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ADF4159 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADF4159
Beschreibung Fractional-N Frequency Synthesizer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 30 Seiten
ADF4159 Datasheet, Funktion
Data Sheet
Direct Modulation/Fast Waveform Generating,
13 GHz, Fractional-N Frequency Synthesizer
ADF4159
FEATURES
GENERAL DESCRIPTION
RF bandwidth to 13 GHz
High and low speed FMCW ramp generation
25-bit fixed modulus allows subhertz frequency resolution
PFD frequencies up to 110 MHz
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
The ADF4159 is a 13 GHz, fractional-N frequency synthesizer
with modulation and both fast and slow waveform generation
capability. The part uses a 25-bit fixed modulus, allowing subhertz
frequency resolution.
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. The ADF4159 features cycle slip reduction circuitry, which
enables faster lock times without the need for modifications to
the loop filter.
APPLICATIONS
FMCW radars
Communications test equipment
Communications infrastructure
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.
FUNCTIONAL BLOCK DIAGRAM
AVDD DVDD SDVDD
VP
RSET
ADF4159
REFIN
×2
DOUBLER
5-BIT
R COUNTER
÷2
DIVIDER
HIGH-Z
MUXOUT
OUTPUT
MUX
CE
TXDATA
DGND
SDOUT
DVDD
RDIV
NDIV
LOCK
DETECT
THIRD-ORDER
FRACTIONAL
INTERPOLATOR
+ PHASE
FREQUENCY
DETECTOR
REFERENCE
SW2
CHARGE
PUMP
CSR
FAST LOCK
SWITCH
CP
SW1
N COUNTER
+
RFINA
RFINB
CLK
DATA
LE
32-BIT
DATA
REGISTER
FRACTION
VALUE
MODULUS
225 VALUE
INTEGER
VALUE
AGND
DGND
SDGND
Figure 1.
CPGND
Rev. B
Document Feedback
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rights of third parties that may result from its 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
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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ADF4159 Datasheet, Funktion
ADF4159
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, GND = AGND = DGND = SDGND = CPGND =
0 V, unless otherwise noted.
Table 4.
Parameter
AVDD to GND
DVDD to GND
VP to GND
VP to AVDD
Digital I/O Voltage to GND
Analog I/O Voltage to GND
REFIN to GND
RFIN to GND
Operating Temperature Range,
Industrial
Storage Temperature Range
Maximum Junction Temperature
Reflow Soldering
Peak Temperature
Time at Peak Temperature
ESD
Charged Device Model
Human Body Model
Rating
−0.3 V to +3.9 V
−0.3 V to +2.4 V
−0.3 V to +3.9 V
−0.3 V to +0.3 V
−0.3 V to DVDD + 0.3 V
−0.3 V to AVDD + 0.3 V
−0.3 V to DVDD + 0.3 V
−0.3 V to AVDD + 0.3 V
−40°C to +125°C
−65°C to +125°C
150°C
260°C
40 sec
1000 V
3000 V
Data Sheet
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
Thermal impedance (θJA) is specified for a device with the
exposed pad soldered to AGND.
Table 5. Thermal Resistance
Package Type
θJA
24-Lead LFCSP_WQ
30.4
Unit
°C/W
ESD CAUTION
Rev. B | Page 6 of 36
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ADF4159 pdf, datenblatt
ADF4159
Data Sheet
REGISTER MAPS
FRAC/INT REGISTER (R0)
MUXOUT
CONTROL
12-BIT INTEGER VALUE (INT)
12-BIT MSB FRACTIONAL VALUE
(FRAC)
CONTROL
BITS
DB31 DB30 DB29 DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
R1 M4 M3 M2 M1 N12 N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1 F25 F24 F23 F22 F21 F20 F19 F18 F17 F16 F15 F14 C3(0) C2(0) C1(0)
RESERVED
LSB FRAC REGISTER (R1)
13-BIT LSB FRACTIONAL VALUE
(FRAC)
DBB
12-BIT PHASE VALUE
DBB
CONTROL
BITS
DB31 DB30 DB29 DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 P1 F13 F12 F11 F10 F9 F8 F7 F6 F5 F4 F3 F2 F1 P12 P11 P10 P9 P8 P7 P6 P5 P4 P3 P2 P1 C3(0) C2(0) C1(1)
RESERVED
DBB
CP
CURRENT
SETTING
R DIVIDER REGISTER (R2)
DBB
5-BIT R COUNTER
12-BIT CLK1 DIVIDER VALUE
DBB
CONTROL
BITS
DB31 DB30 DB29 DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 CR1 CPI4 CPI3 CPI2 CPI1 0 P1 U2 U1 R5 R4 R3 R2 R1 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 C3(0) C2(1) C1(0)
FUNCTION REGISTER (R3)
RESERVED
NEG BLEED
CURRENT
RESERVED
CONTROL
BITS
DB31 DB30 DB29 DB28 DB27 DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 0 0 0 0 NB3 NB2 NB1 0 0 0 0 1 L1 NS1 U12 0 0 RM2 RM1 0 0 U11 U10 U9 U8 U7 C3(0) C2(1) C1(1)
NOTES
1. DBB = DOUBLE-BUFFERED BITS.
Figure 23. Register Summary 1
Rev. B | Page 12 of 36
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