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參數(shù)資料
| 型號： | ADF4218LBRUZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 0K |
| 描述： | IC PLL FREQ SYNTHESIZER 20TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 時鐘/頻率合成器（RF/IF） |
| PLL： | 是 |
| 輸入： | CMOS，TTL |
| 輸出： | 時鐘 |
| 電路數(shù)： | 1 |
| 比率 - 輸入:輸出： | 3:1 |
| 差分 - 輸入:輸出： | 是/無 |
| 頻率 - 最大： | 3GHz |
| 除法器/乘法器： | 是/無 |
| 電源電壓： | 2.6 V ~ 3.3 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-TSSOP |
| 包裝： | 帶卷 (TR) |
REV. C
ADF4217L/ADF4218L/ADF4219L
–21–
SPI COMPATIBLE SERIAL BUS
LOCK
DETECT
VCO190-1750T
VCC
CPIF
IFIN
REFIN
DGND
RF
A
GND
RF
DGND
IF
A
GND
IF
CLK
DATA
LE
RFIN
MUXOUT
CPRF
VP1
VP2VDD2VDD1
ADF4217L/
ADF4218L/
ADF4219L
VCO190-200T
VCC
10MHz
TCXO
DECOUPLING CAPACITORS (22 F/10pF) ON VDD , VP OF THE ADF4217L/ADF4218L/ADF4219L.
THE TCXO AND ON VCC OF THE VCOs HAVE BEEN OMITTED FROM THE DIAGRAM TO AID CLARITY.
2.4pF
450pF
24nF
100pF
760pF
7.5nF
690pF
100pF
3.3k
18
51
1.5k
18
51
3.3k
RFOUT
VP
VDD
VP
IFOUT
4.7k
Figure 8. Local Oscillator Design for WCDMA System
In this circuit, the reference input signal is applied to the circuit
at REFIN by a 10 MHz TCXO (temperature controlled crystal
oscillator).
INTERFACING
The ADF4217L/ADF4218L/ADF4219L family has a simple
SPI
compatible serial interface for writing to the device. SCLK,
SDATA, and LE control the data transfer. When LE (latch
enable) goes high, the 22 bits that have been clocked into the
input register on each rising edge of SCLK will get transferred
to the appropriate latch. See Figure 1 for the timing diagram
and Table I for the latch truth table.
The maximum allowable serial clock rate is 20 MHz. This means
that the maximum update rate possible for the device is 909 kHz
or one update every 1.1
s. This is certainly more than adequate
for systems that will have typical lock times in hundreds of
microseconds.
ADuC812 Interface
Figure 9 shows the interface to the ADuC812 MicroConverter
.
Since the ADuC812 is based on an 8051 core, this interface can
be used with any 8051 based microcontroller. The MicroConverter
is set up for SPI Master Mode with CPHA = 0. To initiate the
operation, the I/O port driving LE is brought low. Each latch of
the ADF421xL family needs a 22-bit word. This is accomplished
by writing three 8-bit bytes from the MicroConverter to the
device. When the third byte has been written, the LE input should
be brought high to complete the transfer.
On first applying power to the ADF4217L family, it needs four
writes (one each to the R counter latch and the AB counter latch
for both RF1 and RF2 side) for the output to become active.
When operating in the mode described, the maximum SCLOCK
rate of the ADuC812 is 4 MHz. This means that the maximum
rate at which the output frequency can be changed will be about
180 kHz.
ADF4217L/
ADF4218L/
ADF4219L
CLK
DATA
LE
MUXOUT
(LOCK DETECT)
ADuC812
SCLK
MOSI
I/O PORTS
Figure 9. ADuC812 to ADF421xL Interface
ADSP2181 Interface
Figure 10 shows the interface between the ADF4217L family and
the ADSP-21xx digital signal processor. As previously discussed,
the ADF4217L family needs a 22-bit serial word for each latch
write. The easiest way to accomplish this using the ADSP-21xx
family is to use the autobuffered transmit mode of operation
with alternate framing. This provides a means for transmitting
an entire block of serial data before an interrupt is generated.
Set up the word length for eight bits and use three memory loca-
tions for each 22-bit word. To program each 22-bit latch, store
the three 8-bit bytes, enable the Autobuffered Mode, and then
write to the transmit register of the DSP. This last operation
initiates the autobuffer transfer.
ADF4217L/
ADF4218L/
ADF4219L
CLK
DATA
LE
MUXOUT
(LOCK DETECT)
ADSP-21xx
SCLK
DT
TFS
I/O FLAG
Figure 10. ADSP-21xx to ADF421xL Interface
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| ADF4218LBRUZ-REEL7 | 功能描述:IC PLL FREQ SYNTHESIZER 20TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:Precision Edge® 類型:時鐘/頻率合成器 PLL:無 輸入:CML，PECL 輸出:CML 電路數(shù):1 比率 - 輸入:輸出:2:1 差分 - 輸入:輸出:是/是 頻率 - 最大:10.7GHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-VFQFN 裸露焊盤，16-MLF? 供應(yīng)商設(shè)備封裝:16-MLF?（3x3） 包裝:帶卷 (TR) 其它名稱:SY58052UMGTRSY58052UMGTR-ND |
| ADF4219L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ADF4217L/18L/19L: Dual Low Power Frequency Synthesizers Data Sheet (Rev. B. 7/02) |
| ADF4219LBCC | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Dual Up to 188MHz 24-Pin LGA |
| ADF4219LBCC-REEL | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Dual Up to 188MHz 24-Pin LGA T/R |
| ADF4219LBCC-REEL7 | 制造商:Analog Devices 功能描述:PLL Frequency Synthesizer Dual Up to 188MHz 24-Pin LGA T/R |
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