LMH2832IRHAR

Overview

The LMH2832IRHAR is a high-linearity, fully-differential, dual-channel digital variable-gain amplifier (DVGA) manufactured by Texas Instruments. Designed for high-speed signal chain and data-acquisition systems, it operates with a bandwidth of 1.1 GHz. The device features a 5 V supply voltage and draws 108 mA of supply current. Key electrical specifications include a gain of 30 dB, a noise figure of 6.5 dB, a P1dB compression point of 16.5 dBm, and an OIP3 of 31.5 dBm. It is housed in a 40-VQFN (6x6 mm) package.

Feature Summary

• Dual-channel architecture providing two independent variable-gain amplifiers within a single integrated circuit.
• Digital control interface allows precise gain adjustment without external analog components.
• Fully differential signal path ensures high common-mode rejection and improved noise performance.
• High linearity characteristics support wide dynamic range applications in demanding signal chains.

Applications

• High-speed data acquisition systems
• Wireless infrastructure base stations
• Test and measurement equipment

Procurement Notes

Verify the specific suffix 'AR' indicates the tape-and-reel packaging configuration when ordering. Confirm that the 40-VQFN footprint matches the design layout, as the exposed pad requires thermal management considerations. Ensure the digital control logic levels are compatible with the host microcontroller or FPGA interface to prevent communication errors during gain programming.

Selection Notes

Select this component when a fully differential solution is required to minimize noise and distortion in high-frequency applications. The digital gain control offers flexibility compared to analog VGAs, simplifying system calibration. Consider the 1.1 GHz bandwidth limit when evaluating higher frequency requirements. The dual-channel design reduces board space compared to using two separate single-channel amplifiers.

Part Context

This part belongs to the LMH2832 series from Texas Instruments, which focuses on high-performance RF and IF signal processing. The series is designed to bridge the gap between analog front-ends and high-speed ADCs. The LMH2832 specifically targets applications requiring precise gain control and high linearity in wireless communications and instrumentation environments.

Replacement Considerations

The LMH2832IRHAT is a pin-compatible alternative available in cut-tape or Digi-Reel packaging instead of the standard reel format of the IRHAR variant. Verify that the functional specifications remain identical before substitution to ensure system performance consistency.

FAQ

What type of control interface does the LMH2832 use for gain adjustment?

The LMH2832 utilizes a digital control interface to adjust the gain of its dual channels, eliminating the need for external analog potentiometers or DACs.

Is the LMH2832 suitable for single-ended applications?

No, the LMH2832 is a fully-differential amplifier. It is designed to process differential signals and is not intended for direct single-ended operation without appropriate conversion circuitry.