The AD9958 consists of two DDS cores that provide indepen- dent frequency, phase, and amplitude control on each channel. This flexibility can be used to correct imbalances between signals due to analog processing, such as filtering, amplification, or PCB layout related mismatches. Because both channels share a common system clock, they are inherently synchronized. Synchronization of multiple devices is supported.

The AD9958 can perform up to a 16-level modulation of frequency, phase, or amplitude (FSK, PSK, ASK). Modulation is performed by applying data to the profile pins. In addition, the AD9958 also supports linear sweep of frequency, phase, or amplitude for applications such as radar and instrumentation.

The AD9958 serial I/O port offers multiple configurations to provide significant flexibility. The serial I/O port offers an SPI- compatible mode of operation that is virtually identical to the SPI operation found in earlier Analog Devices, Inc., DDS products. Flexibility is provided by four data pins (SDIO_0/ SDIO_1/SDIO_2/SDIO_3) that allow four programmable modes of serial I/O operation.

The AD9958 uses advanced DDS technology that provides low power dissipation with high performance. The device incorporates two integrated, high speed 10-bit DACs with excellent wideband and narrow-band SFDR. Each channel has a dedicated 32-bit frequency tuning word, 14 bits of phase offset, and a 10-bit output scale multiplier.

The DAC outputs are supply referenced and must be termin- ated into AVDD by a resistor or an AVDD center-tapped transformer. Each DAC has its own programmable reference to enable different full-scale currents for each channel.

The DDS acts as a high resolution frequency divider with the REFCLK as the input and the DAC providing the output. The REFCLK input source is common to both channels and can be driven directly or used in combination with an integrated REFCLK multiplier (PLL) up to a maximum of 500 MSPS. The PLL multiplication factor is programmable from 4 to 20, in integer steps. The REFCLK input also features an oscillator circuit to support an external crystal as the REFCLK source. The crystal must be between 20 MHz and 30 MHz. The crystal can be used in combination with the REFCLK multiplier.

The AD9958 comes in a space-saving 56-lead LFCSP package. The DDS core (AVDD and DVDD pins) is powered by a 1.8 V supply. The digital I/O interface (SPI) operates at 3.3 V and requires the pin labeled DVDD_I/O (Pin 49) be connected to 3.3 V.

The AD9958 operates over the industrial temperature range of −40°C to +85°C.

Applications

• Agile L.O. frequency synthesis
• Phased array radar / sonar
• Instrumentation
• Synchronized clocking
• RF source for AOTF
• Single-side band suppressed carriers
• Quadrature communications

Data Sheet, Rev. A, 07/08

Part#	Master fclk	Resolution (Bits)	Tuning Word Width (bits)	Nominal Supply (V)	I Supply total (max)	FS Iout (mA nom)	Compliance Range (V)	REFCLK Multiplier	On-Board Comparator	I/O Interface	Price* (1000-4999)	Product Description
AD9913	250MHz	10	32	Single(+1.8)	63.5mA	4.6	0.8	Yes	No	Parallel, Serial	$9.77	Low power 250 MSPS DDS with 10 bit DAC output
AD9833	25MHz	10	28	Single(+2.3 to +5.5), Single(+2.5), Single(+2.7), Single(+3), Single(+3.3), Single(+3.6), Single(+5)	5.5mA	3	0.65	No	No	Serial	$4.00	25 MHz, Serial Input, Programmable DDS Waveform Generator
AD9831	25MHz	10	32	Single(+3.3), Single(+3.6), Single(+5)	15mA	4	1.5	No	No	Parallel	$6.33	CMOS, 25 MHz Parallel Input DDS with On-Chip 10-Bit DAC & Sine Lookup Table
AD9832	25MHz	10	32	Single(+3.3), Single(+3.6), Single(+5)	15mA	4	1.35	No	No	Serial	$5.06	CMOS, 25 MHz Serial Input DDS with On-Chip 10-Bit DAC & Sine Lookup Table
AD5930	50MHz	10	24	Single(+2.3 to +5.5)	8mA	3.1	0.8	No	No	Serial	$6.38	Programmable Frequency Sweep and Output Burst Waveform Generator
AD5932	50MHz	10	24	Single(+2.3 to +5.5)	8mA	n/a	n/a	Yes	No	Serial	$4.15	Programmable Single-Scan Waveform Generator
AD9830	50MHz	10	32	Single(+5)	60mA	20	1	No	No	Parallel	$11.08	CMOS, 50 MHz Parallel Load DDS with On-Chip 10-Bit DAC & Sine Lookup Table
AD9835	50MHz	10	32	Single(+5)	40mA	4	1.35	No	No	Serial	$5.82	CMOS, Serial Input, 50 MHz DDS with On-Chip 10-Bit DAC
AD9834	75MHz	10	28	Single(+2.3 to +5.5), Single(+2.5), Single(+2.7), Single(+3), Single(+3.3), Single(+3.6), Single(+5)	8.7mA	3	0.8	No	Yes	Serial	$5.01	Low Power, 50 MHz Serial Input DDS With On-Board Comparator
AD9850	125MHz	10	32	Single(+3.3), Single(+5)	96mA	20	1.5	No	Yes	Parallel, Serial	$12.14	CMOS, 125 MHz Serial/Byte-Parallel Input, Complete DDS
AD9851	180MHz	10	32	Single(+3), Single(+3.3), Single(+3.6), Single(+5)	130mA	20	1.5	Yes	Yes	Parallel, Serial	$13.56	180 MHz Complete DDS
AD9852	300MHz	12	48	Single(+3.3)	922mA	20	1	Yes	Yes	Parallel, Serial	$15.58	CMOS, 300 MSPS Complete DDS w/ Clock Multiplier
AD9854	300MHz	12	48	Single(+3.3)	1210mA	10	1	Yes	Yes	Parallel, Serial	$17.10	CMOS 300 MHz, Quadrature, Complete-DDS
AD9859	400MHz	10	32	Multi(+1.8, +3.3)	n/a	20	2.05	Yes	No	Serial	$9.87	400 MSPS, 10-Bit, 1.8 V CMOS DDS
AD9951	400MHz	14	32	Multi(+1.8, +3.3), Single(+1.8)	n/a	10	2.05	Yes	No	Serial	$13.90	400 MSPS 14-Bit, 1.8 V CMOS DDS
AD9952	400MHz	14	32	Multi(+1.8, +3.3), Single(+1.8)	n/a	10	2.05	Yes	Yes	Serial	$15.68	400 MSPS, 14-Bit, 1.8 V, CMOS Direct Digital Synthesizer w/High Speed Comparator
AD9953	400MHz	14	32	Multi(+1.8, +3.3), Single(+1.8)	n/a	10	2.05	Yes	No	Serial	$14.92	400 MSPS, 14-Bit DAC, 1.8 V CMOS Direct Digital Synthesizer w/ 1024x32 RAM
AD9954	400MHz	14	32	Multi(+1.8, +3.3), Single(+1.8)	n/a	10	2.05	Yes	Yes	Serial	$17.45	400 MSPS, 14-Bit, 1.8V CMOS DDS w/ 1024x32 RAM, Linear Sweep Block, & Hi Speed Comparator
AD9956	400MHz	14	48	Multi(+1.8, +3.3)	n/a	10	2.3	No	No	Serial	$17.45	400 MSPS, 14-Bit DAC, 48-Bit Freq Tuning Word, 1.8 V CMOS DDS Based AgileRF™ Synthesizer
AD9958	500MHz	10	32	Multi(+1.8, +3.3)	105mA	10	2.3	Yes	-	Serial	$20.48	2-Channel 500 MSPS DDS with 10-Bit DACs
AD9911	500MHz	10	32	Single(+1.8)	73mA	10	1.8	Yes	-	Serial	$15.69	500 MSPS Direct Digital Synthesizer w/10-Bit DAC
AD9959	500MHz	10	32	Multi(+1.8, +3.3)	180mA	10	2.3	Yes	-	Serial	$37.59	-
AD9858	1000MHz	10	32	Multi(+3.3, +5)	n/a	40	3.8	No	No	Parallel, Serial	$45.66	1 GSPS Direct Digital Synthesizer
AD9910	1000MHz	14	32	Single(+1.8), Single(+3.3)	n/a	20	0.5	Yes	No	Parallel, Serial	$35.33	1 GSPS, 14-Bit, 3.3 V CMOS Direct Digital Synthesizer
AD9912	1000MHz	14	48	Multi(+1.8, +3.3)	394mA	-	0.5	Yes	Yes	Serial	$37.70	1 GSPS 14-Bit, DDS with Spur Reduction Channels

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
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