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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)： | 2/24頁 |
| 文件大小： | 327K |
| 代理商： | TRF2056PWR |
TRF2056
LOW VOLTAGE 1.2GHz FRACTIONALN/INTEGERN SYNTHESIZER
SLWS111– NOVEMBER 2000
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
Table 1. 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 = SA7025 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:
01 = Modulo 2 prescaler (64/65)
10 = Modulo 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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