AD9956 Datasheet PDF - Analog Devices

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AD9956
Analog Devices

Part Number AD9956
Description 2.7 GHz DDS-Based AgileRF
Page 30 Pages

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2.7 GHz DDS-Based AgileRFTM Synthesizer
AD9956
FEATURES
400 MSPS internal DDS clock speed
48-bit frequency tuning word
14-bit programmable phase offset
Integrated 14-bit DAC
Excellent dynamic performance
Phase noise ≤ 135 dBc/Hz @ 1 KHz offset
−80 dB SFDR @ 160 MHz (±100 KHz offset IOUT)
25 Mb/s write-speed serial I/O control
200 MHz phase frequency detector inputs
655 MHz programmable input dividers for the phase
frequency detector (÷M, ÷N) {M, N = 1..16} (bypassable)
Programmable RF divider (÷R) {R = 1, 2, 4, 8} (bypassable)
8 phase/frequency profiles
1.8 V supply for device operation
3.3 V supply for I/O and charge pump
Software controlled power-down
48-lead LFCSP package
Automatic linear frequency sweeping capability (in DDS)
Programmable charge pump current (up to 4 mA)
Phase modulation capability
Multichip synchronization
Dual-mode PLL lock detect
655 MHz CML-mode PECL-compliant driver
APPLICATIONS
Agile LO frequency synthesis
FM chirp source for radar and scanning systems
Automotive radars
Test and measurement equipment
Acousto-optic device drivers
FUNCTIONAL BLOCK DIAGRAM
DAC_RSET
DELTA
FREQUENCY
TUNING WORD
FREQUENCY
ACCUMULATOR
PLL_LOCK/SYNC_IN
I/O_UPDATE
DELTA
FREQUENCY
24 RAMP RATE
16
48 PHASE
OFFSET
19
FTW
48
PHASE
ACCUMULATOR
PHASE
OFFSET
WORD
14
DDS CORE
PHASE TO
AMPLITUDE
CONVERSION
SYSCLK
TIMING AND CONTROL LOGIC
14
DAC
SYSCLK
IOUT
IOUT
I/O_RESET
SYNC_OUT
REFCLK
REFCLK
SYNC_CLK
RF-DIVIDER
÷R
CML CLOCK DRIVER
SYSCLK
÷4
3
OSCILLATOR
BUFFER
LOCK
DETECT
÷M
Φ
÷N
CHARGE
PUMP
SCALER
3
CHARGE
PUMP
CP_OUT
FROM PLLOSC
BUFFER
DRV DRV DRV_RSET
PS<2:0> RESET I/O PORT PLLREF/ PLLOSC/
PLLREF PLLOSC
Figure 1.
CP_RSET
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.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks 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
www.analog.com
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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