I want to create a transmitter with 900MHz frequency and "MSK Modulation",i used ADF4159 to create waveform,is there a chip like "ADF4159" to create msk modulation? thanks.
I believe the ADF5356 should be able to support MSK modulation as it has both phase resync and phase adjust (which can now be used simultaneously) to hop between various quadrature settings. Unless the modulation rate were is low (settling time is ~3mS) you'll need to take additional steps to increase this. Contact the factory directly for more information.
The HMC703 also has a simple FSK feature that allows a digital input pin to control the output frequency resulting in an non-symbol shaped (square wave) modulation. In all cases (ADF4159, ADF5356, HMC703), this unshaped modulation is not spectrally efficient. However, there are applications that can accept that constraint.
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