521SQ/NOPB

Overview

The LMH6521SQ/NOPB is a high-performance dual digital variable-gain amplifier (DVGA) manufactured by Texas Instruments. It integrates two independent VGA channels within a single package, designed for applications requiring precise gain control. The device operates with a supply voltage range of 4.5 V to 5.25 V and draws approximately 180 mA per channel. Key electrical specifications include a slew rate of 5 kV/µs, an input-referred noise density of 1.1 nV/√Hz, and a maximum voltage gain of 22 dB. It features a common-mode rejection ratio (CMRR) of 60 dB and a power supply rejection ratio (PSRR) of 60 dB. The component is housed in a WQFN-32 package and supports operation temperatures from -40°C to +85°C.

Feature Summary

• Dual-channel architecture providing independent signal processing paths within a compact footprint
• Digital interface enables precise and programmable gain adjustment without external analog controls
• Low noise performance suitable for sensitive intermediate frequency and baseband signal chains

Applications

• Intermediate frequency (IF) amplification in multi-standard communication systems
• Baseband signal conditioning for video and data transmission links
• Automatic gain control stages in receiver front-ends

Procurement Notes

Verify the specific suffix 'SQ' against the manufacturer's latest datasheet to confirm temperature grade and packaging details. Ensure compatibility with the required digital control interface logic levels. Check for moisture sensitivity classification prior to surface mount assembly. Confirm that the WQFN-32 thermal pad requirements are met by the printed circuit board design to ensure reliable operation under specified load conditions.

Selection Notes

Select this component when dual-channel gain matching and low noise are critical requirements. Compare the 22 dB gain range and 1.1 nV/√Hz noise density against alternative DVGA solutions to ensure they meet system dynamic range specifications. Evaluate the digital control interface complexity against available microcontroller or FPGA resources. Consider the WQFN-32 package thermal dissipation capabilities relative to the total power consumption of both channels during continuous operation.

Part Context

The LMH6521 belongs to the LMH65xx family of digital variable-gain amplifiers from Texas Instruments. This series is engineered for broadband RF and IF applications where stable gain characteristics across frequency are essential. The dual-channel configuration allows for balanced differential signaling or independent processing of two distinct signals, reducing board space compared to using single-channel counterparts.

FAQ

What is the maximum voltage gain provided by each channel?

Each channel provides a maximum voltage gain of 22 dB.

Does the device support differential input and output configurations?

Yes, the LMH6521 is designed as a fully differential amplifier, supporting both differential input and output connections.