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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?jǐn)?shù)N頻率合成器 |
| 文件頁數(shù)： | 13/23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
13
REF_IN
RDIVIDER
AUX/MAIN
DIVIDER
L
“1”
R
D
C
Q
R
D
C
Q
R
“1”
X
P
N
N-TYPE
CHARGE PUMP
PH
P-TYPE
CHARGE PUMP
V
DDA
V
SSA
REF_IN
L
R
X
P
N
I
PH
SR00630
Figure 8. Phase Detector Structure with Timing
Phase Detectors
The auxiliary and main phase detectors are a two D-type flip-flop
phase and frequency detector shown in Figure 8. The flip-flops are
set by the negative edges of output signals of the dividers. The
rising edge of the signal, L, will reset the flip-flops after both flip-flops
have been set. Around zero phase error this has the effect of
delaying the reset for 1 reference input cycle. This avoids
non-linearity or deadband around zero phase error. The flip-flops
drive on-chip charge pumps. A source current from the charge
pump indicates the VCO frequency will be increased; a sink current
indicates the VCO frequency will be decreased.
Current Settings
The SA8025A 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
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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