STW81200 - how to set second VCO output to work in quadrature?

[KSiwi]

Hi,

In the STW81200 it is written that the second VCO output can be set to work in-phase or in quadrature to the primary one.

In the control registers I can not find a field that is responsible for that option. How should I configure the IC to have second VCO output working in quadrature in respect to primary one?

Thank you in advance and best regards,

Krzysztof