F159V datasheet(39/78 Pages) RENESAS

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May 15, 2020

F159V Datasheet

Table 19. Reference Frequency Divider Values

Name

Description

Function

Reference

Frequency Doubler

Ref_Doubler

This is a 1-bit control word that will double the externally

applied reference frequency. This is the fifth bit on the

word of the 8-bit word.

The default value is 1 (doubler is on).

Reference

Frequency Divider

Ref_Doubler

This is a 4-bit control word that sets the divider for the

externally applied reference frequency. The value is

between 1 and 15. If the value is 0 then the divider is set

for 1. This is the first four bits of the word.

The default value is 1 = 0000b.

23.1.3.

Charge Pump

The charge pump current is programmable via the ICP register for maximum flexibility for PLL Bandwidth and performance. We recommend

that default value be used.

Table 20. Charge Pump

Name

Description

Function

ICP

Charge Pump

Current

ChrgPmp

This is a 4-bit control word that sets the output current of

the charge pump. This is the first four bits of the word.

The default value is 0.94mA = 0010b.

23.1.4.

External Loop Filter

An external loop filter is required which is connected between CP_OUT and VTUNE. The design is application specific. See Application Note

849 for a general description for a loop filter design.

23.1.5.

LO Frequency

The frequency that is used for the modulator is obtained from one of two paths. The first is from the internal VCO and PLL circuit. The output

frequency of the VCO can be divided by up to a factor of 8 using a 3-bit control word.

��_��=��

There is a switch that allows this internal signal or an external signal to be used. There is another divider that can be used to further reduce the

frequency by a factor of 2. This divider can be used on either the internal signal or the external frequency supplied.

��=��_��

��2 �� _��

��2

It is important to note that for the lower frequency LO signals (

��)lowerthan1.15GHz,thequadraturedividermustbeenabledtogenerate

the quadrature LO signal. At higher frequencies, an optimized filter is provided that properly splits the signal for the two paths, therefore the

quadrature divider must be disabled.

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