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Data Sheet
HMC832
Charge Pump Gain
Charge pump up and down gains are set by Register 0x09[6:0]
and Register 0x09[13:7], respectively. The current gain of the
pump in amps/radian is equal to the gain setting of this register
(Register 0x09) divided by 2π.
Typical CP gain setting is set to 2 mA to 2.5 mA; however, lower
values can also be used. Note that values less than 1 mA may
result in degraded phase noise performance.
For example, if both Register 0x09[13:7] and Register 0x09[6:0]
are set to 50 decimal, the output current of each pump is 1 mA,
and the phase frequency detector gain is kP = 1 mA/2π radians,
or 159 μA/rad. See the Charge Pump (CP) and Phase Detector
(PD) section for more information.
Figure 43. Charge Pump Gain and Offset Control
UP
PD
REF PATH
VCO PATH
LOOP
FILTER
UP GAIN
REG0x09[13:7]
UP OFFSET REG0x09[21]
0µA TO 635µA
5µA STEP
REG0x09[20:14]
DN OFFSET REG0x09[22]
0µA TO 635µA
5µA STEP
REG0x09[20:14]
0mA TO 2.54mA
20µA STEP
0mA TO 2.54mA
20µA STEP
DN GAIN
REG0x09[6:0]
DN
Rev. A | Page 21 of 48



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