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ADF4159_14

更新时间： 2024-12-02 01:11:55
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亚德诺 - ADI /
页数 文件大小 规格书
36页 653K
描述
Direct Modulation/Fast Waveform Generating,

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Direct Modulation/Fast Waveform Generating,  
13 GHz, Fractional-N Frequency Synthesizer  
Data Sheet  
ADF4159  
FEATURES  
GENERAL DESCRIPTION  
RF bandwidth to 13 GHz  
High and low speed FMCW ramp generation  
The ADF4159 is a 13 GHz, fractional-N frequency synthesizer  
with modulation and both fast and slow waveform generation  
25-bit fixed modulus allows subhertz frequency resolution  
PFD frequencies up to 110 MHz  
capability. The part uses a 25-bit fixed modulus, allowing subhertz  
frequency resolution.  
Normalized phase noise floor of −224 dBc/Hz  
FSK and PSK functions  
Sawtooth, triangular, and parabolic waveform generation  
Ramp superimposed with FSK  
Ramp with 2 different sweep rates  
Ramp delay, frequency readback, and interrupt functions  
Programmable phase control  
2.7 V to 3.45 V analog power supply  
1.8 V digital power supply  
Programmable charge pump currents  
3-wire serial interface  
Digital lock detect  
ESD performance: 3000 V HBM, 1000 V CDM  
Qualified for automotive applications  
The ADF4159 consists of a low noise digital phase frequency  
detector (PFD), a precision charge pump, and a programmable  
reference divider. The Σ-Δ-based fractional interpolator allows  
programmable fractional-N division. The INT and FRAC registers  
define an overall N divider as N = INT + (FRAC/225).  
The ADF4159 can be used to implement frequency shift keying  
(FSK) and phase shift keying (PSK) modulation. Frequency sweep  
modes are also available to generate various waveforms in the  
frequency domain, for example, sawtooth and triangular wave-  
forms. Sweeps can be set to run automatically or with each step  
manually triggered by an external pulse. The ADF4159 features  
cycle slip reduction circuitry, which enables faster lock times  
without the need for modifications to the loop filter.  
Control of all on-chip registers is via a simple 3-wire interface. The  
ADF4159 operates with an analog power supply in the range of  
2.7 V to 3.45 V and a digital power supply in the range of 1.62 V  
to 1.98 V. The device can be powered down when not in use.  
APPLICATIONS  
FMCW radars  
Communications test equipment  
Communications infrastructure  
FUNCTIONAL BLOCK DIAGRAM  
AV  
DV  
SDV  
V
R
SET  
DD  
DD  
DD  
P
ADF4159  
SW2  
CP  
REFERENCE  
5-BIT  
R COUNTER  
×2  
REF  
IN  
DOUBLER  
÷2  
DIVIDER  
+
–
PHASE  
FREQUENCY  
DETECTOR  
CHARGE  
PUMP  
HIGH-Z  
CSR  
DGND  
LOCK  
DETECT  
FAST LOCK  
SWITCH  
SW1  
OUTPUT  
MUX  
MUXOUT  
SD  
DV  
OUT  
DD  
R
DIV  
DIV  
+
–
RF  
RF  
A
B
IN  
N COUNTER  
N
IN  
THIRD-ORDER  
FRACTIONAL  
INTERPOLATOR  
CE  
TX  
DATA  
CLK  
FRACTION  
VALUE  
MODULUS  
25  
VALUE  
INTEGER  
VALUE  
32-BIT  
DATA  
REGISTER  
DATA  
LE  
2
AGND  
DGND  
SDGND  
CPGND  
Figure 1.  
Rev. E  
Document Feedback  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rightsof third parties that may result fromits use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks andregisteredtrademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2013–2014 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
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