Bbpll Charge Pump; Bbpll Loop Filter - Analog Devices AD9361 Reference Manual

AD9361 Reference Manual

BBPLL CHARGE PUMP

The charge pump has programmable output current from
25 µA to 1575 µA in 25 µA steps. In addition, a programmable
bleed current is available. This is an NMOS current source
programmable from 0 µA to 316 µA.

BBPLL LOOP FILTER

The loop filter is fully integrated on-chip and is a standard
passive Type II third-order filter with five programmable
components. The filter is programmed by the
ad9361_bbpll_set_rate function.
I
CP
Figure 8. BBPLL Internal Loop Filter (R2 and C3 Can Be Bypassed)
Rev. A | Page 21 of 128
R2 VCO TUNE
R1
C2 C3
C1
UG-570