Direct Modulation/Fast Waveform Generating,
13.5 GHz, Fractional-N Frequency Synthesizer
Data Sheet
ADF4169
FEATURES
GENERAL DESCRIPTION
RF bandwidth to 13.5 GHz
High and low speed FMCW ramp generation
The ADF4169 is a 13.5 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 130 MHz
capability. The device uses a 25-bit fixed modulus, allowing
subhertz frequency resolution.
Normalized phase noise floor of −224 dBc/Hz
FSK and PSK functions
Sawtooth and triangular 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 to 2 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 ADF4169 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 ADF4169 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 waveforms and
triangular waveforms. Sweeps can be set to run automatically
or with each step manually triggered by an external pulse. The
ADF4169 features cycle slip reduction (CSR) circuitry, which
enables faster lock times without the need for modifications to
the loop filter.
APPLICATIONS
Control of all on-chip registers is via a simple 3-wire interface. The
ADF4169 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 1.8 V
to 2 V. The device can be powered down when not in use.
FMCW radars
Communications test equipment
Communications infrastructure
FUNCTIONAL BLOCK DIAGRAM
AV
DV
SDV
V
R
SET
DD
DD
DD
P
ADF4169
SW2
CP
REFERENCE
×2
5-BIT
R COUNTER
REF
IN
DOUBLER
÷2
DIVIDER
+
PHASE
CHARGE
PUMP
FREQUENCY
DETECTOR
–
CSR
HIGH-Z
DGND
LOCK
DETECT
FAST LOCK
SWITCH
SW1
SERIAL DATA
OUTPUT
OUTPUT
MUX
MUXOUT
DV
DD
R DIVIDER/2
N DIVIDER/2
+
–
RF
RF
A
B
IN
N COUNTER
IN
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
CE
TX
DATA
CLK
DATA
LE
FRACTION MODULUS
25
INTEGER
VALUE
32-BIT
DATA
REGISTER
VALUE
2
VALUE
AGND
DGND
SDGND
CPGND
Figure 1.
Rev. 0
Document Feedback
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rightsof third parties that may result fromits use. Specifications subject to change without notice. No
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Technical Support
©2015 Analog Devices, Inc. All rights reserved.
www.analog.com
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