Moteur de recherche de fiches techniques de composants électroniques
Selected language     French  ▼
Nom de la pièce
         Description


CX74038 Datasheet(Fiches technique) 3 Page - Skyworks Solutions Inc.

Numéro de pièce CX74038
Description  2.6 GHz/800 MHz Dual Fractional-N/lnteger-N Frequency Synthesizer
Télécharger  12 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Fabricant  SKYWORKS [Skyworks Solutions Inc.]
Site Internet  http://www.skyworksinc.com
Logo 

 
 3 page
background image
DATA SHEET • CX74038
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
101075I • Skyworks Proprietary and Confidential information • Products and product information are subject to change without notice • January 31, 2005
3
DAT
CLK
LE
tDSU
tDHD
tCKH
tCLE
tLEW
tLEC
tCKL
C1457
Figure 3. CX74038 Serial Data Input Timing Diagram (MSB First)
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
0
1
SP2
EN
1
0
SP1
SC1
PS
ME
1
1
FN
IF
RF
N1 DIVIDER
R1 DIVIDER
N2 DIVIDER
0
0
SC2
LD
R2 DIVIDER
D14
D15
D16
D17
D18
D19
D20
D21
LSB
MSB
C1456
Figure 4. CX74038 Serial Data Word Format
Registers
The CX74038 includes four 22-bit registers that can be
programmed independently in any order. Bits D0 and D1
represent the register addresses. For more information on
registers, addresses, and format, refer to the Synthesizer Register
Programming section of this document.
A dithering disable function is accessible via word 00, data bits
21 and 20. When the RF synthesizer is programmed for fractional
divide values, these bits should be programmed to 1 0 (dithering
enable). However, when the RF synthesizer is programmed to
output a frequency which is a whole integer multiple of the
comparison frequency, the synthesizer should be programmed for
dithering disabled (bits set to 11). This improves the phase noise
when operating on integer-N boundaries. These data bits must be
programmed after power-up, otherwise erroneous device
operation may occur. Refer to the Synthesizer Register
Programming section of this document for bit definitions.
Voltage Controlled Oscillator (VCO) Prescalers
The VCO prescalers, P/P+1 and Q/Q+1, provide low noise signal
conditioning of the VCO signals. They translate from an off-chip,
single-ended or differential signal to an on-chip differential signal.
By changing the PS bit, the RF synthesizer has the option to use
either the 8/9 or the 16/17 prescaler depending on the desired
operational frequency. The maximum frequency is 2.6 GHz for the
16/17 prescaler and 1.4 GHz for the 8/9 prescaler. The IF
synthesizer has a fixed 16/17 prescaler with a maximum
frequency of 800 MHz.
RF and IF Dividers
The CX74038 provides programmable dividers that control the
prescaler and supply the divided VCO signals to the charge pump
phase detectors. Programmable ratios on the RF fractional-N
synthesizer ranging from 256 to 212 are possible with the 16/17
prescaler, and from 64 to 211 with the 8/9 prescaler. The IF
integer-N synthesizer has a programmable divide ratio ranging
from 256 to 217.
Reference Frequency Dividers
The reference signal can be divided by a ratio of 1 to 7 for the RF
reference divider (R1) and from 1 to 8192 for the IF reference
divider (R2). The input frequency for the reference signal can be
as high as 50 MHz.
Phase Detectors and Charge Pumps
The CX74038 uses a separate charge pump phase detector for
each synthesizer. The IF and RF Phase/Frequency Detector (PFD)




Html Pages

1  2  3  4  5  6  7  8  9  10  11  12 


Datasheet Download



Numéro de composants électroniques

Numéro de pièceDescription des composantsHtml ViewFabricant
LMX23642.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer 1 2 3 4 5 MoreNational Semiconductor (TI)
GM653560 MHz Universal Programmable Dual PLL Frequency synthesizer 1 2 3 4 5 MoreHynix Semiconductor
LMX2330APLLatinum™ Dual Frequency Synthesizer for RF Personal Communications 1 2 3 4 5 MoreNational Semiconductor (TI)
MPC924321360 MHz Dual Output LVPECL Clock Synthesizer 1 2 3 4 5 MoreMotorola, Inc
ADF4212LDual Low Power PLL Frequency Synthesizer 1 2 3 4 5 MoreAnalog Devices
MB15F03Dual Serial Input PLL Frequency Synthesizer 1 2 3 4 5 MoreFujitsu Component Limited.
LMX2330LPLLatinum™ Low Power Dual Frequency Synthesizer for RF Personal Communications 1 2 3 4 5 MoreNational Semiconductor (TI)
MLS9033-00766Surface Mount Frequency Synthesizer CDMA 754-779 MHz 1 2 Tyco Electronics
MB1519DUAL SERIAL INPUT PLL FREQUENCY SYNTHESIZER 1 2 3 4 5 MoreFujitsu Component Limited.
LC72134MDual PLL Frequency Synthesizer for FM Tuner Systems 1 2 3 4 5 MoreSanyo Semicon Device

Lien URL

AllDATASHEET vous a-t-il été utile ?   [ DONATE ]  

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Favoris   |   Echange de liens   |   Fabricants
All Rights Reserved © Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  , Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp  |   Russian : Alldatasheetru.com
Korean : Alldatasheet.co.kr   |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com  |   Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl