Why does the IDT 8V97051 register map have two “extended registers”? What makes them different from the other registers?

In addition to provide the best combination of phase noise and spurious performance, wide output frequency range and low power consumption, the 8V97051 is also pin compatible with similar solutions from other manufacturers. In order to keep some level of software compatibility, the 8V97051 has six main registers that need to be programmed for normal operation. In addition, in order to provide more control of the Local Oscillator (LO) function, the 8V97051 has two optional additional registers, called “extended registers”, that provide additional features such as increased output frequency resolution (16 bits), more RF output power options, more DSM types and orders, a Device ID and Rev ID, as well as a Readback mode.

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Title Other Languages Type Format File Size Date
Datasheets & Errata
8V97051 Datasheet Datasheet PDF 1024 KB Aug 8, 2018
8V97051 Low-Power Wideband RF Synthesizer / PLL 日本語 Product Brief PDF 368 KB Nov 29, 2016