參數(shù)資料
型號: TRF2050PW
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, SO-20
文件頁數(shù): 11/34頁
文件大?。?/td> 543K
代理商: TRF2050PW
TRF2050
LOW-VOLTAGE 1.2-GHz FRACTIONAL-N/INTEGER-N SYNTHESIZER
SLWS030E– JUNE 1996 – REVISED OCTOBER 2000
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Table 2. SA7025 Emulation Serial-Word-Format Function Listing
SYMBOL
BITS
FUNCTION
CK
4
Binary acceleration factor for integral charge pump current
CL
2
Binary acceleration factor for proportional charge pump current
CN
8
Binary current-setting factor for main charge pumps
EA
1
Auxiliary divider enable flag:
0 = disabled
1 = enabled
EM
1
Main divider enable flag:
0 = disabled
1 = enabled
FMOD
1
Fractional-N modulus selection:
0 = modulo 5
1 = modulo 8
LONG
1
A word format selection:
0 = 24-bit A0 format
1 = 32-bit A1 format
MS
2
Mode select
00 = 7025 Emulation Mode
NA
12
Auxiliary divider ratio
NF
3
Fractional-N increment
NM1
12
Number of main divider cycles when prescaler modulus = 64
NM2
8 if PR = 01
4 if PR = 10
Number of main divider cycles when prescaler modulus = 65
NM3
4 if PR = 10
Number of main divider cycles when prescaler modulus = 72
NR
12
Reference divider ratio
PA
1
Auxiliary prescaler select:
0 = divide by 4
1 = divide by 1
PR
2
Prescaler type:
PR = 01; modulus 2 prescaler (64/65)
PR = 10; modulus 3 prescaler (64/65/72)
SA
2
Reference select for auxiliary phase detector
SM
2
Reference select for main phase detector
T
2
Test mode connection of internal signals to the LOCK terminal:
00 = ACCU overflow
01 = Auxiliary divider
10 = Main divider
11 = Reference divider
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