K Band Downconverter with Integrated
Fractional-N PLL and VCO
ADMV4420
Data Sheet
FEATURES
GENERAL DESCRIPTION
RF front end with integrated RF balun and LNA
The ADMV4420 is a highly integrated, double balanced, active
Double balanced, active mixer with high dynamic range IF
amplifier
mixer with an integrated fractional-N synthesizer, ideally suited
for next generation K band satellite communications.
Fractional-N synthesizer with low phase noise, multicore VCO
5 V supply operation with integrated LDO regulators
Output P1dB: 7 dBm
Output IP3: 16 dBm
Conversion gain: 36 dB
The RF front end consists of an integrated RF balun and low
noise amplifier (LNA) for an optimal, 7 dB, single-sideband
noise figure while minimizing external components. Additionally,
the high dynamic range IF output amplifier provides a nominal
conversion gain of 36 dB.
Noise figure: 7 dB
An integrated low phase noise, fractional-N, phase-locked loop
(PLL) with a multicore voltage controlled oscillator (VCO) and
internal 2× multiplier generate the necessary on-chip 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.
RF input frequency range: 16.95 GHz to 22.05 GHz
Internal LO frequency range: 16.35 GHz to 21.15 GHz
IF frequency range: 900 MHz to 2500 MHz
Single-ended 50 Ω input impedance and 75 Ω IF output
impedance
Programmable via 4-wire SPI
32-lead, 5 mm × 5 mm LFCSP
The reference input to the PLL employs a differentially excited
50 MHz crystal oscillator. Alternatively, the reference input can
be driven by an external, singled-ended, 50 MHz source. The
phase frequency detector (PFD) comparison frequency of the
PLL operates up to 50 MHz.
APPLICATIONS
Satellite communication
Point to point microwave communication
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 package with an exposed pad. The device is
specified over the −40°C to +85°C temperature range on a 5 V
power supply.
Rev. A
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