2-Channel 500 MSPS DDS
with 10-Bit DACs
AD9958
FEATURES
2 synchronized DDS channels @ 500 MSPS
Independent frequency/phase/amplitude control between
channels
Matched latencies for frequency/phase/amplitude changes
Excellent channel-to-channel isolation (>72 dB)
Linear frequency/phase/amplitude sweeping capability
Up to 16 levels of frequency/phase/amplitude modulation
(pin-selectable)
2 integrated 10-bit D/A converters (DACs)
Individually programmable DAC full-scale currents
32-bit frequency tuning resolution
14-bit phase offset resolution
10-bit output amplitude scaling resolution
Serial I/O Port (SPI) with 800Mbps data throughput
Software-/hardware-controlled power-down
Dual supply operation (1.8 V DDS core/3.3 V serial I/O)
Multiple device synchronization
Selectable 4× to 20× REF_CLK multiplier (PLL)
Selectable REF_CLK crystal oscillator
56-Lead LFCSP
APPLICATIONS
Agile local oscillator
Phased array radar/sonar
Instrumentation
Synchronized clocking
RF source for AOTF
Single-side band suppressed carrier
Quadrature communications
FUNCTIONAL BLOCK DIAGRAM
AD9958
32
Σ
32
Σ
Σ
DDS CORE
15
COS(X)
IOUT
10
10
DAC
IOUT
DDS CORE
32
Σ
32
Σ
Σ
15
COS(X)
IOUT
10
10
DAC
IOUT
∆FTW
SYNC_IN
SYNC_OUT
I/O_UPDATE
÷4
FTW
32
PHASE/
∆PHASE
14
AMP/
∆AMP
10
SCALABLE
DAC REF
CURRENT
DAC_RSET
TIMING AND CONTROL LOGIC
SYSTEM
CLK
PWR_DWN_CTL
MASTER_RESET
SCLK
CS
SDIO_0
SDIO_1
SDIO_2
SDIO_3
05252-001
SYNC_CLK
REF_CLK
REF_CLK
CONTROL
REGISTERS
CHANNEL
REGISTERS
BUFFER/
XTAL
OSCILLATOR
REF CLOCK
MULTIPLIER
4× TO 20×
MUX
I/O
PORT
BUFFER
PROFILE
REGISTERS
1.8V
1.8V
DVDD
PS0 PS1 PS2 PS3
DVDD_I/O
CLK_MODE_SEL
AVDD
Figure 1.
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.
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www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
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