参数资料
型号: TRF2050PW
厂商: TEXAS INSTRUMENTS INC
元件分类: PLL合成/DDS/VCOs
英文描述: PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20
封装: PLASTIC, SO-20
文件页数: 24/34页
文件大小: 543K
代理商: TRF2050PW
TRF2050
LOW-VOLTAGE 1.2-GHz FRACTIONAL-N/INTEGER-N SYNTHESIZER
SLWS030E– JUNE 1996 – REVISED OCTOBER 2000
30
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
phase detectors (continued)
D
SET
Q
CLR
D
SET
Q
CLR
1
Reference Divider
/NR
Main or Auxiliary
Reference Divider
/N or /NR
VDDA
VSSA
Charge Pump
Output
REFIN
REFIN or AUXIN
Figure 25. Main and Auxiliary Phase Detector Circuit
charge-pump current plans
The TRF2050 uses internal band-gap references and external resistors to develop biasing reference currents
for the various charge pumps sections. Three terminals are designated for the external resistors: RN, RF, and
RA. Internal, programmable coefficients CN, CL, and CK are also used. Table 7 shows how the external resistors
are used to achieve desired charge-pump peak currents.
Table 7. Charge Pump Current Plans
PARAMETER
MODE
CONDITION
UNIT
Peak proportional, normal mode current PHP
PK
*NM +
18.75
RN
) 0.75
x
CN
256
Normal
RN in k
mA
Peak proportional, speed-up mode current
PHP
PK
*SM +
18.75
RN
) 0.75
x
CN
256
)
18.75
RN
) 0.75
x
CN
256
x2CL)1
Speed-up
RN in k
mA
Peak integral, speed-up mode current PHI
PK
*SM +
18.75
RN
) 0.75
x
CN
256
xCKx 2CL)1
Speed-up
RN in k
mA
Peak compensation, normal mode current CompPK +
30
RF
Normal
RF in k
A
Peak auxiliary current PHA
PK +
1.25
RA
x20
Normal
RA in k
mA
The compensation charge-pump current is a pulse-amplitude modulated with the contents of the fractional accumulator. See the section on Main
Divider – Fractional-N Sidebands and Compensation.
The average charge-pump current for the PHP, PHI, and PHA terminals is defined by:
I
AVG +
qerror
2
p
xI
PK
.
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