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參數(shù)資料
| 型號： | TRF2056PWR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封裝： | PLASTIC, SOP-20 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 327K |
| 代理商： | TRF2056PWR |
TRF2056
LOW VOLTAGE 1.2GHz FRACTIONALN/INTEGERN SYNTHESIZER
SLWS111– NOVEMBER 2000
21
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
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
RFIN or AUXIN
Figure 10. Main and Auxiliary Phase Detector Circuit
charge-pump current plans
The TRF2056 device 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 6 shows how the external
resistors achieve desired charge-pump peak currents.
Table 6. 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 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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