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| 型號： | ADF7020BCP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | High Performance ISM Band FSK/ASK Transceiver IC |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, LFCSP-48 |
| 文件頁數(shù)： | 13/40頁 |
| 文件大小： | 797K |
| 代理商： | ADF7020BCP |
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Preliminary Technical Data
ADF7020
VCO Bias Current
Rev. PrH | Page 13 of 40
VCO bias current can be adjusted using Bits R1_DB19 to
R1_DB16. To ensure VCO oscillation, the minimum bias
current setting under typical conditions is 2.5 mA.
VCO
LOOP FILTER
MUX
VCO SELECT BIT
TO PA AND
N DIVIDER
VCO BIAS
R1_DB (16:19)
220
μ
F
0
CVCO PIN
÷
2
÷
2
Figure 10. Voltage Controlled Oscillator (VCO)
CHOOSING CHANNELS FOR BEST SYSTEM
PERFORMANCE
The fractional-N PLL allows the selection of any channel within
868 MHz to 928 MHz (and 433MHz using divide-by-2) to a
resolution of <100 Hz. This also facilitates frequency hopping
systems.
Careful selection of the RF transmit channels must be made to
achieve best spurious performance. The architecture of
fractional-N results in some level of the nearest integer channel
moving through the loop to the RF output. These “beat-note”
spurs are not attenuated by the loop, if the desired RF channel
and the nearest integer channel are separated by a frequency of
less than the LBW.
The occurrence of beat-note spurs is rare, because the integer
frequencies are at multiples of the reference, which is typically
>10 MHz.
Beat-note spurs can be significantly reduced in amplitude by
avoiding very small or very large values in the fractional
register, using the frequency doubler. By having a channel
1 MHz away from an integer frequency, a 100 kHz loop filter
can reduce the level to <45 dBc. When using an external VCO,
the fast lock (bleed) function reduces the spurs to <60 dBc for
the same conditions.
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| ADF7020BCPZ | 功能描述:IC TX FSK/ASK ISM BAND 48LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數(shù)據(jù)傳輸率 - 最大:54Mbps 調(diào)制或協(xié)議:* 應(yīng)用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
| ADF7020BCPZ-RL | 功能描述:IC TX FSK/ASK ISM BAND 48LFCSP RoHS:是 類別:RF/IF 和 RFID >> RF 收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:30 系列:- 頻率:4.9GHz ~ 5.9GHz 數(shù)據(jù)傳輸率 - 最大:54Mbps 調(diào)制或協(xié)議:* 應(yīng)用:* 功率 - 輸出:-3dBm 靈敏度:- 電源電壓:2.7 V ~ 3.6 V 電流 - 接收:* 電流 - 傳輸:* 數(shù)據(jù)接口:PCB，表面貼裝 存儲容量:- 天線連接器:PCB，表面貼裝 工作溫度:-25°C ~ 85°C 封裝/外殼:68-TQFN 裸露焊盤 包裝:管件 |
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