- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄372107 > SA8026 (NXP Semiconductors N.V.) 2.5GHz low voltage fractional-N dual frequency synthesizer PDF資料下載
參數(shù)資料
| 型號(hào)： | SA8026 |
| 廠(chǎng)商： | NXP Semiconductors N.V. |
| 英文描述： | 2.5GHz low voltage fractional-N dual frequency synthesizer |
| 中文描述： | 2.5GHz的低電壓小數(shù)N頻率合成器雙 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大?。?/td> | 289K |
| 代理商： | SA8026 |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)當(dāng)前第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)
Philips Semiconductors
Product specification
SA8026
2.5GHz low voltage fractional-N dual frequency
synthesizer
1999 Nov 04
7
FUNCTIONAL DESCRIPTION
Main Fractional-N divider
The RFin inputs drive a pre-amplifier to provide the clock to the first
divider stage. For single ended operation, the signal should be fed to
one of the inputs while the other one is AC grounded. The
pre-amplifier has a high input impedance, dominated by pin and pad
capacitance. The circuit operates with signal levels from –18 dBm to
0 dBm, and at frequencies as high as 2.5 GHz. The divider consists
of a fully programmable bipolar prescaler followed by a CMOS
counter. Total divide ratios range from 512 to 65536.
At the completion of a main divider cycle, a main divider output
pulse is generated which will drive the main phase comparator. Also,
the fractional accumulator is incremented by the value of NF. The
accumulator works with modulo Q set by FMOD. When the
accumulator overflows, the overall division ratio N will be increased
by 1 to N + 1, the average division ratio over Q main divider cycles
(either 5 or 8) will be
Nfrac
N
NF
Q
The output of the main divider will be modulated with a fractional
phase ripple. The phase ripple is proportional to the contents of the
fractional accumulator and is nulled by the fractional compensation
charge pump.
The reloading of a new main divider ratio is synchronized to the
state of the main divider to avoid introducing a phase disturbance.
Auxiliary divider
The AUXin input drives a pre-amplifier to provide the clock to the
first divider stage. The pre-amplifier has a high input impedance,
dominated by pin and pad capacitance. The circuit operates with
signal levels from –18dBm to 0 dBm (80 to 636 mVpp), and at
frequencies as high as 550 MHz. The divider consists of a fully
programmable bipolar prescaler followed by a CMOS counter. Total
divide ratios ranges from 128 to 16383.
Reference divider
The reference divider consists of a divider with programmable
values between 4 and 1023 followed by a three bit binary counter.
The 3 bit SM (SA) register (see figure 4) determines which of the 5
output pulses are selected as the main (auxiliary) phase detector
input.
Phase detector (see Figure 5)
The reference and main (aux) divider outputs are connected to a
phase/frequency detector that controls the charge pump. The pump
current is set by an external resistor in conjunction with control bits
CP0 and CP1 in the C-word (see Charge Pump table). The dead
zone (caused by finite time taken to switch the current sources on or
off) is cancelled by forcing the pumps ON for a minimum time at
every cycle (backlash time) providing improved linearity.
SR01415
DIVIDE BY R
/2
/2
/2
/2
REFERENCE
INPUT
SM=”000”
SM=”001”
SM=”010”
SM=”011”
SM=”100”
SA=”100”
SA=”011”
SA=”010”
SA=”001”
SA=”000”
TO
MAIN
PHASE
DETECTOR
TO
AUXILIARY
PHASE
DETECTOR
Figure 4.
Reference Divider
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| SA8027W | 2.5 GHz low voltage, low power RF fractional-N/IF integer frequency synthesizer |
| SA8028 | 2.5 GHz sigma delta fractional-N / 760 MHz IF integer frequency synthesizers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SA8026DH | 制造商:PHILIPS 制造商全稱(chēng):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(chēng):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(lèi)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 |
| SA8027DH,512 | 功能描述:射頻無(wú)線(xiàn)雜項(xiàng) DUAL FRACTIONAL N RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| SA8027DH,518 | 功能描述:鎖相環(huán) - PLL DUAL FRACTIONAL N RoHS:否 制造商:Silicon Labs 類(lèi)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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。