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參數(shù)資料
| 型號： | SA8025A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | ECONOLINE: RB & RA - Dual Output from a Single Input Rail- Power Sharing on Output- Industry Standard Pinout- 1kVDC & 2kVDC Isolation- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 85% |
| 中文描述： | 低電壓1.8GHz的分數(shù)N頻率合成器 |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 456K |
| 代理商： | SA8025A |
Philips Semiconductors
Product specification
SA8025A
1.8GHz low-voltage Fractional-N synthesizer
1996 Oct 15
14
REFERENCE R
MAIN N
DETECTOR
OUTPUT
CONTENTS
ACCUM.
FRACTIONAL
COMPCURRENT
N
N
N + 1
N
N + 1
2
4
1
3
0
PULSE-WIDTH
MODULATION
OUTPUT ON
PHP, PHI
PULSE-LEVEL
MODULATION
mA
μ
A
TIME
VCO CYCLES
SR00560
Figure 9. Waveforms for NF = 2, Fraction = 0.4
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.
When the serial input A word is loaded, the output circuits are in the
“speed-up mode” as long as the STROBE is H, else the “normal
mode” is active. In the “normal mode” the current output PHP is:
I
PHP_N
I
PHP
I
PHP_comp
where:
|I
PHP
|
CN
I
RN
32
:charge pump current
|I
PHP_comp
|
FRD
I
RF
128
:fractional comp.
current
The current in PHI is zero in “normal mode”.
In “speed-up mode” the current in output PHP is:
I
PHP_S
I
PHP
I
PHP_comp
|I
PHP
|
CN
I
RN
32
(2
CL
1
1)
|I
PHP_comp
|
FRD
I
RF
128
(2
CL
1
1)
In “speed-up mode” the current in output PHI is:
I
PHI_S
I
PHI
I
PHI_comp
where:
|I
PHI
|
CN
I
RN
32
(2
CL
1
) CK
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SA8025ADK | Low-voltage 1.8GHz fractional-N synthesizer |
| SA8026 | 2.5GHz low voltage fractional-N dual frequency synthesizer |
| SA8026DH | ECONOLINE: RB & RA - Dual Output from a Single Input Rail- Power Sharing on Output- Industry Standard Pinout- 1kVDC & 2kVDC Isolation- Custom Solutions Available- UL94V-0 Package Material- Efficiency to 85% |
| SA8027 | 2.5 GHz low voltage, low power RF fractional-N/IF integer frequency synthesizer |
| SA8027DH | 2.5 GHz low voltage, low power RF fractional-N/IF integer frequency synthesizer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA8025ADK | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Low-voltage 1.8GHz fractional-N synthesizer |
| SA8026 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5GHz low voltage fractional-N dual frequency synthesizer |
| SA8026DH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5GHz low voltage fractional-N dual frequency synthesizer |
| SA8027 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:2.5 GHz low voltage, low power RF fractional-N/IF integer frequency synthesizer |
| SA8027DH | 功能描述:鎖相環(huán) - PLL DUAL FRACTIONAL N SYNTHESIZER RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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