The GX7516 fully differential amplifier for intermediate frequency and baseband gain modules replaces the AD8138.

In baseband gain modules, baseband signals typically contain a wealth of information, placing high demands on the amplifier‘s noise performance and gain control accuracy. The GX7516‘s low-noise characteristics and precise gain control capabilities effectively enhance the strength of baseband signals while minimizing noise introduction, ensuring accurate transmission and processing of information.

The GX7516 offers outstanding gain accuracy and stability, enabling effective signal amplification within the intermediate frequency (IF) range while maintaining low distortion and high linearity. This makes it highly suitable for applications such as communication systems, radar equipment, and radio receivers. In IF processing, where signal frequencies are relatively high, the GX7516 can precisely capture and amplify these signals, providing high-quality input for subsequent processing stages.

Compared to general-purpose operational amplifiers, the GX7516 has made significant advancements in differential signal processing. It can function as both a single-ended-to-differential amplifier and a differential-to-differential amplifier, offering the ease of use of a general-purpose operational amplifier while significantly simplifying differential signal amplification and driving. This amplifier features low input noise, a -3dB bandwidth of 300MHz, and provides differential signals with harmonic distortion that is relatively low among existing differential amplifiers. The GX7516 utilizes internal common-mode feedback and external gain feedback to provide good gain and phase matching.

The GX7516 has excellent distortion performance, making it an ideal driver for ADCs in communication systems, capable of driving 10-bit to 16-bit converters at higher frequencies. Its high bandwidth and IP3 characteristics make it suitable for use as a gain module in intermediate frequency (IF) and baseband signal chains. Its outstanding offset and dynamic performance make this device highly suitable for various signal processing and data acquisition applications.  

Key Performance Features:  

• Adjustable common-mode voltage and externally adjustable gain

• Spurious-free dynamic range (SFDR): 91 dBc (5 MHz input); 81 dBc (20 MHz input)

• −3 dB bandwidth: 300 MHz (G = +1)

• 0.01% settling time: 20 ns

• Slew rate: 1000 V/μs

• Fast overdrive recovery: 8 ns

• Low input voltage noise: 3.5 nV/√Hz

• Offset voltage: 0.5 mV (typical)

• Wide supply voltage range: +3 V to ±5 V, low power consumption: 130 mW (5 V)

• 0.1 dB gain flatness up to 40 MHz

• Available in 8-pin SOIC and MSOP packages