Features and Benefits
- Full feature evaluation board for the ADMV4420
- On-board SDP-S connector for SPI control
- 5 V operation
- ACE software interface for SPI control
The ADMV4420 is a highly integrated, double balanced, active mixer with integrated fractional-N synthesizer, ideally suited for next generation K band satellite communications.
The radio frequency (RF) front end consists of an integrated RF balun and a low noise amplifier (LNA) for optimum 7 dB, single sideband noise figure while minimizing external components. Additionally, the high dynamic range intermediate frequency (IF) output amplifier provides a nominal conversion gain of 36 dB.
An integrated, low phase noise, fractional-N phase-locked loop (PLL) with a multicore voltage controlled oscillator (VCO) and an internal ×2 multiplier generates the necessary on-chip local oscillator (LO) signal for the double balanced mixer, eliminating the need for external frequency synthesis. The multicore VCO uses an internal autocalibration routine that allows the PLL to select the necessary settings and lock in approximately 400 μs.
The reference input to the PLL employs a differentially excited 50 MHz crystal oscillator on the evaluation board. Alternatively, the reference input can be driven by an external single-ended reference source. The phase frequency detector (PFD) comparison frequency of the PLL operates up to 50 MHz.
The ADMV4420 is fabricated on a silicon germanium (SiGe), bipolar complementary metal-oxide semiconductor (BiCMOS) process and is available in a 32-lead, RoHS compliant, 5 mm × 5 mm LFCSP with an exposed pad. The device is specified over the −40°C to +85°C temperature range on a 5 V power supply.