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參數(shù)資料
| 型號： | SA7025DK |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | XO, clock |
| 英文描述： | Low-voltage 1GHz fractional-N synthesizer |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 1000 MHz, PDSO20 |
| 封裝： | PLASTIC, SOT-266, SSOP-20 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大小： | 304K |
| 代理商： | SA7025DK |
Philips Semiconductors
Product specification
SA7025
1GHz low-voltage Fractional-N synthesizer
1996 Aug 6
12
Table 1. Function Table
Symbol
Bits
Function
NM1
12
Number of main divider cycles when prescaler modulus = 64
*
Number of main divider cycles when prescaler modulus = 65
*
NM2
8 if PR = “01”
4 if PR = “10”
NM3
4 if PR = “10”
Number of main divider cycles when prescaler modulus = 72
*
Prescaler type in use
PR = “01”: modulus 2 prescaler (64/65)
PR = “10”: modulus 3 prescaler (64/65/72)
Fractional-N increment
Fractional-N modulus selection flag
“1”: modulo 8
“0”: modulo 5
A word format selection flag
“0”: 24 bit A0 format
“1”: 32 bit A1 format
Binary current setting factor for main charge pumps
Binary acceleration factor for proportional charge pump current
Binary acceleration factor for integral charge pump current
Main divider enable flag
Auxiliary divider enable flag
Reference select for main phase detector
Reference select for auxiliary phase detector
Reference divider ratio
Auxiliary divider ratio
Auxiliary prescaler mode:
PA = “0”: divide by 4
PA = “1”: divide by 1
PR
2
NF
3
1
FMOD
LONG
1
CN
CL
CK
EM
EA
SM
SA
NR
NA
8
2
4
1
1
2
2
12
12
PA
1
*
Not including reset cycles and Fractional-N effects.
SA = “11”
SA = “10”
SA = “01”
SA = “00”
SM = “11”
SM = “10”
SM = “01”
SM = “00”
MAIN SELECT
AUXILIARY SELECT
REFERENCE
INPUT
DIVIDE BY NR
÷
2
MAIN
PHASE
DETECTOR
AUXILIARY
PHASE
DETECTOR
÷
2
÷
2
SR00606
Figure 7. Reference Divider
Table 2. Prescaler Ratio
The total division ratio from prescaler to the phase detector may be expressed as:
if PR = “01”
N = (NM1 + 2) x 64 + NM2 x 65
N’ = (NM1 + 1) x 64 + (NM2 + 1) x 65 (*)
if PR = “10”
N = (NM1 + 2) x 64 + NM2 x 65 + (NM3 + 1) x 72
N’ = (NM1 + 1) x 64 + (NM2 + 1) x 65 + (NM3 + 1) x 72 (*)
(*) When the fractional accumulator overflows the prescaler ratio = 65 (64 + 1) and the total division ratio N’ = N + 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SA7026 | 1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA7026DH | 1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA702 | Divide by: 64/65/72 triple modulus low power ECL prescaler |
| SA702D | Divide by: 64/65/72 triple modulus low power ECL prescaler |
| SA702N | Divide by: 64/65/72 triple modulus low power ECL prescaler |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA7026 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA7026DH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:1.3GHz low voltage fractional-N dual frequency synthesizer |
| SA702D | 制造商:NXP Semiconductors 功能描述: 制造商: 功能描述: 制造商:undefined 功能描述: |
| SA702N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Divide by: 64/65/72 triple modulus low power ECL prescaler |
| SA703 | 制造商:Datak Corporation 功能描述:Precision ScrewDriver Set |
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