TI LMH6521SQE/NOPB

The LMH6521 contains two high-performance digitally controlled variable gain amplifiers (DVGAs). Both channels of the LMH6521 have independent digitally controlled attenuators, followed by high-linearity differential output amplifiers. Each block is optimized for low distortion and maximum system design flexibility. Each channel has a high-speed shutdown mode. The internal digitally controlled attenuator provides precise 0.5dB gain steps over a 31.5dB range. The device offers both serial and parallel programming options. Serial mode programming uses the SPI interface. It also provides a pulse mode, where simple rising or falling commands can change the gain by one step at a time. The output amplifier has a differential output, allowing a 10VPPD signal swing on a single 5V supply. The low-impedance output provides maximum flexibility when driving filters or analog-to-digital converters.

• OIP3 of 48.5dBm at 200MHz
• Maximum voltage gain of 26dB
• Gain range: 31.5dB in 0.5dB steps
• Channel gain matching of ±0.04dB
• Noise figure at maximum gain: 7.3dB
• –3dB bandwidth of 1200MHz
• Low power consumption
• Independent channel shutdown
• Three gain control modes: parallel interface, serial interface (SPI), pulse mode interface
• Temperature range: –40°C to +85°C
• Thermally enhanced 32-pin WQFN package

• Cellular base stations
• Wideband and narrowband IF sampling receivers
• Wideband direct conversion
• Digital predistortion
• ADC drivers