a
FEATURES
200 MHz Bandwidth
2.7 V to 5.5 V Power Supply
Separate Charge Pump Supply (V
P
) Allows Extended
Tuning Voltage in 5 V Systems
Programmable Charge Pump Currents
3-Wire Serial Interface
Hardware and Software Power-Down Mode
Analog and Digital Lock Detect
Hardware-Compatible to the ADF4110/ADF4111/
ADF4112/ADF4113
Typical Operating Current 4.5 mA
Ultralow Phase Noise
16-Lead TSSOP
20-Lead Chip Scale Package
APPLICATIONS
Clock Generation
Low Frequency PLLs
Low Jitter Clock Source
Clock Smoothing
Frequency Translation
SONET, ATM, ADM, DSLAM, SDM
200 MHz Clock Generator PLL
ADF4001
GENERAL DESCRIPTION
The ADF4001 clock generator can be used to implement clock
sources for PLLs that require very low noise, stable refer-
ence signals. It consists of a low-noise digital PFD (Phase
Frequency Detector), a precision charge pump, a programmable
reference divider, and a programmable 13-bit N counter. In
addition, the 14-bit reference counter (R Counter) allows
selectable REFIN frequencies at the PFD input. A complete
PLL (Phase-Locked Loop) can be implemented if the synthesizer
is used with an external loop filter and VCO (Voltage Controlled
Oscillator) or VCXO (Voltage Controlled Crystal Oscillator).
The N min value of 1 allows flexibility in clock generation.
FUNCTIONAL BLOCK DIAGRAM
AV
DD
DV
DD
V
P
CPGND
R
SET
ADF4001
REF
IN
14-BIT
R COUNTER
14
R COUNTER
LATCH
CLK
DATA
LE
SD
OUT
24-BIT
INPUT REGISTER
22
FUNCTION
LATCH
LOCK DETECT
REFERENCE
PHASE
FREQUENCY
DETECTOR
CHARGE
PUMP
CP
CURRENT
SETTING 1
CURRENT
SETTING 2
CPI3 CPI2
CPI1 CPI6 CPI5
CPI4
N COUNTER
LATCH
13
AV
DD
MUX
13-BIT
N COUNTER
SD
OUT
HIGH Z
MUXOUT
RF
IN
A
RF
IN
B
M3
CE
AGND
DGND
M2
M1
REV. 0
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 rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
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