RFMD2081
Overview
- RF Output Frequency Range 45MHz to 2700MHz Fractional-N Synthesizer with Very Low Spurious Levels Typical Step Size 1.5Hz Fully Integrated Wideband VCOs and LO Buffers Integrated Phase Noise <0.2° rms at 1GHz -40dBc Unadjusted Carrier Suppression -40dBc Unadjusted Sideband Suppression 100MHz Baseband Input 3dB Bandwidth Very Low Noise Floor -162dBm/Hz Typical Output P1dB + 4dBm Output IP3 + 17dBm 2.7V to 3.3V Power Supply 135mA Typical Current Consumption Serial Programming Interface Functional Block Diagram
- Phase det . Synth * *
- Ref. divider * *
- Product Description The RFMD2081 is a low power, wideband, IQ modulator with integrated fractional-N synthesizer and voltage controlled oscillator (VCO). The modulator features an input 3dB bandwidth of 100MHz, and can generate output frequencies of between 45MHz and 2700MHz, making it suitable for a wide range of applications. The fractional-N synthesizer takes advantage of an advanced sigma-delta architecture that delivers ultra-fine step sizes and low spurious products. The synthesizer/VCO, combined with an external loop filter, allows the user to generate local oscillator (LO) signals from 90MHz to 5400MHz. The LO signal is buffered and routed to a high accuracy quadrature divider (/2) that drives the balanced I and Q mixers. The output of the mixers are summed and applied to a differential RF output stage. This device also features a differential input for an external VCO or LO source. Device programming is achieved via a simple 3-wire serial interface. In addition, a unique programming mode allows up to four devices to be controlled from a common serial bus. This eliminates the need for separate chip-select control lines between each device and the host controller. Up to six general purpose outputs are provided, which can be used to access internal signals (the LOCK signal
