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參數(shù)資料
| 型號(hào)： | 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)： | 11/22頁 |
| 文件大?。?/td> | 304K |
| 代理商： | SA7025DK |
Philips Semiconductors
Product specification
SA7025
1GHz low-voltage Fractional-N synthesizer
1996 Aug 6
11
MSB
LSB
WORD
A1
A0
B
C
D
E
ADDRESS BITS
TEST BITS
D31
D0
0
NF
NM1
NM2
NM3
NM2
CN
D0
0
NF
NM1
NM2
NM3
NM2
D23
PR = “01”
PR = “10”
1
0
0 0
CN
CK
CL
PR
1
0
0
NA
1
P
A
1
0
1
NR
0
SM
E
M
SA
E
A
F
M
O
D
L
O
N
G
1
1
1 1
D23
D0
0
0
0 0
0
0 0
T
1
T
0
0
0
LAST IN
FIRST IN
SR00605
Figure 6. Serial Input Word Format
Current Settings
The SA7025 has 3 current setting pins: RA, RN and RF. The active
charge pump currents and the fractional compensation currents are
linearly dependent on the current connected between the current
setting pin and V
SS
. The typical value R (current setting resistor)
can be calculated with the formula:
R
V
DDA
0.9
150
I
R
I
R
The current can be set to zero by connecting the corresponding pin
to V
DDA
.
Auxiliary Output Charge Pumps
The auxiliary charge pumps on pin PHA are driven by the auxiliary
phase detector and the current value is determined by the external
resistor RA at pin RA. The active charge pump current is typically:
|I
PHA
|
8
I
RA
Main Output Charge Pumps and Fractional
Compensation Currents
The main charge pumps on pin PHP and PHI are driven by the main
phase detector and the current value is determined by the current at
pin RN and via a number of DACs which are driven by registers of
the serial input. The fractional compensation current is determined
by the current at pin RF, the contents of the fractional accumulator
FRD and a number of DACs driven by registers from the serial input.
The timing for the fractional compensation is derived from the
reference divider. The current is on during 1 input reference cycle
before and 1 cycle after the output signal to the phase comparator.
Figure 9 shows the waveforms for a typical case.
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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